Halogen‐Rich Lithium Argyrodite Solid‐State Electrolytes: A Review

Abstract

AbstractExploring solid electrolytes (SEs) with high ionic conductivity, excellent chemical/electrochemical stability, and excellent compatibility with electrodes is important for promoting the development of all‐solid‐state batteries (ASSBs). Halogen‐rich lithium argyrodite electrolytes have received a lot of attention recently due to their ultrahigh room‐temperature lithium‐ion conductivity and relatively low cost. In this review, the properties of the halogen‐rich argyrodite electrolytes are presented in terms of their crystal structure, ionic conduction mechanism, and compatibilities with oxide cathode and Li‐metal anode. Secondly, the preparation process of SE film and the performances of ASSBs based on this electrolyte are summarized. Finally, the challenges and the next research directions of the electrolytes are proposed. Halogen‐rich lithium argyrodite electrolytes are one of the promising sulfide electrolytes, the collation of this paper can provide us with a better understanding of the current development status of this type of electrolyte and advance their further development.