Authors
Zelang Jian, Wei Luo, Xiulei Ji
Publication date
2015/9/16
Journal
Journal of the American chemical society
Volume
137
Issue
36
Pages
11566-11569
Publisher
American Chemical Society
Description
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 depotassiation 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.
Scholar articles
Z Jian, W Luo, X Ji - Journal of the American chemical society, 2015