Solid-electrolyte interphases for all-solid-state batteries

Interfacial engineering, particularly the design of artificial solid-electrolyte interphases (SEIs), has been successfully applied in all-solid-state batteries (ASSLBs) for industrial applications. However, a fundamental understanding of the synthesis and mechanism models of artificial SEIs in all-solid-state Li-ion batteries remains limited. In this review, recent advances in designing and synthesizing artificial SEIs for ASSLBs to solve interfacial issues are thoroughly discussed, covering three main preparation methods and their technical routes: 1) atomic layer deposition, 2) sol-gel methods, and 3) mechanical ball-milling methods. Moreover, advanced ex-situ characterization techniques for artificial SEIs are comprehensively summarized. Finally, this review provides perspectives on techniques for the interface engineering of artificial SEIs for ASSLBs, with focus on promising methods for industrial applications.