Tris (pentafluorophenyl) phosphine: An electrolyte additive for high voltage Li-ion batteries

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• 作者：Mengqing Xu^a ; ^b ; ^c ; Yanlin Liu^a ; Bin Li^a ; Weishan Li^a ; ^b ; ^c ; ^{liwsh@scnu.edu.cn} ; Xiaoping Li^a ; ^b ; ^c ; Shejun Hu^a ; ^b ; ^c
• 关键词：Tris (pentafluorophenyl) phosphine ; Additive ; High voltage ; Li-ion battery
• 刊名：Electrochemistry Communications
• 出版年：2012
• 期刊代码：29_13882481
• 类别：ch
• 出版时间：2012
• 卷：18
• 期：Complete
• 页码：123-126
• 文件大小：472 K

摘要

Tris (pentafluorophenyl) phosphine (TPFPP) is used as an electrolyte additive to improve the cycling performance of high voltage (~ 5 V) lithium-ion battery. The electrochemical behaviors and surface chemistry of LiNi_0.5Mn_1.5O₄ are investigated via cyclic voltammetry, chronoamperometry, charge-discharge test, X-ray photoelectron spectroscopy, and theoretical computations. It is found that the cycling performance of the cell Li/LiNi_0.5Mn_1.5O₄, using an electrolyte of 1.0 M LiPF₆ in ethylene carbonate/dimethyl carbonate/diethyl carbonate (1/1/1, in volume), can be improved by adding TPFPP into the electrolyte. The theoretical calculations predict that TPFPP is preferably oxidized compared to the solvents. Electrochemical measurements and XPS analyses show that a protective film is formed on LiNi_0.5Mn_1.5O₄ when TPFPP is used, which contributes to the cycling performance improvement of the cell.