J. Mater. Sci. Technol. ›› 2022, Vol. 98: 136-142.DOI: 10.1016/j.jmst.2021.05.022

• Research Article • Previous Articles     Next Articles

Templated spherical coassembly strategy to fabricate MoS2/C hollow spheres with physical/chemical polysulfides trapping for lithium-sulfur batteries

Ting Hea,c, Jiajia Rua,b, Yutong Fenga,b, Dapeng Bic, Jiansheng Zhangc, Feng Gud, Chi Zhanga,b,*(), Jinhu Yanga,b,*()   

  1. aResearch Center for Translational Medicine & Key Laboratory of Arrhythmias of the Ministry of Education of China, East Hospital, Tongji University School of Medicine, No. 150 Jimo Road, Shanghai 200120, P. R. China
    bSchool of Chemical Science and Engineering, Tongji University, Shanghai 200092, P. R. China
    cDepartment of Energy and Power Engineering, Tsinghua University, Beijing 100084, P. R. China
    dInstitute for Process Modelling and Optimization, Jiangsu Industrial Technology Research Institute, No. 388 Ruoshui Road, SIP, Suzhou, Jiangsu, China
  • Received:2021-04-20 Revised:2021-05-07 Accepted:2021-05-15 Published:2022-01-30 Online:2022-01-25
  • Contact: Chi Zhang,Jinhu Yang
  • About author:yangjinhu@tongji.edu.cn (J.Yang).
    * E-mail addresses: chizhang@tongji.edu.cn (C. Zhang),

Abstract:

Rational design of advanced polar hosts with high sulfur loading, facilitated ionic/electronic transport and effectively suppressed shuttling effect has great potential for high performance lithium-sulfur batteries, yet it remains challenging. Here we propose a novel templated spherical coassembly strategy to fabricate the MoS2/C hollow spheres as an efficient sulfur host material. The unique hollow structure provides enough interior space for accommodating a substantial amount of sulfur, and effectively suppresses the diffusion of dissolved polysulfides by both physical confinement and chemical adsorption. Moreover, the ionic transport as well as the ability to mitigate volume variation upon cycling is also improved, thereby maximizing the utilization of sulfur. Owing to these merits, when evaluated as a sulfur host for lithium-sulfur batteries, the MoS2/C hollow spheres exhibit appealing electrochemical performance with an impressive specific capacity of 1082 mA h g-1 at 0.1 C, excellent rate capability and superior cycling stability with a low fading rate of 0.04% per cycle.

Key words: Lithium-sulfur batteries, Cathode, MoS2/C hollow spheres, Physical confinement, Chemical adsorption