Quasi-solid electrolytes using a single-cation ionic liquid.

Proof-of-concept quasi-solid electrolytes (QSEs) combining Li1+x+yAlxTi2-xSiyP3-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.