The Polymer Society of Korea

Abstract

Superionic conductors are critical for the realization of all-solid-state batteries (ASSBs), yet current sulfide, oxide, and polymer electrolytes face significant limitations regarding cost, safety, and mechanical interface stability. In this talk, we introduce a novel class of inorganic molecular superionic conductors, exemplified by lithium aluminum oxychloride. Unlike conventional crystalline solids that lack plasticity or polymers that sacrifice conductivity for deformability, this material is an amorphous solid composed of densely packed inorganic molecules. It uniquely exhibits polymer-like mechanical plasticity while maintaining fully inorganic chemistry. This property enables intimate solid–solid interfacial contact, addressing a fundamental bottleneck in ASSB integration. Combined with high ionic conductivity (>1 mS/cm), excellent flame retardancy, and low-cost synthesis, this material offers a viable pathway for next-generation solid electrolytes.