期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 151, 期 9, 页码 A1344-A1351出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.1772781
关键词
-
Using a commercial available LiCoO2 as starting material, surface-modified cathode material was obtained by coating its surface with a nanosize layer of amorphous Al2O3. Electrochemical performances and structural evolutions of the modified cathode material were characterized and compared with that of pristine LiCoO2. Specific capacity of 190 mAh/g was obtained in Li/ (Al2O3-coated LiCoO2) experimental cells when charged to 4.5 V. The relationship between the structural evolution and the electrochemical performances at overcharged state was investigated using in situ synchrotron X-ray diffraction (XRD). After charging the half-cell using uncoated LiCoO2 as cathode, the variation of the c value in hexagonal structure is significantly reduced during subsequent cycles. This reduction in c variation range is concurrently related to the capacity fading. In contrast, the variation range of c is preserved in the Al2O3-coated cathodes, and so is capacity. Based on these results, a capacity fading mechanism of LiCoO2-type cathode materials after overcharge is proposed, and an explanation of the surface coating effects is given. (C) 2004 The Electrochemical Society.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据