A Universal Solid Reaction Enabling Nanosized LiS in an Amorphous Matrix for All-Solid-State Li-S Batteries.

Lithium sulfide (LiS), a key cathode material for all-solid-state lithium-sulfur (Li-S) batteries, faces challenges such as low electronic and ionic conductivities and limited active material utilization during cycling. In this study, we developed a new cathode featuring nanosized LiS embedded in an amorphous LiFeS matrix (92LiS@8LiFeS). Benefiting from the mixed electronic and ionic conductivities of LiFeS along with its catalytic effect and the nanosized LiS that shortens electron and ion transport distances, this 92LiS@8LiFeS cathode exhibits long-term cycling stability with a capacity retention of over 99% after 320 cycles.