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An Intrinsically Non‐flammable Electrolyte for High‐Performance Potassium Batteries
Author(s) -
Liu Sailin,
Mao Jianfeng,
Zhang Qing,
Wang Zhijie,
Pang Wei Kong,
Zhang Lei,
Du Aijun,
Sencadas Vitor,
Zhang Wenchao,
Guo Zaiping
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201913174
Subject(s) - electrolyte , faraday efficiency , anode , potassium , chemistry , chemical engineering , inorganic chemistry , phosphate , energy storage , materials science , organic chemistry , electrode , engineering , power (physics) , physics , quantum mechanics
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.