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A Selection Rule for Hydrofluoroether Electrolyte Cosolvent: Establishing a Linear Free‐Energy Relationship in Lithium–Sulfur Batteries

Journal Article · · Angewandte Chemie
 [1];  [1];  [2];  [3]
  1. Chemical Sciences and Engineering Division Argonne National Laboratory 9700 S. Cass Avenue Lemont IL 60439 USA
  2. Materials Science Division Argonne National Laboratory 9700 S. Cass Avenue Lemont IL 60439 USA
  3. Chemical Sciences and Engineering Division Argonne National Laboratory 9700 S. Cass Avenue Lemont IL 60439 USA, Materials Science and Engineering Stanford University Stanford CA 94305 USA
Abstract

Hydrofluoroethers (HFEs) have been adopted widely as electrolyte cosolvents for battery systems because of their unique low solvating behavior. The electrolyte is currently utilized in lithium‐ion, lithium–sulfur, lithium–air, and sodium‐ion batteries. By evaluating the relative solvating power of different HFEs with distinct structural features, and considering the shuttle factor displayed by electrolytes that employ HFE cosolvents, we have established the quantitative structure–activity relationship between the organic structure and the electrochemical performance of the HFEs. Moreover, we have established the linear free‐energy relationship between the structural properties of the electrolyte cosolvents and the polysulfide shuttle effect in lithium–sulfur batteries. These findings provide valuable mechanistic insight into the polysulfide shuttle effect in lithium–sulfur batteries, and are instructive when it comes to selecting the most suitable HFE electrolyte cosolvent for different battery systems.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1560181
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 31 Vol. 131; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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