Li-Ag alloy anode with interfacial silver layer for all-solid-state lithium metal batteries utilizing Li3InCl6 halide solid electrolyte

Halide solid state electrolyte with Li3InCl6 structure has attracted growing attention due to its good deform-ability, high ionic conductivity, and good compatibility with high-voltage cathode. However, Li3InCl6 undergoes intense interface side reaction with Li metal anode. To this end, a silver interface layer is introduced between Li and Li3InCl6 through a simple cold pressing method to form a Li-Ag anode. The Ag buffer layer prevents the direct contact between Li and Li3InCl6, thus suppresses the interfacial side reaction and the formation of voids and Li dendrites. The Li diffusion kinetics has also been improved due to the formation of Li-Ag alloy phase. Li-Ag/Li3InCl6/Li-Ag symmetric cell exhibits a high critical current density of 1.3 mA cm-2 and a long life-span of 500 h at 0.1 mA cm-2. This work provides a simple and economical solution for stabilizing the interface between Li3InCl6 halide solid electrolyte and Li metal anode.