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.
- 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.