Innovative Research on Solid-State Electrolyte Materials for Solid-State Batteries

Solid-state batteries, utilizing solid electrolytes, are emerging as a promising next-generation energy storage technology due to their superior safety, energy density, and lifespan. This study investigates key performance bottlenecks in solid-state electrolytes, with a focus on enhancing ionic conductivity, interfacial stability, and maneuverability for large-scale industrial applications. We conduct a comparative analysis of ion conduction mechanisms, structural characteristics, and interfacial behaviors across different types of solid-state electrolytesoxide, sulfide, polymer, and hairslide systems. Current solid electrolyte systems exhibit diverse properties and limitations. Polymer electrolytes show ionic conductivity in the range of ~1010 Scm, while sulfide electrolytes range from ~1010 Scm. However, interface resistances often exceed 100 cm without surface modifications. Significant progress has been made in hybrid and interface engineering, such as LLZO polymer composites and sulfide@oxide coatings, which reduce contact resistance by 4070%. An ideal electrolyte system capable of balancing high ionic conductivity, chemical stability, and maneuverability remains elusive. To facilitate industrialization, critical challenges such as processing temperature limits, air sensitivity, and cost-effective material handling must be addressed.