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Coated modified anhydrous lithium hydroxide and preparation method thereof

An anhydrous lithium hydroxide, modified technology, applied in the direction of lithium oxide; / hydroxide, electrochemical generator, electrical components, etc. Lithium-ion battery self-discharge and other problems, to improve the internal atmosphere of the kiln, reduce the influence of the kiln atmosphere and sintering, and improve the performance of low gas production

Inactive Publication Date: 2021-02-02
湖南永杉锂业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In industrial production, the volatilization of dust will cause harm to the human body, and it is prone to water absorption, which makes the main content of lithium ions unstable during production, and impurities such as Ca, Pb, Zn, and Cl are added during the preparation process, which will make the positive electrode material of the battery The magnetic substances in the lithium-ion battery exceed the standard, causing the self-discharge problem of the lithium-ion battery

Method used

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  • Coated modified anhydrous lithium hydroxide and preparation method thereof
  • Coated modified anhydrous lithium hydroxide and preparation method thereof
  • Coated modified anhydrous lithium hydroxide and preparation method thereof

Examples

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Embodiment 1

[0038]A coating modified anhydrous lithium hydroxide of the present invention includes anhydrous lithium hydroxide and a coating layer coated on the surface of the anhydrous lithium hydroxide, and the coating layer material is ester organic matter (2, 2, 4 -Trimethyl-1,3-pentanediol monoisobutyrate).

[0039]The preparation method of the coated modified anhydrous lithium hydroxide of this embodiment includes the following steps:

[0040](1) Weigh acetone and 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate in a ratio of 74L:1L, and stir them evenly. The stirring speed is 60rpm and the stirring time is 3min. ;

[0041](2) Weigh 25 kg of lithium hydroxide monohydrate with a particle size D50 of 480 μm, and mix it with the mixed solvent obtained after step (1), the stirring speed is 70 rpm, and the stirring time is 5 min;

[0042](3) Put the monohydrate lithium hydroxide mixed solution obtained in step (2) into a sand mill, the speed of the sand mill is 420r / min, and the sanding time is 180min;

[004...

Embodiment 2

[0046]A coating modified anhydrous lithium hydroxide of the present invention includes anhydrous lithium hydroxide and a coating layer coated on the surface of the anhydrous lithium hydroxide, and the coating layer material is alkane organics (n-nonane).

[0047]The preparation method of the coated modified anhydrous lithium hydroxide of this embodiment includes the following steps:

[0048](1) Weigh acetone and n-nonane according to the ratio of 73.5L:1.5L, and stir them evenly, the stirring speed is 60rpm, and the stirring time is 3min;

[0049](2) Weigh 18.75kg of lithium hydroxide monohydrate with a particle size D50 of 480μm (the SEM image is asFigure 5Shown), and mix with the mixed solvent obtained after step (1) evenly, the stirring speed is 70rpm, and the stirring time is 5min;

[0050](3) Put the monohydrate lithium hydroxide mixed solution obtained in step (2) into a sand mill, the speed of the sand mill is 420r / min, and the sanding time is 180min;

[0051](4) Put the sand-milled lithium...

Embodiment 3

[0054]A coating modified anhydrous lithium hydroxide of the present invention includes anhydrous lithium hydroxide and a coating layer coated on the surface of the anhydrous lithium hydroxide. The coating layer material is a lipid organic matter (C12-14 fatty acid) .

[0055]The preparation method of the coated modified anhydrous lithium hydroxide of this embodiment includes the following steps:

[0056](1) Weigh n-hexane and C12-14 fatty acid according to the ratio of 73L:2L, and stir evenly, the stirring speed is 60rpm, and the stirring time is 3min;

[0057](2) Weigh 15 kg of lithium hydroxide monohydrate with a particle size D50 of 480 μm, and mix it evenly with the mixed solvent obtained after step (1), the stirring speed is 70 rpm, and the stirring time is 5 minutes;

[0058](3) Put the monohydrate lithium hydroxide mixed solution obtained in step (2) into a sand mill, the speed of the sand mill is 420r / min, and the sanding time is 180min;

[0059](4) Put the sand-milled lithium hydroxide mo...

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Abstract

The invention discloses coating modified anhydrous lithium hydroxide, which comprises an anhydrous lithium hydroxide matrix and a coating layer coating the surface of the anhydrous lithium hydroxide matrix, and the material of the coating layer is selected from one or more of alkane with a carbon atom number of 6-20, an alkane derivative, olefin, alkyne, alcohol, ether or ester. The invention alsodiscloses a preparation method, which comprises the following steps of: (1) adding a coating material into a solvent, and uniformly mixing the substances to obtain a mixed solution; (2) adding lithium hydroxide monohydrate into the mixed solution obtained in the step (1), and uniformly mixing and stirring the substances to obtain a mixture; and (3) drying the mixture obtained in the step (2) to obtain the coated modified anhydrous lithium hydroxide. The surface of the anhydrous lithium hydroxide is coated with the physical coating layer, air can be effectively isolated, and the anhydrous lithium hydroxide has the advantages of low water absorption rate, good particle fluidity and no dust phenomenon, and does not have obvious water absorption and caking phenomena after sealed storage for 60 days.

Description

Technical field[0001]The invention belongs to the field of lithium ion battery materials, and in particular relates to a coated modified anhydrous lithium hydroxide and a preparation method thereof.Background technique[0002]Lithium hydroxide is one of the indispensable cathode materials in lithium ion batteries. The battery-grade lithium hydroxide used in industrial production is generally lithium hydroxide monohydrate. For this reason, many researchers focus on removing the crystal water of lithium hydroxide monohydrate, aiming to increase the main content of lithium ions during industrial production, increase the amount of sintered bowls, and reduce production costs.[0003]The publication number is CN110803709A. The patent document discloses a method for preparing anhydrous lithium hydroxide by centrifugal spray drying. The patent mentions that under the protection of nitrogen, impurity lithium hydroxide monohydrate (7LiOH) is dried by spray centrifugation, condensed and separated,...

Claims

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Application Information

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IPC IPC(8): C01D15/02H01M4/485H01M10/0525
CPCC01D15/02C01P2002/88C01P2004/03C01P2004/61H01M4/485H01M10/0525Y02E60/10
Inventor 戴晓宇王立中曾冬吉戴梓宜
Owner 湖南永杉锂业有限公司
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