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A high-performance potassium metal battery using safe ionic liquid electrolyte.


ABSTRACT: Potassium secondary batteries are contenders of next-generation energy storage devices owing to the much higher abundance of potassium than lithium. However, safety issues and poor cycle life of K metal battery have been key bottlenecks. Here we report an ionic liquid electrolyte comprising 1-ethyl-3-methylimidazolium chloride/AlCl3/KCl/potassium bis(fluorosulfonyl) imide for safe and high-performance batteries. The electrolyte is nonflammable and exhibits a high ionic conductivity of 13.1 mS cm-1 at room temperature. A 3.6-V battery with K anode and Prussian blue/reduced graphene oxide cathode delivers a high energy and power density of 381 and 1,350 W kg-1, respectively. The battery shows an excellent cycling stability over 820 cycles, retaining ∼89% of the original capacity with high Coulombic efficiencies of ∼99.9%. High cyclability is also achieved at elevated temperatures up to 60 °C. Uniquely, robust K, Al, F, and Cl-containing passivating interphases are afforded with this electrolyte, which is key to superior battery cycling performances.

SUBMITTER: Sun H 

PROVIDER: S-EPMC7668001 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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A high-performance potassium metal battery using safe ionic liquid electrolyte.

Sun Hao H   Liang Peng P   Zhu Guanzhou G   Hung Wei Hsuan WH   Li Yuan-Yao YY   Tai Hung-Chun HC   Huang Cheng-Liang CL   Li Jiachen J   Meng Yongtao Y   Angell Michael M   Wang Chang-An CA   Dai Hongjie H  

Proceedings of the National Academy of Sciences of the United States of America 20201026 45


Potassium secondary batteries are contenders of next-generation energy storage devices owing to the much higher abundance of potassium than lithium. However, safety issues and poor cycle life of K metal battery have been key bottlenecks. Here we report an ionic liquid electrolyte comprising 1-ethyl-3-methylimidazolium chloride/AlCl<sub>3</sub>/KCl/potassium bis(fluorosulfonyl) imide for safe and high-performance batteries. The electrolyte is nonflammable and exhibits a high ionic conductivity of  ...[more]

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