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A lithium ion battery negative electrode slurry, negative electrode material, lithium ion battery and preparation method thereof

A lithium-ion battery, negative electrode slurry technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor slurry performance and lithium-ion battery performance degradation, and achieve the effect of small capacity loss

Active Publication Date: 2020-08-14
深圳齐锂纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of performance degradation of the lithium ion battery after cyclic discharge caused by the poor performance of the slurry used on the negative electrode material of the lithium ion battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] ionic liquid modified Preparation of waterborne acrylic polyurethane emulsion:

[0044] Step 1: Add polyol (polyoxyethylene diol) 15g, polyisocyanate monomer (isophorone diisocyanate) 40g, hydrophilic chain extender (dimethylolpropionic acid) 5g and Catalyst (dibutyltin dilaurate) 1g, react at 65°C for 3 hours to obtain a prepolymer;

[0045] Step 2: Lower the temperature in the reaction vessel to 60°C, then add 6g of 1-allyl-3-methylimidazole chloride and 20g of acrylic monomer (acrylonitrile), lower the temperature to 40°C, and add Neutralizer (triethylamine) 3g, react for 20 minutes, add 240g deionized water and stir at room temperature to obtain polyurethane emulsion;

[0046] Step 3: Add 3g of initiator (2,2'-azobis-2-methylbutyronitrile), 2g of emulsifier (lecithin) and 15g of acrylic monomer (methacrylamide) into the reaction vessel, React at 80° C. for 4 hours to obtain an ionic liquid-modified waterborne acrylic polyurethane emulsion.

[0047] Preparation o...

Embodiment 2

[0050] The difference from Example 1 is that in the third step of the preparation of the aqueous acrylic polyurethane emulsion, monomer ethyl vinyl ether is also added.

[0051] ionic liquid modified Preparation of waterborne acrylic polyurethane emulsion:

[0052] Step 1: Add 20g of polyol (polyoxyethylene diol), 35g of polyisocyanate monomer (isophorone diisocyanate), 8g of hydrophilic chain extender (dimethylol propionic acid) and Catalyst (dibutyltin dilaurate) 2g, react at 75°C for 5 hours to obtain a prepolymer;

[0053] Step 2: Lower the temperature in the reaction vessel to 60°C, then add 4g of 1-allyl-3-methylimidazole chloride and 15g of acrylic monomer (acrylonitrile), lower the temperature to 40°C, and add Neutralizing agent (triethylamine) 2g, react for 25 minutes, add 250g deionized water and stir at room temperature to obtain polyurethane emulsion;

[0054] Step 3: Add 5g of initiator (2,2'-azobis-2-methylbutyronitrile), 1g of emulsifier (lecithin) and 20g of...

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PUM

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Abstract

The invention relates to negative electrode slurry and a negative electrode material of a lithium ion battery, the lithium ion battery and a preparation method thereof, and belongs to the technical field of the lithium ion battery. The negative electrode slurry of the lithium ion battery is prepared from the following components in parts by weight: 65 to 75 parts of lithium titanium composite oxide, 16 to 20 parts of ionic liquid modified water-based acrylic polyurethane resin emulsion, 2 to 5 parts of a conductive agent, 0.5 to 1 part of film-forming aid, 0.5 to 1 part of surfactant and 150 to 175 parts of solvent. After the water-based acrylic polyurethane resin emulsion used in the slurry is subjected to ionic liquid modification, the emulsion has a positive charge group, the emulsion and the lithium titanium composite oxide can form higher dispersibility and fusion property, and the slurry has higher electrochemical property after being made into the electrode.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode slurry, a negative electrode material, a lithium ion battery and a preparation method thereof, belonging to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion battery refers to a secondary battery composed of two lithium-ion compounds that can reversibly intercalate and deintercalate as positive and negative electrodes. When the battery is charged, lithium ions are extracted from the positive electrode of the battery, and the generated lithium ions move to the negative electrode through the electrolyte. When the battery is discharged (that is, the process of using the battery), the lithium ions embedded in the carbon layer of the negative electrode come out and return to the positive electrode. During the charging and discharging process of the battery, lithium ions are in a state of motion from positive electrode → negative electrode → positive elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/364H01M4/485H01M4/628H01M10/0525Y02E60/10
Inventor 徐丽丽
Owner 深圳齐锂纳米科技有限公司