This article uses potassium hexafluorophosphate and lithium chloride as raw materials,acetonitrile as solvent,to prepare lithium hexafluorophosphate through mixing reaction,recrystallization,and vacuum disassembly.X-ray diffraction analysis,Fourier transform infrared spectroscopy analysis,etc.were conducted on the products from the preparation,recrystallization,and disassembly processes to analyze the rea-sons for the high free acid content.The experimental method was improved.The experimental results showed that the addition of trace water in the raw material during the preparation of lithium hexafluorophosphate after rotary evaporation was the reason for the high acid value of the prod-uct,and the purity of the lithium hexafluorophosphate product reached commercial standards.
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