High Capacity, Superior Cyclic Performances in All-Solid-State Lithium-Ion Batteries Based on 78Li2S-22P2S5 Glass-Ceramic Electrolytes Prepared via Simple Heat Treatment

Highly Li-ion conductive 78Li(2)S-22P(2)S(5) glass-ceramic electrolytes were prepared by simple heat treatment of the glass phase obtained via mechanical ball milling. A high ionic conductivity of similar to 1.78 X 10(-3) S cm(-1) is achieved at room temperature and is attributed to the formation of a crystalline phase of high lithium-ion conduction. All-solid-state lithium-ion batteries based on these glass-ceramic electrolytes are assembled by using Li2S nanoparticles or low-cost commercially available FeS2 as active cathode materials and Li In alloys as anode. A high discharge capacity of 535 mAh g(-1) is achieved after at least 50 cycles for the all-solid-state cells with Li2S as cathode materials, suggesting a rather high capacity retention of 97.4%. Even for the cells using low-cost FeS2 as cathode materials, same high discharge capacity of 560 mAh g(-1) is also achieved after at least 50 cycles. Moreover, the Coulombic efficiency remain at similar to 99% for these all-solid-state cells during the charge discharge cycles.