Solid electrolytes Na_10+xSn_1+xP_2−xS₁₂ prepared via a mechanochemical process

Abstract

Solid electrolytes are important materials for enhancing the performance of all-solid-state sodium rechargeable batteries. Na_10+xSn_1+xP_2−xS₁₂ (0 ≤ x ≤ 1.2) samples were prepared using a mechanochemical process, followed by heat treatment and their structures and ionic conductivities were investigated. Glassy samples were obtained via the mechanochemical process; the samples with the Na₁₁Sn₂PS₁₂ type crystal structure were obtained for all the prepared compositions through the heat treatment of the glasses. The Na₁₁Sn₂PS₁₂ (x = 1) sample obtained by heat treatment at 300 °C exhibited an ionic conductivity of 2.6 × 10⁻⁴ S cm⁻¹ at 25 °C, which was the highest conductivity observed among all the samples with Na_10+xSn_1+xP_2−xS₁₂ (0 ≤ x ≤ 1.2) compositions.