TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The method comprises (b) contacting the formed lithium difluorophosphate containing a reaction mixture in the step (a) with an organic solvent, where the formed lithium difluorophosphate at least partly goes into the solution, and (c) optionally separating solid particles from the solution containing lithium hexafluorophosphate. The lithium fluoride used in the step (a): has a purity degree of 98-99.9999 wt.%, preferably 99.97-99.9995 wt.% based on anhydrous product; and comprises foreign ions including 0.1-250 ppm, preferably 0.5-5 ppm of sodium in ionic form, 0.01-200 ppm, preferably 0.1-1 ppm of potassium in ionic form, 0.05-500 ppm, preferably 0.5-100 ppm of calcium in ionic form and/or 0.05-300 ppm, preferably 0.5-50 ppm of magnesium in ionic form. The step (a) is carried out: in a fixed bed or a fluidized bed; and at a reaction pressure of 500 hPa to 5 Mpa, preferably 1500 hPa to 0.5 Mpa. The lithium fluoride used is produced by the method comprising providing an aqueous medium containing dissolved lithium carbonate, reacting the aqueous medium with gaseous hydrogen fluoride to an aqueous suspension of solid lithium fluoride, separating the solid lithium fluoride from the aqueous suspension, and drying the separated lithium fluoride. The phosphorus pentafluoride is prepared by the method comprising reacting phosphorus trichloride with hydrogen fluoride to phosphorus trifluoride and hydrogen chloride, reacting phosphorus trifluoride with elemental chlorine to give phosphorus dichloride trifluoride, and reacting phosphorus dichloride trifluoride with hydrogen fluoride to give phosphorus pentafluoride and hydrogen chloride or by reacting tetraphosphorus decaoxide with hydrogen fluoride. Preferred Components: The organic solvent is liquid at room temperature, has a boiling point of less than or equal to 300 degrees C and at a pressure of 1013 hPa, and further comprises at least one oxygen atom and/or nitrogen atom. The organic solvents are nitriles, esters, ketones, ethers, amides or sulfones at room temperature. EXAMPLE - No suitable example given.