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Title: Reduction mechanism of sulfur in lithium-sulfur battery: From elemental sulfur to polysulfide

In this study, the polysulfide ions formed during the first reduction wave of sulfur in Li–S battery were determined through both in-situ and ex-situ derivatization of polysulfides. By comparing the cyclic voltammetric results with and without the derivatization reagent (methyl triflate) as well as the in-situ and ex-situ derivatization results under potentiostatic condition, in-situ derivatization was found to be more appropriate than its ex-situ counterpart, since subsequent fast chemical reactions between the polysulfides and sulfur may occur during the timeframe of ex-situ procedures. It was found that the major polysulfide ions formed at the first reduction wave of elemental sulfur were the S42– and S52– species, while the widely accepted reduction products of S82– and S62– for the first reduction wave were in low abundance.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [1]
  1. Univ. of Wisconsin, Milwaukee, WI (United States)
  2. Wuhan Univ. of Technology, Wuhan (People's Republic of China)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Xidian Univ., Shanxi (People's Republic of China)
Publication Date:
OSTI Identifier:
1235890
Report Number(s):
BNL--111743-2016-JA
Journal ID: ISSN 0378-7753; R&D Project: MA453MAEA; VT1201000
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
Journal of Power Sources
Additional Journal Information:
Journal Volume: 301; Journal Issue: C; Journal ID: ISSN 0378-7753
Publisher:
Elsevier
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE reduction of sulfur; Lithium–sulfur battery; polysulfide; HPLC