A kind of preparation process of negative electrode slurry for lithium ion battery

A lithium-ion battery, negative electrode slurry technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor dispersion effect, powder drop and sticking roller, unstable viscosity, etc., to solve the problem of powder drop and improve wetting The effect of improving the dispersion effect

Active Publication Date: 2015-07-29
HANGZHOU SKYRICH POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The battery electrode slurry prepared by the above method has problems such as poor dispersion effect, unstable viscosity, sedimentation, powder falling and sticking to the roll.

Method used

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  • A kind of preparation process of negative electrode slurry for lithium ion battery
  • A kind of preparation process of negative electrode slurry for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation process of the lithium-ion battery negative electrode slurry in this embodiment includes the following steps in sequence.

[0027] (1) Selection includes 94 parts by weight of negative active material, 5.2 parts by weight of binder, 1.4 parts by weight of thickener, 2 parts by weight of conductive agent, parts by weight of 94 parts of solvent and 5.5 parts by weight of additives are used as raw materials, wherein the negative electrode active material is graphite, the binder is styrene-butadiene rubber emulsion, the thickener is sodium carboxymethyl cellulose, and the conductive agent is conductive Carbon black, the solvent is water, and the additive is N-methylpyrrolidone. Among them, the solvent is preferably deionized water. The parts by weight of the negative electrode active material in the present invention is usually 88 parts-96 parts, the parts by weight of the binder is usually 4.8 parts-6 parts, the parts by weight of the thickener is usually ...

Embodiment 2

[0036] The preparation process of the lithium-ion battery negative electrode slurry in this embodiment includes the following steps in sequence.

[0037] (1) Selection includes 90 parts by weight of negative active material, 6 parts by weight of binder, 1.6 parts by weight of thickener, 5.4 parts by weight of conductive agent, parts by weight of 100 parts of solvent and 3 parts by weight of additives are used as raw materials, wherein the negative electrode active material is graphite, the binder is styrene-butadiene rubber emulsion, the thickener is sodium carboxymethyl cellulose, and the conductive agent is conductive Carbon black, the solvent is water, and the additive is N-methylpyrrolidone. Among them, the solvent is preferably deionized water.

[0038] (2) Add the thickener in step (1) into the solvent to obtain mixed liquid A. The mixed liquid A is stirred at a high speed for 2.5-4.5 hours at a temperature of 30-40°C. The mixed liquid A is heated by circulating heat T...

Embodiment 3

[0044] The preparation process of the lithium-ion battery negative electrode slurry in this embodiment includes the following steps in sequence.

[0045] (1) Selection includes 92 parts by weight of negative active material, 5.4 parts by weight of binder, 1.5 parts by weight of thickener, 3.8 parts by weight of conductive agent, parts by weight of 85 parts of solvent and 4 parts by weight of additives are used as raw materials, wherein the negative electrode active material is graphite, the binder is styrene-butadiene rubber emulsion, the thickener is sodium carboxymethyl cellulose, and the conductive agent is conductive Carbon black, the solvent is water, and the additive is N-methylpyrrolidone. Among them, the solvent is preferably deionized water.

[0046] (2) Add the thickener in step (1) into the solvent to obtain mixed liquid A. The mixed liquid A is stirred at a high speed for 2.5-4.5 hours at a temperature of 30-40°C. The mixed liquid A is heated by circulating heat ...

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Abstract

The invention relates to a preparation process for cathode paste of a lithium-ion battery. The paste for the battery electrode, which is prepared by the existing preparation process for the cathode paste of the lithium-ion battery, has problems of poor dispersion effect, instability in viscosity, settlement, powder dropping, adhesion of rollers and the like. The preparation process comprises following steps of weighing 88 to 96 parts by weight of cathode active materials, 4.8 to 6 parts by weight of bond, 1.0 to 1.7 parts by weight of thickener, 0 to 5.5 parts by weight of conductive additives, 70.4 to 115.2 parts by weight of solvent and 0.88 to 5.76 parts by weight of additives as raw materials; placing the thickener into the solvent to be blended for 2.5 to 4.5 hours; placing the conductive additives to be blended for 3 to 5 hours; gradually placing the cathode active materials into the mixture to be blended for 2.5 to 4 hours in different steps; placing the additives to be blended for 20 to 60 minutes; and placing the bond to be blended for 1.5 to 3 hours, and screening the mixture to obtain the cathode paste. The preparation process is simple to operate, the viscosity of the prepared cathode paste is stable, and the settlement can be improved.

Description

technical field [0001] The invention relates to a preparation process of lithium-ion battery negative electrode slurry, which belongs to the field of lithium-ion batteries. Background technique [0002] Since Japan's Sony Corporation first launched commercial lithium-ion batteries in 1991, lithium-ion batteries have been widely used in mobile electronic terminals due to their advantages such as light weight, high specific energy, high operating voltage, long life, and low self-discharge. Among the products, the lithium-ion battery industry has developed rapidly. [0003] Anode materials are one of the key materials of lithium-ion batteries. Carbonaceous materials are the earliest materials that people began to study and apply to anodes in lithium-ion batteries. Carbonaceous materials mainly have the following advantages: high specific capacity, low electrode potential, and high cycle efficiency. , Long cycle life. At present, the negative electrode active materials used in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/583
CPCY02E60/10
Inventor 韩改格金明钢朱强陈丽霞韩银任旭东陈刚
Owner HANGZHOU SKYRICH POWER CO LTD
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