Thin-film deposition techniques in surface and interface engineering of solid-state lithium batteries

Extensive efforts have been dedicated to improving the physical and (electro)chemical properties of solid electrolytes in pursuit of promising all-solid-state batteries (ASSBs). Nevertheless, increasing studies has demonstrated the critical impact of interface issues on battery performance. Hence, the primary focus of this review is on the utilization of thin-film deposition techniques (TFDTs) in surface and interface engineering of ASSBs. First, we explain the issues associated with solid-solid interfaces. Second, the working mechanism and advantages/disadvantages of TFDTs are briefly introduced. Third, we summarize the existing studies and highlight notable progress in the anode and cathode interfaces of ASSBs. The interface of all-solid-state thin-film batteries (ATFBs) is also discussed. Lastly, we conclude the relevant scientific problems of TFDTs application in ASSBs interface engineering, and provide future directions and prospects.