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Lithium bis (fluorosulfonyl) imide, preparation method of lithium bis (fluorosulfonyl) imide, electrolyte and secondary battery

A technology of lithium bisfluorosulfonimide and triethylamine, which is used in secondary batteries, circuits, electrical components, etc., can solve the problems of high moisture, three wastes, and low purity.

Pending Publication Date: 2022-04-15
CONTEMPORARY AMPEREX TECH CO +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] This application is carried out in view of the above-mentioned problems, and its purpose is to provide a method for preparing lithium bisfluorosulfonyl imide to solve the problems of low product purity, high moisture content, high production cost and three wastes involved in the preparation of LiFSI in the prior art. many questions

Method used

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  • Lithium bis (fluorosulfonyl) imide, preparation method of lithium bis (fluorosulfonyl) imide, electrolyte and secondary battery
  • Lithium bis (fluorosulfonyl) imide, preparation method of lithium bis (fluorosulfonyl) imide, electrolyte and secondary battery
  • Lithium bis (fluorosulfonyl) imide, preparation method of lithium bis (fluorosulfonyl) imide, electrolyte and secondary battery

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Embodiment 1

[0147] 【Synthesis step→Evaporation step→Extraction step】

[0148] combine figure 1 To describe the α-stage process (synthesis→evaporation→extraction), where the extraction process uses an extraction tower.

[0149] will be 40m 3 Triethylamine, 35m 3 Acetonitrile is pumped into a volume of 100m 3 In the synthesis kettle, the temperature of the kettle is lowered to 15°C, then 120kg of ammonia gas is introduced first, and finally ammonia gas (2000kg) and sulfuryl fluoride (26000kg) are simultaneously introduced to keep the pressure in the kettle at 0.3MPa, and the The temperature was maintained at 15°C. After continuing the reaction for 4 h, the pressure in the kettle was reduced to 0.1 MPa, and the stirring was stopped. The obtained reaction mixture stream α1 (which contains 40% by weight of (SO 2 F-NH-SO 2 F)·Et 3 N, 18% by weight of triethylamine hydrogen fluoride and 6% by weight of triethylamine) are filtered through a tetrafluoro filter bag with a pore size of 5 μm ...

Embodiment 2

[0159] Embodiment 2: the technical scheme of embodiment 2 is identical with embodiment 1, difference is, in extraction step, what extraction process adopted is static mixer (the ratio L / D=10 of length and pipe diameter; Control flow makes deionization The weight ratio of water to α2 is 1:1.2). according to figure 2 As shown, the material flow α2 is pumped to the static mixer, and after being fully mixed with deionized water in the static mixer, it is sent to the stratification tank, and after standing for 2 hours, triethylamine-containing hydrogen fluoride is obtained as the supernatant Aqueous phase of salt alpha 水 , and containing (SO 2 F-NH-SO 2 F)·Et 3 The oil phase α3 of N, the upper water phase is sent to the recovery workshop for processing, and the lower oil phase is sent to the alkalization step. After testing, the α3 oil phase contains 1000ppm of F - .

[0160] After testing, the purity of the powder obtained by drying the above-mentioned lithium bisfluorosul...

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Abstract

The invention relates to a method for preparing lithium bis (fluorosulfonyl) imide. The method comprises the following steps: (a) a synthesis step; (b) an evaporation step; (c) an extraction step; (d) an alkalization step; (e) a dehydration step; (f) a desolventizing step; and optionally (g) a refining step. The method provided by the invention can solve the problems of low product purity, high moisture, high production cost and more three wastes in LiFSI preparation in the prior art.

Description

technical field [0001] The present application relates to a method for preparing lithium bisfluorosulfonyl imide, lithium bisfluorosulfonyl imide prepared by the method, an electrolyte containing the lithium bisfluorosulfonyl imide, and a secondary battery thereof. Background technique [0002] Due to its special molecular structure, lithium bisfluorosulfonyl imide (LiFSI) makes it possible to obtain higher conductivity by adding LiFSI to the electrolyte. At the same time, LiFSI also has the characteristics of high thermal stability, wide electrochemical window, and low corrosion rate. Especially in power batteries, it can improve the cycle performance and rate performance of power batteries. Excellent choice. [0003] The synthesis and purification of LiFSI in the prior art has many problems in industrialized large-scale production. The synthesis process is cumbersome, the process is long, the product conversion rate is low, and the consumption of raw and auxiliary materia...

Claims

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Application Information

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IPC IPC(8): C01B21/086H01M10/0567H01M10/0525
CPCC01B21/086H01M10/0567H01M10/0525
Inventor 程思聪黄起森
Owner CONTEMPORARY AMPEREX TECH CO
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