Preparation of Amorphous Materials in the System Lil-Li₂S-SiS₂ by Mechanical Milling and Their Lithium lon Conducting Properties

Abstract

Lithium-ion-conducting amorphous materials in the system LiI-Li₂S-SiS₂ were prepared by use of high-energy ball-milling methods at room temperature. Crystalline LiI, Li₂S, and SiS₂ reagents were used as raw materials for the sample preparation. The amorphous materials were obtained in the composition range of x = 0 to x = 30 in xLiI⋅(100-x)(0.6Li₂S ⋅0.4SiS₂) and xLiI⋅(100-x)(0.5Li₂S ⋅0.5SiS₂) (mol%) notations. The obtained amorphous materials showed high lithium ion conductivities in the range of 1 x 10^-4 to 7 x 10^-4 Scm^-1at room temperature depending on their compositions. The conductivity increased with an increase in the LiI contents. The transport number of Li⁺ ions was almost unity for the obtained amorphous materials.