Low-Temperature Synthesis of the Li₂S-P₂S₅ Electrolytes by a Milling Process Combined with Heat Treatment

Abstract

Reaction mechanism during the mechanical milling synthesis of sulfide based solid electrolytes in the system Li₂S-P₂S₅ was investigated in order to develop a speedy preparation process of the solid electrolytes. The sample preparation by using only milling process without heat treatment did not cause the increase in ion conductivity of the samples. On the other hand, the preparation process by using not only the milling but also heat treatments at a temperature around 210°C resulted in the increasing of lithium ion conductivity of the samples. This result suggested that the milling process combined with the heat treatment was very effective to prepare the amorphous samples in the system Li₂S-P₂S₅ with high ion conductivity.