At present, domestic mainstream LiPF6 manufacturers mainly use HF solvent method, but they have their own characteristics in the specific process. 1. Dofluoro Chemical Co., Ltd Dofluoropoly Chemical Co., Ltd. has invented a double kettle HF solvent method to prepare LiPF6, and the process is shown in Figure 4. First, PCl5 reacts with anhydrous HF to obtain the mixed solution of PF5 and anhydrous HF, then prepare the anhydrous HF solution of LiF, add it to the mixed solution, and obtain high-purity LiPF6 cryst