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Lithium ion battery positive electrode slurry and preparation method thereof

A lithium-ion battery and positive electrode slurry technology, which is applied in the direction of battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of high surface tension, difficult processing, and shrinkage of slurry, so as to reduce surface tension and facilitate dispersion , the effect of improving compatibility

Active Publication Date: 2021-05-28
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in response to these two requirements, the development of battery cells is gradually developing towards high nickel and single crystal. The common feature of these two types of materials is that the specific surface area of ​​the material is large, and there will be a large surface tension problem when processed by traditional processing methods. Further coating Slurry edge shrinkage is easy to occur during cloth processing, resulting in uneven surface density. In severe cases, it will break when the thickness is uneven in post-processes such as rolling, and processing difficulties will occur.

Method used

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  • Lithium ion battery positive electrode slurry and preparation method thereof
  • Lithium ion battery positive electrode slurry and preparation method thereof
  • Lithium ion battery positive electrode slurry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]A lithium ion battery positive slurry comprising a positive electrode active substance, a binder, a conductive agent, a stabilizer, and a solvent, and the structural formula of the stabilizer is shown in the formula (1):

[0028]

[0029]In the formula (1), the A group is -Cho, the B group is -C2Hide5. The molecular weight of the stabilizer is 850,000.

[0030]Among them, the mass ratio of the positive active substance, the binder, the conductive agent, and the stabilizer is 97.5: 1: 1: 0.5, and the positive active substance is Li (Ni0.8CO0.1Mn0.1) O2The secondary ball, the binder is polyvinylidene fluoride, the conductive agent is superconducting carbon black, the solvent is NMP; the solid content of the positive electrode slurry is 75%.

[0031]The preparation method of the above lithium-ion battery positive pole slurry includes the following steps:

[0032]S1, dissolve polyvinylidene fluoride in NMP to obtain a polyvinylidene fluoride solution having an solid content of 8%, and disperse t...

Embodiment 2

[0044]A lithium ion battery positive slurry comprising a positive electrode active substance, a binder, a conductive agent, a stabilizer, and a solvent, and the structural formula of the stabilizer is shown in the formula (1):

[0045]

[0046]In the formula (1), the A group is -NH2, B group is -c6Hide5. The molecular weight of the stabilizer is 1.1 million.

[0047]Among them, the mass ratio of the positive active substance, the binder, the conductive agent, and the stabilizer is 97.8: 1: 1: 0.2, the positive electrode active material is Li (Ni0.5CO0.2Mn0.3) O2The single crystal particles, the adhesive is polyvinylidene fluoride, the conductive agent is a single-walled carbon nanotube, the solvent is NMP; the solid content of the positive electrode slurry is 65%.

[0048]The preparation method of the above lithium-ion battery positive pole slurry includes the following steps:

[0049]S1, dissolve polyfial fluoride is dissolved in NMP to obtain a polyvinylidene fluoride solution having a solid con...

Embodiment 3

[0061]A lithium ion battery positive slurry comprising a positive electrode active substance, a binder, a conductive agent, a stabilizer, and a solvent, and the structural formula of the stabilizer is shown in the formula (1):

[0062]

[0063]In the formula (1), a group is -COOH, B group is -c6Hide5. The molecular weight of the stabilizer is 1 million.

[0064]Among them, the mass ratio of the positive active substance, the binder, the conductive agent, and the stabilizer are 97.2: 1: 0.8: 1, the positive active substance is Li (Ni0.88CO0.07Mn0.05) O2The single crystal particles, the adhesive is polyvinylidene fluoride, the conductive agent is a multi-walled carbon nanotube, the solvent is NMP; the solid content of the positive electrode slurry is 78%.

[0065]The preparation method of the above lithium-ion battery positive pole slurry includes the following steps:

[0066]S1, dissolve polyfial fluoride in the solvent to obtain a polyvinylidene fluoride solution having a solid content of 10%, and...

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Abstract

The invention discloses a lithium ion battery positive electrode slurry, which comprises a positive electrode active material, a binder, a conductive agent, a stabilizer and a solvent, wherein the structural formula of the stabilizer is as shown in the formula (1) defined in the description. In the formula (1), an A group is -NH2, -COOH, -OH or -CHO, and a B group is -CH3, -C2H5, -C6H5, -C4H7 or -C5H9. The invention also discloses a preparation method of the lithium ion battery positive electrode slurry. Compared with conventional slurry, the surface tension of the lithium ion battery positive electrode slurry is greatly reduced, and the compatibility of the slurry and foil can be effectively improved.

Description

Technical field[0001]The present invention relates to the field of lithium ion batteries, in particular, to a lithium ion battery positive slurry and a preparation method thereof.Background technique[0002]With the market share of new energy electric vehicles, users' experience requirements for new energy vehicles are getting higher and higher, and the general is divided into two categories, endurance mileage and warranty cycles. These two types require the requirements of the battery. : First, the energy density iterates to a higher material; two, the quality of the warranty requires more excellent service life. At present, these two requirements have led to the development of the battery development toward the high nickel and single crystal direction, and the two types of materials have a common feature that the material specific surface area is large, and the surface tension problem in the traditional processing method will be used. When the cloth is processed, the slurry shrinkab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525H01M10/42
CPCH01M4/62H01M4/622H01M4/625H01M10/0525H01M10/4235H01M2004/028Y02E60/10
Inventor 吴小兰张宏立
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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