Preparation method and production device of lithium difluorophosphate

The invention discloses a preparation method and a production device of lithium difluorophosphate, the preparation method comprises the following steps: (1) lithium hexafluorophosphate and siloxane react in an organic solvent to obtain lithium difluorophosphate and fluorosilane, and the molar ratio of siloxane to lithium hexafluorophosphate is 5-20% of the stoichiometric ratio of siloxane to lithium hexafluorophosphate; and (2) hydrolyzing the fluorosilane in an aqueous solution of pure water, organic alkali, inorganic alkali or acid to obtain siloxane, drying the siloxane obtained by hydrolysis, and returning to the step (1). The use amount of siloxane can be reduced to 5-20% of the stoichiometric amount, the cost is greatly saved, the process is simple, safe and environment-friendly, the product purity is high, and the prepared product can be directly used for preparing the lithium ion battery electrolyte without purification. 本发明公开了一种二氟磷酸锂的制备方法及生产装置，所述制备方法包括：(1)六氟磷酸锂与硅氧烷在有机溶剂中反应获得二氟磷酸锂和氟硅烷，所述硅氧烷与六氟磷酸锂的摩尔用量