Electronic Materials Letters , vol. 4, no. 3, pp.103-105, September, 2008

DOI :

The Enhancement of Cycle-Life Performance in LiCoO₂ Thin Film by Partial Al₂O₃ Coating

Yuhong Oh, Donggi Ahn, Seunghoon Nam, Chunjoong Kim, Joon-Gon Lee, and Byungwoo Park^*
Seoul National University

Abstract : The electrochemical properties of Al₂O₃-coated LiCoO₂ thin films with a partial coating coverage were investigated. The Al₂O₃-coated LiCoO₂ films showed better cycle-life performances with 100% coating coverage. In addition, the Al₂O₃-coating layer with a partial coverage of 50% clearly enhanced the electrochemical properties of LiCoO₂ cathodes even at 60℃. The Al₂O₃-coating layer suppresses Co dissolution from LiCoO₂, consequently enhancing the cycle-life performance.

Keyword : Li-ion battery, Al₂O₃, LiCoO₂, nanoscale, coating