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The low specific capacity and sluggish electrochemical reaction kinetics greatly block the development of sodium-ion batteries (SIBs). New high-performance electrode materials will enhance development and are urgently required for SIBs. Herein, we report the preparation of supersaturated bridge-sulfur and vanadium co-doped MoS2 nanosheet arrays on carbon cloth (denoted as V-MoS2+x /CC). The bridge-sulfur in MoS2 has been created as a new active site for greater Na+ storage. The vanadium doping increases the density of carriers and facilitates accelerated electron transfer. The synergistic dual-doping effects endow the V-MoS2+x /CC anodes with high sodium storage performance. The optimized V-MoS2.49/CC gives superhigh capacities of 370 and 214 mAh·g-1 at 0.1 and 10 A·g-1 within 0.4-3.0 V, respectively. After cycling 3,000 times at 2 A·g-1, almost 83% of the reversible capacity is maintained. The findings indicate that the electrochemical performances of metal sulfides can be further improved by edge-engineering and lattice-doping co-modification concept.

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Publication history

Received: 23 June 2020
Revised: 04 August 2020
Accepted: 07 August 2020
Published: 05 January 2021
Issue date: January 2021

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© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature

Acknowledgements

The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (Nos. 51672082, 21975074, and 91534202), the Basic Research Program of Shanghai (No. 17JC1402300), the Shanghai Scientific and Technological Innovation Project (No. 18JC1410500), and the Fundamental Research Funds for the Central Universities (No. 222201718002).

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Reprints and Permission requests may be sought directly from editorial office.
Email: nanores@tup.tsinghua.edu.cn

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