Review—Interfaces: Key Issue to Be Solved for All Solid-State Lithium Battery Technologies

All solid-state lithium batteries (ASSLBs) employing inorganic solid electrolytes or solid polymer electrolytes are attracting increasing interests for electrochemical energy storage devices due to their advantages of high energy density, high safety, wide operating temperature range and long cycle life. However, the large interfacial resistance originated from the insufficient solid-solid contact at electrolyte/electrode interface hinders the development of ASSLBs. In addition, the interfacial stability and compatibility also greatly affect the electrochemical performance of batteries. To realize the ASSLB’s application requires significant research in solid electrolyte materials and solid electrolyte/electrode interfaces. This review summarizes the research and development in solid electrolyte materials and the interfaces of solid electrolyte/electrode, paying special attention to the challenges and progress for the studies of interface issues in ASSLBs. Based on the overview, we attempt to propose approaches to the issue by interface engineering and prospective developments of ASSLBs.