The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 14, 2002
Filed:
Dec. 29, 1999
Ulsan Chemical Co., Ltd., Ulsan, KR;
Abstract
A method of preparing lithium hexafluoro phosphate (LiPF ) using phosphorous pentachloride (PCl ), 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 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 gas. Accordingly, as the method adopts relatively cheap raw materials, such as PCl , LiCl and the like, while a highly pure F obtained by an electrolysis is used in the reaction system, it has an advantage in that it enables lithium hexafluoro phosphate (LiPF ) to be prepared at a high yield and purity.