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High-adhesion aqueous polymer coat diaphragm and preparation method and application thereof

A water-based polymer and polymer technology, applied in electrical components, electrochemical generators, circuits, etc., can solve the problems of poor adhesion of polyolefin diaphragms, influence of diaphragm consistency, and poor bonding force of adhesives, etc., to achieve adhesion High adhesion, improved overall performance, and the effect of avoiding powder falling

Active Publication Date: 2018-12-21
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-adhesion aqueous polymer coat diaphragm and preparation method and application thereof

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 heat shrinkage after baking at 105°C for 2h is 0.5% (MD directi...

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

A method for prepare a high-adhesiveness water-borne polymer coated membrane comprise uniformly mixing polymer powder, dispersant, adhesive, thickener, surfactant and deionize water to obtain polymercoated slurry, mixing that polymer powder, dispersant, adhesive, thickener, surfactant and deionized water to obtain polymer coated slurry, and mixing the polymer powder, dispersant, adhesive, thickener and deionized water. The obtained polymer coating slurry is coated on a polyolefin film and dried to obtain a coated diaphragm crude product; The obtained coated diaphragm crude product is immersedin a modified liquid, and the modified coated diaphragm is obtained by rolling the coated diaphragm in the modified liquid; The obtained modified coating diaphragm is dried to obtain a highly adhesive aqueous polymer coating diaphragm. The high-adhesion waterborne polymer coated diaphragm prepared by the invention remarkably improves the adhesion of the coated diaphragm, avoids the powder dropping phenomenon, is favorable for subsequent processes such as slitting and core winding, and simultaneously remarkably improves the comprehensive performance of the lithium ion battery diaphragm.

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 Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/417
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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