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Lithium-ion conducting glass-ceramic electrolyte in the composition 75Li 2 S•5P 2 S 3 •20P 2 S 5 (mol%) was prepared by heat-treatment of an amorphous precursor. The amorphous precursor was obtained by a high-energy ball-milling process. The glass-ceramic showed high ion conductivity 2.0 x 10-3 Scm-1 at room temperature. Raman scattering measurements suggested that the glass-ceramic essentially composed of thio-phosphate anions, PS 4 3and P 2 S 6 4-, as structural units. A laboratory-scale all-solid-state battery was also assembled by use of the glass-ceramic as solid electrolytes and LiNi 1/3 Mn 1/3 Co 1/3 O 2 powders as positive electrode materials. The all-solid-state battery showed good charge-discharge cycle performance at room temperature under a constant current density of 0.1 mAcm-2 .

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