A new lithium-ion conducting glass electrolyte, xLi(2)O-(1-x)(ySeO(2)-(1 - y)B2O3) was prepared by melt quenching technique and characterized using various analytical techniques. 0.5Li(2)O-0.5(ySeO(2)-(1 - y)B2O3) glass shows typical mixed-former behavior and the conductivity increased significantly compared with binary Li2O-B2O3 glass with a maximum conductivity close to 10(-6) S/cm at y = 0.5. Based on FT-IR and DSC analyses, SeO2 acts either glass modifier or glass former as the composition of SeO2 changes. The glass transition temperature is found to be about 300 degreesC, and the glass is electrochemically stable without any significant decomposition reaction between 0 and 5 V (vs. Li/Li+).