期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 41, 页码 14578-14583出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201908918
关键词
carbon nanofibers; energy storage; nanochannels; potassium-ion batteries; Sb nanocrystals
资金
- National Natural Science Foundation of China [51577094] Funding Source: Medline
- Natural Science Foundation of Jiangsu Province of China [BK20180086] Funding Source: Medline
Sb-based nanocomposites are attractive anode materials for batteries as they exhibit large theoretical capacity and impressive working voltage. However, tardy potassium ion diffusion characteristics, unstable Sb/electrolyte interphase, and huge volume variation pose a challenge, hindering their practical use for potassium-ion batteries (PIBs). Now, a simple robust strategy is presented for uniformly impregnating ultrasmall Sb nanocrystals within carbon nanofibers containing an array of hollow nanochannels (denoted u-Sb@CNFs), resolving the issues above and yielding high-performance PIBs. u-Sb@CNFs can be directly employed as an anode, thereby dispensing with the need for conductive additives and binders. Such a judiciously crafted u-Sb@CNF-based anode renders a set of intriguing electrochemical properties, representing large charge capacity, unprecedented cycling stability, and outstanding rate performance. A reversible capacity of 225 mAh g(-1) is retained after 2000 cycles at 1 A g(-1).
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