Aqueous binder used for lithium ion batteries, positive and negative electrode plates and coating membrane

A lithium-ion battery and water-based adhesive technology, which is applied in the direction of battery electrodes, adhesive types, nitrile copolymer adhesives, etc., can solve the problem that the electrode sheet cannot be dried quickly at high temperature and affects the production efficiency of the electrode sheet coating, etc. question

Active Publication Date: 2015-11-04
SICHUAN INDIGO TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the use of LA series water-based adhesives to prepare electrode sheets cannot achieve hi

Method used

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  • Aqueous binder used for lithium ion batteries, positive and negative electrode plates and coating membrane
  • Aqueous binder used for lithium ion batteries, positive and negative electrode plates and coating membrane
  • Aqueous binder used for lithium ion batteries, positive and negative electrode plates and coating membrane

Examples

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preparation example Construction

[0052] The preparation method of the water-based adhesive for lithium-ion batteries of the present invention is as follows: adding a modifier to the acrylic soap-free copolymerization water emulsion, and mixing to obtain the water-based adhesive for lithium-ion batteries, wherein the acrylic soap-free copolymerization water The weight ratio of the solid content of the emulsion to the modifier is 100:5-50, and the acrylic soap-free copolymerization water emulsion is formed by copolymerization of two or more monomers with different polarities in the aqueous medium. The monomer refers to a hydrophilic monomer and an lipophilic monomer, and the weight ratio of the hydrophilic monomer to the lipophilic monomer is 5-60:95-40.

[0053] Preferably, the weight ratio of the solid content of the acrylic soap-free copolymerization aqueous emulsion to the modifier is preferably 100:5-20.

[0054] Further, the preparation method of the above-mentioned water-based adhesive for lithium-ion ba...

Embodiment 25

[0128] Example 25 Preparation of Coated Separator Using Aqueous Adhesive for Lithium-ion Batteries of the Present Invention

[0129] Take 20 parts of the water-based adhesive prepared in Example 3 and 400 parts of distilled water and pour it into a stirring container. After stirring and dispersing evenly, slowly add 16 parts of nano-alumina, and then quickly stir and disperse until there is no agglomerated alumina in the slurry Granules; transfer the uniform slurry prepared above to the impregnation basin for coating, and then make the 12um thick PP diaphragm successively pass through the slurry in the impregnation basin, the scraper for controlling the thickness, and dry the oven, and finally get the two sides Coated separators each with a 3um thick coating.

Embodiment 26

[0130] Example 26 Preparation of Coated Separator Using Aqueous Binder for Lithium-ion Batteries of the Present Invention

[0131]The preparation process of the coated diaphragm of this example is basically the same as that of Example 11, except that the binder obtained in Example 5 is used to prepare the coating slurry, and the binder and nano-alumina particles in the solid content of the slurry are The ratio is 3:7, and the base film is a PE diaphragm with a thickness of 25um. After coating, the coating thickness on both sides of the base film is 2um, and the total thickness of the coated separator is 29um.

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Abstract

The invention relates to an aqueous binder used for lithium ion batteries, positive and negative electrode plates and a coating membrane and belongs to the field of lithium ion battery manufacturing. The aqueous binder used for the lithium ion batteries comprises acrylic soap-free copolymerization aqueous emulsion and modifying agents, and the weight ratio of the acrylic soap-free copolymerization aqueous emulsion to the modifying agents is 100 to 5-50, wherein the modifying agents are selected from at least one of the compounds with the structural formulae being NR7R8CH2CH2CN or R9-(OCH2CH2)n-OCH2CH2CN or R10CONR11R12. The aqueous binder is suitable for modified coating of polyolefin diaphragms of the lithium ion batteries and high-temperature fast coating of the electrode plates, and the performance and the production efficiency of the lithium ion batteries can be improved.

Description

technical field [0001] The invention relates to a water-based adhesive for lithium ion batteries and a manufacturing method and application thereof, and belongs to the field of manufacturing energy storage devices such as lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, high energy density, long charge-discharge cycle life, and small self-discharge. They are widely used in electric vehicles, communication equipment, aerospace, and portable appliances. They are currently the most ideal energy storage power sources. [0003] Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators, and non-aqueous electrolytes; the positive and negative electrodes are mixed and dispersed with electroactive materials, conductive additives, and binders to make a uniform slurry, and then coated on the current collector. Aluminum foil, copper foil, and then prepared by drying, rolling ...

Claims

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Application Information

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IPC IPC(8): C09J131/04C09J133/08C09J133/20C09J133/22H01M4/62H01M2/16H01M50/446H01M50/449
CPCY02E60/10
Inventor 潘中来高建东马先果邓佳闽王璐邓正华李仁贵
Owner SICHUAN INDIGO TECH CO LTD
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