Electrochemical and in situ synchrotron XRD studies on Al2O3-coated LiCoO2 cathode material

被引:108
作者
Liu, LJ
Chen, LQ
Huang, XJ
Yang, XQ
Yoon, WS
Lee, HS
McBreen, J
机构
[1] Chinese Acad Sci, Inst Phys, Nanoscale Phys & Devices Lab, Beijing 100080, Peoples R China
[2] Brookhaven Natl Lab, Upton, NY 11973 USA
关键词
D O I
10.1149/1.1772781
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
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.
引用
收藏
页码:A1344 / A1351
页数:8
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