The effect of Al2O3-coating coverage on the electrochemical properties in LiCoO2 thin films
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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.
KeywordsLi-ion battery LiCoO2 Al2O3 Nanoscale coating H2O scavenge
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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