Li2S-P2S5 solid electrolyte (SE) powders were successfully reprecipitated from a liquid phase. Powders of 80Li(2)S center dot 20P(2)S(5) (mol %) SE originally prepared by mechanical milling were dissolved in N-methylformamide (NMF) and a homogeneous solution was obtained. The NMF solution was dried at 150 degrees C for 3 h under vacuum to obtain precipitates. The main structural unit in the obtained powder was PS43-. The crystalline phase of the powders was confirmed to be Li3PS4, and ionic conductivity was 2.6 x 10(-6) cm(-1).