Li 10 GeP 2 S 12 solid electrolytes synthesised via liquid-phase methods.

Li 10 GeP 2 S 12 solid electrolytes for all-solid-state batteries were synthesised through liquid-phase shaking, which is a suspension synthesis method, in 1 d. Additionally, Li 10 GeP 2 S 12 solid electrolytes were prepared in 7.5 h, which is the fastest synthesis time, through solution synthesis using excess sulfur and a mixed solvent of acetonitrile, tetrahydrofuran, and ethanol. These Li 10 GeP 2 S 12 solid electrolytes exhibited an ionic conductivity of 1.6 × 10 -3 S cm -1 , which is the highest ionic conductivity of previous studies of liquid phase synthesis. Therefore, Li 10 GeP 2 S 12 solid electrolytes with high ionic conductivity can be rapidly synthesised via liquid-phase methods.