能源化学(英文版) ›› 2019, Vol. 39 ›› Issue (12): 249-255.

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Te0.045S0.955PAN composite with high average discharge voltage for Li-S battery

Ke Wanga, Yuepeng Guanb, Zhaoqing Jinc, Weikun Wangc, Anbang Wangc   

  1. a School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China;
    b Department of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
    c Military Power Sources Research and Development Center, Research Institute of Chemical Defense, Beijing 100191, China
  • 收稿日期:2019-01-10 修回日期:2019-03-06 出版日期:2019-12-15 发布日期:2020-12-18
  • 通讯作者: Zhaoqing Jin, anuoking23@163.com; Weikun Wang, wangweikun2002@163.com; Anbang Wang, wab_wang2000@126.com
  • 基金资助:
    This work was financially supported by the National Key Research and Development program of China (no. 2016YFB0100200) and Beijing Municipal Science and Technology Project (no. Z181100004518001).

Te0.045S0.955PAN composite with high average discharge voltage for Li-S battery

Ke Wanga, Yuepeng Guanb, Zhaoqing Jinc, Weikun Wangc, Anbang Wangc   

  1. a School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China;
    b Department of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
    c Military Power Sources Research and Development Center, Research Institute of Chemical Defense, Beijing 100191, China
  • Received:2019-01-10 Revised:2019-03-06 Online:2019-12-15 Published:2020-12-18
  • Contact: Zhaoqing Jin, anuoking23@163.com; Weikun Wang, wangweikun2002@163.com; Anbang Wang, wab_wang2000@126.com
  • Supported by:
    This work was financially supported by the National Key Research and Development program of China (no. 2016YFB0100200) and Beijing Municipal Science and Technology Project (no. Z181100004518001).

摘要: As a sulfur-containing cathode material, sulfide polyacrylonitrile (SPAN) is expected to be used for longlife lithium-sulfur battery because there is no shuttle effect occurred in its charge process. However, its specific capacity and discharge potential need to be further improved to satisfy the urgent demands for high-performance batteries. In this paper, Te0.045S0.955PAN composite was synthesized by co-heating TexS1-x and PAN, and the superior electrochemical performance to that of SPAN was obtained because of doping Te with high conductivity. The as-prepared Te0.045S0.955PAN composite possessed the specific capacity of 675 mAh g-1 after 100 cycles at the current density of 0.1 A g-1 with high capacity retention of 96.6% compared to the second cycle. Especially, during cycling, Te0.045S0.955PAN showed average discharge voltages of 1.88-1.91 V, which were higher than 1.85-1.88 V for SPAN at the same current density. Thus doping Te provides a new strategy for increasing the energy density of SPAN.

关键词: Sulfurized polyacrylonitrile, Tellurium, Cathode, Average discharge voltage, Lithium-sulfur battery

Abstract: As a sulfur-containing cathode material, sulfide polyacrylonitrile (SPAN) is expected to be used for longlife lithium-sulfur battery because there is no shuttle effect occurred in its charge process. However, its specific capacity and discharge potential need to be further improved to satisfy the urgent demands for high-performance batteries. In this paper, Te0.045S0.955PAN composite was synthesized by co-heating TexS1-x and PAN, and the superior electrochemical performance to that of SPAN was obtained because of doping Te with high conductivity. The as-prepared Te0.045S0.955PAN composite possessed the specific capacity of 675 mAh g-1 after 100 cycles at the current density of 0.1 A g-1 with high capacity retention of 96.6% compared to the second cycle. Especially, during cycling, Te0.045S0.955PAN showed average discharge voltages of 1.88-1.91 V, which were higher than 1.85-1.88 V for SPAN at the same current density. Thus doping Te provides a new strategy for increasing the energy density of SPAN.

Key words: Sulfurized polyacrylonitrile, Tellurium, Cathode, Average discharge voltage, Lithium-sulfur battery