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High-viscosity lithium ion battery slurry blending technology

A lithium-ion battery, high-viscosity technology, applied in battery electrodes, circuits, mixing methods, etc., can solve the problems of increasing the difficulty of mixing and dispersing processes, long stirring time, low production efficiency, etc., to improve the long stirring time and simplify the process flow. , the effect of improving production efficiency

Inactive Publication Date: 2017-08-22
湖北猛狮新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the conventional lithium-ion battery slurry mixing, dispersing and stirring process, the particle size of the raw material powder is getting smaller and larger or the specific surface area is larger. While improving the performance of the lithium-ion battery, it is also very easy to form secondary aggregates, making the slurry The dispersion is not uniform, which increases the difficulty of the mixing and dispersing process, and the stirring time is long and the production efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Using a mass percentage meter, the positive electrode slurry production includes the following steps:

[0023] (1) Mix the total solid matter of 1.5% polyvinylidene fluoride, 96.0% lithium cobaltate, and 2.5% conductive carbon black into the stirring tank, with a revolution of 23-25rpm and an autorotation of 300-600rpm, Dry mixing for 15 minutes, after dry mixing, scrape off the agglomeration sticking to the stirring paddle and tank wall and put it into the mixing tank;

[0024] (2) Then add 33.0% N-methylpyrrolidone solvent of the total solid mass, rotate at 18-20rpm, rotate at 300-600rpm, maintain a vacuum degree of -0.65MPa, and maintain a temperature of 55±5°C, kneading for 15 minutes ;

[0025] (3) Then add 20.0% N-methylpyrrolidone solvent of the total solid mass, rotate at 18-20rpm, rotate at 300-600rpm, maintain a vacuum degree of -0.65MPa, and maintain a temperature of 55±5°C, kneading for 15 minutes ;

[0026] (4) Then disperse for 240 minutes at a revoluti...

Embodiment 2

[0035] Using a mass percentage meter, the positive electrode slurry production includes the following steps:

[0036] (1) Mix the total solid matter of 2.0% polyvinylidene fluoride, 95.5% lithium cobaltate, and 2.5% conductive carbon black into the stirring tank, with a revolution of 23-25rpm and an autorotation of 300-600rpm, Dry mixing for 15 minutes, after dry mixing, scrape off the agglomeration sticking to the stirring paddle and tank wall and put it into the mixing tank;

[0037] (2) Then add 32.0% N-methylpyrrolidone solvent of the total solid mass, rotate at 18-20rpm, rotate at 300-600rpm, maintain a vacuum degree of -0.65MPa, and maintain a temperature of 55±5°C, kneading for 15 minutes ;

[0038] (3) Then add 23.0% N-methylpyrrolidone solvent of the total solid mass, rotate at 18-20rpm, rotate at 300-600rpm, maintain a vacuum degree of -0.65MPa, and maintain a temperature of 55±5°C, kneading for 15 minutes ;

[0039] (4) Then disperse for 210 minutes at a revoluti...

Embodiment 3

[0048] Using a mass percentage meter, the positive electrode slurry production includes the following steps:

[0049](1) Mix the total solid matter of 1.5% polyvinylidene fluoride, 96.5% lithium cobaltate, and 2.0% conductive carbon black into the stirring tank, with a revolution of 23-25rpm and an autorotation of 300-600rpm, Dry mixing for 15 minutes, after dry mixing, scrape off the agglomeration sticking to the stirring paddle and tank wall and put it into the mixing tank;

[0050] (2) Then add 33.5% N-methylpyrrolidone solvent of the total solid mass, rotate at 18-20rpm, rotate at 300-600rpm, maintain a vacuum degree of -0.65MPa, and maintain a temperature of 55±5°C, kneading for 15 minutes ;

[0051] (3) Then add 25.0% N-methylpyrrolidone solvent of the total solid mass, rotate at 18-20rpm, rotate at 300-600rpm, maintain a vacuum degree of -0.65MPa, and maintain a temperature of 55±5°C, kneading for 15 minutes ;

[0052] (4) Then disperse for 240 minutes at a revolutio...

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Abstract

A high-viscosity lithium ion battery slurry blending technology is used for stirring of positive and negative slurries for a lithium ion battery and comprises the following steps: admixing an adhesive, a conductive agent, a thickening agent and an active substance into a stirring barrel, dry-blending, adding a solvent, wetting and kneading and dispersing, and finally filtering by the use of a filter screen so as to obtain slurry. Through dry-blending and kneading stirring process and by application of high-speed shearing force and mechanochemical force, the conductive agent covers around the granular active substance, and the adhesive is uniformly distributed in the active substance so as to obtain the uniformly-dispersed and stable slurry placed for a long time. By the technology, stirring time is shortened, production efficiency is raised, and cost is reduced. The preparation technology is simple and flexible, is suitable for large-scale slurry blending for lithium ion batteries, especially applicable to materials with small particle size and large specific surface area, and is a high-viscosity slurry mixing technology with a high-solid-content formula.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-viscosity lithium-ion battery slurry mixing process. Background technique [0002] In the conventional lithium-ion battery slurry mixing, dispersing and stirring process, the particle size of the raw material powder is getting smaller and larger or the specific surface area is larger. While improving the performance of the lithium-ion battery, it is also very easy to form secondary aggregates, making the slurry The dispersion is uneven, which increases the difficulty of the mixing and dispersing process, and the stirring time is long and the production efficiency is low. Contents of the invention [0003] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a high-viscosity lithium-ion battery slurry mixing process to improve the uniformity of the slurry, ensure the consistency of battery performance, sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139B01F3/18B01F3/12
CPCH01M4/139B01F23/53B01F23/565B01F23/60Y02E60/10
Inventor 汤元波
Owner 湖北猛狮新能源科技有限公司
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