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.