Abstract: Owing to their favorable oxidative stability, high ionic conductivity, and good mechanical processability, halide solid-state electrolytes have emerged as promising electrolyte candidates for all-solid-state batteries. With the development of systems such as chloride, oxychloride, and nitride-chloride, halide solid-state electrolytes have made significant progress in ionic transport performance and structural regulation. However, these materials are still mainly at the stage of laboratory-scale preparation and cell validation, and issues such as scalable preparation, batch-to-batch consistency, and manufacturing cost remain key factors restricting their commercialization. This review mainly summarizes the major preparation methods, including ball milling, solid-state sintering, solution-based synthesis, vapor-phase deposition, and related hybrid processing strategies. The characteristics of different processes in terms of structural regulation and scalable preparation potential are compared, and the challenges faced by halide solid-state electrolytes in moving from laboratory preparation toward large-scale manufacturing are analyzed, thereby providing a reference for process optimization, scalable preparation, and application research of halide solid-state electrolytes in all-solid-state batteries.

Key words: Halide solid-state electrolytes, All-solid-state batteries, Preparation strategies, Scalable preparation