Lipophilic Additives for Highly Concentrated Electrolytes in Lithium-Sulfur Batteries

Work performed at Argonne National Laboratory (JCESR managing partner) by Lau, K.-C., Rago, N. L. D., and Liao, C. Lipophilic Additives for Highly Concentrated Electrolytes in Lithium-Sulfur Batteries. 2019, 166, A2570-A2573.

Scientific Achievement

Developed a lipophilic additive, tetrabutylammonium iodide (TBAI), for highly concentrated electrolytes and tested its electrochemical performance in lithium-sulfur batteries.

Significance and Impact

There is significant fundamental and technological gap for highly-concentrated electrolytes development, and the TBA additive would be an effective way to improve electrochemical performance through interfacial modification between a concentrated solution and electrode.

Research Details

  • Introduced TBAI to concentrated electrolyte (CH3CN)2LiTFSI/TTE (TTE = 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether) for Li-S batteries.
  • The lipophilic TBA+ cation delivered the active component in the additive, I−, into the concentrated electrolyte, and the in situ generated I2 removed sulfur deposits on the lithium surface.

DOI: 10.1149/2.0921912jes

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