期刊
ACS APPLIED POLYMER MATERIALS
卷 4, 期 4, 页码 2734-2746出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.2c00014
关键词
potassium battery; solid polymer electrolytes; SPEs; polyethylene oxide; PEO; KTFSI; Prussian blue analogue; PBA
资金
- German Federal Ministry of Education and Research (BMBF) within FestBatt [13XP0175C]
- Helmholtz Association
- Russian Foundation for Basic Research [21-53-12039]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy [EXC 2154, 390874152]
- German Research Foundation [448719339]
Potassium-ion batteries are a promising technology that offer ecological and economic benefits. Solid polymer electrolytes provide a solution to capacity fade and safety concerns associated with liquid electrolytes. The solid-state potassium battery demonstrated superior capacity retention compared to a conventional liquid electrolyte.
Potassium-ion batteries are an emerging post-lithium technology that are considered ecologically and economically benign in terms of raw materials' abundance and cost. Conventional cell configurations employ flammable liquid electrolytes that impose safety concerns, as well as considerable degrees of irreversible side reactions at the reactive electrode interfaces (especially against potassium metal), resulting in a rapid capacity fade. While being inherently safer, solid polymer electrolytes may present a solution to capacity losses owing to their broad electrochemical stability window. Herein, we present for the first time a stable solid-state potassium battery composed of a potassium metal negative electrode, a Prussian blue analogue K2Fe[Fe(CN)(6)] positive electrode, and a poly(ethylene oxide)-potassium bis(trifluoromethanesulfonyl)imide polymer electrolyte. At an elevated operating temperature of 55 degrees C, the solid-state battery achieved a superior capacity retention of 90% over 50 cycles in direct comparison to a conventional carbonate-based liquid electrolyte operated at ambient temperature with a capacity retention of only 66% over the same cycle number interval.
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