| abstract |
Provided are a method for easily preparing high-purity difluorophosphate, and a method for producing an electrolyte using the obtained difluorophosphate, an electrolyte, and a secondary battery. The manufacturing method of difluorophosphate containing the following process (1) or (2). (1) a step of reacting (A) at least one member selected from the group consisting of oxoacid, oxoacid anhydride and oxyhalide of phosphorus and (B) hexafluorophosphate in the presence of hydrogen fluoride (2) A step of reacting at least one halide selected from the group consisting of alkali metal halides, alkali earth halides, aluminum halides and onium halides with difluorophosphoric acid in the presence of hexafluorophosphate. Moreover, the non-aqueous electrolyte secondary battery provided with the non-aqueous electrolyte containing the obtained difluorophosphate, and this non-aqueous electrolyte. |