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Free-standing N-doped hollow carbon fibers as high-performance anode for potassium ion batteries

氮掺杂空心碳纤维用作高性能钾离子电池自支撑 负极材料

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Abstract

A novel hierarchical architecture—N-doped hollow carbon fibers decorated with N-doped carbon clusters (NHCF@NCC)—was synthesized for high-performance anode material of potassium ion batteries (PIBs). The material is formulated with porous N-doped hollow carbon fibers as the backbone, which effectively shortens the diffusion length of potassium ion and increases the interface between the electrode and electrolyte. In addition, the N-doped carbon clusters attached on the hollow carbon fibers can provide abundant reactive sites. Specially, NHCF@NCC could form a freestanding electrode with a three dimensional interconnected conductive network owing to the ultrahigh aspect ratio. In this way, NHCF@NCC delivers an excellent electrochemical performance as free-standing anode materials of PIBs, exhibiting a high reversible capacity of 310 mA h g−1 at a current density of 100 mA g−1, a long cycling stability of 1000 cycles with negligible degradation, and a superior rate performance of 153 mA h g−1 at a large current density of 2000 mA g−1.

摘要

本文报道了一种具有多级结构(氮掺杂团簇复合中空碳纤 维)、高可逆容量的钾离子电池负极材料(NHCF@NCC). 该电极材 料以多孔氮掺杂中空碳纤维为骨架, 具有大比表面积, 可有效地缩 短钾离子的扩散距离, 增加电极材料与电解质的接触界面. 另外, 附 着在中空碳纤维上的不规则的氮掺杂团簇可以提供更多的反应活 性位点. 由于碳纤维高的纵横比, NHCF@NCC可形成三维连通导 电网络的自支撑结构. 以NHCF@NCC为自支撑无衬底负极的钾离 子电池表现出优异的电化学性能, 100 mA g−1电流密度下可逆容量 可达310 mA h g−1, 1000次循环后容量无明显衰减. 当电流密度增 加到2000 mA g−1, 该自支撑电极仍具有153 mA h g−1 的可逆容量, 显示了优异的倍率性能.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (51672078), Hunan Natural Science Foundation (2019JJ40031), Hunan Provincial Innovation Foundation for Postgraduate (CX20190321) and China Scholarship Council (201906130035).

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Contributions

Chen S and Lu B designed the experiments; Chen S, Yu X and Zhang E performed the characterizations; Chen S wrote the paper with support from Wang J and Feng Y. All authors contributed to the general discussion.

Corresponding author

Correspondence to Bingan Lu  (鲁兵安).

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The authors declare no conflict of interest.

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Supporting data are available in the online version of the paper

Suhua Chen is currently a PhD candidate at the School of Physics and Electronics, Hunan University. She received her MSc in physics from Xinxiang University in 2015. Her research involves the synthesis of materials and device fabrication for energy storage with a focus on carbon materials.

Bingan Lu received his BSc degree (2008) and PhD degree (2012) in condensed matter physics from Lanzhou University. He is currently a Professor at Hunan University. His current research involves nanomaterials for environmental and green energy applications.

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Chen, S., Feng, Y., Wang, J. et al. Free-standing N-doped hollow carbon fibers as high-performance anode for potassium ion batteries. Sci. China Mater. 64, 547–556 (2021). https://doi.org/10.1007/s40843-020-1465-8

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  • DOI: https://doi.org/10.1007/s40843-020-1465-8

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