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Electrochemical stability in cerium-phosphate–coated LiCoO2 thin films

Published online by Cambridge University Press:  03 March 2011

Donggi Ahn ,
Chunjoong Kim ,
Joon-Gon Lee ,
Byoungsoo Kim ,
Yejun Park  and
Byoungwoo Park
Donggi Ahn
Affiliation:
Department of Materials Science and Engineering and Research Center for Energy Conversion and Storage, Seoul National University, Seoul 151-744, Korea
Chunjoong Kim
Affiliation:
Department of Materials Science and Engineering and Research Center for Energy Conversion and Storage, Seoul National University, Seoul 151-744, Korea
Joon-Gon Lee
Affiliation:
Department of Materials Science and Engineering and Research Center for Energy Conversion and Storage, Seoul National University, Seoul 151-744, Korea
Byoungsoo Kim
Affiliation:
Department of Materials Science and Engineering and Research Center for Energy Conversion and Storage, Seoul National University, Seoul 151-744, Korea
Yejun Park
Affiliation:
Department of Materials Science and Engineering and Research Center for Energy Conversion and Storage, Seoul National University, Seoul 151-744, Korea
Byoungwoo Park*
Affiliation:
Department of Materials Science and Engineering and Research Center for Energy Conversion and Storage, Seoul National University, Seoul 151-744, Korea
*
a) Address all correspondence to this author. e-mail: byungwoo@snu.ac.kr
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Abstract

The electrochemical stability of LiCoO2 thin films was improved by cerium-phosphate coating deposited at room temperature. The cerium-phosphate coating layer also effectively suppressed the increase of charge-transfer resistance during cycling. However, the cycling stability and the initial capacity of the coated LiCoO2 thin films deteriorated as the annealing temperature increased, different from other metal-phosphate coating. These phenomena were attributed to the interdiffusion between the cerium-phosphate coating layer and LiCoO2 thin film, instead of the nanocrystal formation in the amorphous coating layer.

Keywords

CoatingEnergy storageLi
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 3 , March 2007 , pp. 688 - 694
Copyright
Copyright © Materials Research Society 2007

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