High-adhesive water-based polymer-coated separator and its preparation method and application

A water-based polymer and polymer technology, applied in the direction of separators/films/diaphragms/spacers, structural parts, electrical components, etc., can solve the problem of poor adhesion of polyolefin diaphragms, poor bonding force of adhesives, and consistent diaphragms In order to achieve the effects of low concentration of organic solvent, high adhesion and improved comprehensive performance

Active Publication Date: 2021-06-22
湖南烁普新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since most of the current polymer coating materials are hydrophobic materials, the surface energy is low, and the binding force with the binder is poor, resulting in poor adhesion of the composite diaphragm coating prepared by the traditional water-based coating process to the polyolefin diaphragm. It is easy to produce powder drop, which affects the normal process of subsequent slitting and cell winding, and also affects the consistency of the separator.

Method used

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  • High-adhesive water-based polymer-coated separator and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 10g of polyvinylidene fluoride powder with a particle size of 0.5μm, 2.5g of maleic anhydride-vinyl acetate, 15g of styrene-butadiene latex, 1g of hydroxyethyl cellulose, 0.001g of fluoroalkyl ethoxy ether alcohol and 71.499g of The ionized water is mixed and stirred to obtain a polymer coating slurry. The polymer coating slurry was coated on the polyolefin film and dried at 100° C. to obtain a dried coated separator. Soak the dried coated diaphragm in the modifying solution for 10 minutes, and finally apply a pressure of 400 MPa to the coated diaphragm in the modifying solution by rolling to obtain a modified coated diaphragm. The modified coated diaphragm was dried at 40° C. to obtain a highly cohesive water-based polymer coated diaphragm.

[0041] The peel strength of the highly adhesive water-based polymer coated separator prepared in this example is 333.3N / m, the decomposition voltage is 4.8V, and the thermal shrinkage after baking at 105°C for 2h is 0.5% (MD dire...

Embodiment 2

[0043]15g of carboxymethylcellulose powder with a particle size of 1.5μm, 15g of polyacrylonitrile powder with a particle size of 0.5μm, 2g of styrene-maleic anhydride, 3g of potassium polyacrylate, 7.5g of polyurethane, 0.001g of methyl hydroxyethyl Base cellulose, 3g fatty alcohol polyoxyethylene ether, 2g fatty acid polyoxyethylene ether and 55.799g deionized water were mixed and stirred to obtain a polymer coating slurry. The polymer coating slurry was coated on the polyolefin film and dried at 60° C. to obtain a dried coated separator. Soak the dried coated diaphragm in the modifying solution for 5 minutes, and finally apply a pressure of 200 MPa to the coated diaphragm in the modifying solution by rolling to obtain a modified coated diaphragm. The modified coated membrane was dried under the condition of 100° C. to obtain a highly cohesive water-based polymer coated membrane.

[0044] The peel strength of the highly adhesive water-based polymer coated separator prepared...

Embodiment 3

[0046] 15g of aramid fiber powder with a particle size of 3μm, 0.05g of polyethylene glycol, 2.5g of styrene-acrylic latex, 2.5g of polyvinyl alcohol, 1g of sodium carboxymethyl cellulose, 4g of polyacrylamide, and 1.7g of alkylphenol polyoxygen Vinyl ether and 73.299 g of deionized water were mixed and stirred to obtain a polymer coating slurry. The polymer coating slurry was coated on the polyolefin film and dried at 40° C. to obtain a dried coated separator. Soak the dried coated diaphragm in the modifying solution for 1 second, and finally apply a pressure of 10 MPa to the coated diaphragm in the modifying solution by rolling to obtain a modified coated diaphragm. The modified coated separator was dried at 65° C. to obtain a highly cohesive water-based polymer coated separator.

[0047] The peel strength of the highly adhesive water-based polymer coated separator prepared in this example is 367.4N / m, the decomposition voltage is 4.8V, and the heat shrinkage after baking a...

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Abstract

The invention provides a high-adhesive water-based polymer coated diaphragm and its preparation method and application. The preparation method steps are: polymer powder, dispersant, adhesive, thickener, surfactant and deionized Mix with water evenly to obtain a polymer coating slurry; coat the obtained polymer coating slurry on a polyolefin film, and dry to obtain a crude coated separator; soak the crude coated separator in the modifying solution , and rolling in the modifying solution to obtain a modified coating diaphragm; drying the obtained modified coating diaphragm to obtain a high-adhesive water-based polymer coating diaphragm. The high-adhesive water-based polymer coated separator prepared by the present invention significantly improves the adhesiveness of the coated separator, avoids the phenomenon of powder dropping, is beneficial to subsequent processes such as slitting and cell winding, and significantly improves the performance of the lithium-ion battery separator. Comprehensive performance.

Description

technical field [0001] The invention relates to the technical field of battery separator materials, in particular to a high-adhesive water-based polymer-coated separator and its preparation method and application. Background technique [0002] In 1990, lithium-ion batteries were first successfully developed by Japan's SONY company, and gradually realized commercialization. Lithium-ion batteries use lithium-intercalated compounds as the negative electrode, high voltage, excellent cycle performance and safety, and have outstanding advantages such as fast charge and discharge, no memory effect and no pollution, making them ideal for cameras, mobile phones, notebook computers, portable measurement devices, etc. It is an ideal power source for small and lightweight electronic devices such as instruments, and it is also an ideal light and high-energy power source for future electric vehicles. Therefore, research on lithium-ion batteries has been widely concerned. [0003] The di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/40H01M50/403H01M50/417H01M50/414H01M50/449H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 罗建吴秀锋钟海燕张杨肖欢张鹏孙先维雷建清蔡滔
Owner 湖南烁普新材料有限公司
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