Inorganic Solid Electrolytes for the Lithium-Ion Batteries

Liquid lithium-ion batteries have fatal safety problems such as flammability, explosion, and short-circuit, as well as technical problems such as cruising range anxiety. The development of lithium- ion batteries with good safety performance and high energy density is an urgent need for industrial development. Compared with traditional liquid lithium-ion batteries, all-solid-state batteries have the advantages of safe use and high theoretical specific capacity, so they have been extensively studied and are known as the mainstream technology of next-generation batteries. Among them, the inorganic solid electrolyte plays an important role in the all-solidstate battery, and scientific researchers at home and abroad have conducted a lot of research work on this. This article introduces the latest developments in different types of inorganic solid electrolytes, including oxide solid electrolytes, sulfide solid electrolytes, and halide solid electrolytes. The researches on interface problems, crystal structure, preparation methods, and doping modification of inorganic solid electrolytes are also elaborated. Finally, the problems to be solved in inorganic solid electrolytes in recent years are discussed, and the future research directions are also given.