New advances in solid-state electrolytes: from halides to oxyhalides

Abstract

The emerging area of halide solid electrolytes has garnered significant interest due to its superior ionic conductivity, broad electrochemical stability range, and strong compatibility with positive electrode materials. In recent times, there has been a continuous emergence of diverse halide systems. This study provides a comprehensive review of the synthesis strategies classification schemes, structural attributes, ion transport mechanisms, and modified means of halides. Notably, the paper delves into a detailed analysis of the structural details and ion conduction mechanisms of several representative halides. Furthermore, this review also examines the intrinsic connection between the recently discovered oxyhalides and halides and figures out the primary obstacles and prospective directions for advancement through a thorough review and analysis.