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Understanding the Impact of a Nonafluorinated Ether-Based Electrolyte on Li-S Battery

Journal Article · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.0751915jes· OSTI ID:1578052
 [1];  [2];  [3];  [4];  [2];  [2];  [2];  [2];  [5];  [2];  [2];  [2]
  1. Argonne National Lab. (ANL), Argonne, IL (United States); Worcester Polytechnic Institute, MA (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Mercedes-Benz Research & Development North America, Inc., Redford, MI (United States)
  4. Daimler AG, Boeblingen (Germany)
  5. Worcester Polytechnic Institute, MA (United States)

The impact of the electrolyte solvation structure on the performance of Li-S battery was investigated using an electrolyte system containing various solvent ratios of DOL and a nonafluorinated ether: 1,1,2,2-tetrafluoroethyl-2,2,3,3,3-pentafluoropropyl ether (TPE). The cell testing results indicate that increasing the TPE ratio led to both a higher discharge capacity and a higher Coulombic efficiency. The Li electrodes from the Li/Li symmetric cells showed that the one in higher TPE-content electrolyte has a smoother and more continuous SEI layer. AIMD simulation revealed the solvation structure of DOL/TPE - lithium polysulfide changes when the TPE concentration increases, which dictates the lithium polysulfide solubility in such electrolyte. These results shed light on the underpinned mechanism of the improved Coulombic efficiency and cycling performance of the Li-S cell.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1578052
Journal Information:
Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 15 Vol. 166; ISSN 0013-4651
Publisher:
The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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