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Diaphragm with self-crosslinking effect and preparation method thereof

A self-crosslinking, diaphragm technology, applied in nanotechnology, structural parts, electrical components, etc. for materials and surface science, can solve the problems of poor liquid retention, weak bonding, low heat resistance of the diaphragm, etc. Strong liquid retention ability, improving high temperature shrinkage resistance and good bonding performance

Pending Publication Date: 2020-05-19
湖北江升新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a separator with self-crosslinking effect and its preparation method, aiming to solve the problems of low heat resistance, poor liquid retention and weak adhesion of lithium battery separators at the present stage

Method used

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  • Diaphragm with self-crosslinking effect and preparation method thereof
  • Diaphragm with self-crosslinking effect and preparation method thereof

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preparation example Construction

[0019] Correspondingly, an embodiment of the present invention provides a method for preparing an aqueous composition, comprising the following steps:

[0020] S01. Mix the organic solvent and water to form a first mixed solution, and adjust the first mixed solution to pH 4.0-5.0;

[0021] S02. Adding a silane coupling agent and silicon dioxide particles to the first mixed liquid, stirring and mixing, and drying to obtain modified nanometer silicon dioxide particles;

[0022] S03. Dissolving the modified silicon dioxide particles with water to obtain a modified nano silicon dioxide solution;

[0023] S04. Adding methyl methacrylate monomer and potassium persulfate to the modified nano-silica solution, and mixing them under an inert gas to obtain an aqueous composition.

[0024] Specifically, in the above step S01, the organic solvent and water are mixed uniformly to form the first mixed solution. Preferably, the organic solvent includes but not limited to solutions such as is...

Embodiment 1

[0043] Preparation method of diaphragm coating material with self-crosslinking effect:

[0044] 1) Configure the nano-silica dispersion. Mix 100 parts of isopropanol and 5 parts of water evenly to control the pH at 5, slowly add 10 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane (KH -560), stir evenly;

[0045] 2) 20 parts of nano-silica particles, D 50 The value is 300nm, added to the above mixed solution, stirred at 50° C. for 2 hours, and dried to obtain modified nano-silica particles.

[0046] 3) Add 5 parts of modified nano-silica particles to 100 parts of deionized water, add 1 part of methyl methacrylate, and mix well. The temperature was raised to 70°C under nitrogen gas, potassium persulfate was added, and the reaction was carried out at constant temperature for 3 hours.

[0047] 4) Add 10 parts of alcohol ester twelve to the above composition and stir evenly to obtain the final composition.

[0048] The above composition was coated on the surface of the biax...

Embodiment 2

[0050] Preparation method of diaphragm coating material with self-crosslinking effect:

[0051] 1) Configure the nano-silica dispersion. Mix 100 parts of isopropanol and 3 parts of water evenly and control the pH at 5, slowly add quantitatively 8 parts of KH-560 into the mixture, and stir evenly;

[0052] 2) 20 parts of nano-silica particles, D50 The value is 500nm, added to the above mixed solution, stirred at 50° C. for 2 hours, and dried to obtain modified nano-silica particles.

[0053] 3) Add 15 parts of modified nano-silica particles to 100 parts of deionized water, add 3 parts of methyl methacrylate, and mix well. The temperature was raised to 70°C under nitrogen gas, potassium persulfate was added, and the reaction was carried out at constant temperature for 3 hours.

[0054] 4) Add 12 parts of alcohol ester twelve to the above composition and stir evenly to obtain the final composition.

[0055] The above composition was coated on the surface of the biaxially orien...

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Abstract

The invention provides a diaphragm with a self-crosslinking effect and a preparation method thereof. The diaphragm comprises a substrate and a water-based composition formed on the surface of the substrate, wherein the water-based composition in the coating of the water-based composition is polymethyl methacrylate grafted nano silicon dioxide particles. A diaphragm substrate material is coated with the water-based composition with the self-crosslinking effect, a diaphragm with the self-crosslinking effect is obtained, the high-temperature shrinkage resistance of the diaphragm can be effectively improved, and the temperature resistance of the diaphragm is improved; secondly, the diaphragm has swelling and liquid retention characteristics, so that the affinity to an electrolyte can be improved; and meanwhile, the coating forms a self-crosslinking film layer, so that the bonding effect of the coating material on the diaphragm substrate can be effectively enhanced, and the coating is prevented from being separated from the diaphragm. The lithium battery diaphragm is simple in processing technology, easy in condition control and high in production efficiency, and the production cost isreduced.

Description

technical field [0001] The invention relates to the field of lithium-ion battery separators, in particular to a lithium-ion battery separator coated with a self-crosslinking composition and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, light weight, no memory effect, long cycle life and no pollution. Therefore, they have been widely researched and applied in recent years, and have become the main power source of various electronic products. Widely used in mobile phones, digital, tools, automobiles and other fields. [0003] Lithium-ion batteries are mainly composed of positive and negative electrode materials, electrolytes and separators. Among them, the separator is mainly used to separate the positive and negative poles of the battery to prevent the positive and negative poles from contacting and short-circuiting. In addition, the separator is also used to ensure the pas...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00H01M50/403H01M50/449Y02E60/10
Inventor 申向宇
Owner 湖北江升新材料有限公司
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