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.