CoS2@Li7P3S11 nanocomposites cathode enabled High-performance all-solid-state Li-based batteries with ultrahigh capacity

All-solid-state Li-batteries have become viable options for energy storage materials over-commercialized Li-ion batteries due to their safety, wider electrochemical stability window, and impressive energy density. All-solid-state Li-based batteries use sulfide-based electrodes with high theoretical specific capacity and ionic conductivity, whereas solid electrolytes have recently shown improved energy density. However, using Li-based batteries in all-solid-state batteries for practical purposes is still a great challenge because of their interfacial issues among the solid electrolytes and electrodes. To elucidate these interfacial issues, this study presents an in-situ liquid-phase approach to prepare CoS 2 @Li 7 P 3 S 11 as the electrode for all-solid-state Li-batteries by coating Li 7 P 3 S 11 solid electrolyte on cobalt disulfide nanoparticles. Originating from enhanced intimate contact and improved area of contact in the solid electrolyte of sulfide and active material, the synthesized CoS 2 @Li 7 P 3 S 11 nanocomposites employed as a cathode in all-solid-state Li-battery, which shows the ultrahigh cyclic stability and reversible capacity. All-solid-state Li-based batteries consist of CoS 2 @Li 7 P 3 S 11 nanocomposites, Super P, neat Li 7 P 3 S 11 as cathode material, and Li metal as an anode electrode material ( Li-75 %Li 2 S-24 %P 2 S 5 -1 %P 2 O 5 /Li 7 P 3 S 11 /CoS 2 @Li 7 P 3 S 11 /Li). At low (100 mA/g) and high (1000 mA/g) current density, exhibits an 1112.6 mAh/g reversible discharge capacity after 30 cycles and 208.4 mAh/g after 200 cycles, respectively.