期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 160, 期 11, 页码 A2093-A2099出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.064311jes
关键词
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资金
- National High Technology Research and Development Program (863 Program) of China [2012AA110203]
- Special Foundation of Harbin Talents Scientific and Technological Innovation of China [2009RFQXG047]
The reasons for the capacity loss of mesocarbon microbead (MCMB) in lithium ion cells during long-term charge-discharge cycles were evaluated in this paper. The MCMB electrodes were charged and discharged for 2000, 2500 and 3000 cycles after activation. Solid electrolyte interphase (SEI) film was deposited on the surface of MCMB particles after activation. The contents of O and F in SET film tended to increase continuously. Li2O was generated firstly, then LiF was produced later and the content of LiF increased with the cycles proceeding. During the cycles, the voltage differences between charge and discharge platforms increased gradually and the specific capacity decreased. The cell resistances increased continuously and the peak currents of intercalation/de-intercalation reactions in cyclic voltammetry curves were reduced. The decline of electrochemical properties was related to both the growth of SET films and the consumption of electrolyte salt LiPF6. (C) 2013 The Electrochemical Society. All rights reserved.
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