期刊
JOURNAL OF POWER SOURCES
卷 236, 期 -, 页码 175-180出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2013.02.064
关键词
Carbonate-based electrolyte; High voltage cell; 5 V LiNi0.5Mn1.5O4 cathode; Electrochemical performance; Lithium-ion batteries
资金
- U.S. Department of Energy, Vehicle Technologies Office
One conventional electrolyte (Gen 2) for lithium-ion batteries consists of 1.2 M LiPF6 dissolved in ethylene carbonate and ethyl methyl carbonate. A comprehensive investigation of this electrolyte in a high-voltage graphite/LiNi0.5Mn1.5O4 (LNMO) cell was carried out to evaluate its voltage stability under various charging conditions. Although the carbonate-based electrolyte was relatively stable when the graphite/LNMO cell was charged to 4.8 V at room temperature, the introduction of a constant-voltage charging step aggravated the oxidative decomposition of the electrolyte. Further increase in the cell charging voltage to 4.9 V or above and further increase in the temperature to 55 degrees C caused cell performance to deteriorate dramatically. (C) 2013 Elsevier B.V. All rights reserved.
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