Quasi-solid electrolytes using a single-cation ionic liquid

Abstract

Proof-of-concept quasi-solid electrolytes (QSEs) combining Li_1+x+yAl_xTi_2−xSi_yP_3−yO₁₂ and a single-cation ionic liquid (SCIL) composed of lithium bis(fluorosulfonyl)amide and lithium (fluorosulfonyl)(trifluoromethanesulfonyl)amide are demonstrated without inducing concentration gradients. The QSEs exhibited ionic conductivities comparable to the SCIL without high-temperature sintering. These results demonstrate the potential of SCIL-based QSEs as model systems for investigating Li⁺ transport under concentration-gradient-free conditions in solid-state battery systems.