期刊
JOURNAL OF POWER SOURCES
卷 247, 期 -, 页码 57-69出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.08.042
关键词
LiCoO2 cathode; Atomic layer deposition; Metal oxide coatings; Lithium ion batteries; Cobalt dissolution
资金
- Natural Science and Engineering Research Council of Canada (NSERC)
- General Motors of Canada
- Canada Research Chair (CRC) Program
- Canadian Foundation for Innovation (CFI)
- Ontario Research Fund (ORF)
- Early Researcher Award (ERA)
- University of Western Ontario
LiCoO2 in the commercial lithium ion batteries has been suffering from its poor cycling performance at high cutoff voltages. In this study, we employ an atomic layer deposition (ALD) technique to surface-modify a LiCoO2 material with various thickness-controlled metal oxide (TiO2, ZrO2 and Al2O3) coatings to improve its battery performance. The effects of the metal oxide coatings on the electrochemical performance of LiCoO2 electrode are studied in detail. It is demonstrated that a uniform and dense coating via the ALD route on LiCoO2 powder can lower the battery performance due to an obvious decrease in lithium diffusion and electron transport with the coating layers. In contrast, it is revealed that a direct coating on prefabricated LiCoO2 electrodes performs much better than a coating on LiCoO2 powders. It is further disclosed that the improved electrochemical performance of coated LiCoO2 electrode is highly dependent on the coating materials. Of the three coating materials, the Al2O3 coating results in the best cycling stability while the ZrO2 coating contributes to the best rate capability. It is thus suggested that the coating materials are functionally specific, and for the best improvement of a cathode, a particular coating material should be sought. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.
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