METHOD OF PREPARING HIGH-PURITY LITHIUM DIFLUOROPHOSPHATE CRYSTAL AND NON-AQUEOUS ELECTROLYTE SOLUTION FOR SECONDARY BATTERY INCLUDING THE CRYSTAL

The present invention relates to a method of preparing a lithium difluorophosphate crystal. More particularly, the present invention relates to a method of preparing a high-purity lithium difluorophosphate crystal at a high yield, and the high-purity lithium difluorophosphate crystal prepared by the method can be used for various purposes.