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Method for preparing positive electrode slurry of lithium ion battery

A lithium-ion battery and positive electrode slurry technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems that restrict the development of lithium manganate batteries, high capacity decay rate, and poor cycle performance of lithium manganate materials. Reduced attenuation rate, improved cycle performance, and long cycle life

Inactive Publication Date: 2013-05-08
ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, lithium manganese oxide has the advantages of rich resources, high voltage, and low cost, and will have broad market prospects in the fields of energy, transportation, environmental protection, communications, and oceans. However, due to the poor cycle performance and capacity decay rate of lithium manganate materials High, restricting the development of lithium manganese oxide batteries in the industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] (1) Homogenize the positive electrode, mix and stir N-methylpyrrolidone and 3% polyvinylidene fluoride for 120 minutes, add 4% conductive agent and stir for 120 minutes, add 93% of the positive electrode material in two times at 1:1, and add N-methylpyrrolidone, stirred for 270min. The positive electrode material is a mixture of lithium manganate and ternary materials, the mass ratio is 2:3, and the total amount of N-methylpyrrolidone is 40-50% of the total amount of the slurry. The ambient humidity during the operation is not more than 45%, the stirring speed is 1800-2200r / min, the vacuum degree is not higher than -0.09MPa; the temperature of the slurry is controlled at 20~45°C, if necessary (when the temperature of the slurry is higher) Wipe the homogenizer with alcohol or add cooling water or reduce the speed. The output viscosity is 6500-8500MPa·s, and the solid content is 50-60%. After the stirring, the slurry was filtered through a 150-mesh filter to obtain posi...

Embodiment 2

[0022] (1) Homogenize the positive electrode, mix and stir N-methylpyrrolidone and 3% polyvinylidene fluoride for 120 minutes, add 4% conductive agent and stir for 120 minutes, add 93% of the positive electrode material in two times at 1:1, and add N-methylpyrrolidone, stirred for 270min. The positive electrode material is a mixture of lithium manganate and ternary materials with a mass ratio of 1:1, and the total amount of N-methylpyrrolidone is 40-50% of the total amount of the slurry. The ambient humidity during the operation is not more than 45%, the stirring speed is 1800-2200r / min, the vacuum degree is not higher than -0.09MPa; the temperature of the slurry is controlled at 20~45°C, if necessary (when the temperature of the slurry is higher) Wipe the homogenizer with alcohol or add cooling water or reduce the speed. The output viscosity is 6500-8500MPa·s, and the solid content is 50-60%. After the stirring, the slurry was filtered through a 150-mesh filter to obtain po...

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Abstract

The invention discloses a method for preparing anode slurry of a lithium ion battery. The method comprises the following steps of: mixing and stirring 50 parts of N-methyl pyrrolidone and 3 parts of polyvinylidene fluoride for 120 minutes, adding 4 parts of conductive agent and stirring for 120 minutes, adding 93 parts of positive electrode materials, adding 50 parts of N-methyl pyrrolidone, stirring for 270 minutes, and filtering the slurry which is completely stirred through a 150-mesh filtering net. By adoption of the technical scheme, the method has the advantages that 1. the positive electrode material is a mixed material of lithium manganate and nickel cobalt lithium manganate; 2. the N-methyl pyrrolidone and 3 percent of polyvinylidene fluoride are mixed to prepare colloid; and 3. 4 percent of conductive agent is added for stirring, 93 percent of positive electrode material is added twice and uniformly mixing. The proportioning formula of the positive electrode material is adjusted, and the homogenizing process is improved, so that the slurry is fully dispersed, and compared with the conventional lithium manganate battery, the prepared lithium manganate battery has the obvious advantages that the capacity attenuation rate is reduced, the cycle lift is prolonged, and the cycle performance of the battery is improved.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode slurry of a lithium ion battery. Background technique [0002] At present, lithium manganese oxide has the advantages of rich resources, high voltage, and low cost, and will have broad market prospects in the fields of energy, transportation, environmental protection, communications, and oceans. However, due to the poor cycle performance and capacity decay rate of lithium manganate materials High, restricting the development of lithium manganese oxide batteries in the industry. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for preparing a positive electrode slurry of a lithium ion battery in which the positive electrode material is ternary lithium manganate doped, which is suitable for industrial production and has a long cycle life. [0004] In order to solve the above-mentioned technical problems, the presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 周明明杨佳星宋泽斌杨晓旭赵峰时培虎
Owner ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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