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Lotus rhizome-like S/N–C with embedded WS2 for superior sodium storage

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Abstract

Sodium-ion batteries (SIBs) hold great promise as power sources because of their low cost and decent electrochemical behavior. Nevertheless, the poor rate performance and long-term cycling capability of anode materials in SIBs still impede their practical application in smart grids and electric vehicles. Herein, we design a delicate method to embed WS2 nanosheets into lotus rhizome-like heteroatom-doped carbon nanofibers with abundant hierarchical tubes inside, forming WS2@sulfur and nitrogen-doped carbon nanofibers (WS2@S/N–C). The WS2@S/N–C nanofibers exhibit a large discharge capacity of 381 mA h g−1 at 100 mA g−1, excellent rate capacity of 108 mA h g−1 at 30 A g−1, and a superior capacity of 175 mA h g−1 at 5 A g−1 after 1000 cycles. The excellent performance of WS2@S/N–C is ascribed to the synergistic effects of WS2 nanosheets, contributing to larger interlayer spacing, and the stable lotus rhizome-like S/N–C nanofiber frameworks which alleviate the mechanical stress. Moreover, the WS2@S/N–C electrode shows obvious pseudocapacitive properties at 1 mV s−1 with a capacitive contribution of 86.5%. In addition, density functional theory calculations further indicate that the WS2@S/N–C electrode is very favorable for Na storage. This novel synthetic strategy is a promising method for synthesizing other electrode materials for rechargeable batteries in the future.

Graphical abstract: Lotus rhizome-like S/N–C with embedded WS2 for superior sodium storage

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Publication details

The article was received on 26 Aug 2019, accepted on 22 Oct 2019 and first published on 23 Oct 2019


Article type: Paper
DOI: 10.1039/C9TA09373G
J. Mater. Chem. A, 2019, Advance Article

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    Lotus rhizome-like S/N–C with embedded WS2 for superior sodium storage

    X. Li, Y. Sun, X. Xu, Y. Wang, S. Chou, A. Cao, L. Chen and S. Dou, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA09373G

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