Advancing High-voltage Halide-based Solid-state Batteries: Interfacial Challenges, Material Innovations, and Applications

Abstract

All-solid-state batteries represent a promising avenue for next-generation energy storage systems, offering the potential for high energy density and enhanced safety. Among solid-state electrolytes, halide solid-state electrolytes stand out due to their superior ionic conductivities, oxidation stability, and mechanical moldability. However, several challenges remain, particularly at the interface between halide solid-state electrolytes and ultra-high voltage cathodes, resulting in suboptimal electrochemical performance. This review systematically examines the interfacial issues that hinder the performance of halide-based all-solid-state batteries, focusing on interfacial reactions, mechanical failure, and suboptimal ion/electron transport. Furthermore, we explore three strategies to address these challenges: electrolyte design and refinement, cathode surface modification, and composite cathode preparation. We also discuss the practical challenges of transitioning from laboratory research to industrial-scale applications, offering a roadmap for future advancements in high-performance halide-based all-solid-state batteries.