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Citation: WANG Huanhuan, LU Songtao, QIN Wei, WU Xiaohong. Preparation and Electrochemical Performance of MoS2@Co9S8 Yolk-Shell Nanocomposites[J]. Chinese Journal of Applied Chemistry, ;2018, 35(8): 956-962. doi: 10.11944/j.issn.1000-0518.2018.08.180145 shu

Preparation and Electrochemical Performance of MoS2@Co9S8 Yolk-Shell Nanocomposites

  • a.

    MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China

  • b.

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

  • Corresponding author: WU Xiaohong, wuxiaohong@hit.edu.cn
  • Received Date: 2 May 2018
    Revised Date: 20 June 2018
    Accepted Date: 25 June 2018

    Fund Project: the National Natural Science Foundation of China 51572060Supported by the National Natural Science Foundation of China(No.51572060, No.51502062)the National Natural Science Foundation of China 51502062

Figures(6)

  • Transition metal sulfides have emerged as a desirable anode material for lithium-ion batteries in recent years. Among them, molybdenum disulfide(MoS2) has received intensive research attention because of its unique 2D-layered structure, which can provide an effective diffusion path for the intercalation and exfoliation of lithium ions during the electrochemical reaction process and high theoretical specific capacities(670 mA·h/g). However, as an typical semiconductor material, MoS2 suffers from the inherent low electrical conductivity and large volumetric expansion/shrinkage upon cycling, which will result in poor rate capability and rapid capacity decay that limit its large-scale applications. Much efforts have been devoted to passing these problems by optimizing MoS2 materials to nanostructures and integrating MoS2 with other conductive materials. Cobalt sulfide(Co9S8) is a metallic transition metal sulfide with relatively higher electrical conductivity but shows inferior electrochemical performance, which is possibly related to its sluggish ion transport kinetics. In this regard, the combination of MoS2 and Co9S8 into rationally designed hybrid architectures may offer synergistic advantages, which manifest overall structural merits over the individual component. Herein, we report the synthesis of uniform MoS2@Co9S8 yolk-shell spheres via solvothermal together with chemical vapor deposition method. The MoS2 and Co9S8 are homogeneously distributed throughout the entire yolk-shell spheres, which leads to a faster electron and Li-ion transport and effectively improves the cycling stability and reversible capacity. The void space in the yolk-shell structure can efficiently cushion the volume change during the discharge/charge process. The uniform mixing of the Co9S8 and MoS2 nanocrystals can also facilitate rapid ion/electron transportation and help to stabilize the cycling performance. Therefore, the as-prepared MoS2@Co9S8 yolk-shell spheres deliver superior Li storage performance with good rate capability and stable cycling performance. Especially for the lithium ion battery application, the MoS2@Co9S8 yolk-shell spheres show a remarkably reversible capacity of about 631.5 mA·h/g after 500th cycles at a current density of 0.2 A/g.
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