A partially fluorinated polymer network enhances the Li-ion transference number of sulfolane-based highly concentrated electrolytes.

Gelation of sulfolane-based highly concentrated electrolytes using a partially fluorinated polymer enhances the Li-ion transference number of the electrolytes because acidic protons surrounded by fluorine atoms in the polymer network trap anions, and the high Li transference number is effective in suppressing the concentration polarization in Li batteries.