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High-cohesiveness battery diaphragm and preparation method thereof and lithium ion battery

A battery diaphragm and high-adhesion technology, which is applied to secondary batteries, battery pack components, circuits, etc., can solve the problems of high manufacturing cost and environmental pollution, reduce the internal resistance of the battery, improve cycle performance, and excellent The effect of thermal stability

Pending Publication Date: 2020-05-22
微宏先进膜公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the manufacturing cost is high and pollutes the environment

Method used

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  • High-cohesiveness battery diaphragm and preparation method thereof and lithium ion battery
  • High-cohesiveness battery diaphragm and preparation method thereof and lithium ion battery
  • High-cohesiveness battery diaphragm and preparation method thereof and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0043] This embodiment provides a method for preparing a high-adhesive battery separator, which includes a base film and two layers of coating, comprising the following steps:

[0044] (1) Add 5 kg of alumina, 0.05 kg of polyacrylic acid and 0.1 kg of sodium carboxymethyl cellulose into 18.18 kg of water, stir for 1 h with a double planetary mixer, add 1.667 kg of PVDF aqueous emulsion with a solid content of 30%, and continue stirring for 0.5 h, Sand mill for 0.5h to make coating slurry;

[0045] (2) Using polyimide diaphragm as the base film, the coating slurry is coated on both sides of the polyimide diaphragm by micro-gravure roller type double-sided coating, the coating speed is 60m / min, and after coating, it is coated at 90 ℃ dry;

[0046] (3) Treat the coated polyimide separator at 250° C. for 10 minutes to obtain a final high-adhesive battery separator.

[0047] The thickness of the high adhesive battery separator is 15.7 microns. like figure 1 As shown, it is a scan...

Embodiment 2

[0049] This embodiment provides a method for preparing a high-adhesive battery separator, which includes a base film and two layers of coating, comprising the following steps:

[0050] (1) Add 5 kg of alumina, 0.05 kg of polyacrylic acid and 0.1 kg of sodium carboxymethyl cellulose into 19.52 kg of water, stir for 1 h with a double planetary mixer, add 0.33 kg of PVDF aqueous emulsion with a solid content of 30%, and continue stirring for 0.5 h, Sand the above slurry for 0.5h to prepare coating slurry;

[0051] (2) Using the polyimide diaphragm as the base film, the coating slurry is coated on both sides of the polyimide diaphragm by slit-type double-sided coating, the coating speed is 30m / min, and the coating is finished at 60°C dry;

[0052] (3) Treat the coated polyimide separator at 300° C. for 2 minutes to obtain a final high-adhesive battery separator.

[0053] The thickness of the high adhesive battery separator is 15.9 microns.

Embodiment 3

[0055] This embodiment provides a method for preparing a high-adhesive battery separator, which includes a base film and two layers of coating, comprising the following steps:

[0056] (1) Add 5kg of boehmite, 0.05kg of polyacrylic acid and 0.1kg of sodium carboxymethyl cellulose into 11.52kg of water, stir with a double planetary mixer for 1 hour, add 8.33kg of PVDF aqueous emulsion with a solid content of 30%, and continue stirring for 0.5 hours , sanding the above slurry for 0.5h to obtain a coating slurry;

[0057] (2) Using the aramid separator as the base film, the coating slurry is double-coated on both sides of the aramid separator with a wire rod, the coating speed is 50m / min, and dried at 70°C after coating;

[0058] (3) Treat the coated aramid separator at 230° C. for 15 minutes to obtain a final high-adhesive battery separator.

[0059] The thickness of the high adhesive battery separator is 16.1 microns.

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Abstract

The invention provides a preparation method of a high-cohesiveness battery diaphragm. The battery diaphragm comprises a base membrane and at least one coating, and the preparation method comprises thefollowing steps: (1) mixing polymer nanoparticles and a solvent to prepare coating slurry; (2) coating at least one surface of the base film with the coating slurry to form a coating; (3) carrying out high-temperature treatment on the base membrane coated with the coating to obtain the battery diaphragm, wherein the temperature of the high-temperature treatment is 180-300 DEG C, wherein the polymer nanoparticles are melted and recrystallized in the high-temperature treatment process. The diaphragm adopts a high-temperature-resistant material as a base membrane, has the advantages of high temperature resistance, low cost and no pollution, and after the diaphragm is infiltrated in an electrolyte, PVDF in a coating and a pole piece are high in binding power and good in fitting degree, and the internal resistance of a battery is low.

Description

technical field [0001] The invention mainly relates to a method for preparing a battery separator, in particular to a method for preparing a high-adhesion battery separator, a battery separator prepared by the method, and a lithium ion battery containing the battery separator. Background technique [0002] The electrification and intelligence of transportation has gradually become the trend of the future development of automobiles. In order to meet the continuous development needs, the power battery, which is the core component of automobile electrification, has become a key component. High energy density, high safety, and long life are the three core elements of a power battery. As an important part of a power battery, the separator is self-evident, and high temperature resistance, low internal resistance and electrochemical stability are the characteristics of the separator. basic requirements. [0003] In order to increase the high temperature resistance performance of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 何金波罗建海文娟·刘·麦蒂斯
Owner 微宏先进膜公司