Solid electrolytes and interfaces in all-solid-state sodium batteries: Progress and perspective

All-solid-state sodium batteries are the promising candidate for the next generation of large-scale energy storage with exceptional safety, reliability and stability. The solid electrolytes are the key components for enabling all-solid-state sodium batteries with high electrochemical performances. The current developments of solid electrolytes were reviewed in this article. In particular, the intrinsic properties of solid electrolytes and the effective approaches for forming intimate interfaces between solid electrolytes and electrodes are deeply discussed. Besides, several directions are also suggested for developing the solid electrolytes and improving the interfacial contacts for future practical applications of all-solid-state sodium batteries.218