Halide-based Solid Electrolytes: Opportunities and Challenges in Synergistic Development of All-Solid-State Li/Na Batteries

Abstract

In the ever-evolving wave of energy storage technologies, all-solid-state batteries (ASSBs) have garnered significant attention due to their high energy density, long cycle life and intrinsic safety, being regarded as a necessary step of next-generation batteries. Halide-based solid electrolytes have emerged as promising candidates for next-generation ASSBs owing to their superior oxidative stability and tunable high ionic conductivity. This review aims to provide a comprehensive overview of the latest advances and state-of-the-art research progress in Li- and Na-based halide electrolytes. The common synthesis strategies, various categories of halide-based electrolytes, and their ion transport mechanisms are introduced in detail. Furthermore, various modification strategies for improving ionic conductivity, air stability and electrochemical stability are also discussed. Finally, we the insights into current challenges and future perspectives of the halide-based electrolytes are also put forward. We anticipate that this review can serve as a guide for the design and understanding of halide-based electrolytes and promote their further advancement in the application of ASSBs toward energy storage.