Paving the Way for Using Li2S Batteries

Authors

  • Dr. Rui Xu,

    1. Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439 (USA)
    2. Materials Science Program, Department of Mechanical Engineering, University of Rochester, Rochester, NY 14627 (USA)
    Search for more papers by this author
  • Dr. Xiaofeng Zhang,

    1. Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439 (USA)
    Search for more papers by this author
  • Cun Yu,

    1. Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439 (USA)
    Search for more papers by this author
  • Dr. Yang Ren,

    1. Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439 (USA)
    Search for more papers by this author
  • Prof. James C. M. Li,

    1. Materials Science Program, Department of Mechanical Engineering, University of Rochester, Rochester, NY 14627 (USA)
    Search for more papers by this author
  • Dr. Ilias Belharouak

    Corresponding author
    1. Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439 (USA)
    2. Qatar Environment and Energy Research Institute, Qatar Foundation, P.O. Box 5825, Doha (Qatar)
    • Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439 (USA)

    Search for more papers by this author

Abstract

In this work, a novel lithium–sulfur battery was developed comprising Li2S as the cathode, lithium metal as the anode and polysulfide-based solution as the electrolyte. The electrochemical performances of these Li2S-based cells strongly depended upon the nature of the electrolytes. In the presence of the conventional electrolyte that consisted of lithium bis(trifluoromethanesulfonyl)-imide (LiTFSI) salt dissolved in a solvent combination of dimethoxyethane (DME)/1,3-dioxolane (DOL), the Li/Li2S cells showed sluggish kinetics, which translated into poor cycling and capacity retention. However, when using small amounts of polysulfides in the electrolyte along with a shuttle inhibitor the Li2S cathode was efficiently activated in the cell with the generation of over 1000 mAh g−1 capacity and good cycle life.

Ancillary