Interface protective layer based on plastic crystal composite electrolyte

Solid electrolytes are the key to realizing the good safety, reliability, and high performance of all-solid-state lithium batteries. As one of the most promising solid-state electrolytes, arginite-type solid electrolytes have an ionic conductivity greater than 10 −3 S cm −1 at room temperature, which is close to that of liquid electrolytes. Its advantages are relatively good electrochemical stability and low cost of preparation of raw materials. However, there is still the problem of poor electrode interface compatibility. In our study, the LATP electrolyte with high ionic conductivity was prepared by a simple ball-milling and sintering method, and then a plastic crystal electrolyte based on succinonitrile was used as the interface layer. stability. And we used Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 solid electrolyte powder as filler, so metal lithium and LATP can be effectively isolated, thereby suppressing side reactions at the interface. This solution completely solves the side reactions and solid-solid contact problems between metallic lithium and LATP, enabling LiFePO 4 (LFP)-based solid-state batteries to exhibit good cycling stability.