共查询到20条相似文献，搜索用时 16 毫秒
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Dr. Nian‐Wu Li Yang Shi Dr. Ya‐Xia Yin Dr. Xian‐Xiang Zeng Jin‐Yi Li Prof. Cong‐Ju Li Prof. Li‐Jun Wan Prof. Rui Wen Prof. Yu‐Guo Guo 《Angewandte Chemie (International ed. in English)》2018,57(6):1505-1509
Lithium (Li) metal is a promising anode material for high‐energy density batteries. However, the unstable and static solid electrolyte interphase (SEI) can be destroyed by the dynamic Li plating/stripping behavior on the Li anode surface, leading to side reactions and Li dendrites growth. Herein, we design a smart Li polyacrylic acid (LiPAA) SEI layer high elasticity to address the dynamic Li plating/stripping processes by self‐adapting interface regulation, which is demonstrated by in situ AFM. With the high binding ability and excellent stability of the LiPAA polymer, the smart SEI can significantly reduce the side reactions and improve battery safety markedly. Stable cycling of 700 h is achieved in the LiPAA‐Li/LiPAA‐Li symmetrical cell. The innovative strategy of self‐adapting SEI design is broadly applicable, providing opportunities for use in Li metal anodes 相似文献
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The current Highlight emphasizes the significance of a recently published Nature paper (Nature 2019 , 572, 511–515) and sheds light onto future research activities on Li anodes, for example, the solid electrolyte interphase Li, the dead Li, the morphology of the electrodeposited Li, as well as the correlation between the dead Li and battery performance degradation. 相似文献
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锂离子电池有机电解液材料研究进展 总被引：4，自引：0，他引：4
综述了锂离子电池有机电解液材料的研究现状。锂离子电池有机电解液主要由电解质锂盐、有机溶剂和添加剂三个部分组成,新型电解质锂盐的研究开发可分为三个方面：（1）LiTFSI及其类似物;（2）络合硼酸锂化合物;（3）络合磷酸锂化合物。有机溶剂的研究工作主要集中在新型有机溶剂的开发上。最重要的添加剂主要有三类：（1）主要用以改善碳负极SEI膜性能的添加剂;（2）过充电保护添加剂;（3）配体添加剂。 相似文献
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Dr. Charl J. Jafta Dr. Craig A. Bridges Dr. Yaocai Bai Dr. Linxiao Geng Bishnu P. Thapaliya Dr. Harry M. Meyer III Dr. Rachid Essehli Dr. William T. Heller Dr. Ilias Belharouak 《ChemSusChem》2020,13(14):3654-3661
The formation of a solid–electrolyte interphase (SEI) on the surface of Li4Ti5O12 (LTO) has become a highly controversial topic, with arguments for it and against it. However, prior studies supporting the formation of an SEI layer have typically suggested that a layer forms upon cycling of a cell, although the layer is probed after disassembling. In this study, cubic mesostructured LTO is synthesized with crystallite domain sizes between 3 and 4 nm and uniform pores with diameters ≤8 nm. The mean pore size is controlled between 4–8 nm through the use of a triblock amphipathic copolymer with a tunable hydrophobic block as template and by thermal treatment. The LTO morphology obtained is spherical and evolves upon heat treatment. These materials show excellent electrochemical performance, including high rate capability and capacity retention. The LTO material is subjected to operando small-angle neutron scattering and X-ray photoelectron spectroscopy experiments, which reveal that the highly debated SEI forms at potentials as high as 2.2 V, first as a LiF-rich layer and subsequently by the growth of a carbonaceous layer. These SEI products form first on the smaller pores before forming on the mesopores. 相似文献
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Tao Yu Jinliang Liu Hongming Zhang Shiyou Li Xiaoling Cui Huixia Feng Yangyu Zhao Haining Liu Faqiang Li 《Surface and interface analysis : SIA》2014,46(1):48-55
To discuss the source of sulfolane (SL) in decreasing the interface resistance of Li/mesophase carbon microbeads cell with lithium bis(oxalate)borate (LiBOB)‐based electrolyte, the morphology and the composition of the solid electrolyte interphase (SEI) layer on the surface of carbonaceous anode material have been investigated. Compared with the cell with 0.7 mol l?1 LiBOB‐ethylene carbonate/ethyl methyl carbonate (EMC) (1 : 1, v/v) electrolyte, the cell with 0.7 mol l?1 LiBOB‐SL/EMC (1 : 1, v/v) electrolyte shows better film‐forming characteristics in SEM (SEI) spectra. According to the results obtained from Fourier transform infrared spectroscopy, XPS, and density functional theory calculations, SL is reduced to Li2SO3 and LiO2S(CH2)8SO2Li through electrochemical processes, which happens prior to the reduction of either ethylene carbonate or EMC. It is believed that the root of impedance reduction benefits from the rich existence of sulfurous compounds in SEI layer, which are better conductors of Li+ ions than analogical carbonates. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
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锂离子电池有机电解液成膜添加剂研究进展 总被引：8，自引：0，他引：8
综述了锂离子电池有机电解液成膜添加剂的作用原理,从气体、液体、固体成膜添加剂三个方面综述了目前成膜添加剂的研究现状。重点论述了每一种添加剂的作用原理以及在碳负极上的还原机理,同时对它们的优缺点也作了适当的评述。 相似文献
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Li−O2 batteries with extremely high theoretical energy density have garnered great attention over the last decade. To realize practical applications, numerous efforts have been made to solve the critical problems. Li anodes, as one of the most important part of Li−O2 batteries, play a vital role in improving the cycle life of batteries. The unresolved issues related to lithium dendrites and contaminant (O2 and H2O) crossover from cathodes to anodes dramatically influence the battery performance. In this review, we analyze the challenging issues of Li anodes in Li−O2 batteries and summarize the strategies to achieve high performance of Li−O2 batteries and the recent progress in this field. The prospective development of highly stable Li anodes is also discussed. 相似文献
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The capacity fade of modern lithium ion batteries is mainly caused by the formation and growth of the solid–electrolyte interphase (SEI). Numerous continuum models support its understanding and mitigation by studying SEI growth during battery storage. However, only a few electrochemical models discuss SEI growth during battery operation. In this article, a continuum model is developed that consistently captures the influence of open-circuit potential, current direction, current magnitude, and cycle number on the growth of the SEI. The model is based on the formation and diffusion of neutral lithium atoms, which carry electrons through the SEI. Recent short- and long-term experiments provide validation for our model. SEI growth is limited by either reaction, diffusion, or migration. For the first time, the transition between these mechanisms is modelled. Thereby, an explanation is provided for the fading of capacity with time t of the form tβ with the scaling coefficent β, 0≤β≤1. Based on the model, critical operation conditions accelerating SEI growth are identified. 相似文献
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Santner HJ Korepp C Winter M Besenhard JO Möller KC 《Analytical and bioanalytical chemistry》2004,379(2):266-271
Lithium-ion batteries operate beyond the thermodynamic stability of the aprotic organic electrolyte used and electrolyte decomposition occurs at both electrodes. The electrolyte must therefore be composed in a way that its decomposition products form a film on the electrodes which stops the decomposition reactions but is still permeable to the Li(+) cations which are the charge carriers. At the graphite anode, this film is commonly referred to as a solid electrolyte interphase (SEI). Aprotic organic compounds containing vinylene groups can form an effective SEI on a graphitic anode. As examples, vinyl acetate (VA) and acrylonitrile (AN) have been investigated by in-situ Fourier transform infrared (FTIR) spectroscopy in a specially developed IR cell. The measurements focus on electrolyte decomposition and the mechanism of SEI formation in the presence of VA and AN. We conclude that cathodic reduction of the vinylene groups (i.e., via reduction of the double bond) in the electrolyte additives is the initiating and thus a most important step of the SEI-formation process, even in an electrolyte which contains only a few percent (i.e. electrolyte additive amounts) of the compound. The possibility of electropolymerization of the vinylene monomers in the battery electrolytes used is critically discussed on the basis of the IR data obtained. 相似文献
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Dong-Joo Yoo Sungyun Yang Prof. Ki Jae Kim Prof. Jang Wook Choi 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(35):14979-14986
In lithium metal batteries, electrolytes containing a high concentration of salts have demonstrated promising cyclability, but their practicality with respect to the cost of materials is yet to be proved. Here we report a fluorinated aromatic compound, namely 1,2-difluorobenzene, for use as a diluent solvent in the electrolyte to realize the “high-concentration effect”. The low energy level of the lowest unoccupied molecular orbital (LUMO), weak binding affinity for lithium ions, and high fluorine-donating power of 1,2-difluorobenzene jointly give rise to the high-concentration effect at a bulk salt concentration near 2 m , while modifying the composition of the solid-electrolyte-interphase (SEI) layer to be rich in lithium fluoride (LiF). The employment of triple salts to prevent corrosion of the aluminum current collector further improves cycling performance. This study offers a design principle for achieving a local high-concentration effect with reasonably low bulk concentrations of salts. 相似文献
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Dong‐Joo Yoo Sungyun Yang Ki Jae Kim Jang Wook Choi 《Angewandte Chemie (International ed. in English)》2020,59(35):14869-14876
In lithium metal batteries, electrolytes containing a high concentration of salts have demonstrated promising cyclability, but their practicality with respect to the cost of materials is yet to be proved. Here we report a fluorinated aromatic compound, namely 1,2‐difluorobenzene, for use as a diluent solvent in the electrolyte to realize the “high‐concentration effect”. The low energy level of the lowest unoccupied molecular orbital (LUMO), weak binding affinity for lithium ions, and high fluorine‐donating power of 1,2‐difluorobenzene jointly give rise to the high‐concentration effect at a bulk salt concentration near 2 m , while modifying the composition of the solid‐electrolyte‐interphase (SEI) layer to be rich in lithium fluoride (LiF). The employment of triple salts to prevent corrosion of the aluminum current collector further improves cycling performance. This study offers a design principle for achieving a local high‐concentration effect with reasonably low bulk concentrations of salts. 相似文献
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Chen Zhao Dr. Gui-Liang Xu Dr. Tianshou Zhao Dr. Khalil Amine 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(40):17787-17793
Electrolyte modulation simultaneously suppresses polysulfide the shuttle effect and lithium dendrite formation of lithium–sulfur (Li-S) batteries. However, the sluggish S redox kinetics, especially under high S loading and lean electrolyte operation, has been ignored, which dramatically limits the cycle life and energy density of practical Li-S pouch cells. Herein, we demonstrate that a rational combination of selenium doping, core–shell hollow host structure, and fluorinated ether electrolytes enables ultrastable Li stripping/plating and essentially no polysulfide shuttle as well as fast redox kinetics. Thus, high areal capacity (>4 mAh cm−2) with excellent cycle stability and Coulombic efficiency were both demonstrated in Li metal anode and thick S cathode (4.5 mg cm−2) with a low electrolyte/sulfur ratio (10 μL mg−1). This research further demonstrates a durable Li-Se/S pouch cell with high specific capacity, validating the potential practical applications. 相似文献
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Shuang-Yan Lang Yang Shi Xin-Cheng Hu Hui-Juan Yan Rui Wen Li-Jun Wan 《Current Opinion in Electrochemistry》2019
High energy density batteries are urgently required for sustainable life. The intrinsic understanding of the reaction mechanism at the interfaces is essential for the progress. In this short overview, recent advances in rechargeable batteries by in situ atomic force microscopy are summarized, providing nanoscale information on the solid product evolution and metal plating/stripping inside working batteries. Besides, the multifunctional imaging of the morphology along with mechanical and electrical properties can be achieved to assist further interfacial design. Extensive applications of in situ atomic force microscopy are encouraged to explore the electrochemical mechanism and advanced engineering. 相似文献
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Xiaofeng He Xiao Liu Qing Han Peng Zhang Xiaosheng Song Yong Zhao 《Angewandte Chemie (International ed. in English)》2020,59(16):6397-6405
A proof‐of‐concept study on a liquid/liquid (L/L) two‐phase electrolyte interface is reported by using the polarity difference of solvent for the protection of Li‐metal anode with long‐term operation over 2000 h. The L/L electrolyte interface constructed by non‐polar fluorosilicane (PFTOS) and conventionally polar dimethyl sulfoxide solvents can block direct contact between conventional electrolyte and Li anode, and consequently their side reactions can be significantly eliminated. Moreover, the homogeneous Li‐ion flow and Li‐mass deposition can be realized by the formation of a thin and uniform solid‐electrolyte interphase (SEI) composed of LiF, LixC, LixSiOy between PFTOS and Li anode, as well as the super‐wettability state of PFTOS to Li anode, resulting in the suppression of Li dendrite formation. The cycling stability in a lithium–oxygen battery as a model is improved 4 times with the L/L electrolyte interface. 相似文献