Recent Advances in Interface Engineering for All-Solid-State Batteries

All-solid-state batteries are attractive energy storage devices with high stability and energy density due to their non-flammable solid electrolytes that can utilize lithium and allow cells to be stacked directly in series. It is essential to develop superior solid interfaces for its commercialization by improving the interfacial stability and kinetics. However, complex interfacial phenomena in both solid electrolyte/cathode and solid electrolyte/anode make the interfacial problem of all-solid-state batteries difficult to solve. To overcome this issue, the origins of high resistance and low stability at solid interfaces have been widely explored and alternatives have been proposed accordingly. In this paper, the main methodologies and recent advances for solving the solid electrolyte/electrode interface problems will be reviewed in the chemical, electrochemical, and mechanical aspects.