Preparation method of lithium difluoroborate

A technology of lithium difluorooxalate borate and lithium tetrafluoroborate is applied in chemical instruments and methods, compounds containing elements of Group 3/13 of the periodic table, organic chemistry, etc., and can solve problems such as poor quality of lithium difluorooxalate borate , to achieve the effect of improving the purity, reducing the production cost, and the preparation process is simple and safe.

Active Publication Date: 2021-03-12
DO FLUORIDE CHEM CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation method of lithium difluorooxalate borate, to solve the problem of poor quality of lithium difluorooxalate borate existing in the existing preparation method

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  • Preparation method of lithium difluoroborate

Examples

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Embodiment 1

[0024]The preparation process of lithium boric acid acid salted acid salted acid isfigure 1 As shown, specifically includes the following steps:

[0025](1) in 1#In the reactor, 36.1 g of lithium fluoride (1.39 mol) was reactive with 556 g of hydrogen fluoride (27.8 mol) at a temperature of -40 to -30 ° C for 4 h, and the hydrogen fluoride solution of lithium fluoride was degraded.

[0026](2) Enter the fluoride solution of fluoride into 2#In the reactor, it was uniformly stirred, and 62.5 g of anhydrous ethaffin (0.694 mol) was added to the reactor, and 162.5 g of trichloride gas (1.39 mol) was slowly delivered from the bottom of the reactor (uniform and continuous access. The time is 2 h); the reaction temperature is controlled between 15 to 20 ° C during the addition of the addition; during the reaction, the resulting exhaust gas is discharged from the top of the reactor to absorb and remove hydrochloric acid having a concentration of 20% after hydrogen fluoride. 780G;

[0027](3) After t...

Embodiment 2

[0030]The preparation method of lithium boric acid acid salted acid, including the following steps:

[0031](1) in 1#In the reactor, 200 kg of fluorinated lithium fluoride (7.72 kmol) was 0.2 h at a temperature of 1540 kg of no hydrogen fluoride (77 kmol) at -20 to 0 ° C, and the hydrogen fluoride solution of lithium fluoride was obtained.

[0032](2) Put the hydrofluoric acid solution of lithium fluoride into 2#In the reactor, the stirring was mixed, 346 kg of anhydrous ethaffin (3.8 kmol) was added, and 1080 kg of a boron tap gas (9.2 kmol) was passed from the bottom of the reactor (uniform and continuous access, the entry time was 3 h); the feed process The control reaction temperature is between 5 to 15 ° C; during the reaction, the resulting gas is discharged from the top of the reactor to absorb the two-stage refinement film and remove hydrogen fluoride. 3710 kg;

[0033](3) After the endo-boron gas is processed, the mixture is continued for 30 min to complete the reaction, then the re...

Embodiment 3

[0037]The preparation method of lithium boric acid acid salted acid, including the following steps:

[0038](1) in 1#In the reactor, 1000 kg of lithium fluoride (38.6 kmol) was reactive with 3080 kg of no hydrogen fluoride (154 kmol) at 10 to 20 ° C for 2 h, and the fluoride solution of lithium fluoride was degraded.

[0039](2) Enter the fluoride solution of fluoride into 2#In the reactor, the stirring was mixed, and 1900 kg of anhydrous oxycidal acid (21.1 kmol) was added, and 6753 kg of a boron tantramid (57.6 kmol) was transferred from the bottom of the reactor (uniformly continuous access, the access time was 4 h); The control reaction temperature is between 5 and 10 ° C; during the reaction, the resulting gas is discharged from the top of the reactor to absorb and remove hydrogen hydrogen acid after hydrogen fluoride. 18450 kg;

[0040](3) After the completion of trichloride gas is formed, stirring is continued for 30 min to complete the reaction, and then the reaction liquid is filter...

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and particularly relates to a preparation method of lithium difluoroborate. The preparation method of lithium difluoroborate comprises the following steps: subjecting a hydrogen fluoride solution of lithium fluoride to reacting with boron trichloride and oxalic acid at 5-20 DEG C to obtain a hydrogen fluoride solution containing lithium difluoroborate and lithium tetrafluoroborate, removing a solvent to obtain a solid mixture oflithium difluoroborate and lithium tetrafluoroborate, and carrying out separation and purification to obtain lithium oxalyldifluoroborate. The invention provides a novel process for preparing lithium difluoroborate, the operation process is simple and safe, and the prepared lithium difluoroborate is high in purity and suitable for industrial production.

Description

Technical field[0001]The present invention belongs to the technical field of lithium ion battery materials, and more particularly to the preparation method of lithium boric acid acid acid acid acid.Background technique[0002]Lithium boricate (LiODFB) binds to lithium boric acid acid salted boric acid and lithium tetrafluorobicate, has excellent thermal stability, excellent working temperature limit, high and low temperature performance, and a new lithium salt having development potential. Electrolyte.[0003]The prior art uses lithium tetrafluoroborate and anhydrous acid in the prior art reaction in an organic solvent (such as dial ester, etc.), and lithium boric acid borate is prepared, and the organic solvent is used in the preparation process. The organic solvent has strong irritating and strong corrosiveness, encountering fire burning, bringing harm to the health and production environment, and has a high corrosion resistance of the equipment, the investment cost is large, which is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F5/02
CPCC07F5/022
Inventor 刘海霞耿梦湍薛旭金杨明霞李云峰李凌云薛峰峰王建萍王永勤
Owner DO FLUORIDE CHEM CO LTD
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