Preparation of Li3PS4 solid electrolyte by liquid-phase shaking using organic solvents with carbonyl group as complex forming medium

Abstract

Li3PS4 was synthesized from the reaction of Li2S and P2S5 in several kinds of organic solvents with a carbonyl group, i.e. dimethyl carbonate (DMC), ethyl acetate (EA) and methyl propyl ketone (MPK) as a complex forming medium by liquid-phase shaking. XRD results showed that Li2S still existed in the sample prepared using MPK, whereas the reaction between Li2S and P2S5 completed in DMC and EA media which then resulted in the formation of co-crystalline complex for EP and low crystalline complex for DMC, respectively. Ionic conductivities of Li3PS4 obtained using MPK, MDC and EP were 3 × 10-7, 6 × 10-6, and 2 × 10-4 Scm-1 at room temperature, respectively. The results pointed out that ester group was suitable for facilitation of the reaction between Li2S and P2S5.