Chemical Research in Chinese Universities ›› 2020, Vol. 36 ›› Issue (3): 431-438.doi: 10.1007/s40242-020-0120-4

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Bimetallic Sulfide/Sulfur Doped T3C2Tx MXene Nanocomposites as High-performance Anode Materials for Sodium-ion Batteries

ZANG Rui1, LI Peng1, WANG Guoxiu2   

  1. 1. College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210006, P. R. China;
    2. Centre of Clean Energy Technology, Faculty of Science, University of Technology, Sydney, NSW 2007, Australia
  • Received:2020-04-17 Revised:2020-05-13 Online:2020-06-01 Published:2020-05-30
  • Contact: WANG Guoxiu E-mail:Guoxiu.Wang@uts.edu.au
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21573110) and the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD), China.

Abstract: The application of transition metal dichalcogenides(TMDs) as anode materials in sodium-ion batteries (SIBs) has been hindered by low conductivity and poor cyclability. Herein, we report the synthesis of CoxFe1-xS2 bimetallic sulfide/sulfur-doped Ti3C2 MXene nanocomposites(CoxFe1-xS2@S-Ti3C2) by a facile co-precipitation process and thermal-sulfurization reaction. The interconnected 3D frameworks consisting of MXene nanosheets can effectively buffer the volume change and enhance the charge transfer. In particular, sulfur-doped MXene nanosheets provide rich active sites for sodium storage and restrain sulfur loss during charging/discharging processes, leading the increase of specific capacity and cycling the stability of anode materials. As a result, CoxFe1-xS2@S-Ti3C2 anodes exhibited high capacity, high rate capability and long cycle life(399 mA·h/g at 5 A/g with an 94% capacity retention after 600 cycles).

Key words: Bimetallic sulfide, Ti3C2 MXene, Sulfur doping, Anode material, Sodium-ion battery