Manufacturing method for lithium hexafluoro phosphate
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United States of America Patent
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May 14, 2002
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N/A
app pub date -
Dec 29, 1999
filing date -
Dec 31, 1998
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Abstract
A method of preparing lithium hexafluoro phosphate (LiPF.sub.6) using phosphorous pentachloride (PCl.sub.5), lithium chloride (LiCl), and hydrogen fluoride (HF) as raw materials. The method includes the steps of: (a) reacting the phosphorous pentafluoride with the hydrogen fluoride to prepare phosphorous pentafluoride (PF5), and (b) reacting the phosphorous pentafluoride with the lithium chloride in a hydrogen fluoride to prepare the lithium hexafluoro phosphate. Also, in this method, anhydrous hydrogen fluoride, from which moisture was removed by treating with F.sub.2 gas, is used in the steps (a) and (b), and the step (b) further comprises contacting the reaction system of the step (b) with F.sub.2 gas. Accordingly, as the method adopts relatively cheap raw materials, such as PCl.sub.5, LiCl and the like, while a highly pure F.sub.2 obtained by an electrolysis is used in the reaction system, it has an advantage in that it enables lithium hexafluoro phosphate (LiPF.sub.6) to be prepared at a high yield and purity.
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