Electrochemical properties for the lithium ion conductive (100-x)(0.6Li(2)S center dot 0.4SiS(2))center dot xLi(4)SiO(4) oxysulfide glasses

Thermal. electrical, and electrochemical properties were investigated for t he (100-x)(0.6Li(2)S.0.4SiS(2)).xLi(4)SiO(4) oxysulfide glasses. The glass with x = 5 exhibited high electrical conductivity of about 10(-3) S cm(-1) at room temperature, high glass stability against crystallization, and good chemical stability in contact with ti metal. Cyclic voltammetry also sugge sted that this glass has a wide electrochemical window of more than 10 V. O n the other hand, further addition of Li4SiO4 up to 20 mol % lowered the co nductivity, glass stability against crystallization, and electrochemical st ability for the oxysulfide glasses. (C) 1999 The Electrochemical Society. S 0013-4651(98)12-042-3. All rights reserved.