MANUFACTURING METHOD FOR LITHIUM DIFLUOROPHOSPHATE POWDER, AND LITHIUM DIFLUOROPHOSPHATE

摘要

[Problem] To provide a manufacturing method with which lithium difluorophosphate powder can be recovered from a lithium difluorophosphate solution. [Solution] A manufacturing method for lithium difluorophosphate powder, said method characterized by including a step in which solid lithium difluorophosphate is precipitated by adding a poor solvent to a solution in which lithium difluorophosphate is dissolved in a main solvent, and a step in which lithium difluorophosphate powder is obtained by solid–liquid separation of the solid lithium difluorophosphate from the liquid containing the main solvent and the poor solvent, wherein the relational expression between the octanol/water partition coefficient PP of the main solvent and the octanol/water partition coefficient PA of the poor solvent is defined by formula (1): PA ≥ -4/3 × PP + 1.2.