METHOD FOR PURIFYING DIFLUOROPHOSPHATE

摘要

Provided is a method for purifying difluorophosphate which includes a step of mixing difluorophosphate containing impurities with at least one type of processing agent selected from the group consisting of a carbonate, hydroxide, or halogenide of an alkaline metal or an alkaline earth metal, and an amine, and separating the impurities. After mixing the impurities with the processing agent to form a salt or a complex, the salt or the complex is preferably filtered out by filtration. As the processing agent, the carbonate, hydroxide, or halogenide of alkaline metal is preferably used, and a carbonate, hydroxide, or halogenide of lithium is more preferably used.