Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 14, Issue 7, Pages 1235-1240Publisher
SPRINGER
DOI: 10.1007/s10008-009-0946-7
Keywords
Li-ion battery; LiCoO2; Al2O3; Nanoscale coating; H2O scavenge
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Funding
- National Research Foundation of Korea, through the Research Center for Energy Conversion and Storage (RCECS) [R11-2002-102-00000-0]
- World Class University (WCU) [R31-2008-000-10075-0]
- National Research Foundation of Korea [R31-2008-000-10075-0, 2002-0037333] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 A degrees 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 a (TM) 3H(2)O layer during cycling, which inhibited the generation of HF by scavenging H2O molecules present in the electrolyte.
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