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The Effect of Al[sub 2]O[sub 3] Coating on the Cycle Life Performance in Thin-Film LiCoO[sub 2] Cathodes

2002; Institute of Physics; Volume: 149; Issue: 10 Linguagem: Inglês

10.1149/1.1505634

1945-7111

Yong Jeong Kim, Tae‐Joon Kim, Jae Wook Shin, Byungwoo Park, Jaephil Cho,

Semiconductor materials and interfaces

The electrochemical stability of films is improved by an coating on top of the thin-film cathode material. Galvanostatic charge/discharge experiments showed enhanced electrochemical properties in the -coated films than the bare ones. This phenomenon is related to the faster Li diffusion rate in the -coated samples, as evidenced by cyclic voltammograms. This provides easier pathways for Li-ion migration by forming a thin-film solid solution layer Similar results were observed in powders, showing enhanced cycle performance after coating with a thin-film metal-oxide coating. However, unlike the powder geometry, both bare and -coated thin films showed negligible axis expansion. © 2002 The Electrochemical Society. All rights reserved.