Vinyl-functionalized imidazolium ionic liquids as new electrolyte additives for high-voltage Li-ion batteries

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• 作者：ZhongNi Wang ; YingJun Cai ; ZhiHua Wang…
• 关键词：Ionic liquid ; Additive ; Electrolyte ; Electroinitiated polymerization ; High ; voltage ; Li ; ion battery
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2013
• 出版时间：November 2013
• 年：2013
• 卷：17
• 期：11
• 页码：2839-2848
• 全文大小：824KB
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• 作者单位：ZhongNi Wang (1) (2)
  YingJun Cai (1)
  ZhiHua Wang (1)
  ShiMou Chen (1)
  XingMei Lu (1)
  SuoJiang Zhang (1)
  
  1. Beijing Key Laboratory of Ionic Liquids Clean Process, Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
  2. College of Chemistry and Chemical Engineering, Graduate University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China
  
• ISSN：1433-0768

文摘

Four functionalized ionic liquids based on imidazolium cations with vinyl or alllyl group and TFSI?/sup> anion were synthesized as electrolyte additives for high-voltage Li-ion battery to stabilize carbonate-based electrolytes on the surface of 5?V class cathode materials. The electrochemical behaviors and surface morphology of LiNi0.5Mn1.5O4 cathode had been investigated by cyclic voltammetry, charge–discharge test, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM), respectively. Cycle life and rate performance of the Li/LiNi0.5Mn1.5O4 cells containing 1.2?M LiPF6 in ethylene carbonate/ethyl methyl carbonate can be improved by adding 1-allyl-3-vinyl imidazolium bis(trifluoromethanesulphonyl)imide ([AVIm][TFSI]). The addition of 3?wt.% [AVIm][TFSI] results in high discharge capacity of above 130?mAh?g?. Surface analysis of the cathode material (XPS and SEM) suggested that a stable and compact polymer film was formed on the LiNi0.5Mn1.5O4 cathode by electroinitiated polymerization of imidazolium cation with vinyl and allyl group.