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

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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Example Embodiment

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

[0020] S01. Mix the organic solvent and water into the first mixed solution, and adjust the pH of the first mixed solution to 4.0~5.0;

[0021] S02. Add a silane coupling agent and silica particles to the first mixed solution, stir and mix, and dry to obtain modified nano silica particles;

[0022] S03. The modified silica particles are dissolved in water to obtain a modified nano silica solution;

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

[0024] Specifically, in the above step S01, the organic solvent and water are uniformly mixed to form the first mixed solution. Preferably, the organic solvent includes but is not limited to solutions such as isopropanol and toluene. In a preferred embodiment of th...

Example Embodiment

[0042] Example 1

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

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

[0045] 2) Put 20 parts of nano silica particles, D 50 The value is 300nm, added to the above mixed solution, stirred at 50°C for 2h, 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 flow, potassium persulfate was added, and the reaction was kept constant 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 biaxially stretched poly...

Example Embodiment

[0049] Example 2

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

[0051] 1) Prepare nano silica dispersion liquid. Mix 100 parts of isopropanol and 3 parts of water to uniformly control the pH at 5, slowly add quantitative 8 parts of KH-560 to the mixed solution, and stir evenly;

[0052] 2) Put 20 parts of nano silica particles, D 50 The value is 500nm, added to the above mixed solution, stirred at 50°C for 2h, 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 flow, potassium persulfate was added, and the reaction temperature was constant 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 stretche...

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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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