Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Li2S-Incorporated Separator for Achieving High-Energy-Density Li-S Batteries

  • Park, Jong Won (School of Energy, Materials & Chemical Engineering, Korea University of Technology and Education) ;
  • Kang, Jukyoung (School of Energy, Materials & Chemical Engineering, Korea University of Technology and Education) ;
  • Koh, Jeong Yoon (School of Energy, Materials & Chemical Engineering, Korea University of Technology and Education) ;
  • Caron, Arnaud (School of Energy, Materials & Chemical Engineering, Korea University of Technology and Education) ;
  • Kim, Seok (School of Chemical and Biomolecular Engineering, Pusan National University) ;
  • Jung, Yongju (School of Energy, Materials & Chemical Engineering, Korea University of Technology and Education)
  • Received : 2019.07.10
  • Accepted : 2019.07.29
  • Published : 2020.02.28
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Abstract

We present a new and facile design of a high-performance Li-S cell by integrating a Li2S-impregnated glass fiber separator together with a common sulfur cathode. We find that a considerable amount of Li2S is consumed amidst the first charge, and most of Li2S disappears at the end of the second charge. During the charge process, additional sulfur material is formed and contributes to a significant enhancement of the discharge capacity (~1400 mAh/g), compared with a control cell (~1260 mAh/g) without Li2S. Moreover, the Li2S containing cell exhibits much higher cycling stability (a 31% increase from ~840 to ~1100 mAh/g in the 100th cycle) and rate capability (a 30% increase from ~580 to ~750 mAh/g at 2 C) than the control cell. Our results indicate that adopting Li2S-containing separator is highly effective to improving the electrochemical performances of Li-S cells.

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References

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