Polysulfide Speciation in the Bulk Electrolyte of a Lithium Sulfur Battery

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...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2018-01, Vol.165 (5), p.A876-A881
Main Authors: McBrayer, Josefine D., Beechem, Thomas E., Perdue, Brian R., Apblett, Christopher A., Garzon, Fernando H.
Format: Article
Language:English
Subjects:
ENERGY STORAGE
lithium sulfur battery
polysulfide speciation
Raman
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Summary: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.
ISSN:0013-4651
1945-7111
DOI:10.1149/2.0441805jes