All-solid-state lithium secondary batteries with SnS-P₂S₅ electrodes and Li₂S-P₂S₅ solid electrolytes

Abstract

Sulfide glassy materials in the system SnS-P₂S₅were prepared by mechanical milling. Thermal properties and local structure were examined for the obtained materials. All-solid-state cells were fabricated with the SnS-P₂S₅ glasses as an electrode and highly conductive Li₂S-P₂S₅ glass-ceramics as an electrolyte. Because of using a common P₂S₅ component, a continuous sulfide network between electrolyte and electrode would be formed in the cells. An All-solid-state cell 80SnS•20P₂S₅ / 80Li₂S•20P₂S₅ / LiCoO₂ exhibited excellent charge-discharge performances at room temperature. The average cell potential was 3.3 V and the cell retained high capacities over 400 mAh/g during charge-discharge cycling for 50 times.