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Oily binder and application thereof

A binder and oil-based technology, applied in the field of battery materials, can solve the problems of uneven dispersion of water-based negative electrode slurry, low DC internal resistance, side reactions, and long cycle life of batteries, achieving good fast charging performance and improved energy density. , long cycle life effect

Active Publication Date: 2020-11-27
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide an oily binder and its application, the oily binder includes oily polyacrylic acid, oily polyacrylate, oily styrene acrylate, oily polyacrylonitrile, oily polyacrylamide, oily polyacrylic acid At least one of imide and oily polyamide-imide, the molecular weight of which is selected from 5W to 200W; the above-mentioned oily binder is used in the negative electrode slurry instead of the traditional water-based binder, which effectively solves the problem of water-based negative electrode slurry dispersion Unevenness, many coating particles, water-based binder floating and cold-pressed sticky rolls; and compared with traditional water-based binders, the batteries obtained from the oily binders of the present invention have low DC internal resistance, fast charging Good performance, fast charging, small temperature rise, less side reactions, and long cycle life of the battery cell; and compared with the oily polyvinylidene fluoride as a binder, the oily binder of the present invention has a higher Energy Density

Method used

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  • Oily binder and application thereof
  • Oily binder and application thereof

Examples

Experimental program
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Embodiment 1

[0045] In this embodiment, the oily binder is oily polyacrylic acid with a molecular weight of 50W; its hydrophobic functional groups include long-chain alkylamines, methylstyrene isocyanate, fluorocarbons and hydrocarbon groups;

[0046] Negative electrode slurry preparation:

[0047] The negative electrode active material is natural graphite, the conductive agent is graphene; the solvent is N-methylpyrrolidone;

[0048] Wherein, the mass ratio of negative electrode active material, oily binder, conductive agent and solvent is 47.5:1:0.5:51;

[0049] In the negative electrode slurry preparation process, the negative electrode active material, the oily binder, and the conductive agent are added into the solvent to disperse evenly to obtain the negative electrode slurry.

[0050] Negative sheet production:

[0051] Copper foil is used as a current collector, and the above-mentioned negative electrode slurry is coated on both sides of the current collector, and dried to obtain...

Embodiment 2

[0056] The difference between this example and Example 1 is that the oily binder is replaced by oily polyacrylate, and its hydrophobic groups include fluorocarbon groups; other parameters and conditions are exactly the same as in Example 1.

[0057] In this example, the oily polyacrylate contains hydrogen-fluorine bond groups, which can form effective hydrogen bonds with the surface of copper foil, and then have excellent adhesion, which is conducive to reducing the amount of binder and improving the energy of the battery cell. density.

Embodiment 3

[0059] The difference between this example and Example 1 is that the oily binder is replaced by oily polyacrylonitrile, and its hydrophobic groups include hydrocarbon groups; other parameters and conditions are exactly the same as in Example 1.

[0060] In this embodiment, the oily polyacrylonitrile contains amino groups, which can form effective hydrogen bonds with the copper foil surface, thereby having excellent adhesion, which is beneficial to reduce the amount of binder and improve the energy density of the battery cell.

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Abstract

The invention relates to an oily binder and application thereof. The oily binder comprises at least one of oily polyacrylic acid, oily polyacrylate, oily styrene acrylate, oily polyacrylonitrile, oilypolyacrylamide, oily polyimide and oily polyamideimide, and the molecular weight of the oily binder is selected from 5W-200W. The oily binder is used for replacing a traditional water-based binder tobe used for negative electrode slurry, and the problems that water-based negative electrode slurry is uneven in dispersion and large in number of coating particles, and the water-based binder floatsupwards and sticks to a roller in a cold pressing mode are effectively solved. Compared with a traditional water-based adhesive, a battery cell obtained by the oily adhesive has the characteristics oflow direct-current internal resistance, good quick-charge performance, small quick-charge temperature rise, few side reactions and long cycle life of the battery cell. Compared with oily polyvinylidene fluoride serving as a binder, the oily binder disclosed by the invention has the advantage that the obtained battery cell has higher energy density.

Description

technical field [0001] The invention belongs to the field of battery materials, and relates to an oily binder and its application. Background technique [0002] Graphite and silicon-based materials are commonly used materials for battery negative electrodes, and are widely used in the field of power batteries and consumer batteries. [0003] Graphite or silicon-based negative electrodes often use an aqueous system, in which pure water is used as a common solvent for negative electrode pulping. Water-based negative electrodes often have poor dispersion uniformity of the negative electrode slurry, and particles are prone to appear on the negative electrode sheet. The negative electrode binder styrene butadiene is easy to break when stirred, and the binder is prone to float during coating, resulting in a change in the adhesion of the electrode sheet. Poor, a series of problems such as cold-pressed pole pieces sticking to the roll. In addition, the DC internal resistance of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/583
CPCH01M4/621H01M4/622H01M4/583H01M4/625Y02E60/10
Inventor 朱忠泗李倩伟何巍刘金成顾岚冰熊后高
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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