Lithium oxide based amorphous material and process for preparation thereof

摘要

Disclosed is a lithium oxide based amorphous material having a composition included in a region defined by lines connecting points A, B, C and D in the composition diagram of the ternary system of Li2O.SiO2.P2O5 shown in FIG. 1 of the accompanying drawings. This amorphous material can be formed by performing sputtering by using as a target a mixture of a lithium silicate/lithium phosphate composition and LiO2. This amorphous material is excellent in the ionic conductivity.