期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 137, 期 36, 页码 11566-11569出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b06809
关键词
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资金
- Oregon State University
- Advanced Research Projects Agency-Energy (ARPA-E), Department of Energy of the United States [DE-AR0000297TDD]
We for the first time report electrochemical potassium insertion in graphite in a nonaqueous electrolyte, which can exhibit a high reversible capacity of 273 mAh/g. Ex situ XRD studies confirm that KC36, KC24, and KC8 sequentially form upon potassiation, whereas depot-assiation recovers graphite through phase transformations in an opposite sequence. Graphite shows moderate rate capability and relatively fast capacity fading. To improve the performance of carbon K-ion anodes, we synthesized a nongraphitic soft carbon that exhibits cyclability and rate capability much superior to that of graphite. This work may open up a new paradigm toward rechargeable K-ion batteries.
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