Title:
PREPARATION METHOD FOR LITHIUM DIFLUOROPHOSPHATE
Document Type and Number:
WIPO Patent Application WO/2024/008206
Kind Code:
A1
Abstract:
The present application provides a preparation method for lithium difluorophosphate, and belongs to the technical field of lithium battery additive preparation. The preparation method for lithium difluorophosphate comprises the following steps: 1) respectively introducing a mixed solution of ethylene glycol and a catalyst, i.e. p-toluenesulfonic acid, and phosphoric acid into a micro-channel reactor for reaction, so as to obtain a diphosphate-containing mixture; 2) rectifying and purifying the diphosphate-containing mixture to obtain a diphosphate; 3) mixing an activated anhydrous fluorinating agent, antimony pentafluoride and an anhydrous organic solvent, adding the diphosphate dropwise, and performing a reaction after the addition is finished, so as to obtain bis-difluorophosphate; and 4) adding the bis-difluorophosphate dropwise to a mixed solution of a lithium source and anhydrous glycol dimethyl ether, and performing a reaction after the addition is finished, so as to obtain lithium difluorophosphate. The preparation method for lithium difluorophosphate provided in the present application is efficient, green and safe; the reaction raw materials have a low cost and are easily available; and the prepared product has a high purity and a high yield.
Inventors:
JIA GUOWEN (CN)
ZHU ZHENTAO (CN)
WANG WEIJIANG (CN)
MA LIJUN (CN)
ZHU ZHENTAO (CN)
WANG WEIJIANG (CN)
MA LIJUN (CN)
Application Number:
PCT/CN2023/111387
Publication Date:
January 11, 2024
Filing Date:
August 07, 2023
Export Citation:
Assignee:
HAIKE GROUP RESEARCH INSTITUTE OF INNOVATION & TECH (CN)
International Classes:
C01B25/455
Foreign References:
| CN115650201A | 2023-01-31 | |||
| CN114604844A | 2022-06-10 | |||
| CN113044825A | 2021-06-29 | |||
| CN108018715A | 2018-05-11 | |||
| CN107285293A | 2017-10-24 | |||
| CN113148971A | 2021-07-23 | |||
| CN114832752A | 2022-08-02 | |||
| JP2016011220A | 2016-01-21 |
Attorney, Agent or Firm:
QINGDAO LAWSCI INTELLECTUAL PROPERTY CO., LTD. et al. (CN)
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