Binder and diaphragm, and preparation methods thereof

A binder and emulsifier technology, applied in the direction of adhesives, adhesive types, ester copolymer adhesives, etc., can solve the problems of poor heat resistance of the separator, increased resistance of the separator, poor adhesion and heat resistance, etc.

Active Publication Date: 2021-02-09
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polymer binder has poor adhesion and heat resistance, which makes the heat resistance of the separator poor, and excessive use of polymer binder will increase the resistance of the separator

Method used

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  • Binder and diaphragm, and preparation methods thereof
  • Binder and diaphragm, and preparation methods thereof

Examples

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preparation example Construction

[0046] A kind of preparation method of adhesive is wherein a kind of preparation method of above-mentioned adhesive, the preparation method of this adhesive comprises the following steps:

[0047] Step S210: Mix the first hard monomer, the solvent-resistant monomer, the first emulsifier and water to obtain a pre-emulsion of the core layer monomer.

[0048] Wherein, the mass of the first hard monomer accounts for 60%-95% of the total mass of the first hard monomer and the solvent-resistant monomer. Further, the first hard monomer is selected from one or a combination of two or more of methyl methacrylate, ethyl methacrylate, styrene, tert-butyl acrylate, n-butyl methacrylate, and acrylonitrile;

[0049] The mass of the solvent-resistant monomer accounts for 5% to 40% of the total mass of the first hard monomer and the solvent-resistant monomer. Further, the solvent-resistant monomer is selected from one or a combination of two or more of acrylonitrile, butyl methacrylate, and ...

Embodiment 1

[0089] The preparation steps of the diaphragm of the present embodiment are as follows:

[0090] (1) At room temperature, add 86.0g of methyl methacrylate, 10.0g of ethyl methacrylate, 40.0g of styrene, 34.0g of acrylonitrile monomer, and 10.09g of sodium dodecylsulfonate into reactor A, Add 255.0 g of deionized water to disperse and emulsify under high-speed stirring to obtain a core layer monomer pre-emulsion.

[0091] (2) At room temperature, 30.0g methyl methacrylate, 34.0g n-butyl acrylate, 10.2g acrylic acid, 6.8g dimethylaminohexyl methacrylate, 4.3g propylene methacrylate, 6.73 g of sodium dodecyl sulfonate was added dropwise with 121.5 g of deionized water under high-speed stirring for dispersion and emulsification to obtain a shell monomer pre-emulsion.

[0092] (3) At room temperature, add 209.2g of deionized water to reactor C, add half of the core layer monomer pre-emulsion in stirring tank A under high-speed stirring, adjust the pH to 6-8; add 0.10g after heating ...

Embodiment 2

[0096] The preparation steps of the diaphragm of the present embodiment are as follows:

[0097] (1) At room temperature, add 86.0g of methyl methacrylate, 10.0g of ethyl methacrylate, 40.0g of styrene, 34.0g of acrylonitrile monomer, and 10.09g of sodium dodecylsulfonate into reactor A, Add 255.0 g of deionized water to disperse and emulsify under high-speed stirring to obtain a core layer monomer pre-emulsion.

[0098] (2) At room temperature, 30.0g methyl methacrylate, 34.0g n-butyl acrylate, 10.2g acrylic acid, 6.8g dimethylaminohexyl methacrylate, 4.3g propylene methacrylate, 6.73 g of sodium dodecyl sulfonate was added dropwise with 121.5 g of deionized water under high-speed stirring for dispersion and emulsification to obtain a shell monomer pre-emulsion.

[0099] (3) At room temperature, add 209.2g of deionized water to reactor C, add half of the core layer monomer pre-emulsion in stirring tank A under high-speed stirring, adjust the pH to 6-8; add 0.10g after heatin...

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Abstract

The invention relates to a binder and a diaphragm, and preparation methods thereof, belonging to the technical field of batteries. The binder comprises a core-shell polymer, an emulsifier and water, wherein the core-shell polymer comprises a core-layer polymer and a shell-layer polymer coating the surface of the core-layer polymer; monomers in the core-layer polymer comprise a first hard monomer and a solvent-resistant monomer; and monomers in the shell-layer polymer comprise a second hard monomer, a soft monomer, a polar monomer and a crosslinking functional monomer. The binder comprises thecore-shell polymer, the emulsifier and the water, and the core-shell polymer comprises the core-layer polymer and the shell-layer polymer coating the surface of the core-layer polymer; and through themolecular structure design of the core-shell polymer, the cohesiveness and the heat resistance of the binder are improved, then the dosage of the binder in a ceramic coating is reduced, and meanwhile, the heat resistance of the diaphragm is ensured.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a binder, a diaphragm and a preparation method thereof. Background technique [0002] In recent years, the new energy industry, especially the new energy automobile industry has developed rapidly. Among them, lithium-ion batteries play an important role in the new energy industry due to their technical and product characteristics. As one of the four main materials of lithium-ion batteries, the lithium-ion battery separator plays the role of isolating the positive and negative electrodes and conducting lithium ions. It needs to have good heat resistance and low impedance. [0003] The diaphragm currently on the market uses polyolefin film as the base film and is coated with inorganic ceramic materials to form an inorganic ceramic coating. The inorganic ceramic coating is mainly composed of inorganic particles, polymer binders, and additives. However, the adhesiveness and heat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/12C08F220/14C08F220/18C08F212/10C08F220/48C08F220/06C08F220/34C08F220/40C08F220/46C08F228/02C08F230/08C08J9/36C04B26/06C04B111/94C08L23/12C08L23/06
CPCC09J133/20C09J143/04C08F220/14C08J9/365C04B26/06C08J2323/12C08J2323/06C04B2111/00534C04B2111/94C08F220/1802C08F212/10C08F220/48C08F220/1804C08F220/06C08F220/34C08F220/40C08F220/46C08F220/1812C08F228/02C08F230/085C04B24/2641C04B14/303C04B24/32C04B24/383Y02E60/10
Inventor 林峰程忠李娟娟李国龙
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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