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The effect of Al2O3-coating coverage on the electrochemical properties in LiCoO2 thin films

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Abstract

The electrochemical properties of nanoscale Al2O3-coated LiCoO2 thin films were examined as a function of the coating coverage. Al2O3-coated LiCoO2 films showed enhanced cycle-life performance with increasing degree of coating coverage, which was attributed to the suppression of Co dissolution and F− concentration in the electrolyte. Moreover, an Al2O3-coating layer with partial coverage clearly improved the electrochemical properties, even at 60 °C or with a water-contaminated electrolyte. Even though metal-oxide coating on LiCoO2 has been actively investigated, the mechanisms of nanoscale coating have yet to be clearly identified. In this article, surface analysis suggested that the Al2O3-coating layer had transformed to an AlF3 ∙3H2O layer during cycling, which inhibited the generation of HF by scavenging H2O molecules present in the electrolyte.

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Acknowledgement

This work was supported by the National Research Foundation of Korea, through the Research Center for Energy Conversion and Storage (RCECS, R11-2002-102-00000-0) and the World Class University (WCU, R31-2008-000-10075-0).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, and Research Center for Energy Conversion and Storage, Seoul National University, Seoul, 151-744, Korea

    Yuhong Oh, Donggi Ahn, Seunghoon Nam & Byungwoo Park

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  1. Yuhong Oh
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  2. Donggi Ahn
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  3. Seunghoon Nam
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  4. Byungwoo Park
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Corresponding author

Correspondence to Byungwoo Park.

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Yuhong Oh and Donggi Ahn contributed equally to this work.

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Oh, Y., Ahn, D., Nam, S. et al. The effect of Al2O3-coating coverage on the electrochemical properties in LiCoO2 thin films. J Solid State Electrochem 14, 1235–1240 (2010). https://doi.org/10.1007/s10008-009-0946-7

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  • DOI: https://doi.org/10.1007/s10008-009-0946-7

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