衰退
电解质
阴极
衍射
化学
磁滞
分析化学(期刊)
离子
自行车
材料科学
物理
光学
电极
物理化学
电气工程
色谱法
有机化学
频道(广播)
工程类
历史
考古
量子力学
作者
Kyung Yoon Chung,Hung Sui Lee,Won‐Sub Yoon,J. McBreen,Xiao‐Qing Yang
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2006-01-01
卷期号:153 (4): A774-A774
被引量:59
摘要
Using in situ X-ray diffraction, the capacity fading mechanism of under various conditions has been studied. The capacity fading can be monitored by the structural changes during cycling. At the beginning of cycling, the structural changes closely follow the charge-discharge curve: the main structure starts in cubic I, transfers to cubic II, and ends as cubic III during charge, and reverses the course during discharge. These phase transitions track the charging and discharging curves with small hysteresis. However, with an increased amount of capacity fading during cycling, the structural changes deviate from the charge-discharge curve: Bragg peaks representing cubic I and II remain present at the end of charge, when the whole cathode should have been transferred to cubic III. Similarly, the residues of cubic II and III were observed at the end of discharge. The amount of residues increases with increasing capacity fading by cycling at , overcharging to , or after multiple cycling at normal condition. Adding a tris(pentafluorophenyl) borane (TPFPB) compound in electrolyte can reduce the residues and washing the cathode with solvent can partially restore the lost capacity in the subsequent cycling, showing the important role of electrolyte decomposition in capacity fading.
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