SUMMARY

All SOlid-state Lithium Ion Batteries (ALSOLIBs) offering high energy density and power density are considered as one of the next generation electrochemical energy storage technologies. It is in urgent need to develop high-performance solid electrolytes (SEs), which is the key component of ALSOLIBs, satisfying the requirements in multiple categories of properties, including high ionic conductivity at ambient temperature, good chemical and electrochemical stability, and good mechanical durability. Among various type of SEs, sulfide and halide electrolytes show promising ionic conductivity and favorable synthesizability, which are beneficial for the ALSOLIBs fabrication. In this work, the structural factors such as polarizability of anions framework, anions disordering, Li ions sublattice have been tuned through various Li ionic conductor systems and their influences on ionic conductivity were systematically studied. We believe this work is beneficial to advance the mechanistic understanding of Li ion diffusion behavior in sulfide and halide SEs to pave the way towards high performance ALSOLIBs.