期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 117, 期 45, 页码 27847-27853出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2012716117
关键词
potassium battery; ionic liquid electrolyte; Prussian blue; high-safety battery; high-energy-density battery
资金
- Stanford Bits and Watts Program
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/re-duced 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 similar to 89% of the original capacity with high Coulombic efficiencies of similar to 99.9%. High cyclability is also achieved at elevated temperatures up to 60 degrees C. Uniquely, robust K, Al, F, and Cl-containing passivating interphases are afforded with this electrolyte, which is key to superior battery cycling performances.
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