Li₁₀GeP₂S₁₂固体電解質の湿式合成ならびにそのイオン伝導特性

抄録

A crystalline solid electrolyte, Li₁₀GeP₂S₁₂ (LGPS), was synthesized by a two-step wet process. In the first step, solvated Li₄GeS₄ was prepared by mixing Li₂S and GeS₂ powders in EtOH solvent for 3 days at 60°C. The solvated Li₄GeS₄ was dried in vacuum at room temperature. In the second step, the obtained Li₄GeS₄ was reacted with Li₂S and P₂S₅ in THF solvent for 3 days at 60°C. After a vacuum drying of the precursor, the crystalline phase of Li₁₀GeP₂S₁₂ was obtained by a heat treatment at 550°C for 1hr in vacuum. The Li₁₀GeP₂S₁₂ sample showed high ion conductivity of 1.0 x 10^-2 Scm^-1 at room temperature. The wet synthesis of the solid electrolyte has advantages for mass-production of all-solid-state batteries.