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A kind of preparation method of carbon negative electrode slurry

A negative electrode slurry, slurry technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of slurry retention performance decline, material sedimentation, affecting the coating process of active material layer, etc., to improve stability , improve the degree of compounding, and avoid the effect of settlement

Active Publication Date: 2021-04-02
宇恒电池股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the volume of silicon-based alloys changes greatly. Although the capacity is high, the cycle performance is not as high as that of carbon-based negative electrodes. Under the current requirements for high-capacity and high-cycle performance of negative electrodes, carbon and silicon-based alloys are now mostly made of Composite electrodes, but the common slurrying of different materials will easily lead to the sedimentation of the substances in the slurry, and the retention performance of the slurry will decrease, thus affecting the coating process of the active material layer

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  • A kind of preparation method of carbon negative electrode slurry

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Embodiment 1

[0023] 1), provide natural graphite and artificial graphite, the average particle diameter of described natural graphite is 4 μ m, aspect ratio is 2, and D10 is 2 μ m, and D90 is 10 μ m; The average particle diameter of described artificial graphite is 200nm, and aspect ratio is 1;

[0024] 2) Add deionized water into the first vacuum stirred tank, keep the temperature of the first vacuum stirred tank at 10°C, add SBR and sodium carboxymethylcellulose into the first vacuum stirred tank in turn, and stir for 5 hours , to obtain a dispersed clear solution, add the natural graphite, stir for 2h, then add artificial graphite and carbon nanotubes, stir for 5h, and the stirring speed is 20r / min to obtain the first slurry, wherein the mass ratio is natural graphite: artificial graphite : SBR: sodium carboxymethyl cellulose: carbon nanotubes=100:15:3:3:1, the solid content of the first slurry is 50%;

[0025] 3), providing a silicon-carbon composite material and the artificial graphi...

Embodiment 2

[0029] 1), provide natural graphite and artificial graphite, the average particle diameter of described natural graphite is 8 μ m, aspect ratio is 4, and D10 is 3 μ m, and D90 is 12 μ m; The average particle diameter of described artificial graphite is 800nm, and aspect ratio is 1.05;

[0030] 2) Add deionized water into the first vacuum stirred tank, keep the temperature of the first vacuum stirred tank at 15°C, add SBR and sodium carboxymethylcellulose into the first vacuum stirred tank in turn, and stir for 8 hours , to obtain a dispersed clear solution, add the natural graphite, stir for 3h, then add artificial graphite and carbon nanotubes, stir for 8h, and the stirring speed is 50r / min to obtain the first slurry, wherein the mass ratio is natural graphite: artificial graphite : SBR: sodium carboxymethyl cellulose: carbon nanotubes=100:25:5:5:3, the solid content of the first slurry is 55%;

[0031] 3), providing a silicon-carbon composite material and the artificial gra...

Embodiment 3

[0035] 1), provide natural graphite and artificial graphite, the average particle diameter of described natural graphite is 6 μ m, aspect ratio is 3, and D10 is 3 μ m, and D90 is 10 μ m; The average particle diameter of described artificial graphite is 500nm, and aspect ratio is 1.05;

[0036] 2) Add deionized water into the first vacuum stirred tank, keep the temperature of the first vacuum stirred tank at 15°C, add SBR and sodium carboxymethylcellulose into the first vacuum stirred tank in turn, and stir for 6h , to obtain a dispersed clear solution, add the natural graphite, stir for 3h, then add artificial graphite and carbon nanotubes, stir for 6h, and the stirring speed is 30r / min to obtain the first slurry, wherein the mass ratio is natural graphite: artificial graphite : SBR: sodium carboxymethyl cellulose: carbon nanotubes=100:20:4:4:2, the solid content of the first slurry is 55%;

[0037] 3), providing a silicon-carbon composite material and the artificial graphite, ...

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Abstract

The invention provides a preparation method of carbon negative electrode slurry. A first graphite material, a second graphite material and a silicon-carbon composite material with different structuresare provided. The first graphite material and part of the second graphite material are mixed to prepare first slurry, the silicon-carbon composite material is mixed with the rest part of the second graphite material to prepare second slurry, and then the second slurry is added into the first slurry. The carbon negative electrode slurry obtained by the method provided by the invention has good dispersion performance and retention performance, and an obtained negative electrode has relatively good high-rate performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of carbon negative electrode slurry. Background technique [0002] Lithium battery negative electrode materials are roughly divided into the following categories: The first is carbon negative electrode materials: the negative electrode materials that have been actually used in lithium ion batteries are basically carbon materials, such as artificial graphite, natural graphite, and mesophase carbon microspheres. , petroleum coke, carbon fiber, pyrolytic resin carbon, etc. The second is alloy-based negative electrode materials: including tin-based alloys, silicon-based alloys, germanium-based alloys, aluminum-based alloys, antimony-based alloys, magnesium-based alloys and other alloys. At present, silicon-based alloys have been successfully commercialized. However, the volume of silicon-based alloys changes greatly. Although the capacity is high, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/583H01M4/621H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 谈益
Owner 宇恒电池股份有限公司