期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 9, 页码 3638-3644出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201913174
关键词
batteries; non-flammable materials; phosphates; potassium; solvents
资金
- Australian Research Council (ARC) [LP160101629, LE120100104, DP170102406, LE180100141]
- China Scholarship Council (CSC) [201508420150, 201706340049]
- Australian Research Council [LE180100141] Funding Source: Australian Research Council
Potassium-ion batteries are promising for low-cost and large-scale energy storage applications, but the major obstacle to their application is the lack of safe and effective electrolytes. A phosphate-based fire retardant such as triethyl phosphate is now shown to work as a single solvent with potassium bis(fluorosulfonyl)imide at 0.9 m, in contrast to previous Li and Na systems where phosphates cannot work at low concentrations. This electrolyte is optimized at 2 m, where it exhibits the advantages of low cost, low viscosity, and high conductivity, as well as the formation of a uniform and robust salt-derived solid-electrolyte interphase layer, leading to non-dendritic K-metal plating/stripping with Coulombic efficiency of 99.6 % and a highly reversible graphite anode.
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