All-Solid-State Batteries (ASSBs) are next-generation rechargeable batteries in which the flammable liquid electrolyte used in conventional lithium-ion batteries is replaced with a non flammable solid electrolyte.

Liquid electrolyte-based batteries are prone to safety issues such as leakage, fire, and explosion, and also face limitations in increasing energy density. In contrast, ASSBs are gaining attention as a promising technology that can achieve both high energy density and enhanced safety, thanks to their excellent thermal and chemical stability, wide electrochemical window, and compatibility with lithium metal anodes.

As various types of solid electrolytes including sulfide-based, oxide-based, and halide-based systems are actively being developed, the advancement of ASSB technology continues to accelerate.

Our laboratory focuses on sulfide-based solid electrolytes, particularly those with the argyrodite-type structure based on Li₆PS₅Cl, aiming to improve their ionic conductivity and electrochemical stability through structural and compositional modifications.