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Polyethylene micropore diaphragm containing organic/inorganic composite cross-linking coating and preparation method of polyethylene micropore diaphragm

A polypropylene microporous membrane and inorganic composite technology, which is applied in the direction of separators/films/diaphragms/spacers, electrical components, circuits, etc., can solve the problem of insufficient binding force, affecting battery performance, coating and diaphragm binding force Poor and other problems, to achieve the effect of increasing the temperature of thermal shrinkage film rupture, improving the safety performance of use, and high closed cell temperature

Active Publication Date: 2015-06-10
扬州市永佳车辆配件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned patents use coating technology to improve the heat resistance of polyolefin battery separator materials, but also bring other problems: (1) The bonding force between the coating and the separator is poor, which is easy to cause peeling off during battery processing, Affect the service life of the battery; (2) It is difficult for the inorganic powder to form a uniform dispersion in the organic polymer coating, and the binding force between the inorganic particles and the organic polymer is not high enough, which reduces the strength and thermal stability of the composite coating (3) The formed surface coating is easy to block the original micropores of the microporous membrane, reduce the original porosity and air permeability of the microporous membrane, hinder ion conduction, and affect battery performance

Method used

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  • Polyethylene micropore diaphragm containing organic/inorganic composite cross-linking coating and preparation method of polyethylene micropore diaphragm
  • Polyethylene micropore diaphragm containing organic/inorganic composite cross-linking coating and preparation method of polyethylene micropore diaphragm
  • Polyethylene micropore diaphragm containing organic/inorganic composite cross-linking coating and preparation method of polyethylene micropore diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The polypropylene microporous membrane prepared by the uniaxial stretching process is used as the coating base membrane, with a thickness of 21.3 μm, a porosity of 46.2%, and a Gurley value reflecting the air permeability of 157s. The two surfaces of this polypropylene microporous membrane are subjected to the same degree of normal temperature and low pressure plasma treatment, and air is used as the treatment atmosphere, and the base membrane is treated for 30 seconds at room temperature (25 ° C), 45W power and 60Pa vacuum condition, and the plasma The water contact angle of the basement film surface decreased from 103° to 25° after bulk treatment, and the treated basement film was used for the coating process within 15 minutes.

[0039] The aromatic isocyanate is a mixture of naphthalene diisocyanate (NDI) and trimeric isocyanate (the molar ratio is 50:50), with a molecular weight of 1000, an average functionality of 3, a hydroxyl value of 166mgKOH / g, and p-phenylene i...

Embodiment 2

[0045] The polypropylene microporous membrane in Example 1 was used as the coating base membrane. The mixing molar ratio of naphthalene diisocyanate and trimeric isocyanate in the example 1 coating solution is changed to 30:70, 40:60, 60:40 and 70:30 respectively from 50:50, other components in the coating solution and The dosage was still the same as in Example 1, and four coating solutions were prepared respectively. Then according to the coating process and curing process in Example 1, four kinds of polypropylene microporous membranes with different cross-linked composite coating structures were prepared respectively. The results of the tests on these four microporous membranes are listed in Table 2.

[0046] Table 2 Performance of crosslinked composite coating PP microporous membrane in Example 2

[0047]

[0048] From the test results in Table 2 and Table 1, it can be seen that changing the mixing molar ratio of naphthalene diisocyanate and isocyanurate in aromatic i...

Embodiment 3

[0050] The polypropylene microporous membrane in Example 1 was used as the coating base membrane. In the coating solution of Example 1, the molecular weight is 1000, the average functionality is 3, the aromatic polyester with a hydroxyl value of 166mgKOH / g, and the molar ratio of terephthalic acid and phthalic anhydride in the molecular chain is 65:35, respectively Replace it with aromatic polyester polyols with molecular weights of 500, 1500, and 2000. Their hydroxyl values ​​are 332, 112, and 84 mgKOH / g, respectively, and the molar ratio of terephthalic acid to phthalic anhydride in the molecular chain is 65. :35. The other components and dosages in the coating solution were still the same as in Example 1, and three coating solutions were prepared respectively. Then according to the coating process and curing process in Example 1, three kinds of polypropylene microporous membranes with different cross-linked composite coating structures were prepared respectively. The resu...

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Abstract

The invention belongs to the field of functional polymer membrane preparation, and in particular relates to a polyethylene micropore diaphragm which is used for improving the use security of a lithium ion battery and contains an organic / inorganic composite cross-linking coating, and a preparation method of the polyethylene micropore diaphragm. The preparation method comprises the following steps: by taking aromatic polyester polyhydric alcohol and aromatic isocyanate as basic components, preparing a coating liquid by combing with a cross-linking agent, a foaming agent, a catalyst and inorganic nano packing at a certain ratio, coating at least one surface of the polyethylene micropore diaphragm with the coating liquid, and curing at certain temperature, thereby forming an organic polymer / inorganic nanoparticle composite cross-linking coating of a pored foamed structure on the surface of the polyethylene micropore diaphragm. Relatively high porosity and air permeability of the polyethylene micropore diaphragm are maintained, at the same time the thermal shrinkage membrane breaking temperature is greatly improved, and the use security property of the battery can be remarkably improved when the polyethylene micropore diaphragm is used as a power lithium ion battery diaphragm material.

Description

technical field [0001] The invention belongs to the field of preparation of functional polymer films, and in particular relates to a polypropylene microporous film containing an organic / inorganic composite cross-linked coating for improving the safety of lithium-ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of long cycle life, high specific energy, and no memory effect. They are widely used in rechargeable batteries for portable electronic products such as mobile phones, notebook computers, and camcorders, as well as power sources for environmentally friendly electric vehicles. The microporous diaphragm is an important part of the lithium-ion battery. Its function is to prevent the physical contact between the positive and negative materials, and allow the ion flow to pass through the micropores of the diaphragm, so as to ensure that the lithium ions are in the positive and negative state during th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/411H01M50/446H01M50/449H01M50/491
CPCH01M50/40H01M50/409Y02E60/10
Inventor 俞强程向君蒋姗丁永红张洪文王克敏刘晶如朱梦冰
Owner 扬州市永佳车辆配件有限公司
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