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Production process and production system of lithium difluorophosphate

A lithium difluorophosphate, production process technology, applied in the field of preparation of lithium difluorophosphate, can solve the problems of increased battery internal resistance, high safety risks, fast battery capacity decay, etc., to improve production efficiency, improve safety, The effect of long reaction times

Active Publication Date: 2021-06-29
SINOCHEM LANTIAN +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lithium hexafluorophosphate is the most common electrolyte. When it is used in the electrolyte, the purity of lithium hexafluorophosphate is particularly high, and the impurity content in it must be strictly controlled, otherwise it will lead to increased internal resistance of the battery, rapid decay of battery capacity, and reduced safety.
[0009] In the above-mentioned prior art, the preparation process of lithium difluorophosphate is a batch reaction, which not only has low production efficiency, but also has high safety risks. What is important is that lithium difluorophosphate has low purity, which greatly affects its performance in lithium ion production. Various application performance in the battery

Method used

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  • Production process and production system of lithium difluorophosphate

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Embodiment 1

[0051] Preparation of a mother liquor comprising lithium hexafluorophosphate: Phosphorus vials via a solid conveyor 1 with a metering device is delivered to a hydrogenated pentafluoride generator 2 with a cooling jacket, and the control temperature is about 0 ° C. Pentachloride is immediately reacted with hydrogen fluoride to produce pentafluoride and hydrogen chloride. The mixed gas pentafluoride, hydrogen chloride, and the entrained fluoride gas are introduced into the first microchannel reactor 3, constitute the first feed stream. In the dissolution tank with a cooling jacket and a stirrer, hydrogen fluoride is added, and the lithium fluoride is added to the dissolved groove while cooling while cooling, the crystallol is 0 ° C, and the mass fraction of lithium fluoride is 2 wt%. . The hydrogen fluoride solution of the lithium fluoride is transported into the first microchannel reactor 3 with pump to form a second feed stream. The reaction temperature of the first microchannel r...

Embodiment 2

[0057] The present embodiment contains a mother liquor for lithium hexafluorophosphate is prepared as in Example 1.

[0058] Preparation of fluorophosphate: Pentoxide phosphorus is delivered to a solid conveyor 13 with a metering device to be delivered to a fluoride-containing fluorophosphate 14 with a cooling jacket, and pentoxide is 1.5 kg / min. The rate enters the fluorophosphate reactor to form a fluorophosphate solution to the excess water-free hydrogen fluoride, until the phosphorus phosphorus feed is completed, the temperature is controlled at -10 ° C, wherein the molar ratio of pentoxide and no hydrogen fluorine hydrogen fluoride is : 1: 5.1. The mixed solution of the fluorophosphate containing water is introduced into the reduced pressure distillation device 15, the temperature is at 90 ° C, and the hydrophilic fluorophosphate is stored in the fluorophosphate tank 16.

[0059] Preparation of lithium difluorophosphate: the mother liquor containing lithium hexafluorophosph...

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Abstract

The invention discloses a production process of lithium difluorophosphate. The production process comprises: a fluorophosphoric acid preparation process: reacting phosphorus pentoxide with anhydrous hydrogen fluoride to generate a fluorophosphoric acid solution, and carrying out reduced pressure distillation on the fluorophosphoric acid solution to obtain an anhydrous fluorophosphoric acid solution; a reaction process: introducing the anhydrous fluorophosphoric acid solution and a mother solution containing lithium hexafluorophosphate into a third microchannel reactor to obtain a product flow containing lithium difluorophosphate; and a post-treatment process: filtering the product flow containing the lithium difluorophosphate, and carrying out heating drying or low-temperature crystallization on the filtrate to obtain a lithium difluorophosphate product. The method has the advantages of high product purity, few impurities, high production efficiency, suitability for industrial production and the like.

Description

Technical field [0001] The present invention relates to the preparation of lithium difluorophosphate, and more particularly to a continuous production process and a production system of lithium difluorophosphate in a microchannel reactor. Background technique [0002] Since commercialization, lithium ion batteries has been widely used in digital, energy storage, power, military aerospace and communication equipment, due to its high comparative energy. With the promotion of lithium-ion batteries, higher requirements for the capacity of lithium-ion batteries, cycle performance, magnification performance, charge and discharge performance, cycle life, safety, storage performance, etc. have put forward higher requirements. The electrolyte comprises an electrolyte, a solvent, and an additive, an important part of a lithium ion battery, which has a significant effect on the performance of the battery. [0003] Lithium hexafluorophosphate is the most common electrolyte, and the purity of...

Claims

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Application Information

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IPC IPC(8): C01B25/455C01D15/00H01M10/0525H01M10/056
CPCC01B25/455C01D15/005H01M10/0525H01M10/056C01P2006/80C01P2004/60C01P2004/51Y02E60/10
Inventor 任建纲杨青马小红张海兵刘海岛
Owner SINOCHEM LANTIAN
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