СПОСОБ ПОЛУЧЕНИЯ КОМПОНЕНТА ЭЛЕКТРОЛИТА НА ОСНОВЕГЕКСАФТОРФОСФАТА ЛИТИЯ

摘要

The invention relates to a method for producing an electrolyte component for a lithium chemical current supply which is embodied in the form of a hexafluorophosphate solution in propylene carbonate with a salt concentration ranging from 20 to 22 mass %. The inventive method consists in obtaining a solution of a LiPF₆· C₅H₅N solvate in a propylene carbonate by reacting pyridinium hexafluorophosphate with lithium hydroxide in said solvent (1g of pyridinium hexafluorophosphate per about 4.5 ml of propylene carbonate), in exposing said solution to azeotropic dehydration with benzol at a residual pressure of 100-150 mm of mercury column and a distillation temperature of 30-35 °C, wherein 1g of removable water requires 37-38 g of benzol, in obtaining the solution of a LiPF₆ · C₅H₅N solvate with a water concentration equal to or less than 0.2 mass %, in distilling a free propylene carbonate together with light products (benzol, pyridinium, residual water) at a temperature equal to or less than 65-70 °C and the residual pressure equal to or less than 1 mm of mercury column and in obtaining a target product with a salt concentration of 20-22 mass % (saturated solution at a temperature of 20-25°C) and a residual water concentration equal to or less than 0.008-0.009 mass %. The dilution of said solution with another suitable solvent makes it possible to produce an electrolyte whose LiPF₆ concentration ranges from 1 to 1.5 mole/liter.