Journal
SCIENCE BULLETIN
Volume 65, Issue 12, Pages 1003-1012Publisher
ELSEVIER
DOI: 10.1016/j.scib.2020.03.019
Keywords
Electrospinning; Sb@CN nanofibers; Anode material; Potassium-ion batteries
Categories
Funding
- National Natural Science Foundation of China [51904342, 51622406, 21673298]
- National Postdoctoral Program for Innovative Talents [BX201600192]
- Central South University Postdoctoral Foundation [140050018]
- China Postdoctoral Science Foundation [2017 M6203552]
- National Key Research and Development Program of China [2017YFB0102000, 2018YFB0104200]
- Hunan Provincial Science and Technology Plan [2017TP1001]
- Fundamental Research Funds for the Central Universities of Central South University [2019zzts431, 2019zzts433]
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Antimony-based materials with high theoretical capacity are known as promising anodes for potassium-ion batteries (PIBs). However, they still face challenges from the large ionic radius of the K ion, which has sluggish kinetics. Much effort is needed to exploit high-performance electrode materials to satisfy the reversible capacity of PIBs. In this paper, nano Sb confined in N-doped carbon fibers (Sb@CN nanofibers) were successfully prepared through an electrospinning method, which was designed to improve potassium storage performances. Sb@CN nanofibers benefit from the fact that the synergy between the porous nanofiber frame structure and the uniformly distributed Sb nano-components in the carbon matrix can effectively accelerate the ion migration rate and reduce the mechanical stress caused by K+ insertion/extraction, Sb@CN nanofiber electrodes thus exhibited excellent potassium storage performance, especially long cycle stability, as expected. When utilized as a PIB anode, they delivered high reversible capacity of 360.2 mAh g(-1) after 200 cycles at 50 mA g(-1), and a particularly stable capacity of 212.7 mAh g(-1) was also obtained after 1000 cycles even at 5000 mA g(-1). Given such outstanding electrochemical performances, this work is expected to provide insight into the development and exploration of advanced alloy-type electrodes for PIBs. (C) 2020 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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