Significant improvement of high voltage cycling behavior AlF3-coated LiCoO2 cathode
- Authors
- Sun, Y. -K.; Han, J. -M.; Myung, S. -T.; Lee, S. -W.; Amine, K.
- Issue Date
- May-2006
- Publisher
- ELSEVIER SCIENCE INC
- Keywords
- AlF3 coating; cathode materials; impedance; lithium secondary batteries
- Citation
- ELECTROCHEMISTRY COMMUNICATIONS, v.8, no.5, pp.821 - 826
- Indexed
- SCIE
SCOPUS
- Journal Title
- ELECTROCHEMISTRY COMMUNICATIONS
- Volume
- 8
- Number
- 5
- Start Page
- 821
- End Page
- 826
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/181508
- DOI
- 10.1016/j.elecom.2006.03.040
- ISSN
- 1388-2481
- Abstract
- 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.
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