TiO2 coating for long-cycling LiCoO2:: A comparison of coating procedures

被引:71
作者
Fey, GTK [1 ]
Lu, CZ
Kumar, TP
Chang, YC
机构
[1] Natl Cent Univ, Dept Chem & Mat Engn, Chungli 32054, Taiwan
[2] Yuan Ze Univ, Dept Chem Engn, Taoyuan 301, Nelli, Taiwan
关键词
coated cathodes; sol-gel coating; mechano-thermal coating; coated LiCoO2; nanoparticles; lithium-ion battery;
D O I
10.1016/j.surfcoat.2005.03.021
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The cycling properties of LiCoO2 coated with TiO2 by a sol-gel process from an alkoxide precursor and a mechano-thermal process from pre-formed nanoparticles are compared. Electron microscopic images of 1.0 wt.% TiO2-coated particles revealed that the oxide formed a compact coating over the cathode particles. XRD studies showed a general decrease in the value of the lattice parameter c upon coating, indicating that substitutional compounds might have formed on the surface during calcination. R-factor values from XRD studies and galvanostatic charge-discharge studies suggested that a coating level of 1.0 wt.% was optimal for materials with good cycling characteristics. While the sol-gel coating process enhanced cyclability 5-fold, the mechano-thermal process yielded materials that exhibited a 12-fold improvement. The enhanced cyclability is attributed to a suppression of the cycle-limiting hexagonal/monoclinic/hexagonal phase transitions accompanying the charge-discharge processes. Materials with better electrochemical characteristics could be obtained by the mechanothermally coating process than sol-gel. Furthermore, the mechano-thermal coating process is a simple, inexpensive, environmentally benign and commercially viable one for the production of high-cycling LiCoO2 cathode materials. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:22 / 31
页数:10
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