Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (11): 20230223.doi: 10.7503/cjcu20230223

• Physical Chemistry • Previous Articles     Next Articles

Effect of Mo2C/PE Separator on the Performance of Lithium Sulfur Batteries

WANG Qian1,2, WEI Yi2, JIA Hongsheng2()   

  1. 1.Tonghua Normal University,Tonghua 134002,China
    2.Key Laboratory of Functional Materials Physics and Chemistry,Ministry of Education,Jilin Normal University,Siping 136000,China
  • Received:2023-05-05 Online:2023-11-10 Published:2023-08-10
  • Contact: JIA Hongsheng E-mail:iop84041@163.com
  • Supported by:
    the Natural Science Foundation of Jilin Province, China(20200201236JC);the Industrial Technology Research and Development Foundation of Jilin Provincial Development and Reform Commission, China(2022C040-6)

Abstract:

In order to enhance the protective effect of lithium metal negative electrodes and suppress the shuttle effect of polysulfides, the molybdenum based materials with low-cost and high Earth abundance were selected to synthesize molybdenum carbide(Mo2C) with spherical shell structure, and the molybdenum carbide modified polyethylene separators(Mo2C/PE) was prepared. The influence of Mo2C/PE separators on the performance of lithium sulfur batteries was analyzed. The results indicate that the good lithium affinity of Mo2C can induce uniform deposition of Li+ and inhibit the growth of lithium dendrites. The Mo2C/PE separator has a large specific surface area and porosity, which has a certain improvement effect on the volume changes caused by the charging and discharging process. Compared to the battery without PE separator, Li-Li symmetric battery using Mo2C/PE separator has smaller polarization voltage fluctuations and can stably cycle at higher current density. Lithium sulfur batteries equipped with Mo2C/PE separators have a specific discharge capacity of 1235.3 mA·h/g at a rate of 0.2C, and after 500 cycles, the discharge capacity can be maintained at 652.4 mA·h/g.

Key words: Mo2C, Mo2C/PE separator, Lithium sulfur battery, Lithium negative electrode, Electrochemical performance

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