Questions related to Energy Storage
contextualise climate change, think of batteries, solar, wind...
One answer is: Capacitors can temporarily store energy, but they cannot contain as much energy density as batteries, which makes them unsuitable for long-term energy storage and delivering continuous power supply. In addition, capacitors have a tendency to discharge quickly, which is undesirable for numerous applications that need a constant and protracted energy source.
what's your opinion
Current i am doing some research on energy storage application of dual active bridge converter. I am stuck with a question about the consequence that there might occur if the two voltage source is connected without an inductor Any mathematical leads will be highly appreciated?
It's as a simple or complicated question as follows. After we published 2001 a certain article in Electrochimica Acta (https://doi.org/10.1016/S0013-4686(01)00738-1), where we showed in our recent article (10.1016/j.electacta.2023.142458) that the charge storage process in oxides containing transition metals (TMOs) could be a physical process without restrictions due to mass transport, now with new "insights", we publish this article below where a new theoretical model for TMOs yields different equations contemplating the different electrochemical techniques (e.g., voltammetry, chrono-methods, and impedance). It was demonstrated, comparing with renowned works (e.g., Trasatti et al. - more than 1100 citations and De Levie - more than 1400 citations) that in the specific case of TMOs, widely used in Energy Storage Devices, that the proposed model in this our work allows a "complete interpretation" of the main phenomena occurring during the charge/discharge process in Supercapacitors. On the contrary, the famous models of Trasatti and De Levie completely fail in the light of the present work.
We also validated the proposed model in carbon-based materials such as Activated Carbon and Pressed Nanotubes. See our work below using Chronocoulometry and Chronoamperometry, respectively:
(Lenon et al.) https://doi.org/10.1016/j.jelechem.2022.117140
(Pinzón et al.) https://doi.org/10.1016/j.est.2023.106858
Link for free access from the Publisher valid for 50 days:
In addition to the published paper, I am feeling the necessity to clarify some points not considered explicitly by us of historical relevance and important consequences as is the misinterpretations of the charge-storage process in Pseudocapacitors committed by several authors. The history behind the attempt to explain the theoretical basis of the pseudocapacitance in TMO (or DSA) electrode materials has two major authors, Professor S. Trasatti and Professor B.E. Conway. To quote, Trasatti (Italy) and Conway (Canada) were two of the greatest Electrochemists of the phase called “Modern Electrochemistry” together with Delahay, Sluyters, Vetter, Parsons, Savèant, Oldham, De Levie, Lasia, Bockris, Bard, among others. However, Professor Trasatti, who proposed the Protonic Condenser model for TMOs, always insisted on an intuitive (ad hoc) method of analysis. In this way, he and his co-workers completely failed to obtain significant “quantitative simulations” for the dependence of voltammetric charge as a function of the scan rate (CV technique) by using the equation q = a + b/[root(scan rate)] and/or 1/q = c + d[root(scan rate)], that is, Trasatti et al. used the charge referring to cyclic voltammetry, even knowing that there is no way to perform the analytical integration of the Randles-Sevckic model to obtain the theoretical charge-scan rate dependency for reversible systems. The use by several authors of this model proposed in 1989 led to numerous errors in the literature. The largest of these errors culminates in the model commonly known as Dunn’s model which is used to decouple the capacitive charge contribution and its faradaic counterpart controlled by diffusion mass-transport. These last authors committed the gross error of assuming that the slope in your equation, i-total/(scan rate root) = (ic)x(scan rate root) + (if), does not vary with the electrode potential, which is impossible according to the CV theory, i.e., the so-called “current function – Xsi(pi-time)” varies for each potential/voltage value. In the case of Professor Conway’s works dealing with pseudocapacitors, he tried to explain using the impedance technique (EIS) by applying "non-blocked" equivalent circuits composed of two distinct time constants (see the models in his classic book on SCs) to include in an "ad hoc" way his classical models developed between 1960-1970 related to "pseudocapacitance adsorption" using the CV technique. Then, using the so-called "brush model", he unsuccessfully tried to explain the phenomena of an electrical double layer linked to surface roughness with cyclic voltammetry using a single time constant. On the contrary, between 2014-2017, Saveànt et al. published important articles where they proposed that capacitance and pseudocapacitance are equivalent (indistinguishable) events. However, these authors were not concerned with the "roughness/porosity” factors, thus leaving behind the aspects related to the resistances and capacitances distributed into pores/cracks. Bearing all this short history in mind, our present article published in April 2023 innovatively addressed the fundamental aspects of pseudocapacitors that were not properly, intentionally, or not, considered by several prominent authors. Finally, our article tried to unify using a simplified model the use of the different electrochemical techniques in light of a single theoretical premise. It is worth mentioning that Professor A. Lasia previously considered some fails in De Levie’s model, when applied to real electrodes containing an assembly of pores, by including the capacitance referring to the flat regions connecting the individual pores as a parallel combination (Ctotal = Cporous + Cflat). This is necessary since De Levie proposed analytical solutions for single pores.
On the use of gel polymer electrolyte in energy storage devices.
For example, how can I find out how many articles have been published since 1999?
How can i do this from Web of Science
As shown in this discharge voltage-capacity diagram, an irregular upward voltage reversal occurs at the beginning of the discharge process. What could be the cause, and how could it be prevented?
What are main challenges to split water at low input potential (V) to produce hydrogen for future Hydrogen requirement as energy storages system.
First, please i would like to know what is the influence of the valence state of an element in a perovskite structure on the Curie temperature, and secondly why it is better to have a high Curie temperature for energy storage applications?
Hello, i want to ask what is exactly the relation between the permittivity and energy storage for ferroelectrics materials?
Thank you in advance
Is there any specific standard for current densities while taking charge/discharge data? I mean at what current densities the data should be taken for publications?
with mulatiple oxidation states is one of the important factor for high energy storage. my q for high energy storage. my querry is, w
I work in a liberal art based university. I would like to propose a course about energy storage and conversion technologies. However, it is a challenge to find a textbook that could be used to teach this topic to non-science students.
Hi! I am trying to implemet an control algorithm to give a command to my energy storage system when to charge to absorb excess renewable power generation and discharge when renewable power generation is low. I am using matlab/simulink tool. Any recommendations would be appreciated.
What are the energy storage devices which has round trip efficiency >90%, specific energy >300 Wh/kg, energy density >800 Wh/l, power density 1 kW/l, cycle life >5000 and cost < $ 200/kWh at individual cell or device and <$ 300/kWh at system level.
What would be the future trends of solar and energy storage for large-scale asset management for improved reliability, increased revenue, higher energy cost reduction and better asset life extension?
In a battery energy storage system, if we know the number of cycles i.e. charging and discharging how do we calculate the degradation from this.
In the context of the increasing scale of the energy and climate crisis, mainly renewable and zero-carbon energy sources will be developed in the future, which mainly include hydrogen energy and fusion-based energy. This raises the following question:
What are the opportunities for the development of zero-carbon hydrogen and/or fusion-based energy?
What are the possibilities for hydrogen energy applications in powering motor vehicles, cars, aircraft, etc. and supplying buildings and industrial plants with electricity and heat from hydrogen and/or fusion-based energy?
What technologies still need to be improved and developed so that zero-carbon hydrogen and/or fusion-based energy can rapidly become widespread and dominant energy sources?
What is your opinion on the subject?
What do you think about this topic?
I invite you all to discuss,
Thank you very much,
What are ways to save energy?
How can electricity and/or heat consumption be reduced?
How can electricity and/or heat be saved during the climate crisis?
An energy crisis is currently developing in many countries. In some countries, energy is still largely based on burning fossil fuels. Fossil fuel and electricity prices are now rising rapidly. Fossil fuels may run out in the coming autumn/winter season. In the country where I operate, the development of renewable energy sources has been slowed down over the past three decades. As a result, three quarters of electricity is still generated by combustion-based power generation based on burning fossil fuels. Therefore, now that an energy crisis has emerged and the scale of the climate crisis is gradually increasing, a problem has arisen. The risk of a deep energy crisis is high because the scale of diversification of energy sources is low, renewable and carbon-free energy sources are hardly developed and fossil fuel prices are rising. In addition, every year the government subsidises many billions of PLN to unprofitable coal mines and supports monopolistically operating power plants where this coal is burned. This is because the largest companies in the mining and energy sectors are government-controlled state-owned companies, and the employees of these businesses are important electorates for the government in parliamentary elections. These monopoly companies in the energy and refining sector have earned extra money from CO2 emissions rights trading, which, according to European Union guidelines, should have been used to support the development of renewable and emission-free energy sources. Unfortunately, the government did not allocate these funds to the development of renewable energy. In addition, the issue of diversification of energy sources has also been neglected by decision-makers, yet the issue of diversification of energy sources is one of the key factors of energy security. For example, plans to build the first nuclear power plant had already been in place for half a century in Poland. Several successive previous government teams planned the construction of the first nuclear power plant and, unfortunately, only these plans ended. At present, there is still not a single nuclear power plant in Poland and the rate of development of renewable and emission-free energy sources is slow due to the laws that have been in place for the last seven years restricting the development of renewable energy. This type of short-sighted, anti-social, anti-environmental, anti-climate, etc. energy policy has led to a situation where there is a high risk of a deep energy crisis. Citizens already know how serious the mistakes were made by the government in previous years in climate policy. Unfortunately, it will not be possible to rectify all these mistakes in a few months, to rectify the omissions made earlier, to build a nuclear power plant and to develop wind, solar, hydro, geothermal and the most modern and zero-emission hydrogen and fusion-based energy technology on a large scale. Consequently, the government offers subsidies to citizens for the purchase of more expensive hard coal and thus continues to support the development of combustion-based energy and also creates another pro-inflationary factor in this way. Citizens have therefore come to the conclusion that they have to deal with the energy crisis themselves. Consequently, one of the key questions that many people are looking for answers to is how can electricity and/or heat be saved during the climate crisis?
What do you think about this?
What is your opinion on this subject?
I invite you all to discuss,
Thank you very much,
I am looking for examples of using home energy storage to reduce energy peaks on a daily basis in the case of PV. There is a need to use many home energy storage (several hundred thousand in Poland) to cut PV energy peaks.
I searched through many types of literature and planned something based on my investigation.
I plan to predict the IV characteristic curve based on experimental data. Since the curve is usually not linear, I plan to use the SVM algorithm for it.
I plan to predict the power output of fuel cell systems/battery technology as well. Since a lot of factors influence the output power, I am considering using the ANN algorithm to predict the power output with at least 30 epochs.
My ultimate objective is to create a digital twin of a fuel cell system. I was wondering if the algorithms I was planning to use would make sense given the sort of experimental data I would have. Will you also recommend another machine learning algorithm that you believe is more feasible?
Integrating the BESS next to a wind farm to address the wind energy forecast errors.
I started working on 2D hybrid materials to develop energy storage devices. I want to know the working principle/methodology of such materials.
Hello everyone, I am looking for a good MPC quadratic optimization mathematical model to optimize a cost function or performance index, for a battery energy storage state space model. Would anybody suggest a good research paper or post a formulation that contains a good mathematical model for quadratic optimization? An objective function with viable constraints, which can be possible to implement in function solvers such as quadprog or cplex would be ideal. Thank you
For a certain storage device, if round-trip efficiency equals 80%, what are charge efficiency and discharge efficiency?
For a study about an energy storage system for an offshore platform, we need a load profile or a power consumption curve of the platform (i.e. required power or power consumption vs time). I found something useful but it is data a land-based oil rig and the data is for 3 days which makes the figure difficult to extract the data (in the attachment).
Many thanks in advance.
why discharge time is obviously shorter than the charge time for most of the supercapacitors? What is the phenomenon behind this?
Unfortunately, this simplistic vision of RF and microwave circuit design often becomes blurred when test results are obtained that differ drastically from the beautiful simulation results. The reasons for this disparity may normally be traced to one of the following:
"The ratio of the transverse dimensions of transmission lines to wave length are nonnegligible thus, additional unwanted energy storage modes become available."
I read this above paragraph in a textbook, and didn't quite understand the sentence given in bold.
As of how does the above condition result in unwanted energy storage modes.
Thank you in advance
For electrochemical energy storage devices, if battery is considered to specially design for high energy and supercapacitor is considered to specially design for high power, then how to design a device specially for high safety from scratch to adress the safety issues?
Hello . I am a master student in renewable energy and e-mobility and I have an idea to write my thesis on liquid air energy storage but I do not know on what I will be focusing on. Can you please help me to find an area of research on this topic. Thanks
I am looking for a scientific explanation for the mass balancing equation (eq. 1) used in supercapacitors.
1. How the mass balancing could be decided before preparing the electrodes?
2. In which scenario is it required to use the mass balancing and why?
The mass balancing equation:
m+/m- =(C-×∆V-)/(C+×∆V+) (eq. 1)
where m+ and m− is the mass of active material in positive and negative electrodes, C+ and C−is the specific capacitance of the positive and negative electrodes, ΔV+ and ΔV−is the potential window of the positive and negative electrodes.
I am starting to learn how to model an energy storage system for a wind farm. Would anybody know where to look for already existing program model optimizations in Matlab, Gurobi, Gams, ....ect. This is basically just so I can get a general feel of how it is going to work. Any suggestions will be appreciated.
Power Network Expansion Planning is the problem of deciding the new transmission lines that should be added to an existing transmission network in order to satisfy system objectives efficiently. It is one of the main strategic decisions in power systems and has a deep, long-lasting impact on the operation of the system. Several challenges such as deregulation, renewable penetration, large-scale generation projects, market integration, and regional planning are discussed in the literature to some extent.
In the context of the smart grid, what can be the potential future challenges in terms of different scenarios, applications, modeling, solution, and novel devices in the network?
I want to model an energy storage system that with given data levels power consumption. Where should I start looking to learn on how to create one? And most importantly, what would be the best optimization software to use for modeling my problem? Matlab optimization tools, GAMS or Gurobi? Any suggestions would be appreciated
Can we store the electrical energy produced by PEM fuel cells? Maybe stack of them. If so, how do you design the energy storage using a battery or something?
What is the maximum power capacity of a supercapacitor (eg 112V, 8F, rint = 64 mohm)? Is there any connection between the Ragone plot of different energy storage devices and maximum power handling capacity? If possible, share some references.
Thanks in advance
I'm looking to buy some carbon fiber cloth to use as substrate for binder-free, standalone S cathodes. Previously I used activated carbon cloth manufactured by Kynol. However, the fibers of their carbon cloth are too thick and the pores are almost all unorganized micropores.
My PI told me he recently read some commercialized CNT/graphene organized micro/meso-porous carbon cloth. I have not found it but would really appreciate if anyone can provide such vendors and/or more details. Thank you.
The energy storage can be done with different technologies, e.g. batteries, concrete towers, pump hydro systems, flywheel, etc. How long these technologies can hold the energy stored, it is hours, days, weeks, months?
For example, once the energy is charged in the batteries, this gets fully charged, if we leave the batteries fully charged how long will the batteries stay charged, and what are the losses associated with this?
Similarly for the other energy storage technologies, how long this energy storage tile would be?
There are some methods to estimate these characteristics or recommended sources of information?
i am currently doing masters in Electrical engineering. as i am new in research so i dont know much about software and how to read and apply a base paper. i am currently studying BESS , their allocation and different approaches. i have read " Category-Based Multiobjective Approach for Optimal Integration of Distributed Generation and Energy Storage Systems in Distribution Networks" and i want to take this as my base paper for research. but i didn't got much from it as i am not clear about the algorithm and planning and programming used in it. can any one help me on this or help me getting its programming or contacting to its authors.?
In the electrochemical energy storage field, more precicely the battery field, what would be the best use for "insertion" and "intercalation"? either speaking about the materials themselves or the actual process. Thanks for sharing your thoughts!
From a technical point of view, although lithium electric energy storage is in the limelight at present, it may be impacted by more emerging energy storage routes due to its lack of safety. What kind of route is the most consistent with the development of national energy storage? There is no doubt that safety is the primary consideration. VRFB without explosion and fire hazard is expected to become the preferred technology for large-scale energy storage.VRFB is a kind of battery with the same distinct advantages and disadvantages. It is not difficult to find through detailed comparison that VRFB is the most suitable for energy storage equipment, and it is not too much to say that it is born for energy storage. In terms of market share, the market penetration rate of VRFB is less than 1%. However, in the next few years, VRFB is expected to usher in the outbreak, and the market optimism is expected to reach 20% by 2025, and it will reach 30% in 2030.
At present, vanadium redox flow batteries are mainly applied to large-scale energy storage and provide a solution for power smoothing of solar renewable energy. With the proposal of the dual carbon goal, in order to expand its application fields, smart grid, zero-carbon community and other applications have emerged. I would like to ask how vanadium liquid flow battery is applied in the field of new energy vehicles and whether there are any application cases at present.
Hi everybody, to give a little bit of context, I'm looking into the use of hydrogen for long term energy storage.
I'm reading a lot about using hydrogen turbines for re-generation of electricity. From my understanding fuel cells have a way better efficiency than hydrogen turbines. (fuel cell = ~60-70% efficiency vs. hydrogen turbine = ~30-40% efficiency)
Now what I can think of why using hydrogen turbines instead of fuel cells is because you can reach a higher temperature for CHP. But that's just a guess and I couldn't find a really good explanation yet.
Would be happy if anyone can recommend a good paper or anything which explains why using a hydrogen turbine instead a fuel cell.
I'm modelling my own grid in matpower to calculate the optimal power flow (opf). The thing is my grid has WT, PV & storage system in them along with the conventional generators.Does anyone know how to include the Energy Storage System in the code? And how can I include the charging and the discharging?
I am fabricating activated carbon from biowaste like peanut shell for supercapacitor applications. Literature shows that all calcination are doing under inert atmosphere and not normal calcination. We dont have facility to do calcination under inert atmosphere. Will it affects the result if I go for calcination without providing inert atmosphere
The concrete contains phase change material and thermal couples inserted in the concrete at different thicknesses. The objective of the study is to quantify how much energy the samples can store.
I am using the equations developed by M. Pomerantz, B. Pon, H. Akbari, and S.C. Chang "The Effect of Pavements' Temperatures on Air Temperatures in Large Cities" April 2000
Which is similar to Energy storage (W/m2) = radiation + convection - conduction.
I am trying to implement the thermodynamic model of ejector assisted compressed air energy storage (CAES) and I need thermodynamic properties of Therminol 66 thermal oil. In the reference paper, I am following, the author utilized Refprop 9.1, but I can seems to find the the Fluid "therminol 66" in the Refprop fluid library. Does it have any other name in the Refprop library?. If anyone has any idea please guide.
Hi everyone. I am looking for a high temperature MPCM.
More specifically, I need the thermo physical properties of a microencapsulated phase change material with the melting temperature between 580K to 640K.
Is there any commercial MPCM with the mentioned melting temperature? Or any reliable correlation to calculate the properties of the MPCM?
i work with a microgrid that contains a battery and a supercapacitor, i want to estimate the SOC of the battery ( modeled by a DC voltage source with an internal resistance ) according to the Coulomb counting method and therefore i need to select the initial SOC of my battery.\
i take the dimension of my battery from a paper where they say that the rated voltage is 48 V and they took the 28 V (as operational or nominal voltage), so since we use it in 28 V and its rated voltage is 48 V can we say that we use it not fully charged at the initial state ?
and how can i fix for ex my initial SOC at a specified value (50,70%..)
thank you in advance
In general if we want to increase the specific capacitance or charge storage capacity in electrochemical energy storage devices we should have the pore size of the electrode material is slightly higher then the solvated ion size of the electrolyte for easily charging and discharging. If we have the pore size less then the solvated ions of the electrolytes. Can we enhance the parameter if yes How?
In the transportation sector (Electric vehicles), Lithium ion batteries particularly LFP and NMC are the most utilized battery packs today! What are the other expected options within Lithium-ion or other options could be possibly used in the future?
In particular, areas/issues that have potential to be of national/international importance.
I want to have these components in a hybrid renewable energy system (energy storage (thermal energy storage or CAES), solar collector or solar PV, solar reactor, wind turbine, CCHP plant, biomass boiler, etc.) Exergy and energy analysis is going to be performed in my project, Thanks for your participation.