Electrochemical characterizations of commercial LiCoO2 powders with surface modified by Li3PO4 nanoparticles

被引：49

作者：

Jin, Y ^{[1
]}

Li, N

Chen, CH

Wei, SQ

机构：

[1] Univ Sci & Technol China, Dept Mat Sci & Engn, Anhua 230026, Peoples R China

[2] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Anhua 230026, Peoples R China

来源：

ELECTROCHEMICAL AND SOLID STATE LETTERS | 2006年 / 9卷 / 06期

关键词：

D O I：

10.1149/1.2188081

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Through a simple mechanical mixing and heating treatment, the surface of commercial LiCoO2 particles was modified by forming a phosphorus-containing surface layer. X-ray diffraction results proved that no second crystalline phase was present after modification. X-ray absorption near edge structure showed that the valence of Co ions decreased with increased heat-treatment temperature. A higher 3.6 V plateau efficiency was observed for the modified powders. Between 2.8 and 4.5 V, the modified powders showed significantly better capacity retention than pristine LiCoO2. After heat-treatment at the optimal temperature of 450 degrees C, the modified LiCoO2 can deliver a reversible 1 C-rate capacity of 164 mAh/g after 50 cycles.

引用

页码：A273 / A276

页数：4

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