Abstract:With the rapid development of electric vehicles, the safety of lithium-ion batteries has attracted much more attention. At present, solid-state electrolytes are considered to be the key materials to solve the problems of hidden danger and cycle ability of traditional liquid-state lithium metal batteries. However, solid state electrolyte suffers from low ionic conductivity and high interface impedance, which still limits the development of Solid-state lithium battery. In recent years, organic-inorganic composite electrolyte based on inorganic packing and polymer electrolyte has attracted much more attention. The organic inorganic composite solid electrolyte has the advantages of both polymer and inorganic filler, on one hand, it can raise the flexibility and retention, on the other hand, the mechanical performance can be improved effectively. In this review, different types of organic polymers and inorganic metal oxide composite solid electrolytes were summarized. The effects of different inorganic metal oxide and Inorganic-organic composite solid electrolyte formed by polymer composite on composite interface behavior of lithium batteries, ionic conductivity and the mechanical properties of batteries were analyzed as well. Meanwhile, it sorted out the problems and solutions in the preparation and application of composite solid electrolytes. Finally, the predictions for the future problems and development directions of polymer-based composite metal oxide solid electrolytes had been pointed out.