Method for reducing content of monosubstituted difluorophosphate lithium trifluoroborate in mixture

The invention discloses a method for reducing the content of monosubstituted difluorophosphate lithium trifluoroborate in a mixture. The method comprises the following steps: (1) obtaining a mixture concentrated solution; (2) adding an organic solvent into the mixture concentrated solution, preserving heat for 0.5-144 hours at the temperature of 60 DEG C below zero to 20 DEG C, separating out crystals, and filtering to obtain a lithium disubstituted difluorophosphate trifluoroborate solution; the organic solvent is selected from at least one of dichloromethane, trichloromethane, tetrachloroethane, isopropanol, methyl tertiary butyl ether, butyl acetate and methylbenzene. The method has the advantages that the operation is simple, the contents of the disubstituted difluorophosphate lithium trifluoroborate and the monosubstituted difluorophosphate lithium trifluoroborate in the product can be freely regulated and controlled, and the like. 本发明公开了一种降低混合物中单取代二氟磷酸基三氟硼酸锂含量的方法，所述方法包括以下步骤：(1)获得混合物浓缩液；(2)在混合物浓缩液中加入有机溶剂