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An Intrinsically Non-flammable Electrolyte for High-Performance Potassium Batteries

Journal Article


Abstract


  • 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.

Publication Date


  • 2020

Citation


  • Liu, S., Mao, J., Zhang, Q., Wang, Z., Pang, W. K., Zhang, L., . . . Guo, Z. (2020). An Intrinsically Non-flammable Electrolyte for High-Performance Potassium Batteries. Angewandte Chemie - International Edition, 59(9), 3638-3644. doi:10.1002/anie.201913174

Scopus Eid


  • 2-s2.0-85078660098

Start Page


  • 3638

End Page


  • 3644

Volume


  • 59

Issue


  • 9

Abstract


  • 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.

Publication Date


  • 2020

Citation


  • Liu, S., Mao, J., Zhang, Q., Wang, Z., Pang, W. K., Zhang, L., . . . Guo, Z. (2020). An Intrinsically Non-flammable Electrolyte for High-Performance Potassium Batteries. Angewandte Chemie - International Edition, 59(9), 3638-3644. doi:10.1002/anie.201913174

Scopus Eid


  • 2-s2.0-85078660098

Start Page


  • 3638

End Page


  • 3644

Volume


  • 59

Issue


  • 9