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Negative electrode slurry as well as preparation method and application thereof

A technology of negative electrode slurry and negative electrode sheet, which is applied in the field of negative electrode slurry and its preparation, can solve problems such as difficult coating process, impact on battery performance, high solid content of slurry, etc., achieve good dispersion uniformity and improve dispersion effect , the effect of preventing reunion

Inactive Publication Date: 2021-02-12
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After silicon is added to graphite as the negative electrode material, the ordinary homogenization and stirring process cannot meet the requirements of uniform dispersion of the slurry. There are high solid content and high viscosity in the slurry, which causes difficulties in the coating process and greatly affects the performance of the battery cell. influences

Method used

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  • Negative electrode slurry as well as preparation method and application thereof
  • Negative electrode slurry as well as preparation method and application thereof
  • Negative electrode slurry as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] This embodiment provides a kind of negative electrode slurry, by the percentage of dry powder, described negative electrode slurry comprises:

[0064]

[0065] The negative electrode active material is a mixture of graphite and silicon oxide, the mass percentage of silicon oxide is 20%, the thickener is sodium carboxymethyl cellulose, the binder is styrene-butadiene rubber, and the conductive agent is conductive carbon black.

[0066] The preparation method of described negative electrode slurry comprises the following steps:

[0067] (1) Mix the conductive agent, dispersant, negative electrode active material and a part of deionized water (accounting for 20% of the total mass of deionized water) in proportion, and stir for 20 minutes at a rotating speed of 10 rpm to obtain the first mixed solution;

[0068] (2) Add a part of the thickener (accounting for 30% of the total mass of the thickener) to the first mixed solution obtained in step (1), stir for 10 minutes at ...

Embodiment 2

[0073] This embodiment provides a kind of negative electrode slurry, by the percentage of dry powder, described negative electrode slurry comprises:

[0074]

[0075] The negative electrode active material is a mixture of graphite and silicon oxide, the mass percentage of silicon oxide is 15%, the thickener is sodium carboxymethyl cellulose, the binder is styrene-butadiene rubber, and the conductive agent is conductive carbon black.

[0076] The preparation method of described negative electrode slurry comprises the following steps:

[0077] (1) Mix the conductive agent, dispersant, negative electrode active material and a part of deionized water (accounting for 15% of the total mass of deionized water) in proportion, and stir for 20 minutes at a rotating speed of 10 rpm to obtain the first mixed solution;

[0078] (2) Add a part of the thickener (accounting for 20% of the total mass of the thickener) in proportion to the first mixed solution obtained in step (1), stir for ...

Embodiment 3

[0083] This embodiment provides a kind of negative electrode slurry, by the percentage of dry powder, described negative electrode slurry comprises:

[0084]

[0085] material, the mass percentage of silicon oxide is 20%, the thickener is sodium carboxymethyl cellulose, the binder is styrene-butadiene rubber, and the conductive agent is conductive carbon black

[0086] The preparation method of described negative electrode slurry comprises the following steps:

[0087] (1) Mix the conductive agent, dispersant, negative electrode active material and a part of deionized water (accounting for 15% of the total mass of deionized water) in proportion, and stir for 20 minutes at a rotating speed of 10 rpm to obtain the first mixed solution;

[0088] (2) Add a part of the thickener (accounting for 25% of the total mass of the thickener) in proportion to the first mixed solution obtained in step (1), stir at a speed of 30 rpm for 10 min, and then stir at a speed of 40 rpm for 35 min...

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Abstract

The invention relates to negative electrode slurry as well as a preparation method and application thereof. The negative electrode slurry comprises a negative electrode active substance, a thickeningagent, a binding agent, a conductive agent, a dispersing agent and water; the negative electrode active substance comprises graphite and a silicon-based material; the dispersing agent comprises sodiumtripolyphosphate; the mass percentage content of the sodium tripolyphosphate is 0.5-3.0% by taking the mass of the negative electrode slurry as 100%. According to the negative electrode slurry provided by the invention, a proper amount of sodium tripolyphosphate is added, the effects of deflocculating the negative electrode slurry and stabilizing component particles can be achieved, and the agglomeration of the component particles in a storage process is prevented, so that the stability and the flowability of the negative electrode slurry are improved, and the dispersion effect is enhanced.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a negative electrode slurry and its preparation method and application. Background technique [0002] With the rapid development of lithium-ion batteries, the capacity requirements for negative electrode materials are getting higher and higher. Graphite negative electrodes, as the main negative electrode materials, have been widely used, but the capacity of graphite negative electrode materials has reached 360mAh / g, which is close to 372mAh. / g of theoretical gram capacity, it is difficult to realize the space to increase it. The chemical properties of silicon and carbon are similar, and silicon can be alloyed with lithium at room temperature to form Li 15 Si 4 Phase, the theoretical specific capacity is as high as 3572mA.h / g, which is much higher than the theoretical specific capacity of commercial graphite. It is very abundant in the earth's crustal elements, l...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/04H01M4/13H01M10/0525H01M10/42
CPCH01M4/04H01M4/13H01M4/62H01M10/0525H01M10/4235Y02E60/10
Inventor 邢诗娜
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD