Polysulfide Speciation in the Bulk Electrolyte of a Lithium Sulfur Battery

  • McBrayer J
  • Beechem T
  • Perdue B
  • et al.
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Abstract

© The Author(s) 2018. In situ Raman microscopy was used to study polysulfide speciation in the bulk ether electrolyte during the discharge and charge of a Li-S electrochemical cell to assess the complex interplay between chemical and electrochemical reactions in solution. During discharge, long chain polysulfides and the S3−radical appear in the electrolyte at 2.4 V indicating a rapid equilibrium of the dissociation reaction to form S3−. When charging, however, an increase in the concentration of all polysulfide species was observed. This highlights the importance of the electrolyte to sulfur ratio and suggests a loss in the useful sulfur inventory from the cathode to the electrolyte.

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McBrayer, J. D., Beechem, T. E., Perdue, B. R., Apblett, C. A., & Garzon, F. H. (2018). Polysulfide Speciation in the Bulk Electrolyte of a Lithium Sulfur Battery. Journal of The Electrochemical Society, 165(5), A876–A881. https://doi.org/10.1149/2.0441805jes

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