期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 8, 期 5, 页码 821-826出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2006.03.040
关键词
AlF3 coating; cathode materials; impedance; lithium secondary batteries
To improve the capacity retention of LiCoO2 at 4.5 V cut-off cycling, the AlF3 as new coating material was introduced. The AlF3-coated LiCoO2 showed no large difference in the bulk structure and a uniform AlF3-coating layer whose thickness is of about 10 nm covers LiCoO2 particles, as confirmed by transmission electron microscopy. The AlF3-coated LiCoO2 delivered the similar initial discharge capacity to pristine LiCoO2 to 4.5 V versus Li. Surprisingly, the capacity retention and rate capability were greatly enhanced comparing to the pristine LiCoO2. Ac-impedance results showed that the AlF3-coated LiCoO2 has stable charge transfer resistance (R-ct) on cycling. Reduced Co dissolution was also seen for the AlF3-coated LiCoO2. (c) 2006 Elsevier B.V. All rights reserved.
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