Title:
METHOD FOR PREPARING LITHIUM DIFLUOROPHOSPHATE
Document Type and Number:
WIPO Patent Application WO/2018/066896
Kind Code:
A2
Abstract:
The present invention relates to a method for preparing lithium difluorophosphate, and more specifically, a method for preparing lithium difluorophsphate, which enables simple and economical preparation of lithium difluorophosphate, which is a lithium salt used in an electrolyte for a lithium secondary battery, at high purity and high yield without a dangerous process. By using an organic silyl halide mixture rather than expensive siloxane which has been used for preparing lithium difluorophosphate, the method for preparing lithium difluorophosphate, according to the present invention, is economical, enables obtaining of high-purity lithium difluorophosphate having low amounts of various impurities, and ensures safety due to low corrosiveness during a process. In addition, the present invention enables preparation of high-yield and high-purity lithium difluorophosphate by means of a simple process without particular refinement, whereas in existing preparation methods, inevitable byproducts such as chloride or insoluble matters are generated and thus impurities should be removed by means of an extra process. Further, by reacting a bis(chlorosulfonyl)amine compound, which is a starting material, with water (H2O) and organic silyl halide, the present invention can solve the problems in the prior art and enables simple and economical preparation of high-purity and high-yield lithium difluorophosphate without a dangerous process.
Inventors:
LIM KWANG MIN (KR)
Application Number:
PCT/KR2017/010853
Publication Date:
April 12, 2018
Filing Date:
September 28, 2017
Export Citation:
Assignee:
LIM KWANG MIN (KR)
International Classes:
C01D15/00; C01B25/30; C01B25/455; C07F7/12
Attorney, Agent or Firm:
TAEBAEK INTELLECTUAL PROPERTY LAW FIRM (KR)
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