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Title: 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 S 3 - radical appear in the electrolyte at 2.4 V indicating a rapid equilibrium of the dissociation reaction to form S 3 -. 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.
Authors:
ORCiD logo [1] ;  [2] ;  [2] ;  [2] ;  [1]
  1. Univ. of New Mexico, Albuquerque, NM (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Report Number(s):
SAND2018-2836J
Journal ID: ISSN 0013-4651; 661507
Grant/Contract Number:
NA0003525
Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 165; Journal Issue: 5; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; lithium sulfur battery; polysulfide speciation; Raman
OSTI Identifier:
1432474