期刊
ACS ENERGY LETTERS
卷 6, 期 2, 页码 387-394出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c02214
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资金
- Vehicle Technologies Program, Office of Energy Efficiency and Renewable Energy, of the U.S. Department of Energy (DOE)
- DOE Office of Biological and Environmental Research
A localized high-concentration electrolyte was designed for silicon anodes to enhance cycling stability over a wide temperature range, showing potential for improved battery performance. Full cells using this electrolyte retained 80% capacity after 500 cycles, demonstrating enhanced thermal stability. The electrolyte design principles developed in this study can be applied to extend the cycle life of other high-capacity electrode materials.
A silicon (Si) anode is a high-capacity alternative for carbonaceous anodes in lithium ion batteries. However, a large volume change during cycling and continuous side reactions with the electrolyte significantly limit its applications. We designed a localized highconcentration electrolyte using 1H,1H,5H-octafluoropentyl 1,1,2,2-tetra-fluoroethyl ether (OTE) as a diluent with the desired molecular structure tailored for a Si anode operating over a wide temperature range. This electrolyte exhibits an optimized ion solvation structure and enabled better cycling stability of Si anodes over a wide temperature range. Full cells with Si/graphite composite anodes and LiNi0.5Mn0.3Co0.2O2 cathodes retained 80% of their capacity after 500 cycles in 1.74 M lithium bis(fluorosulfonyl)imide in dimethyl carbonate with OTE (0.51:0.84:0.84) with enhanced thermal stability. A Si anode cycled in the new electrolyte exhibits a much thinner solid electrolyte interphase and a well-preserved dense structure. The electrolyte design principle developed in this work can be used to extend the cycle life of other high-capacity electrode materials with large volume changes.
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