石墨
电极
电池(电)
接口(物质)
离子
材料科学
化学工程
无机化学
复合材料
化学
有机化学
工程类
物理
热力学
物理化学
功率(物理)
毛细管数
毛细管作用
作者
Meiling Xu,Xinbing Zuo,W.S. Li,Hong Zhou,Jun‐Min Liu,Zhengqiu Yuan
出处
期刊:Acta physico-chimica Sinica
[Acta Physico-Chimica Sinica & University Chemistry Editorial Office, Peking University]
日期:2006-03-01
卷期号:22 (3): 335-340
被引量:19
标识
DOI:10.1016/s1872-1508(06)60009-0
摘要
Abstract The effect of butyl sultone (BS) on the graphite interface of a lithium ion battery in carbonate-based electrolytes was studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), as well as density functional theory (DFT) calculation. The results indicate that BS has a lower LUMO energy than the solvents and is reduced prior to solvent compositions of the electrolyte on a graphite electrode, forming a stable solid electrolyte interface (SEI) film during the first cycle. The SEI film resistance and the charge-transfer resistance of the graphite electrode in BS containing solution changed little after storage at 70 °C for 24 h, while those in BS free solution increased significantly. The influence of BS on the electrochemical performance was also discussed. It was found that the discharge capacities were significantly improved at room temperature, low temperature, and after high temperature storage, on account of the presence of BS.
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