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S/N–Doped High–Capacity Mesoporous Carbon Anode for Na–ion Batteries

Abstract

Low–cost Na–ion batteries (SIBs) are a promising alternative to Li–ion batteries (LIBs) for large–scale energy storage systems due to their abundant sodium resources and eco-friendliness. The volumetric changes of sodium anodes during the sodiation/desodiation processes, however, reduces the cycling life of a Na–ion battery. Graphite as the commercial anode for LIBs is not applied in SIBs because of the unsuitable interlayer distance for Na+ intercalation. Therefore, we have used the electrospinning method to successfully fabricate mesoporous S/N–doped carbon nanofibers (S/N–C), which show a high capacity and high–rate capability in a Na–ion battery. The S/N–C nanofibers delivered a high capacity of 552.5 and 327.5 mAh g–1 at 0.1 and 5 A g–1, respectively, with a high initial coulombic efficienvy because of the high S-doping (27.95%) in the carbon nanofiber. The introduction of N and S in S/N–C nanofibers increases the active sites for Na+ storage and reduces the energy required for Na+ transfer, as confirmed by in–situ Raman spectra and density functional theory (DFT) calculations. Moreover, the mesoporous S/N nanofibers are wetted by the liquid electrolyte, which facilitates the Na+ transport and increases the rate performance, thus making them suitable anode materials for SIBs and other electrochemical energy storage devices.

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Publication details

The article was received on 12 Feb 2019, accepted on 09 Apr 2019 and first published on 10 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA01615E
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    S/N–Doped High–Capacity Mesoporous Carbon Anode for Na–ion Batteries

    X. Li, X. Hu, L. Zhou, R. Wen, X. Xu, S. Chou, L. Chen, A. Cao and S. X. Dou, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA01615E

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