Preparation method and application of lithium tetrafluoro oxalate phosphate

The invention discloses a preparation method of lithium tetrafluoro oxalate phosphate, which comprises the following steps: S1, mixing lithium hexafluorophosphate, an organic solvent and trimethylchlorosilane to obtain a mixed solution 1; s2, after oxalic acid is dispersed, the oxalic acid is added into the mixed solution 1 to react, and a mixed solution of lithium difluoro bis (oxalate) phosphate is obtained; the molar ratio of the lithium hexafluorophosphate to the oxalic acid is 1: (2.0-2.5). The preparation method of the lithium tetrafluoro oxalate phosphate is provided on the first aspect, the reaction condition is mild, implementation is easy, methyl chlorosilane reacts with a byproduct hydrogen fluoride generated in the reaction, non-corrosive trimethylfluorosilane is generated, and the safety of the whole technological process is improved. 本发明公开了一种四氟草酸磷酸锂的制备方法，包括如下步骤：S1：将六氟磷酸锂、有机溶剂和三甲基氯硅烷混合，得到混合液1；S2：将草酸分散后，加入混合液1中反应即得到二氟双草酸磷酸锂的混合液；按摩尔比计，所述六氟磷酸锂与所述草酸为1：2.0～2.5。本发明的第一方面提出了一种四氟草酸磷酸锂的制备方法，本发明反应条件温和，易于实现，