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Electric Vehicles: Benefits, Challenges, and Potential Solutions for Widespread Adaptation

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The world’s primary modes of transportation are facing two major problems: rising oil costs and increasing carbon emissions. As a result, electric vehicles (EVs) are gaining popularity as they are independent of oil and do not produce greenhouse gases. However, despite their benefits, several operational issues still need to be addressed for EV adoption to become widespread. This research delves into the evolution of EVs over time and highlights their benefits, including reducing carbon emissions and air pollution. It also explores the challenges and difficulties faced in their adoption, such as the high cost of infrastructure, scarcity of charging stations, limited range or range anxiety, and the performance of batteries. To overcome these challenges, potential solutions include enhancing the charging infrastructure, increasing the number of charging stations, using battery swapping techniques, and improving battery technology to address range anxiety and reduce charging times. Governments can incentivize consumers to purchase EVs through tax credits or subsidies and invest in building a robust charging infrastructure. Industry stakeholders can collaborate with governments to address these challenges and promote the adoption of EVs, which can contribute to reducing carbon emissions and air pollution.
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Citation: Alanazi, F. Electric Vehicles:
Benefits, Challenges, and Potential
Solutions for Widespread Adaptation.
Appl. Sci. 2023,13, 6016. https://
doi.org/10.3390/app13106016
Academic Editors: Arman Goudarzi,
Muhammad Waseem and
Shah Fahad
Received: 22 April 2023
Revised: 10 May 2023
Accepted: 11 May 2023
Published: 13 May 2023
Copyright: © 2023 by the author.
Licensee MDPI, Basel, Switzerland.
This article is an open access article
distributed under the terms and
conditions of the Creative Commons
Attribution (CC BY) license (https://
creativecommons.org/licenses/by/
4.0/).
applied
sciences
Article
Electric Vehicles: Benefits, Challenges, and Potential Solutions
for Widespread Adaptation
Fayez Alanazi
Civil Engineering Department, College of Engineering, Jouf University, Sakaka 72388, Saudi Arabia;
fkalanazi@ju.edu.sa
Abstract:
The world’s primary modes of transportation are facing two major problems: rising oil costs
and increasing carbon emissions. As a result, electric vehicles (EVs) are gaining popularity as they
are independent of oil and do not produce greenhouse gases. However, despite their benefits, several
operational issues still need to be addressed for EV adoption to become widespread. This research
delves into the evolution of EVs over time and highlights their benefits, including reducing carbon
emissions and air pollution. It also explores the challenges and difficulties faced in their adoption,
such as the high cost of infrastructure, scarcity of charging stations, limited range or range anxiety,
and the performance of batteries. To overcome these challenges, potential solutions include enhancing
the charging infrastructure, increasing the number of charging stations, using battery swapping
techniques, and improving battery technology to address range anxiety and reduce charging times.
Governments can incentivize consumers to purchase EVs through tax credits or subsidies and invest
in building a robust charging infrastructure. Industry stakeholders can collaborate with governments
to address these challenges and promote the adoption of EVs, which can contribute to reducing
carbon emissions and air pollution.
Keywords: electric vehicles; smart cities; challenges; charging infrastructure
1. Introduction
The automobile industry has become a major player in both the global economy
and the world of Research and Development (R&D). With the constant advancement of
technology, vehicles are now equipped with features that prioritize the safety of both
passengers and pedestrians [
1
]. This has led to an increase in the number of vehicles on
the road, providing us with the convenience of quick and comfortable travel. However,
this progress has come at a cost. Urban areas have seen a sharp rise in environmental
contaminants such as sulfur dioxide (SO
2
), nitrogen oxides (NOX), carbon monoxide
(CO), and particulate matter (PM) [
2
]. It is important to acknowledge the impact that the
automobile industry has had on our daily lives, both positive and negative. While industry
has brought about significant advancements in technology and transportation, it has also
contributed to the deterioration of our environment. As we continue to move forward, we
must prioritize finding solutions to mitigate the negative effects of the automobile industry
on our planet.
It is commonly acknowledged that the earth faces growing hazards from carbon
emissions and the availability of oil. Regarding energy users, the transport industry
has the largest overall environmental effect, contributing more than 25% of the world’s
energy usage and greenhouse gas emissions. Road transport accounts for over 70% of
the sector’s emissions [
3
,
4
]. To find answers to the problems of dependency on oil and
emissions reduction, the concept of “sustainable transportation” has been promoted [
5
].
The Electric Power Research Institute (EPRI) claims that even in contrast to more efficient
conventional vehicles, the widespread use of EVs would considerably reduce greenhouse
gas emissions [
6
]. Additionally, EVs on “tank to-wheels” often have an efficiency three
Appl. Sci. 2023,13, 6016. https://doi.org/10.3390/app13106016 https://www.mdpi.com/journal/applsci
Appl. Sci. 2023,13, 6016 2 of 23
times greater than those powered by internal combustion engines. (ICVs). Additionally,
noise and vibration are reduced with electric automobiles [79].
Due to its benefits and the immediate need to tackle climate change and energy
stability, several nations are promoting EVs. More than 275,000 plug-in electric vehicles
(PEVs) are currently on the road countrywide in the United States, a considerable increase
in PEV deployment since 2011 [
10
,
11
]. Since the introduction of EVs to the market in 2010,
their sales have quadrupled annually in Europe, and by 2013, approximately 60,000 PEVs
had been sold. As of September 2021, more than 2 million electric vehicles had been sold in
Europe [
12
]. China, the fastest-growing country in terms of EVs, has set a target of having
electric vehicles (EVs) account for 20% of total new car sales by 2025. The government has
also set a longer-term target of having all new cars sold in China be “new energy” vehicles
(NEVs), which include both pure electric and plug-in hybrid cars, by 2035 [13].
Nevertheless, despite this marketing approach and the numerous advantages of EVs,
their market share in terms of overall sales is still tiny, with EVs accounting for only 14% of
all passenger cars purchased globally [
14
]. One of several obstacles that must be removed
for EVs to become widely used is their undeveloped battery technology. EVs are less
appealing to the typical customer because of their limited range, lengthy charging periods,
and expensive upfront prices [
15
]. The limited availability of charging infrastructure is
another significant obstacle to the widespread adoption of EVs [
16
]. Establishing EV
infrastructure is challenging because of the well-known “chicken-and-egg problem”. Many
drivers won’t pick EVs unless a significant infrastructure for charging them is established.
But if there aren’t enough EVs on the road, it’s highly doubtful that charging service
providers would make significant investments in infrastructure development [9].
High-quality services are urgently required to resolve these challenging problems,
specifically to enable EVs to capture the market, and states will, of course, do a crucial job in
establishing the EV industry [
17
]. Recent studies have focused on various service operations
issues that are considered important in driving the growth of the EV industry. For instance,
how innovative business models might succeed long-term, how governments should
encourage the EV market through incentive programs, and how charging infrastructures
can be built to satisfy consumer needs while minimizing social costs [18,19].
However, the massive increase in the use of electric cars has brought up several
difficulties, issues, uncertainties, and concerns, including the high cost of infrastructure, the
price of electric vehicles, the scarcity of charging stations, and the limited range of electric
vehicles. Batteries continue to be the most significant issue. In the subsequent years, EVs
will be a considerable component of smart cities, along with interconnected transportation,
public transit, and other elements. Therefore, more effort is needed to improve batteries
and simplify the charging process. The main problem with EVs is their autonomy. Scientists
are developing better battery technology to increase driving range while reducing weight,
cost, and charging time. These factors will eventually determine the direction of EVs. The
critical hazards and difficulties related to using electric cars in smart cities are covered in
this study, along with solutions to these issues.
1.1. Research Motivations
The following is the fundamental motivation behind this research work:
1.
Challenges and difficulties in electric vehicle adoption: Adopting electric vehicles has
challenges and problems. One of the most significant challenges is infrastructure and
electric vehicles’ high cost. The price of electric vehicles is often higher than that of
their gasoline counterparts, making them less accessible to consumers. Moreover, the
scarcity of charging stations is a significant issue that needs to be addressed, especially
in regions with low population densities. Additionally, the limited range of electric
vehicles, or range anxiety, is a significant obstacle to their widespread adoption.
2.
The battery issue: The performance of batteries continues to be a major issue for
electric vehicles. Batteries are expensive, heavy, and require frequent charging, which
makes them less practical for daily use. Scientists are actively developing better
Appl. Sci. 2023,13, 6016 3 of 23
battery technology to address these issues, including increasing driving range, weight
reduction, cost reduction, and charging time. Battery technology will ultimately
determine the success or failure of electric vehicles on the market.
3.
Integration of electric vehicles into smart cities: Electric vehicles are expected to play a
vital role in the transportation systems of smart cities. However, their integration into
these cities requires a collaborative effort between governments, industry stakeholders,
and citizens. This includes developing charging infrastructure, promoting renewable
energy sources, and encouraging public transportation.
1.2. Research Goal
The primary objective of this study is to shed light on the challenges surrounding the
adoption of electric vehicles and suggest effective strategies for their successful implemen-
tation. To achieve this goal, we have employed a mixed-methods research approach, which
involves gathering and analyzing both qualitative and quantitative data and synthesizing
the results to draw meaningful conclusions.
In the context of this work, a mixed-methods approach is particularly advantageous
for exploring the intricate and multifaceted issue of electric vehicle adoption and imple-
mentation. By combining both qualitative and quantitative data, this approach can provide
a more comprehensive and nuanced understanding of the obstacles and opportunities
associated with electric vehicle adoption and implementation. The aim is to investigate
electric vehicle adoption and implementation by providing evidence-based insights and
recommendations. The study represents a significant step towards understanding the
challenges and opportunities associated with electric vehicle adoption and implementation.
By using a mixed-methods approach, we have been able to provide a more comprehensive
and nuanced understanding of this complex issue. Table 1shows some research questions
to help concentrate on the study and properly address the goals.
Table 1. Research Questions.
Research Questions
RQ1: What are the main challenges and facilitators of electric vehicle implementation in smart
cities, and what collaborative efforts are necessary for successful integration?
RQ2: How have electric vehicles contributed to reducing carbon emissions, and what is their
global market share trend over time?
RQ3: What are the potential future research directions for electric vehicles in smart cities, with a
focus on improving battery technology, addressing range anxiety, reducing charging times, and
promoting EV adoption?
2. Background
2.1. Smart City
A smart city is a settled region employing multiple technology devices and sensors
to collect data. Smart cities manage public resources to enhance the quality of services
while putting comfort, maintenance, and sustainability first by using information and
communication technology (ICT) [20].
EVs, which include electric cars, electric buses, and neighborhood electric vehicles,
will soon dominate the transportation industry. The whole transit system will be electrified
within the general trend of lowering petrol emissions in the city [
21
,
22
]. However, the
effectiveness of these new transportation systems cannot be assured in a typical metropolis
due to new issues in power distribution and traffic management. Consequently, a smart
city can aid in realizing this national goal [23].
Electric vehicles are a crucial part of many smart city programs; hence, smart cities
and electric automobiles are closely connected [
24
]. One of the main objectives of many
smart city initiatives is to drastically cut emissions and enhance the air quality in urban
areas through the widespread use of electric cars. Electric vehicles, which require less
maintenance and have lower operating expenses than conventional vehicles, also help
Appl. Sci. 2023,13, 6016 4 of 23
smart cities become more efficient. Additionally, infrastructure designed for smart cities,
such as smart traffic control systems and charging stations, can facilitate the adoption and
integration of electric vehicles [25].
Nevertheless, integrating electric cars into smart cities is not without its difficulties.
The expense of electric cars and the infrastructure for charging them, which may be
expensive and need a substantial investment, is one of the key problems. Additionally,
some locals may worry about running out of energy due to the short range of electric
vehicles. Guarantee that the infrastructure for charging matches residents’ demands;
this necessitates thorough planning and supervision. To guarantee that electric cars are
successfully and efficiently integrated into smart city infrastructure, another difficulty is the
requirement for coordination and collaboration between several stakeholders, including
the government, companies, and people [23,26].
Urban areas might become more effective, sustainable, and livable because of the
development of smart cities [
25
]. However, cities must solve the implementation issues to
ensure efficiency and equity. Cities can successfully implement smart city initiatives and
reap their advantages by investing in technology and data management, creating strict
privacy and cybersecurity policies and protocols, working effectively with stakeholders,
and creating inclusive and accessible initiatives [27,28].
2.2. Intelligent Transportation Systems Overview
An Intelligent Transportation System (ITS) that can accommodate their transportation
needs is necessary for smart cities. For better public transportation services, transportation
in a smart city should be hassle-free, environmentally friendly, and comprise networked and
shared vehicles. The electric vehicle (EV), which also solves the world’s energy problems,
is the finest option. Autonomous electric vehicles (AEVs), or intelligent electric vehicles,
offer the linked and shared layer needed for a smart city [29,30].
New guidelines for limiting carbon emissions (CEs) in the transit industry have been
recommended, considering the rise of smart cities. Intelligent transportation systems (ITS)
resolve the issues of traffic congestion and carbon emissions brought on by the sharp rise
in the number of cars. (ITS). The main subject of the study is the impact of ITS installation
on transportation networks’ ability to save energy and reduce emissions (ECER) [
31
].
Traditional transportation infrastructure is combined with advancements in information
technology, communications, sensors, controls, and sophisticated mathematical techniques
to create ITS. Over the past few decades, ITS has been created and deployed to increase
productivity, lower carbon emissions, enhance sustainable transportation, and increase
mobility and traffic safety [32,33].
Various factors, including an inappropriately designed urban road network, prob-
lematic functional and structural components of the road system, a lack of facilities for
traffic management, and poor management levels, lead the total volume of urban traffic
in different nations to deviate significantly from the optimum state. Urban traffic conges-
tion issues, repeated traffic accidents, and increased noise and air pollution are all results
of urbanization’s rapid acceleration and growth in the number of cars. These problems
have significantly negatively influenced urban traffic’s transport capacity and operational
effectiveness. Cities have begun to actively develop ITSs actively in response to these
conditions [31,32].
2.3. Electric Vehicles
Due to their potential to lower greenhouse gas emissions and reliance on fossil fuels,
electric vehicles (EVs) are a growingly well-liked form of transportation that has recently
attracted much attention. Instead of using petrol or diesel fuel, an electric vehicle is
propelled by an electric motor that draws power from rechargeable batteries. Three times
as many electric vehicle (EV) users are anticipated by 2030 compared with 2011. This
results from high-tech advancements in battery performance and how they affect vehicle
autonomy [34].
Appl. Sci. 2023,13, 6016 5 of 23
The environmental effect of electric cars is one of their main benefits. Figure 1shows
the energy-related carbon dioxide emissions in the US, China, and Europe from 1983 to
2023. While the sales of electric vehicles have been increasing in both China and the US,
it is essential to note that these countries also have many traditional fossil-fuel-powered
vehicles on the road. Additionally, the growth in energy demand in these countries has led
to increased coal use, the primary source of carbon dioxide emissions [5,35].
Appl. Sci. 2023, 13, 6016 6 of 25
2.3. Electric Vehicles
Due to their potential to lower greenhouse gas emissions and reliance on fossil fuels,
electric vehicles (EVs) are a growingly well-liked form of transportation that has recently
aracted much aention. Instead of using petrol or diesel fuel, an electric vehicle is
propelled by an electric motor that draws power from rechargeable baeries. Three times
as many electric vehicle (EV) users are anticipated by 2030 compared with 2011. This
results from high-tech advancements in baery performance and how they aect vehicle
autonomy [34].
The environmental eect of electric cars is one of their main benets. Figure 1 shows
the energy-related carbon dioxide emissions in the US, China, and Europe from 1983 to
2023. While the sales of electric vehicles have been increasing in both China and the US, it
is essential to note that these countries also have many traditional fossil-fuel-powered
vehicles on the road. Additionally, the growth in energy demand in these countries has
led to increased coal use, the primary source of carbon dioxide emissions [5,35].
Figure 1. Energy-related carbon dioxide emissions in the US, China, and Europe from 1983 to 2023
[36].
Despite this, electric vehicles are still expected to signicantly reduce carbon dioxide
emissions in these countries in the long term. Unlike traditional cars, EVs don’t have
tailpipe emissions. Even when the electricity they use is produced from fossil fuels, they
still create less pollution than cars that run on gasoline. Because of this, EVs are a desirable
alternative for those concerned about lowering their carbon impact. Electric cars come in
various forms, such as baery electric vehicles (BEVs) and plug-in hybrid electric vehicles.
(PHEVs). While PHEVs feature a baery and a conventional petrol or diesel engine, BEVs
are powered by baeries. PHEVs can go a certain distance on electric power alone before
the petrol engine takes over [37]. Electric vehicles have advantages over conventional cars
regarding cost-eectiveness and the environment. EVs might cost more up front, but they
can save drivers money over time thanks to reduced fuel prices and less frequent
maintenance needs. Since electric motors have fewer moving parts and require less
maintenance, EVs also often have longer lifespans than conventional cars [38]. Therefore,
it’s a must to implement electric vehicles all over the world by reducing their adoption
challenges.
In this regard, government incentives play a critical role in increasing the sales of
electric vehicles by making them more aordable and accessible to the public [17]. China
is a prime example of this, as the government has implemented various policies and
incentives to encourage the adoption of electric vehicles. These include nancial incentives
4563 5139 5450 5789 6190 5907 5259 5269 5315
2273 2830 3388 4024 4652
6816
9492
10,877 11,649
3089 3189 3279 3310 3356 3237 3014 2763 2587
1983 1988 1993 1998 2003 2008 2013 2018 2023
Carbon Dioxide emissions
(million metric tons)
Year
United States (million metric tons) China (million metric tons)
Europe (million metric tons)
Figure 1.
Energy-related carbon dioxide emissions in the US, China, and Europe from 1983 to
2023 [36].
Despite this, electric vehicles are still expected to significantly reduce carbon dioxide
emissions in these countries in the long term. Unlike traditional cars, EVs don’t have
tailpipe emissions. Even when the electricity they use is produced from fossil fuels, they
still create less pollution than cars that run on gasoline. Because of this, EVs are a desirable
alternative for those concerned about lowering their carbon impact. Electric cars come
in various forms, such as battery electric vehicles (BEVs) and plug-in hybrid electric
vehicles. (PHEVs). While PHEVs feature a battery and a conventional petrol or diesel
engine, BEVs are powered by batteries. PHEVs can go a certain distance on electric power
alone before the petrol engine takes over [
37
]. Electric vehicles have advantages over
conventional cars regarding cost-effectiveness and the environment. EVs might cost more
up front, but they can save drivers money over time thanks to reduced fuel prices and
less frequent maintenance needs. Since electric motors have fewer moving parts and
require less maintenance, EVs also often have longer lifespans than conventional cars [
38
].
Therefore, it’s a must to implement electric vehicles all over the world by reducing their
adoption challenges.
In this regard, government incentives play a critical role in increasing the sales of
electric vehicles by making them more affordable and accessible to the public [
17
]. China
is a prime example of this, as the government has implemented various policies and
incentives to encourage the adoption of electric vehicles. These include financial incentives
such as subsidies, tax breaks, and free license plates, as well as non-financial incentives
such as preferential access to carpool lanes and free parking [
39
41
]. These incentives
have helped to reduce the upfront cost of electric vehicles, making them more competitive
with traditional gasoline-powered cars. In addition, government investments in charging
infrastructure and research and development have helped to address concerns around range
anxiety and the technology’s reliability. These incentives have resulted in a surge in electric
Appl. Sci. 2023,13, 6016 6 of 23
vehicle sales in China, making it the largest market for electric vehicles globally [
39
,
42
].
Figure 2depicts the global electric car stock country-wise, including battery electric vehicles
(BEVs) and plug-in hybrid electric vehicles (PHEVs). China also holds the largest number
of public EV charging stations, as shown in Figure 3.
Appl. Sci. 2023, 13, 6016 6 of 24
such as preferential access to carpool lanes and free parking [39–41]. These incentives have
helped to reduce the upfront cost of electric vehicles, making them more competitive with
traditional gasoline-powered cars. In addition, government investments in charging in-
frastructure and research and development have helped to address concerns around
range anxiety and the technology’s reliability. These incentives have resulted in a surge in
electric vehicle sales in China, making it the largest market for electric vehicles globally
[39,42]. Figure 2 depicts the global electric car stock country-wise, including baery elec-
tric vehicles (BEVs) and plug-in hybrid electric vehicles (PHEVs). China also holds the
largest number of public EV charging stations, as shown in Figure 3.
Figure 2. Global electric car stock country-wise, including both baery electric vehicles (BEVs) and
plug-in hybrid electric vehicles (PHEVs) [3].
It’s worth noting that these gures are constantly evolving as governments and pri-
vate companies continue to invest in expanding their EV charging infrastructure. China
has been particularly aggressive in building its charging network, intending to have 4.8
million charging points by 2025 [43]. Europe also invests heavily in expanding its charging
infrastructure, with plans to have 1 million public charging points by 2025. The US is
somewhat behind in the number of charging stations, but the Biden administration has
proposed signicant funding to help build the country’s EV charging network.
Figure 3. Public EV charging stations [43].
0
5
10
15
20
25
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
EVs Stock (in millions)
Years
China Europe United States Others
1,385,000
253,000
106,000
0
200,000
400,000
600,000
800,000
1,000,000
1,200,000
1,400,000
1,600,000
China Europe United States
Figure 2.
Global electric car stock country-wise, including both battery electric vehicles (BEVs) and
plug-in hybrid electric vehicles (PHEVs) [3].
Appl. Sci. 2023, 13, 6016 6 of 24
such as preferential access to carpool lanes and free parking [39–41]. These incentives have
helped to reduce the upfront cost of electric vehicles, making them more competitive with
traditional gasoline-powered cars. In addition, government investments in charging in-
frastructure and research and development have helped to address concerns around
range anxiety and the technology’s reliability. These incentives have resulted in a surge in
electric vehicle sales in China, making it the largest market for electric vehicles globally
[39,42]. Figure 2 depicts the global electric car stock country-wise, including baery elec-
tric vehicles (BEVs) and plug-in hybrid electric vehicles (PHEVs). China also holds the
largest number of public EV charging stations, as shown in Figure 3.
Figure 2. Global electric car stock country-wise, including both baery electric vehicles (BEVs) and
plug-in hybrid electric vehicles (PHEVs) [3].
It’s worth noting that these gures are constantly evolving as governments and pri-
vate companies continue to invest in expanding their EV charging infrastructure. China
has been particularly aggressive in building its charging network, intending to have 4.8
million charging points by 2025 [43]. Europe also invests heavily in expanding its charging
infrastructure, with plans to have 1 million public charging points by 2025. The US is
somewhat behind in the number of charging stations, but the Biden administration has
proposed signicant funding to help build the country’s EV charging network.
Figure 3. Public EV charging stations [43].
0
5
10
15
20
25
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
EVs Stock (in millions)
Years
China Europe United States Others
1,385,000
253,000
106,000
0
200,000
400,000
600,000
800,000
1,000,000
1,200,000
1,400,000
1,600,000
China Europe United States
Figure 3. Public EV charging stations [43].
It’s worth noting that these figures are constantly evolving as governments and private
companies continue to invest in expanding their EV charging infrastructure. China has
been particularly aggressive in building its charging network, intending to have
4.8 million
charging points by 2025 [
43
]. Europe also invests heavily in expanding its charging infras-
tructure, with plans to have 1 million public charging points by 2025. The US is somewhat
behind in the number of charging stations, but the Biden administration has proposed
significant funding to help build the country’s EV charging network.
The classification and some of the advantages EVs offer over traditional vehicles are
as follows:
Appl. Sci. 2023,13, 6016 7 of 23
2.3.1. Classification of Electric Vehicles
Vehicles that operate on electricity rather than petrol or diesel fuel are known as electric
vehicles (EVs). There are several EV kinds, each with a unique engine and settings [
44
].
According to their engine technology and settings, electric cars are categorized in the
following manner in detail (Figure 4):
Appl. Sci. 2023, 13, 6016 7 of 24
The classication and some of the advantages EVs oer over traditional vehicles are
as follows:
2.3.1. Classication of Electric Vehicles
Vehicles that operate on electricity rather than petrol or diesel fuel are known as elec-
tric vehicles (EVs). There are several EV kinds, each with a unique engine and seings
[44]. According to their engine technology and seings, electric cars are categorized in the
following manner in detail (Figure 4):
Figure 4. Classication of Electric Vehicles (EVs) according to engine technology and seings.
Baery Electric Vehicles (BEVs)
Baery Electric vehicles (BEVs): Rechargeable baeries are the only power source for
BEVs, which are electric automobiles. They don’t have a backup generator or a petrol en-
gine. Due to their lack of exhaust emissions, BEVs are regarded as the most ecologically
benecial form of electric car. However, they have a constrained driving range because
the baery must be recharged [45].
Hybrid Electric Vehicles (HEVs)
Hybrid Electric Vehicles (HEVs): HEVs are electric cars with petrol engines and elec-
tric motors. An electric motor propels the car at low speeds and during acceleration. The
petrol engine takes over at higher speeds and when greater power is required. Because
HEVs utilize regenerative braking to recharge their baeries, they do not require plugging
in. Although they use less fuel than conventional petrol cars, they have some exhaust
emissions [45].
Plug in Hybrid Electric Vehicles (PHEVs)
Hybrid electric vehicles (HEVs) with bigger baeries that can be recharged by plug-
ging a charging cable into an external electric power source in addition to internally by
their on-board internal combustion engine-powered generator are called plug-in hybrid
electric vehicles (PHEVs). They have a nite range of operations on electric power before
switching to the petrol engine. PHEVs provide the ease of daily driving without a plug
while allowing for electricity usage or on short journeys [46].
Fuel cell electric vehicles (FCEVs)
Fuel cell electric vehicles (FCEVs): FCEVs react hydrogen gas with oxygen in the air
to create power. They don’t have a baery, and their sole waste is water vapor. Although
FCEVs can be refueled in a few minutes and have a greater driving range than BEVs, there
is still a lack of hydrogen refueling infrastructure [47].
Extended Range Electric Vehicles (ER-EVs)
Extended Range Electric Vehicles (ER-EVs) are a type of electric vehicle that combines
the features of a Baery Electric Vehicle (BEV) and a Plug-in Hybrid Electric Vehicle
(PHEV). ER-EVs have a larger baery pack than PHEVs, which allows them to travel
Figure 4. Classification of Electric Vehicles (EVs) according to engine technology and settings.
Battery Electric Vehicles (BEVs)
Battery Electric vehicles (BEVs): Rechargeable batteries are the only power source
for BEVs, which are electric automobiles. They don’t have a backup generator or a petrol
engine. Due to their lack of exhaust emissions, BEVs are regarded as the most ecologically
beneficial form of electric car. However, they have a constrained driving range because the
battery must be recharged [45].
Hybrid Electric Vehicles (HEVs)
Hybrid Electric Vehicles (HEVs): HEVs are electric cars with petrol engines and
electric motors. An electric motor propels the car at low speeds and during acceleration.
The petrol engine takes over at higher speeds and when greater power is required. Because
HEVs utilize regenerative braking to recharge their batteries, they do not require plugging
in. Although they use less fuel than conventional petrol cars, they have some exhaust
emissions [45].
Plug in Hybrid Electric Vehicles (PHEVs)
Hybrid electric vehicles (HEVs) with bigger batteries that can be recharged by plugging
a charging cable into an external electric power source in addition to internally by their
on-board internal combustion engine-powered generator are called plug-in hybrid electric
vehicles (PHEVs). They have a finite range of operations on electric power before switching
to the petrol engine. PHEVs provide the ease of daily driving without a plug while allowing
for electricity usage or on short journeys [46].
Fuel cell electric vehicles (FCEVs)
Fuel cell electric vehicles (FCEVs): FCEVs react hydrogen gas with oxygen in the air
to create power. They don’t have a battery, and their sole waste is water vapor. Although
FCEVs can be refueled in a few minutes and have a greater driving range than BEVs, there
is still a lack of hydrogen refueling infrastructure [47].
Extended Range Electric Vehicles (ER-EVs)
Extended Range Electric Vehicles (ER-EVs) are a type of electric vehicle that combines
the features of a Battery Electric Vehicle (BEV) and a Plug-in Hybrid Electric Vehicle
(PHEV). ER-EVs have a larger battery pack than PHEVs, which allows them to travel longer
distances on electric power alone. However, once the battery is depleted, a small gasoline
engine generates electricity to power the electric motor and extend the vehicle’s range [
48
].
ER-EVs are becoming more popular as they offer the benefits of both BEVs and PHEVs.
They can be driven purely on electric power for shorter trips and travel long distances
Appl. Sci. 2023,13, 6016 8 of 23
without stopping and recharging the battery. ER-EVs are also more environmentally
friendly than traditional gasoline-powered vehicles as they produce fewer emissions.
One example of an ER-EV is the Chevrolet Volt, which has a battery range of approx-
imately 53 miles before the gasoline engine kicks in. ER-EVs are a promising option for
consumers looking for a more sustainable mode of transportation but needing the flexibility
to travel longer distances.
Each type of EV has its advantages and disadvantages. BEVs and FCEVs produce
no tailpipe emissions and are considered more environmentally friendly, but their limited
range and lack of infrastructure may be a challenge for some users. HEVs and PHEVs
offer more flexibility and do not require new infrastructure, but they still produce some
emissions and are less environmentally friendly than BEVs and FCEVs [48].
2.3.2. Benefits of Electric Vehicles
Environmental Benefits
Since EVs don’t emit tailpipe emissions, they don’t contribute to air pollution or
greenhouse gas emissions. Even when fossil fuels are needed to generate energy to power
the EV, it emits less pollution than a typical gas-powered vehicle [37].
Lower Operating Costs
Compared with regular cars, EVs offer lower running costs. In general, electricity is
less expensive than petrol or diesel, and as electric vehicles have fewer moving components,
they require less maintenance. Due to electric motors’ excellent durability compared with
internal combustion engines, they also often have longer lifespans [37].
Energy Independence
Renewable energy sources, including solar or wind power, may power EVs. This
lessens reliance on fossil fuels and may increase the sustainability of energy use [37].
Efficiency
Compared with conventional cars, EVs are more efficient. The efficiency of the power
plant will also affect the well-to-wheel (WTW) effectiveness. Compared with diesel cars,
which vary from 26% to 38%, the overall WTW productivity of petrol vehicles ranges from
12% to 28%. In comparison, the WTW efficiency of EVs powered by natural gas power
plants ranges from 14% to 30%, while EVs powered by renewable energy show an overall
efficiency of up to 70% [37].
Smooth and Quiet Operation
EVs operate significantly more quietly and smoothly than conventional cars because
electric motors generate less vibration and noise. This may result in a more relaxing and
pleasurable driving experience [37].
Convenience
EVs may be charged at residences or public charging stations, so going to the petrol
station is no longer necessary. Additionally, many EVs include capabilities that enable
drivers to remotely warm up or cool the cabin, which may be helpful in extremely hot or
cold weather [37].
Performance
Electric motors can produce instant torque, allowing EVs to accelerate quickly. They
could also have a lower center of gravity, making them more maneuverable and stable [
37
].
3. Challenges of Implementing Electric Vehicles
Public sector operators in the EV market include utilities, state and municipal govern-
ments, and private sector players, including EV service contributors, fleet workers, and
Appl. Sci. 2023,13, 6016 9 of 23
individual car holders. Variable adopters, such as private automobile owners, managers
of private business fleets, and public fleets, make varied operational decisions. Following
the types and distribution of adopters, at-home charging, public charging, and battery-
swapping stations should be optimized for the charging models. The customer type is also
connected to incentive programs and infrastructure deployment [
19
]. An overview of the
EV service industry’s members and some of the key problems they deal with is shown in
Figure 5.
Appl. Sci. 2023, 13, 6016 9 of 24
Performance
Electric motors can produce instant torque, allowing EVs to accelerate quickly. They
could also have a lower center of gravity, making them more maneuverable and stable
[37].
3. Challenges of Implementing Electric Vehicles
Public sector operators in the EV market include utilities, state and municipal gov-
ernments, and private sector players, including EV service contributors, eet workers, and
individual car holders. Variable adopters, such as private automobile owners, managers
of private business eets, and public eets, make varied operational decisions. Following
the types and distribution of adopters, at-home charging, public charging, and baery-
swapping stations should be optimized for the charging models. The customer type is also
connected to incentive programs and infrastructure deployment [19]. An overview of the
EV service industry’s members and some of the key problems they deal with is shown in
Figure 5.
Figure 5. EV service operations/participants.
According to this denition, an “EV is any vehicle in which most of the driving en-
ergy comes from a baery of electricity. (e.g., baery electric vehicles [BEVs], plug-in elec-
tric vehicles [PEVs], and plug-in hybrid electric vehicles [PHEVs]). A BEV is powered only
by its baery pack, which can be charged from the electrical grid. In contrast, PHEVs use
an internal combustion engine, an electric motor for mobility, and a baery that can be
charged from the power grid. BEVs and PHEVs are also called “PEVs”, which are EV va-
rieties that can be charged using energy from the grid [49]. Lithium-ion baeries are the
most popular alternative for electric vehicles (EVs), followed by lead-acid, nickel-metal
hydride, and sodium-nickel chloride baeries [50]. Various charging levels can be used to
recharge an EVs baery. A baery requires 28 h to fully charge at level 1 or level 2, which
is at 110–240 voltage, also known as ordinary charging, but level 3 (480 V), also known as
rapid charging, requires just 20 to 40 min. The expense of an EV’s baery is still signicant.
From up to USD800 (2012), the cost of electric vehicle lithium-ion baery bundles (per
Figure 5. EV service operations/participants.
According to this definition, an “EV” is any vehicle in which most of the driving
energy comes from a battery of electricity. (e.g., battery electric vehicles [BEVs], plug-in
electric vehicles [PEVs], and plug-in hybrid electric vehicles [PHEVs]). A BEV is powered
only by its battery pack, which can be charged from the electrical grid. In contrast, PHEVs
use an internal combustion engine, an electric motor for mobility, and a battery that can
be charged from the power grid. BEVs and PHEVs are also called “PEVs”, which are EV
varieties that can be charged using energy from the grid [
49
]. Lithium-ion batteries are the
most popular alternative for electric vehicles (EVs), followed by lead-acid, nickel-metal
hydride, and sodium-nickel chloride batteries [
50
]. Various charging levels can be used to
recharge an EV’s battery. A battery requires 2–8 h to fully charge at level 1 or level 2, which
is at 110–240 voltage, also known as ordinary charging, but level 3 (480 V), also known as
rapid charging, requires just 20 to 40 min. The expense of an EV’s battery is still significant.
From up to USD800 (2012), the cost of electric vehicle lithium-ion battery bundles (per kWh)
is anticipated to fall to USD125 by 2022. Battery degeneration happens while the battery is
stored, corresponding to annual aging, and when it is charged and discharged [33,51].
The EV sector differs from the traditional ICV industry in several ways, making
challenges with growing EV service operations more difficult. Below is a summary of these
broad problems.
3.1. Charging Infrastrcture
EV-related technologies are still developing; hence, their future course is yet unknown.
For instance, one of the most important elements influencing EV acceptance is the battery
Appl. Sci. 2023,13, 6016 10 of 23
performance, which is still not at its peak. Despite recent advancements in the construction
of charging infrastructure, it is still not as accessible or practical as conventional petrol
stations. This can make it challenging for EV drivers to locate charging outlets when
needed, especially when traveling long distances or in remote places. The speed of battery
recharging is another ambiguous technological aspect. It has long been anticipated that
fast and secure charging will let Electric vehicles replace Individually Constructed Vehicles.
Global-scale fast charging would, however, increase the stress on the electric grid and, as a
result, pose several stability issues for power systems. Another source of misunderstanding
in technical standards are those for charging interface standards. Prior agreement on
recharging standards will be essential for developing the EV market, as more diverse
standards require more significant infrastructure expenditure. Additionally, many charging
standards make producing their goods more challenging for EV suppliers and automakers.
3.2. Interconnected Public Policies
The EV industry is still in its infancy, given the total dominance of Individually
Constructed Vehicles in the international car market. The public sector has a crucial
role in encouraging the use of EVs. Many nations are implementing various policies to
make it easier for EVs to be introduced and consolidated into the market. These rules
and associated laws cover gasoline taxation, carbon emission controls, public charging
infrastructure, monetary incentives and public subsidies, and support for electric vehicle
study and development. Incorporating three interconnected factors—investment in electric
vehicle charging infrastructure, state subsidies, and public acceptance of EVs—will help to
increase EV adoption. Various new decision-making difficulties must be resolved for these
policies to be successfully implemented. Public policymaking is complicated and made
more difficult by the high levels of uncertainty and market dynamics for EVs.
3.3. Business Strategies
How a firm or group of businesses provides one or more goods or services is called its
“business strategy”. The EV sector has suggested cutting-edge ownership models, including
battery swapping and EV sharing, to address problems such as range anxiety and high
upfront costs. For this, the Beijing EV firm, a top electric vehicle manufacturer in China, set
up battery switching places for electric taxi cabs in 2015. Sinopec, a firm benefiting from a
vast transportation network, worked with Beijing Electric Vehicle Company to implement
these stations [43].
Vehicle sharing is a well-liked type of business where people hire automobiles for brief
intervals, frequently per hour/day. Customers can access a sizable fleet of automobiles by
signing up for a car-pooling program and paying a yearly fee. EV sharing mixes the business
concepts of EVs and automobile sharing. Many local states are increasingly pushing electric
vehicle sharing schemes by providing numerous forms of monetary incentives because of
the growth of the sharing economy. This approach is appealing since it enables users to
utilize EVs on a budget. Car2go, a division of Daimler AG, runs a car-sharing program
with all-electric fleets in San Diego (USA), Amsterdam (The Netherlands), and Stuttgart
(Germany) [5256].
Therefore, it is probable that developing business strategies will provide several
approaches to get over obstacles to broaden EV implementation. However, specialists and
scholars must examine the pertinent issues with these service operations’ business models.
4. Strategies for Overcoming Challenges
It is generally known that, as compared with cars powered by internal combustion
engines (ICEs), electric vehicles (EVs) have the potential to provide significant societal and
personal advantages. Recent research has looked at the many obstacles EVs encounter and
has typically determined that the most common ones are cost, range, infrastructure for
charging, and customer perceptions.
Appl. Sci. 2023,13, 6016 11 of 23
Compared with refueling ICEVs, the range of BEVs is presently constrained, and
charging still takes much longer. As a result, route design is excessively optimistic, and
some routes are too lengthy for battery electric vehicles (BEV). Therefore, this research
paper proposes suitable strategies for implementing electric vehicles (EVs) in smart cities.
4.1. Charging Infrastrcture
Since electric vehicles often have a smaller driving range than conventional vehicles,
their owners may be concerned that they may run out of juice before reaching their desti-
nation. Even though the range of EVs is expanding, some drivers, particularly those who
need to go long distances, still find it challenging [
57
]. However, the consumer will be
aware of the open slots if they can reserve charging times in advance. Customers can thus
research alternative slots besides those already waiting in line. By answering consumers’
queries and easing their worries over the charging network, good charging infrastructure
will also help to reduce their “range anxiety” [1].
There are several ways to effectively alleviate range anxiety, even if it makes customers
unhappy and presents an economic hurdle to EV adoption.
First, fast DC charging is a practical method for reducing the time it takes to recharge
and extending the range when traveling between cities by highway. Various driving
styles have various energy and recharge requirements; thus, EV infrastructure planners
should consider this. Properly and dynamically building EV recharging infrastructure
helps alleviate range anxiety [28].
Second, a mathematical vehicle model that can forecast “real road” driving energy
consumption and drivable range may be utilized to estimate accurate energy consumption
and drivable range.
Third, developing countrywide charging stations can also help alleviate range anxiety,
but this cannot be done without government incentives or public-private collaboration.
Finally, range anxiety can be decreased by using a network path selection model. For
EV drivers, this model chooses the quickest and best route using an algorithm. These
models, meanwhile, might be improved by judging the exit time and duration of a stop
at a charging station. The driving range can be increased by employing series, parallel,
and series-parallel charging arrangements with extremely efficient electric motors. To
partially alleviate range anxiety, some EV manufacturers even provide complimentary
rental automobiles for local trips outside the EV range [19,42].
4.2. Balancing Auxiliary Loads
Auxiliary loads greatly impact how much energy electric cars use, which cuts down
on how far they can go. First, heavy auxiliary loads drain batteries in city driving cir-
cumstances, reducing the EV’s range. The driving range decreases by 17.2–37.1% (under
simulated settings) when the AC is activated in the summer. Similar to how EVs employ
PTC (Positive Temperature Coefficient) heaters, the range spans from 17% to 54% (under
simulations) owing to the need for heating in the cold [
57
,
58
]. Second, when electric cars are
driven at highway speeds, the effects of auxiliary loads such as air conditioning and heating
have not yet been fully investigated. Finally, there are significant differences in the impact
of supplementary loads in a lab setting and on actual roadways. Under ideal conditions,
such as with little auxiliary loads and the help of a regenerative brake system (RBS), electric
vehicle producers may achieve low energy consumption and an extended driving range;
nevertheless, this ideal outcome is different when EVs are driven on highways amongst
towns [33].
One way to address the problem of limited range and high energy usage brought on
by auxiliary loads is to utilize a heat pump to heat EVs in the winter. This can increase the
driving range by 7.6–21.1% thanks to a higher heating coefficient of performance (CoP). The
vapor compression cycle of a heat pump oversees both cooling and heating. Additionally, a
four-way valve that reverses refrigerant flow is included. Additionally, its coefficient of
performance is 1% greater than that of PTC heaters. Additionally, a precise assessment of
Appl. Sci. 2023,13, 6016 12 of 23
EVs’ heating and cooling demands may significantly reduce the energy used by the AC
system. An appropriate energy management technique can also lower the total energy
consumption when cooling. Consequently, a suitable energy management strategy may
regulate energy use instead of the ON/OFF technique [59].
Another approach is the system configuration that has been suggested, which uses a
traction shaft to clutch the AC compressor motor during braking intervals. This method
not only helps the EV to weigh less but also uses less energy [60].
4.3. Improved Battery Technology
The limitations of battery technology are one of the main obstacles to the widespread
use of electric vehicles (EVs). The present battery design for EVs has a poor energy density,
which impacts the vehicle’s driving range [
58
]. To improve EV efficiency, a variety of battery
technologies and combinations have been created over time. Users see electric vehicles as a
real alternative to internal combustion engine vehicles because of the development of better,
more affordable, and higher-capacity batteries, which will increase vehicle autonomy.
Since batteries are vital to EVs, more manufacturers (such as LG, Panasonic, Samsung,
Sony, and Bosch) are investing in creating better, more affordable batteries.
The battery bundle is the costliest part of any EV. For instance, the Nissan LEAF’s
lithium-ion batteries originally accounted for one-third of the total cost of the car. However,
it is anticipated that this cost will gradually decrease; as of the end of 2014, the battery pack
cost around $500 per kWh (half the price in 2009); now, the price per kWh is $200, and it is
anticipated to drop to approximately $100 in 2025. The fact that Tesla Motors is creating a
“Mega factory” to lower manufacturing costs and enhance battery output is another piece
of data supporting the trend towards lower battery costs [59].
The price of EVs would naturally decrease because of decreasing battery costs, making
them more competitive with other types of cars.
Figure 6depicts the battery capacity of various EVs from 1983, when the Audi Duo
was first sold, when it had an 8-kWh battery, through 2022, when Tesla claimed it would
sell a Tesla Roadster with a 200-kWh battery. The GMC Hummer EV Pickup Edition 1 has
the largest battery capacity at 212 kWh [60].
Appl. Sci. 2023, 13, 6016 13 of 24
Figure 6. Baery capacity development from 1980–2025 [61].
The following section discusses three issues with suitable proposals relating to EV
baery technology, including baery nature, baery price, and electric vehicle chargers.
4.3.1. Baery Type
Technology for EV baeries must advance signicantly to meet this demand. A good
EV baery should be lightweight, aordable, safe, and long-lasting. It should also have a
high energy density and a high-power density. The ability of a baery to hold energy is
referred to as energy density. A gadget can be maintained and charged longer with a mas-
sive energy-density baery since it can store more energy [59]. Cycle durability is also an
important phenomenon in baeries. This is the number of “full” charge/discharges cycles
the baery can tolerate before its capacity drops to under 80% in terms of its life cycle. If
a baery is only 60% discharged and fully charged, it has not gone through a charge/dis-
charge cycle. Depending on the baery type, the percentage may vary. The conclusion is
that an EV baery shouldnt have a short life cycle [61], as shown in Table 2.
The baery’s memory eect describes a situation in which it retains the rate of its
most recent discharge and won’t produce any more than that (even throughout a fresh
charge/discharge cycle). Alternatively, the baery “remembers” how much of its capacity
was used up the prior time and won’t supply it anymore. The memory eect is no longer
a concern because of advancements in baery technology [61–66].
The discharge rate is the pace at which a baery expends or discharges energy. A
high-discharge-rate baery is inappropriate for EVs since it cannot be utilized for ex-
tended durations while being charged. Numerous EV baery technologies exist; some are
listed below:
Lead-acid baeries are the rst kind of baeries used in electric vehicles. These bat-
teries are made of acid that produces electricity and lead electrodes. The electrolyte
level needs to be checked frequently, and these baeries are hefty and have a low
energy density. Additionally, they are not environmentally friendly.
The second sort of baery is nickel-based, which is thought to be beer developed
and has a comparatively greater energy density. However, its shortcomings include
low power density and poor charge/discharge eciency. The memory consequences
and insignicant performance in cold temperatures are further issues with nickel-
based baeries.
Baeries that are made of nickel metal hydride (Ni-MH) have negative electrodes,
which are made of an alloy that can store hydrogen rather than cadmium (Cd) [67].
Many hybrid cars, such as the Toyota Prius and the second-generation GM EV1, em-
ploy these baeries even though they exhibit more self-discharge than nickel-cad-
mium baeries. Along with a lead-acid model, the Toyota RAV4 EV also came in a
nickel-metal hydride model.
Figure 6. Battery capacity development from 1980–2025 [61].
The following section discusses three issues with suitable proposals relating to EV
battery technology, including battery nature, battery price, and electric vehicle chargers.
Appl. Sci. 2023,13, 6016 13 of 23
4.3.1. Battery Type
Technology for EV batteries must advance significantly to meet this demand. A good
EV battery should be lightweight, affordable, safe, and long-lasting. It should also have
a high energy density and a high-power density. The ability of a battery to hold energy
is referred to as energy density. A gadget can be maintained and charged longer with a
massive energy-density battery since it can store more energy [
59
]. Cycle durability is also
an important phenomenon in batteries. This is the number of “full” charge/discharges
cycles the battery can tolerate before its capacity drops to under 80% in terms of its life
cycle. If a battery is only 60% discharged and fully charged, it has not gone through a
charge/discharge cycle. Depending on the battery type, the percentage may vary. The
conclusion is that an EV battery shouldn’t have a short life cycle [61], as shown in Table 2.
Table 2. Battery Types [62,63].
Battery Type
Working
Temperature
(C)
Specific
Energy
(W/kg)
Energy
Density
(W/L)
Specific
Power
(W/kg)
Cell Voltage
(V)
Cycle
Durability
Memory
Effect
Lead acid 20–45 30–60 30–50 180 2.1 1000 No
Ni-cd 0–50 60–80 60–150 120–150 1.35 2000 Yes
Ni-MH 0–50 60–120 100–300 250–1000 1.35 500 No
Zn-Br2 20–40 75–140 60–70 80–100 1.79 >2000 No
Na-S 300–350 100–130 120–130 150–290 2.08 2500–4500 No
Zn-Air 300–350 100–130 460 80–140 2.1 200 No
Li-S 300–350 100–130 350–650 - 2.1 300 No
Li-Air 300–350 100–130 1300–2000 - 2.1 200 No
Li-ion 20–60 100–275 200–735 150–300 3.6 400–3000 No
The battery’s memory effect describes a situation in which it retains the rate of its
most recent discharge and won’t produce any more than that (even throughout a fresh
charge/discharge cycle). Alternatively, the battery “remembers” how much of its capacity
was used up the prior time and won’t supply it anymore. The memory effect is no longer a
concern because of advancements in battery technology [6166].
The discharge rate is the pace at which a battery expends or discharges energy. A
high-discharge-rate battery is inappropriate for EVs since it cannot be utilized for ex-
tended durations while being charged. Numerous EV battery technologies exist; some are
listed below:
Lead-acid batteries are the first kind of batteries used in electric vehicles. These
batteries are made of acid that produces electricity and lead electrodes. The electrolyte
level needs to be checked frequently, and these batteries are hefty and have a low
energy density. Additionally, they are not environmentally friendly.
The second sort of battery is nickel-based, which is thought to be better developed
and has a comparatively greater energy density. However, its shortcomings include
low power density and poor charge/discharge efficiency. The memory consequences
and insignificant performance in cold temperatures are further issues with nickel-
based batteries.
Batteries that are made of nickel metal hydride (Ni-MH) have negative electrodes,
which are made of an alloy that can store hydrogen rather than cadmium (Cd) [
67
].
Many hybrid cars, such as the Toyota Prius and the second-generation GM EV1,
employ these batteries even though they exhibit more self-discharge than nickel-
cadmium batteries. Along with a lead-acid model, the Toyota RAV4 EV also came in a
nickel-metal hydride model.
Appl. Sci. 2023,13, 6016 14 of 23
Batteries made of zinc and bromine (Zn-Br2) are batteries that employ a zinc-bromine
solution kept in two tanks and in which the positive electrode undergoes a bromide-
to-bromine conversion. In 1993, a prototype named “T-Star” used this technology [
59
].
Sodium sulfur batteries (Na-S) are made of sulfur and sodium liquid (S). This kind of
battery has a large life cycle, a high energy density, and great loading and unloading
efficiency (88–92%). They also have the benefit of these materials being relatively
inexpensive. They may operate at temperatures between 300 and 350
C, but the Ford
Ecostar, a vehicle that debuted in 1992–1993, uses these batteries [54].
Rechargeable lithium-ion batteries are a widespread energy storage system for com-
puters, cellphones, and electric vehicles. They are renowned for having a high energy
density, allowing for greater electric car driving ranges and longer battery life for
electronic gadgets. To enable the movement of electrical current, the batteries employ
lithium ions to transmit energy between the positive and negative electrodes.
Batteries made of lithium-sulfur (Li-S), zinc-air (Zn-air), and lithium-air (Li-Air) are
among the battery types used in the third category of batteries. Li-S is the least
expensive of them all, thanks to the low price of sulfur, and it also has a high energy
density [61].
When examined independently, Li-S has a rapid life cycle and a high discharge rate.
Zn-Air is a “potential” future option for EV battery technology because its “theoretical/in-
lab experiments” show a high energy density of 1700 W/kg, which is comparable to the
conventional internal combustion engine [
38
]. However, the major drawback of a Zn-Air
battery is its low power density and short life cycle. However, it is still a prototype and not
ready for purchase. Similar circumstances apply to Li-Air, which is still in the prototype
stage and not yet on the market. For a detailed comparison of the various battery types, see
Table 2.
Lithium-ion battery operation’s temperature and voltage windows define the battery’s
safe and dependable operating range. As electrolytes begin to self-destruct above 150
C,
going over these limits would quickly reduce battery efficiency and may even cause a
safety consequence (e.g., trigger a fire or explosion) [
64
]. The majority of EVs and PHEVs
currently use this sort of battery.
Lead and zinc batteries perform worst in specific power (up to 100 W/kg), whereas
Ni-MH and Li-ion batteries perform best (up to 1000 W/kg and 3000 W/kg, respectively).
In terms of cell voltage, lithium-ion and sodium batteries (Na-S and Na-NiCl) need a higher
voltage than batteries made of nickel and zinc. On the other hand, lead-acid and Ni-MH
batteries provide the worst performance in terms of life cycles. Finally, whereas lithium
batteries can sustain up to 3000 cycles, Na-S batteries perform better and can support up to
4500 cycles [6872].
Since these battery types could increase the range of electric vehicles, further study
is being done to enhance them. To guarantee the successful operation of electric vehicles,
additional subsystems are included inside the battery system, such as a system to manage
the batteries and an adequate thermal management system. When all the considerations
are considered, current electric cars employ lithium-ion technology for their batteries since
it performs the best across most of the analyzed qualities.
4.3.2. Battery Cost
Another EV difficulty that keeps it from succeeding on the market is the expensive
price of batteries. Some key drawbacks of EV battery technology are a limited driving
range, an expensive battery cost, prolonged battery charging time, unpredictable battery
life, the excessive weight of EV batteries, and battery safety [
73
75
]. As a result, a study
should be done to create high-performance and affordable battery technology.
By 2025, battery costs are expected to drop by 70%, promoting EV adoption because of
the high energy density. This is evident in the case of lithium-ion batteries (Li-Ion), whose
price has drastically lowered because of their growing use in mobile devices and laptops.
Appl. Sci. 2023,13, 6016 15 of 23
4.3.3. Electric Vehicle Charging Devices
Most conventional electric vehicle charging devices are one-directional, making incor-
porating them into the system challenging. Nonetheless, this issue may be resolved using a
bidirectional EV charger. Future “super-fast” direct current chargers are anticipated to be
readily available in households, significantly reducing charging time [
75
78
]. The smart
grid may experience a decrease in load because of this advancement, and battery life may
be extended. More study is required to advance this field, which also addresses EV battery
technology, and overcome the EV charging problem.
4.4. Enhancing EV Charging Procedures—Battery Switching Stations
To lessen range anxiety, battery swapping stations might be utilized in place of battery
charging stations. Standard, fully charged batteries are kept on hand at battery switching
points for EV drivers to swap out and continue their trip quickly. In this way, EVs at a
charge station along a highway can be changed immediately. The battery changing stations’
operational mechanism is depicted in Figure 7. This technology of charging EVs instantly
is already being used by Tesla and U.S. and European battery vendors [79].
Appl. Sci. 2023, 13, 6016 15 of 24
Since these baery types could increase the range of electric vehicles, further study is
being done to enhance them. To guarantee the successful operation of electric vehicles,
additional subsystems are included inside the baery system, such as a system to manage
the baeries and an adequate thermal management system. When all the considerations
are considered, current electric cars employ lithium-ion technology for their baeries since
it performs the best across most of the analyzed qualities.
4.3.2. Baery Cost
Another EV diculty that keeps it from succeeding on the market is the expensive
price of baeries. Some key drawbacks of EV baery technology are a limited driving
range, an expensive baery cost, prolonged baery charging time, unpredictable baery
life, the excessive weight of EV baeries, and baery safety [73–75]. As a result, a study
should be done to create high-performance and aordable baery technology.
By 2025, baery costs are expected to drop by 70%, promoting EV adoption because
of the high energy density. This is evident in the case of lithium-ion baeries (Li-Ion),
whose price has drastically lowered because of their growing use in mobile devices and
laptops.
4.3.3. Electric Vehicle Charging Devices
Most conventional electric vehicle charging devices are one-directional, making in-
corporating them into the system challenging. Nonetheless, this issue may be resolved
using a bidirectional EV charger. Futuresuper-fast direct current chargers are antici-
pated to be readily available in households, signicantly reducing charging time [75–78].
The smart grid may experience a decrease in load because of this advancement, and bat-
tery life may be extended. More study is required to advance this eld, which also ad-
dresses EV baery technology, and overcome the EV charging problem.
4.4. Enhancing EV Charging ProceduresBaery Switching Stations
To lessen range anxiety, baery swapping stations might be utilized in place of bat-
tery charging stations. Standard, fully charged baeries are kept on hand at baery
switching points for EV drivers to swap out and continue their trip quickly. In this way,
EVs at a charge station along a highway can be changed immediately. The baery chang-
ing stations’ operational mechanism is depicted in Figure 7. This technology of charging
EVs instantly is already being used by Tesla and U.S. and European baery vendors [79].
Figure 7. The baery changing stations’ operational mechanism.
Most conventional vehicles can operate on any of the three fuels: petrol, diesel, and
petrol, as shown by comparing traditional petrol stations and baery switching stations.
Baery switching stations will need to handle a broad range of baeries, and they may
Figure 7. The battery changing stations’ operational mechanism.
Most conventional vehicles can operate on any of the three fuels: petrol, diesel, and
petrol, as shown by comparing traditional petrol stations and battery switching stations.
Battery switching stations will need to handle a broad range of batteries, and they may run
out of one type periodically. This might cause EV drivers to get anxious. Batteries come in
various kinds: configurations, energy, and power densities.
EV drivers will be able to monitor the several battery types that are accessible thanks
to smartphone applications developed by battery switching facilities. Even better, they may
store extra batteries in advance to replace their exhaust ones. Giving the battery switching
locations and the electric vehicle driver a communication platform can significantly reduce
waiting times and eliminate range anxiety. This enables the driver to go beyond the usual
velocity range of the vehicle.
However, this can present further issues for the battery switching stations, as they
might need to keep many more batteries on hand to service clients, especially if some
switch batteries numerous times daily. Multiple approaches can be used to solve this issue.
The possibilities include limiting the number of swaps executed daily, adding a fee for each
extra swap executed within a single day, penalizing customers for exceeding their daily
limit, etc. As indicated, imposing fines may deter people from implementing EVs, so we
need to consider which solutions are workable. Furthermore, the inconsistency of some
battery types being available is another issue with battery switching stations. Due to the
possibility that switching stations could not always have enough charged batterie, it might
be challenging to service all their clients/EV drivers [79].
Appl. Sci. 2023,13, 6016 16 of 23
An EV battery-swapping station operator must continually modify charging and swap-
ping guidelines to account for changing energy prices and save operational costs. A novel
queuing network model with a service quality guarantee was used by [
80
] to research the
optimal charging procedures for battery swapping stations. They also updated the model to
incorporate battery swapping facilities and renewable energy in the power system to flatten
the power generation curve by considering locations and billing orders. A charging regula-
tion was devised by [
81
] for EV battery swapping stations. They recommended a hybrid
particle swarm optimization and evolutionary method to determine the optimum course
of action. To investigate the optimal charging/discharging method for a vehicle-to-grid
(V2G) technology-based EV battery swapping station that enables two-way energy transfer
between EVs and the power grid, ref. [
82
] created a Markov decision process model. It was
demonstrated that the best course of action was monotone, making it possible to compute
it quickly. According to the techniques for battery exchange suggested on a scientific level,
ref. [
83
] also developed an in-line routing system for electric cars that permits replacing the
batteries in BEs using Markov’s random choice processes. This method would reduce the
waiting time by about 35%. Ref. [
84
] developed robust optimization models to help with
the planning process for battery swaps.
In this regard, it is worth noticing that battery swapping technology has gained
significant traction in China. One of the key players in this space is NIO, a Chinese EV
manufacturer, which has implemented battery swapping stations across China. These
stations are fully automated and use a robotic arm to remove the depleted battery from
the EV and replace it with a fully charged one. NIO claims that the entire process takes
less than five minutes, providing a convenient and efficient way for EV drivers to continue
their journey. They have installed over 1323 battery swapping stations across China as of
March 2023.
Another company, called CATL, has developed a standardized battery swapping
solution that can be used across different EV models. This approach provides flexibility for
EV manufacturers and enables them to implement battery swapping technology without
having to develop their own proprietary solutions [
56
]. Furthermore, a study by McKinsey
& Company suggests that battery swapping technology could account for up to 30% of EV
charging in China by 2030. The study also notes that battery swapping can provide benefits
such as reducing the cost of EV ownership, improving the utilization of EV batteries, and
reducing the need for large-scale charging infrastructure [57].
Given China’s success in deploying battery swapping technology, other countries
could benefit from learning and adopting similar techniques. Battery swapping provides
a convenient and efficient alternative to traditional charging methods, which could help
accelerate the adoption of electric vehicles and reduce reliance on fossil fuels.
5. Discussion
The analytical arrangements of the key studies are offered in this section to address all
the research questions specified in Table 1.
RQ1: What are the main challenges and facilitators of electric vehicle implementation
in smart cities, and what collaborative efforts are necessary for successful integration?
The main challenges faced in adopting electric vehicles in smart cities include range
anxiety, high cost, lack of charging infrastructure, battery life and performance, and overall
public acceptance and awareness of the benefits of EVs [
85
]. Additionally, integrating EVs
into existing transportation systems and policies, such as public transit and urban planning,
can pose challenges, as described in Section 3.
Section 4.3 greatly describes the answer to this question. Firstly, with better battery
technology, electric vehicles can have longer driving ranges, alleviating the range anxiety
issue for drivers. In this regard, Figure 6shows the battery capacity development from
1980–2025, how battery technology evolved, and how it still needs improvement. Secondly,
more efficient, cost-effective batteries can lead to lower vehicle costs, making electric
vehicles more accessible to a wider range of consumers. Section 4.3.1 describes the latest
Appl. Sci. 2023,13, 6016 17 of 23
technology in batteries in this regard. Additionally, Table 2shows the battery types and their
characteristics. We can see that better battery technology can also enable faster charging
times and more extended battery lifetimes, improving electric vehicles’ overall convenience
and usability. However, focus should be on using renewable energy sources, such as solar
and wind power, so that batteries can be charged without relying on traditional fossil fuels,
thus reducing greenhouse gas emissions and promoting sustainability.
Section 4.4 explains how to improve the EV charging infrastructure that facilitates the
implementation of electric vehicles. The authors extracted the data from recent research
papers and divided the proposed strategies into flow and network stability models. To
answer the question, the authors briefly summarized that the development of charging
infrastructure and transportation could facilitate the implementation of electric vehicles in
smart cities by addressing the challenges of range anxiety and a lack of charging stations. It
involves deploying a charging station network in strategic locations such as parking lots,
public spaces, and highways. The charging infrastructure should be convenient, reliable,
and accessible to users. Promoting public transportation can encourage the use of electric
buses and trains, reducing the number of personal vehicles on the road and reducing
carbon emissions. Additionally, battery swapping stations might be utilized in place of
battery charging stations to lessen range anxiety. In this regard, Figure 7demonstrates the
working mechanism of battery switching stations.
RQ2: How have electric vehicles contributed to reducing carbon emissions, and what
is their global market share trend over time?
Section 2.3 thoroughly overviewed the electric vehicles, their classification, and their
benefits to answer this question. Figure 2shows the global electric car stock country-wise,
including battery electric vehicles (BEVs) and plug-in hybrid electric vehicles (PHEVs). The
global market share of electric vehicles has been steadily increasing over the past decade,
and it is expected to continue to grow in the future. As of 2023, sales of electric vehicles
(EVs) surged by 60%, and 1 in 7 automobiles produced worldwide are now EVs, according
to reports [
85
]. This growth has reduced carbon emissions by replacing traditional gasoline
and diesel vehicles, which are major contributors to air pollution and greenhouse gas
emissions. As electric vehicles become more prevalent and the electricity grid becomes
cleaner, the potential for even greater carbon emissions reductions will continue to increase.
Figure 1shows the energy-related carbon dioxide emissions in the US, China, and Europe
from 1983 to 2023.
RQ3: What are the potential future research directions for electric vehicles in smart
cities, with a focus on improving battery technology, addressing range anxiety, reducing
charging times, and promoting EV adoption?
Even though there has been a lot of advancement in the evolution and develop-
ment of electric vehicles, especially in recent years, Section 6discusses the problems that
are still being worked on or that may be worth looking into to find better and more
innovative resolutions.
6. Future Research Recommendations
Even though there has been a lot of advancement in the evolution and develop-
ment of electric vehicles, especially in recent years, this section discusses the problems
that are still being worked on or that may be worth looking into to find better and
more innovative resolutions.
6.1. EV Batteries: Recent Developments and Innovations
As we have previously stated, in electric cars (EVs), batteries are among the most
critical components because they account for most of the vehicle’s cost and directly affect
the EV’s performance.
Due to the growth in durability, charging density, and charge and discharge processes,
the creation of new technologies that can exceed the current lithium-ion batteries primarily
used in vehicles has forced the employment of various resources [85].
Appl. Sci. 2023,13, 6016 18 of 23
Keeping in mind all the parameters, it is seen that there is more work to be done
in this area, mainly due to the importance of batteries, which might significantly speed
up the development of EVs and the acceptance of these vehicles. New components and
technologies are now the subject of investigation. In this regard, new research is underway
utilizing pure carbon, which makes up the substance known as graphene, which is very
light and has a high thermal conductivity. Graphene-based batteries scarcely warm-up,
which is one of their main advantages, allowing for quick or ultra-quick charges without
suffering considerable power losses from heat [60].
A 900 horsepower GTA Spano car with a graphene battery attached has a range of
800 km
, according to Graphenano, a Spanish business. This battery can be charged in about
5 min
using a high-power outlet. Although graphene batteries are still in the development
phase, there are prototypes with a specific energy of 1.0 kWh/kg, and it is projected that
they will soon reach 6.4 kWh/kg [60].
According to this theory, the technology that can make EVs more autonomous and
significantly shorten the time needed for a full charge will be the one that prevails in
the market.
6.2. Artificial Intelligence in EV
As was already noted, several things will need to come together for electric cars to
fully replace other modes of transportation on our roads and in our towns [86102].
There is a large research gap in this area as the world moves towards AI. Battery
temperature regulation, better and more intelligent charging, and energy-efficient routing
are just a few of the artificial intelligence (AI) ideas for EV themes that have been proposed.
Ref. [
103
] offers a unique machine learning-based approach for successful routing. Their
method may be used to forecast the energy consumption of the multiple road segments
that make up the planned or actual vehicle routes. Ref. [
104
] addresses the problem of
planning the routes for a fleet of electric vehicles. Their approach considers the vehicle’s
maximum battery capacity and the concurrent use of charging stations along the route and
employs a developing genetic algorithm with a learning process.
To improve the thermal management system and lower overall energy consumption,
ref. [
105
] recommends employing Artificial Neural Networks (ANNs) for battery thermal
management. The battery temperature may be maintained within acceptable limits under
the scheme. Ref. [
106
] examines the relationship between battery thermal behavior and
design factors. Their computational analysis reveals that a cooling method based on
distributed forced convection may result in uniform temperature and voltage distributions
across the battery pack at different discharge rates.
Based on that, artificial intelligence (AI) will promote the development of new solu-
tions, which are:
1.
Streamline the battery charging process (by enabling early booking of the charging
point, providing automatic power balancing capabilities, allowing adaptive charges
based on context, etc.)
2.
Improve the power generation process to handle the significant increase in electric
demand on the grid (by providing predictions of the required power at every moment,
mobility analysis of the E-mobility, etc.).
Thus, the Internet of EVs (IoEVs) is about to become a reality, which will undoubt-
edly impact how we move about but also offer up a whole new universe of exploration
containing new applications and services.
6.3. Public Policies
As mentioned earlier, government subsidies are a significant element in promoting
EV adoption. Few models have been developed to explore how governments may utilize
subsidies to stimulate EV adoption among customers with restricted budgets, even though
the influence of subsidies on EV production has been studied in previous studies.
Appl. Sci. 2023,13, 6016 19 of 23
Further study is primarily needed to better understand subsidies’ objectives and the
design of government subsidy programs and policies to maximize EV market demand or
consumer surplus while considering the objectives of EV manufacturers, retailers, and con-
sumers. Game models provide a solution to this problem. Some elements will significantly
impact the objectives and plans of subsidy programs, including customers’ negotiation
power when choosing between individually constructed vehicles and electric vehicles.
Government subsidies will impact the transition and expansion of the automotive
sector. It’s still unclear how governments should balance competing goods (such as BEVs
and ICVs) with the goals of various supply chain structures (such as the producer, retailer,
or client). Government subsidies, for instance, will impact manufacturer output and price,
retailer orders and pricing, and consumer demand if a manufacturer offers battery electric
vehicles and individually constructed vehicles and sells them through distinct retailers.
Different circumstances can be characterized using game models. It is possible to determine
the optimum industrial structure by comparing the outcomes of several situations.
7. Conclusions
The paper discusses electric vehicles (EVs), their benefits and potential, and the obsta-
cles to their adoption and integration into smart cities such as range anxiety, infrastructure,
and battery cost. The study indicates that integrating EVs into smart cities can create a
sustainable and efficient urban environment with lower operating costs, reduced green-
house gas emissions, and improved air quality. Smart cities can overcome the challenges
associated with EV adoption by developing robust charging infrastructure, implementing
smart grid technologies, and utilizing data analytics. By promoting the use of EVs in
smart cities, we can build more livable and sustainable cities that prioritize the health and
well-being of residents while reducing our carbon footprint.
Implementing electric vehicles (EVs) faces challenges such as high upfront costs,
limited driving range, charging infrastructure inadequacy, and public perception. However,
these challenges can be addressed via government policies, private sector investment, and
public education to increase EV adoption, develop new business models that enable EV use,
invest in charging infrastructure, improve battery technology and charging speeds, and
increase awareness about the benefits of EVs. Overcoming these challenges can accelerate
the transition to a sustainable transportation system and mitigate climate change impacts.
The article discusses strategies to promote the adoption of electric vehicles (EVs) as
a sustainable mode of transportation. These strategies include supportive policies and
regulations, investment in charging infrastructure, and public education and outreach
initiatives. Governments can help by providing financial incentives, mandating minimum
EV sales targets, and funding charging infrastructure. Private companies can invest in
charging infrastructure, develop new business models, and partner with automakers to
promote EV adoption. Public education programs can help overcome obstacles such as
range anxiety and a lack of knowledge about the benefits of EVs. By implementing these
strategies, we can transition to a more sustainable transportation system while reducing
our dependence on fossil fuels and combating climate change.
The future of electric vehicles looks positive with advancements in battery technology,
charging infrastructure, and supportive policies. Battery prices are expected to drop
significantly, making EVs more affordable and convenient for consumers. Switching to
EVs can help reduce reliance on fossil fuels and combat climate change, and incorporating
them into smart city programs can improve efficiency. As the market grows, we can expect
new models with improved driving ranges and faster charging times, potentially including
self-driving EVs.
Funding:
This research was funded by the Deputyship for Research & Innovation, Ministry of
Education in Saudi Arabia for funding this research work with project number 223202.
Institutional Review Board Statement: Not applicable.
Informed Consent Statement: Not applicable.
Appl. Sci. 2023,13, 6016 20 of 23
Data Availability Statement: The data will be available by author upon requested.
Acknowledgments:
The author extend his appreciation to the Deputyship for Research & Inno-
vation, Ministry of Education in Saudi Arabia for funding this research work through the project
number 223202.
Conflicts of Interest: The authors declare no conflict of interest.
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