期刊
SMALL
卷 14, 期 33, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201802140
关键词
alloy-dealloy mechanism; carbon nanosheets; electrochemical energy storage; potassium ion batteries; red phosphorus
类别
资金
- National Natural Science Foundation of China [51672188]
- Natural Science Foundation of Tianjin City [16JCYBJC40900]
- Thousand Talents Plan for Young Professionals of China
Red phosphorus (P) has been recognized as a promising storage material for Li and Na. However, it has not been reported for K storage and the reaction mechanism remains unknown. Herein, a novel nanocomposite anode material is designed and synthesized by anchoring red P nanoparticles on a 3D carbon nanosheet framework for K-ion batteries (KIBs). The red P@CN composite demonstrates a superior electrochemical performance with a high reversible capacity of 655 mA h g(-1) at 100 mA g(-1) and a good rate capability remaining 323.7 mA h g(-1) at 2000 mA g(-1), which outperform reported anode materials for KIBs. The transmission electron microscopy and theoretical calculation results suggest a one-electron reaction mechanism ofP + K+ + e(-) KP, corresponding to a theoretical capacity of 843 mA h g(-1),which is the highest value for anode materials investigated for KIBs. The study not only sheds light on the rational design of high performance red P anodes for KIBs but also offers a fundamental understanding of the potassium storage mechanism of red P.
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