Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 19, Pages 5449-5453Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201802248
Keywords
cathode materials; polyaniline; polymer electrolytes; potassium batteries; potassium metal anodes
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0005397]
- Office of Vehicle Technologies of the U.S. Department of Energy through the Advanced Battery Research (BMR) Program (Battery 500 Consortium) [DE-EE000762]
- Robert A. Welch Foundation [F-1066]
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A safe, rechargeable potassium battery of high energy density and excellent cycling stability has been developed. The anion component of the electrolyte salt is inserted into a polyaniline cathode upon charging and extracted from it during discharging while the K+ ion of the KPF6 salt is plated/stripped on the potassium-metal anode. The use of a p-type polymer cathode increases the cell voltage. By replacing the organic-liquid electrolyte in a glass-fiber separator with a polymer-gel electrolyte of cross-linked poly(methyl methacrylate), a dendrite-free potassium anode can be plated/stripped, and the electrode/electrolyte interface is stabilized. The potassium anode wets the polymer, and the cross-linked architecture provides small pores of adjustable sizes to stabilize a solid-electrolyte interphase formed at the anode/electrolyte interface. This alternative electrolyte/cathode strategy offers a promising new approach to low-cost potassium batteries for the stationary storage of electric power.
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