Xiqian Yu

Xiqian Yu
Chinese Academy of Sciences | CAS · Clean Energy

Ph D

About

307
Publications
115,678
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31,193
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Introduction
Xiqian Yu currently works at the Clean Energy, Chinese Academy of Sciences. Xiqian does research in Materials Science. Their current project is 'rechargeable batteries.'
Additional affiliations
July 2005 - July 2010
Institute of Physics, Chinese Academy of Sciences
Position
  • PhD Student

Publications

Publications (307)
Article
A novel in situ X-ray fluorescence microscopy combined with X-ray absorption spectroscopy technique is reported to investigate the Li–S batteries during electrochemical cycling. The evolution of morphology changes of the electrode is monitored in real time using the X-ray fluorescence images, while the changes of the sulfur chemical state are chara...
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The aqueous sodium-ion battery system is a safe and low-cost solution for large-scale energy storage, because of the abundance of sodium and inexpensive aqueous electrolytes. Although several positive electrode materials, for example, Na0.44MnO2, were proposed, few negative electrode materials, for example, activated carbon and NaTi2(PO4)3, are ava...
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The high-energy-density, Li-rich layered materials, i.e., xLiMO2 (1- x)Li2MnO3, are promising candidate cathode materials for electric energy storage in plugin hybrid electric vehicles (PHEVs) and electric vehicles (EVs). The relatively low rate capability is one of the major problems that need to be resolved for these materials. To gain insight in...
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Thermal safety remains a critical concern in the commercialization of lithium-ion batteries (LIBs), with extensive research dedicated to understanding the thermal behaviors of cathode materials. While a wealth of thermochemical test data is available in the literature, the variability in sample conditions and experimental testing parameters complic...
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Lithium-rich manganese-based oxide (LRMO) materials hold great potential for high-energy-density lithium-ion batteries (LIBs) but suffer from severe voltage decay and capacity fading. Herein, we report the in-situ construction of LiF-rich...
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Accurate modeling of lithium-ion battery (LIB) electrode microstructures provides essential references for understanding degradation mechanisms and optimizing materials. Traditional segmentation methods often struggle to accurately capture the complex microstructures of porous LIB electrodes in focused ion beam scanning electron microscopy (FIB-SEM...
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With the increasing demand for high-resolution x-ray tomography in battery characterization, the challenges of storing, transmitting, and analyzing substantial imaging data necessitate more efficient solutions. Traditional data compression methods struggle to balance reduction ratio and image quality, often failing to preserve critical details for...
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LiNi0.8Co0.1‐Mn0.1O2 (NMC811) is widely used in high energy density lithium‐ion batteries, while dynamic variation of liquid‐solid interface induced by oxygen release/evolution results in unexpected performance decay. Surface coating is an effective strategy in promoting the stability of NMC811 materials, and both coating composition and nanostruct...
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Operating a lithium‐ion battery (LIB) in a wide temperature range is essential for ensuring a stable electricity supply amidst fluctuating temperatures caused by climate or terrain changes. Electrolyte plays a pivotal role in determining the temperature durability of batteries. However, specialized electrolytes designed for either low or high tempe...
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Lithium cobalt oxide (LiCoO2) is considered an indispensable cathode material in the realm of consumer electronic batteries due to its high volumetric energy density. However, at a charging cut‐off voltage as high as 4.6 V, significant interfacial side reactions between LiCoO2 and the electrolyte occur, which adversely impact the battery's cycle pe...
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Compared to commercial lithium-ion batteries, all-solid-state batteries can greatly increase the energy density, safety, and cycle life of batteries. The development of solid-state electrolyte with high lithium-ion conductivity and wide electrochemical window is the key for all-solid-state batteries. In this work, we report on the achievement of hi...
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Lithium cobalt oxide (LiCoO2) is an irreplaceable cathode material for lithium‐ion batteries with high volumetric energy density. The prevailing O3 phase LiCoO2 adopts the ABCABC (A, B, and C stand for lattice sites in the close‐packed plane) stacking modes of close‐packed oxygen atoms. Currently, the focus of LiCoO2 development is application at h...
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Silicon (Si) is a competitive anode material owing to its high theoretical capacity and low electrochemical potential. Recently, the prospect of Si anodes in solid-state batteries (SSBs) has been proposed due to less solid electrolyte interphase (SEI) formation and particle pulverization. However, major challenges arise for Si anodes in SSBs at ele...
Article
Operating a lithium‐ion battery (LIB) in a wide temperature range is essential for ensuring a stable electricity supply amidst fluctuating temperatures caused by climate or terrain changes. Electrolyte plays a pivotal role in determining the temperature durability of batteries. However, specialized electrolytes designed for either low or high tempe...
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Full-text available
Reasons for abrupt capacity fading in commercial LiNi0.8Co0.1Mn0.1O2 (NCM811)/SiOx-graphite pouch batteries were evaluated using electrochemical methods. These approaches consist of charge and discharge curves, differential curves and electrochemical impedance spectroscopy (EIS), and some advanced verification techniques constituting scanning elect...
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Li/Ni mixing negatively influences the discharge capacity of lithium nickel oxide and high-nickel ternary cathode materials. However, accurately measuring the Li/Ni mixing degree is difficult due to the preferred orientation of lab-based XRD measurements using Bragg–Brentano geometry. Here, we find that employing spherical harmonics in Rietveld ref...
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Battery materials with high-energy density and good safety performance have been regarded as the ultimate target for larger-scale applications of lithium-ion batteries in electric transportation and grid energy storage. Thermal safety of high energy density cathode materials has been a hot topic for battery safety research in recent years. Differen...
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Since the discovery of its electrochemical activity, Li-excess disordered rock-salt (DRX) cathode material has received worldwide attention as it sets up a new way to exploit oxygen redox beyond the...
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Modulating the storage kinetics of Zn2+ through oxygen vacancy (Ov) manipulation represents a promising approach for developing cathode materials in aqueous rechargeable zinc-ion batteries (ZIBs). However, recent studies have shown...
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Li‐rich cation‐disordered rock‐salt (DRX) materials have emerged as promising candidates for high‐capacity oxide cathodes. Their fluorinated variants have shown improved cycling stability with effectively suppressed oxygen loss. However, a comprehensive understanding of how fluorination impacts the multiscale structure and lithium transportation in...
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The binder adheres to each component of the electrode to maintain the structural integrity and plays an irreplaceable role in a battery despite its low content. Polyvinylidene difluoride (PVDF), as the dominant binder in commercial battery systems (for cathodes), has acceptably balanced properties between chemical/electrochemical stability and adhe...
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Prelithiation is an essential technology to compensate for the initial lithium loss of lithium‐ion batteries due to the formation of solid electrolyte interphase (SEI) and irreversible structure change. However, the prelithiated materials/electrodes become more reactive with air and electrolyte resulting in unwanted side reactions and contamination...
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The atom‐cluster interaction has recently been exploited as an effective way to increase the performance of metal‐nitrogen‐carbon catalysts for oxygen reduction reaction (ORR). However, the rational design of such catalysts and understanding their structure‐property correlations remain a great challenge. Herein, we demonstrate that the introduction...
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The atom‐cluster interaction has recently been exploited as an effective way to increase the performance of metal‐nitrogen‐carbon catalysts for oxygen reduction reaction (ORR). However, the rational design of such catalysts and understanding their structure‐property correlations remain a great challenge. Herein, we demonstrate that the introduction...
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Na‐ion batteries (NIBs) are promising for grid‐scale energy storage applications. However, the lack of Co, Ni‐free cathode materials has made them less cost‐effective. In this work, Mg²⁺ is successfully utilized to activate the oxygen redox reaction in earth‐abundant Fe/Mn‐based layered cathodes to achieve reversible hybrid anionic and cationic red...
Article
Cation-disordered rock-salt (DRX) materials receive intensive attention as a new class of cathode candidates for high-capacity lithium-ion batteries (LIBs). Unlike traditional layered cathode materials, DRX materials have a three-dimensional (3D) percolation network for Li+ transportation. The disordered structure poses a grand challenge to a thoro...
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Solid electrolyte interphase (SEI) plays an important role in regulating the interfacial ion transfer and safety of Lithium‐ion batteries (LIBs). It is unstable and readily decomposed releasing much heat and gases and thus triggering thermal runaway. Herein, in situ heating X‐ray photoelectron spectroscopy is applied to uncover the inherent thermal...
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The pursuit of high‐energy‐density lithium‐ion batteries (LIBs) has brought extensive research on the high‐capacity lithium‐rich manganese‐rich oxide cathode (LRMO). However, practical applications of LRMO require a comprehensive understanding of its thermal stability, which determines the boundary for the safe use of LIBs. Here, systematic investi...
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High-energy-density rechargeable lithium batteries are being pursued by researchers because of their revolutionary potential nature. Current advanced practical lithium-ion batteries have an energy density of around 300 Wh kg ⁻¹ . Continuing to increase the energy density of batteries to a higher level could lead to a major explosion development in...
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The ever-growing demand for portable electronic devices has put forward higher requirements on the energy density of layered LiCoO2 (LCO). The unstable surface structure and side reactions with electrolytes at high voltages (>4.5 V) however hinder its practical applications. Here, considering the high-voltage stability and three-dimensional lithium...
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The effects of atmosphere and temperature on the electrochemical reversibility of black phosphorus (BP) anodes were investigated. BP anodes prepared in ambient air exhibited much-enhanced electrochemical activity due to the...
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Sulfide electrolytes with high ionic conductivity and facile formability are expected to replace the conventional flammable liquid electrolyte to construct high-energy and safe all-solid-state batteries (ASSBs). However, the practical use...
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Charge compensation on anionic redox reaction (ARR) has been promising to realize extra capacity beyond transition metal redox in battery cathodes. The practical development of ARR capacity has been hindered by high‐valence oxygen instability, particularly at cathode surfaces. However, the direct probe of surface oxygen behavior has been challengin...
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The highest specific capacity and the lowest potential make the lithium metal anode an ultimate choice of battery anode and thus becoming a hot topic in the battery research community. Extensive efforts are afforded to improve the electrochemical performances of lithium metal anode and encouraging progresses are made to achieve stable cycling of li...
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Charge compensation on anionic redox reaction (ARR) has been promising to realize extra capacity beyond transition metal redox in battery cathodes. The practical development of ARR capacity has been hindered by high‐valence oxygen instability, particularly at cathode surfaces. However, the direct probe of surface oxygen behavior has been challengin...
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In this article, systematic comparison of the safety performance of LiNi x Mn y Co z O 2 is made to find a balance among nickel content, energy density, and thermal stability. Three kinds of LiNi x Mn y Co z O 2 cathodes with different nickel contents are charged to different cut-off voltages from 4.2 to 4.6 V (vs Li ⁺ /Li) to obtain different ener...
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The rapid development of lithium-ion batteries (LIBs) is faced with challenge of its safety bottleneck, calling for design and chemistry innovations. Among the proposed strategies, the development of solid-state batteries (SSBs) seems the most promising solution, but to date no practical SSB has been in large-scale application. Practical safety per...
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Single-crystalline Ni-rich (SCNR) cathode with a large particle size can achieve a high energy density and safety over the polycrystalline counterparts. However, synthesis of large SCNR cathodes (>5 μm) without compromising electrochemical performance is very challenging due to incompatibility between Ni-rich cathodes and high temperature calcinati...
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The low temperature performance is an apparent shortcoming of current lithium batteries, which renders them incompetent for various low temperature application scenarios. Developing low-temperature electrolytes is a facile but effective approach to elevate the performance of lithium batteries at low temperatures. The design of low-temperature elect...
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The addition of [EMIM]NO3 effectively inhibited aluminium current collector corrosion in a LiTFSI-based electrolyte since both [EMIM]+ and NO3- could exclude TFSI- from directly contacting the surface of aluminium current...
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Constructions of high-energy-density lithium-ion batteries (LIBs) largely rely on the breakthrough of cathode materials. In contrast to conventional layered oxide cathodes (LiTMO 2 , TM denotes transition metal), invoking oxygen redox by increasing the chemical ratio of Li/O in oxide cathode can further boost the development of new types of high-ca...
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Batteries are key supporting techniques for energy, information and transportation revolution. Many countries and companies have set up mid-term and long-term plan to promote the scientific and technological research on batteries. This paper summarizes briefly the progresses of batteries in China during 2016–2020 and interesting topics of next five...
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With the continuous expansion of lithium-ion battery production and application scenarios, the safety issue of lithium-ion battery has gradually become prominent, which has attracted extensive attention of the academia and industry. Employing solid electrolyte to replace liquid electrolyte to develop solid-state batteries (SSBs) is expected to impr...
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Silicon–graphite (Si–Gr) composite anodes are attractive alternatives to replace Gr anodes for lithium-ion batteries (LIBs) owing to their relatively high capacity and mild volume change. However, it is difficult to understand electrochemical interactions of Si and Gr in Si–Gr composite anodes and internal polarization of LIBs with regular experime...
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Battery safety concerns are becoming more and more prominent with the increasing demands of lithium‐ion batteries (LIBs) with higher energy density. The greatest threat to battery safety derives from the easy release of oxygen from the high‐capacity layered oxide cathodes at highly delithiated states and subsequent exothermic reactions with reducti...
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Silicon-graphite (Si–C) composite anode is considered as the promising next-generation commercial anode due to its mild volume change and relatively high capacity compared with Si and graphite anode. However, local huge volume expansion of Si–C composite anode during charge leads to a large expansion force of the cell, resulting in safety problems...
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Hard carbon (HC) anodes show conspicuously commercialized potential for sodium-ion batteries (SIBs) due to their cost-effectiveness and satisfactory performance. However, the development of hard carbon anodes in SIBs is still hindered by low initial Coulombic efficiency (ICE) and insufficient cyclic stability, which are induced by inappropriate def...
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Replacing liquid electrolytes (LEs) with polymer electrolytes has been considered a promising approach to developing next‐generation lithium‐ion batteries (LIBs) with high energy density and superior safety. Nevertheless, compared with the extensive research on the electrochemical stability of the cathode/polymer electrolyte interfaces, reports on...
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Manganese could be the element of choice for cathode materials used in large-scale energy storage systems owing to its abundance and low toxicity levels. However, both lithium- and sodium-ion batteries adopting this electrode chemistry suffer from rapid performance fading, suggesting a major technical barrier that must be overcome. Here we report a...
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The desire for high-energy-density batteries calls for the revival of the Li metal anode. However, its application is hindered by enormous challenges associated with Li deposition/desolvation behaviors, such as side reactions, volume change, and dendrite formation. To overcome these challenges, Li deposition must be controlled to remain below the s...
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Li-Rich Cathode Materials In article number 2005937, Qingshui Xie, Xiqian Yu, Dong-Liang Peng, and co-workers review the recent challenges and prospects in Li-rich cathode materials, and the recent understanding of the complex relationships between inherent material issues and external performance degradation. The proposed future opportunities will...
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Lattice defects, e.g., dislocations and grain boundaries, critically impact the properties of crystalline battery cathode materials. A long-standing challenge is to probe the meso-scale heterogeneity and evolution of lattice defects with sensitivity to atomic-scale details. Herein, we tackle this issue with a unique combination of X-ray nanoprobe d...
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Single‐crystalline Ni‐rich cathodes are promising candidates for the next‐generation high‐energy Li‐ion batteries. However, they still suffer from poor rate capability and low specific capacity due to the severe kinetic hindrance at the nondilute state during Li⁺ intercalation. Herein, combining experiments with density functional theory (DFT) calc...