A TEM study of cycled nano-crystalline HT-LiCoO2 cathodes for rechargeable lithium batteries

被引：35

作者：

Choi, SH

Kim, J

Yoon, YS ^{[1
]}

机构：

[1] Konkuk Univ, Dept Adv Fus Technol, Ctr Emerging Wireless Power Transmiss Technol, Seoul 143701, South Korea

[2] Korea Inst Sci & Technol, Nano Mat Res Ctr, Seoul 130650, South Korea

来源：

JOURNAL OF POWER SOURCES | 2004年 / 135卷 / 1-2期

关键词：

transmission electron microscopy; LiCoO2; disordered phase transformation; spinel; capacity fade;

D O I：

10.1016/j.jpowsour.2004.03.067

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

LiCoO2 has alpha-NaFeO2 structure type and it has been reported that layered cation ordering is preserved during repeated insertion and removal of Li+. We have observed, at a nano-particle scale, cation disorder induced in LiCoO2 after prolonged cycling. LiCoO2 cathode powders with nano-grain sized of 70-300 nm were synthesized by a mechano-chemical method. Transmission electron microscopy study of LiCoO2 showed that the initial 03 crystal structure partially transformed to a cubic spinel phase. This spinel phase formation may be responsible for capacity degradation after prolonged cycling of LiCoO2-based rechargeable lithium batteries. Cycle life of small size (70 nm) LiCoO2 powder until 200 cycles is better than that of large size (300 nm) LiCoO2 powder due to shorter diffusion distance. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：286 / 290

页数：5

共 14 条

[1] CoO2, the end member of the LixCoO2 solid solution [J].