| abstract |
LiPO 2 F 2 , an electrolyte salt additive for batteries, is manufactured by the reaction of POF 3 , PF 5 or mixtures thereof, with Li 3 PO 4 forming a reaction mixture comprising LiPO 2 F 2 . When POF 3 is applied, the reaction mixture which contains essentially only LiPO 2 F 2 is preferably extracted from the reaction mixture with a solvent which also is applicable as solvent for lithium ion batteries. If PF 5 is applied, then, depending on the molar ratio of PF 5 and Li 3 PO 4 , the reaction mixture also contains LiF and/or LiPF 6 . To isolate pure LiPO 2 F 2 from LiF, the reaction mixture containing essentially only LiPO 2 F 2 and LiF may for example, be extracted with dimethoxyethane, acetone, dimethyl carbonate or propylene carbonate. To isolate pure LiPO 2 F 2 from LiPF 6 , the reaction mixture containing essentially only these constituents is preferably extracted with a solvent which also is applicable as solvent for the LiPF 6 in lithium ion batteries to dissolve and remove LiPF 6 . |