Research progress on interface of solid composite electrolyte and anode in lithium-metal batteries

Compared with traditional lithium-ion batteries, all-solid-state lithium-metal batteries (ASS LMBs) have attracted much attention due to their high safety and high energy density. However, the solid-solid contact of electrodes with solid electrolyte brings large interfacial impedance. Besides, the active lithium metal reacts with most solid electrolytes, leading to unstable interface. So interfacial problem has been one of the key issues to limit the development of ASS LMBs. Solid composite electrolytes with the advantages of inorganic solid electrolytes and organic solid electrolytes, have higher ionic conductivity and certain mechanical strength, showing excellent promising in the light of practical application. The research progress on interface amelioration of solid composite electrolyte and lithium anode was summalized in this review. The main strategy includes constructing a "soft contact" at the interface, adjusting the mechanical performance of the solid electrolyte and tuning the deposition dynamics of lithium ions. Furthermore, the perspectives on interfacial modification were presented.