A new high-capacity cathode for all-solid-state lithium sulfur battery

Abstract

A new composite sulfur cathode with high sulfur loading for all-solid-state lithium sulfur (LiS) battery, along with an in-situ coating process for preparing this composite cathode, is proposed in this manuscript. This composite cathode includes carbonized cotton fibers as the electron conductive skeleton, sulfide electrolyte coating on the carbon fibers as the Li-ion conductor, and elemental sulfur as the active material. The in-situ coating of sulfide electrolyte is carried out via a liquid-phase process, which results in a close contact between carbon fiber and the sulfide electrolyte. The subsequent mixing and heating treatment with elemental sulfur form a composite cathode with good electrochemical performance. In the assembled all-solid-state LiS battery with Li6PS5Cl electrolyte and lithium metal anode, the composite cathode delivers a super high discharge capacity of 32.8 mAh.