PMMA polymer coating diaphragm and preparation method thereof

A technology of polymer coating and diaphragm, which is applied in the field of PMMA polymer coating diaphragm and its preparation, can solve the problems of poor solubility of PMMA powder, uneven coating, uneven coating of PMMA polymer, etc., and achieve the improvement of anti-oxidation Sexuality and long-term cycle performance, improve the dispersion effect, solve the effect of uneven coating

Pending Publication Date: 2020-06-30
安徽金力新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of poor solubility of PMMA powder in the water system and partial uneven coating, and provide a PMMA polymer coating diaphragm and its preparation method
Adopting the technical scheme of the present invention can not only improve the solubility of PMMA in the water system, enable the PMMA powder to be effectively dispersed in the water system, but also enhance the bonding strength between the diaphragm and the pole piece, and better solve the problem of PMMA polymer partial coating Inhomogeneous problems, but also effectively inhibit battery swelling and deformation, improve the hardness and consistency of the battery, improve its oxidation resistance and long-term cycle performance

Method used

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preparation example Construction

[0040] A kind of preparation method of the above-mentioned PMMA polymer coating separator of the present invention, comprises the following steps:

[0041] Step 1, prepare PMMA coating slurry

[0042] Weigh 15-25 parts of PMMA powder in a container, add 1-5 parts of dispersing aid to it for pre-mixing; add 40-60 parts of deionized water to the pre-mixed powder, at a speed of Stir at 700-1000r / min and disperse for 10-20min. The dispersion process reduces the distance between polar and non-polar substances, increases the potential energy and surface energy, and may cause a decrease in temperature, which is a normal phenomenon; and then Add 3-7 parts of the first binder and 0.02-0.1 parts of the second binder, and disperse for 15-30 minutes under stirring at a speed of 700-1000r / min; then add 3-8 parts of thickener Disperse again for 10-20min under stirring at a rotating speed of 700-1000r / min, and finally add 0.1-0.4 parts of surfactant, and disperse for 10-20min under stirring...

Embodiment 1

[0047] A kind of preparation method of PMMA polymer coating separator of the present embodiment, comprises the following steps:

[0048] Weigh 20 parts of PMMA powder in a container, add 2 parts of dispersing aid to it for pre-mixing; add 40 parts of deionized water to the pre-mixed powder, and stir at a speed of 900r / min Disperse for 10 minutes; then add 3 parts of the first binder and 0.06 parts of the second binder, and disperse for 20 minutes under stirring at a speed of 900r / min; then add 5 parts of thickener again at a speed of 900r / min Disperse for 10min under stirring at a speed of 900r / min, and finally add 0.15 parts of surfactant, and disperse for 10min under stirring at a rotational speed of 900r / min to obtain a uniformly mixed water-based coating slurry.

[0049] The PMMA coating slurry is coated on one side of the base film by gravure coating. The base film for coating is a 12-micron separator, and the thickness of the coating is controlled to be 2 μm by gravure c...

Embodiment 2

[0051] A kind of preparation method of PMMA polymer coating separator of the present embodiment, comprises the following steps:

[0052] Weigh 15 parts of PMMA powder in a container, add 2 parts of dispersing aid to it for pre-mixing; add 45 parts of deionized water to the pre-mixed powder, and stir at a speed of 900r / min Disperse for 10 minutes; then add 3 parts of the first binder and 0.06 parts of the second binder, and disperse for 20 minutes under stirring at a speed of 900r / min; then add 5 parts of thickener again at a speed of 900r / min Disperse for 10min under stirring at 900r / min, and finally add 0.2 parts of surfactant, and disperse for 10min under stirring at a rotating speed of 900r / min to obtain a uniformly mixed water-based coating slurry.

[0053] The gravure coating method is used to coat the PMMA coating slurry on one side of the base film. The gravure coating controls the coating thickness to 2 μm to ensure that the coated particles form a uniform coating on t...

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Abstract

The invention discloses a PMMA polymer coating diaphragm and a preparation method thereof, and belongs to the field of battery diaphragms. The PMMA polymer coating diaphragm comprises a base membraneand a PMMA polymer coating coated on at least one surface of the base membrane; the PMMA polymer coating contains PMMA powder, a dispersing aid, a first binder and a second binder. The preparation method comprises the following steps: preparing PMMA coating slurry, and enabling the surface of a base film to coated with the PMMA coating slurry; the solubility of the PMMA in a water system can be improved, the PMMA powder can be effectively dispersed in a water system, the bonding strength of the diaphragm and the pole piece is enhanced, the problem of non-uniform coating of a PMMA polymer partis better solved, meanwhile, the phenomena of swelling and deformation of the battery are effectively inhibited, the hardness and consistency of the battery are improved, and the oxidation resistanceand long-term cycle performance of the battery are improved.

Description

technical field [0001] The invention belongs to the field of battery diaphragms, and more specifically relates to a PMMA polymer coating diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion battery (LIB) is currently the battery system with the best comprehensive performance. It has the characteristics of high specific energy, high cycle life, small size, light weight, no memory effect, and no pollution. It has rapidly developed into a new generation of energy storage power supply. It can be used for power support in information technology, electric and hybrid vehicles, aerospace and other fields. As one of the key inner components of lithium-ion batteries, the separator should have ionic conductivity and electronic insulation, good electrolyte wettability and sufficient liquid absorption and moisture retention, and require better dimensional stability and flatness. sex. [0003] At present, as the specific energy of batteries continues to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525C09D133/12C09D7/63C09D7/65
CPCH01M10/0525C09D133/12C09D7/63C09D7/65C08L2205/035H01M50/403H01M50/411C08L71/02C08L33/02C08L9/08C08L33/26C08L29/04C08L75/14C08L33/04C08L83/06C08L1/286C08L1/284C08L5/04C08L1/28C08K5/05Y02E60/10
Inventor 张杰邓豪庞冲王娟
Owner 安徽金力新能源有限公司
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