Polymer solid electrolyte

　　Polymer solid electrolyte (SPE), which is composed of polymer matrix (such as polyester, polase and amine) and lithium salt (such as LiClO4, LiAsF4, LiPF6, LiBF4), etc., due to its light weight, good viscoelasticity, and processing properties good. Attracted widespread attention.

　　Oxide solid electrolyte

　　Oxide solid electrolytes can be divided into two types: crystalline and glass (amorphous) according to the material structure. Crystal electrolytes include perovskite type, NASICON type, LISICON type and garnet type. The research hotspot of glass oxide electrolyte is LiPON type electrolyte for thin film battery.

　　Oxide crystalline solid electrolyte

　　Oxide crystal solid electrolytes have high chemical stability and can exist stably in the atmosphere, which is conducive to the large-scale production of all-solid-state batteries. The focus of current research is to improve the ionic conductivity and the compatibility with the electrode at room temperature. At present, the most important method to improve conductivity is element substitution and heterovalent element doping. In addition, the compatibility with the electrode is also an important issue that restricts its application.