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Preparation method of lithium-ion secondary battery diaphragm with a crosslinking composite layer

A cross-linked structure and secondary battery technology, which is applied to structural parts, battery pack parts, circuits, etc., can solve the problems of reducing the strength of the diaphragm, peeling off the coating layer, and poor bonding force, so as to improve the charging and discharging efficiency and reduce the The effect of battery internal resistance and heat shrinkage reduction

Active Publication Date: 2013-01-23
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

Although the patent introduces a cross-linked structural polymer, which has higher thermal dimensional stability than linear polymers, since the ceramic particles and functional inorganic components are physically bonded to the cross-linked polymer, the cross-linked coating There is no chemical bond connection with the diaphragm, the binding force is still poor, it is easy to cause falling off, reduce the strength of the diaphragm, and ultimately affect the safety of the diaphragm
In the process of battery processing, creases and breakages in the diaphragm can easily cause the coating layer to fall off, and the coating process is relatively complicated, and it is not easy to form a uniform coating layer, which also has an adverse effect on the performance of the battery.

Method used

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  • Preparation method of lithium-ion secondary battery diaphragm with a crosslinking composite layer
  • Preparation method of lithium-ion secondary battery diaphragm with a crosslinking composite layer

Examples

Experimental program
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Embodiment 1

[0023] First, the polypropylene microporous base membrane was placed in 20% ammonium persulfate strong oxidizing agent solution, stirred at 80°C for 30 min, the microporous membrane was taken out, and rinsed three times with deionized water. Make mixed solvent with 30mL toluene / nonane, take by weighing 0.8g vinyltriethoxysilane, 0.1g acrylamide, 0.4g benzoyl peroxide, namely vinyltriethoxysilane: acrylamide: the ratio of initiator The molar ratio is 10:3:4, and it is prepared as a grafting solution. Put the membrane pretreated by the strong oxidant into the grafting solution, and react for 3 hours under the protection of nitrogen at the reaction temperature of 80°C. The mixed solution was obtained at the ratio of absolute ethanol:water=9:1, and the pH of the mixed solution was adjusted to 4-5 with acetic acid. Weigh 0.01g of nano-TiO with a particle size range of 20-80nm 2 Inorganic particles are placed in the mixed solution, dispersed evenly by ultrasonic vibration, the gra...

Embodiment 2

[0029] First, put the polyethylene microporous base film into 10% potassium dichromate strong oxidant solution, stir at 30°C for 30 min, take out the microporous film, and rinse it several times with deionized water. Using 25ml of xylene / decane as a solvent, weigh 1.0g of vinyltri-tert-butylsilane, 0.2g of acrylic acid, and 0.4g of dicumyl peroxide to prepare a grafting solution. Put the pretreated membrane into the grafting solution, under the condition of 70℃, N 2 After 4 hours of protection reaction, it was taken out. The mixed solution was obtained at the ratio of absolute ethanol:water=9:1, and the pH of the mixed solution was adjusted to 4-5 with hydrochloric acid. In addition, 0.03 g of ZnO inorganic particles with a particle size ranging from 20 to 100 nm were weighed, placed in the mixed solution together with the grafted diaphragm, and stirred for 2 hours for hydrolysis. After the membrane was washed with heptane, it was dried in a vacuum oven at 40° C. to obtain a...

Embodiment 3

[0031] First, put the polypropylene microporous base membrane in 15% potassium persulfate strong oxidant solution, stir at 70°C for 30 min, take out the microporous membrane, and rinse it with deionized water three times. With 30ml tetrahydrofuran / N,N-dimethylformamide as solvent, weigh 1.2g of vinyl tris(β-ethoxymethoxy)silane, 0.1g of acrylamide, 0.25g of di-tert-butyl peroxide Base, prepared as a grafting solution. Put the pretreated membrane into the grafting solution, under the condition of 120°C, N 2 Take out after protection reaction 5h. The mixed solution was obtained at the ratio of absolute ethanol:water=9:1, and the pH of the mixed solution was adjusted to 4-5 with dilute sulfuric acid. In addition, weigh 0.01g of SiO with a particle size range of 50-80nm 2 The inorganic particles and the grafted diaphragm are placed in the mixed solution, stirred and hydrolyzed for 2 hours. After the membrane was washed with acetone, it was dried in a vacuum oven at 40° C. to o...

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Abstract

The invention discloses a preparation method of a lithium-ion secondary battery diaphragm with a crosslinking composite layer. The method comprises the following steps of: performing surface treatment on the polyolefin microporous membrane by using solution of strong oxidant to hydroxylate the surface of the membrane; preparing graft solution containing a grafting monomer, an initiator and a solvent; putting the surface-hydroxylated polyolefin microporous membrane into the graft solution and heating the solution in a water bath; in a protective atmosphere of nitrogen, performing graft polymerization on the surface of microporous membrane; preparing a mixed solution of absolute ethanol and water in a ratio of 9:1; and putting the grafted polyolefin microporous membrane and nano inorganic particles into the mixed solution to allow the nano inorganic particles to react with the polymer grafted on the surface of the diaphragm to form a crosslinked structure. The surface of the polyole finmicroporous membrane is modified or hydroxylated by using solution of strong oxidant. The crosslinked layer bonded to the surface of the diaphragm by chemical bonds can act for a long time, so the surface modification is lasting.

Description

technical field [0001] The invention relates to a manufacturing technology of a lithium-ion battery diaphragm, in particular to a preparation method of a porous composite diaphragm for a lithium-ion secondary battery. Background technique [0002] Lithium-ion battery is a new chemical power system developed rapidly in recent years. Compared with traditional nickel-cadmium or nickel-hydrogen batteries, it has the characteristics of high specific energy, long cycle life, and no memory effect. It is also safe, reliable and energy-efficient. Fast charging and discharging and other advantages. There is a membrane material between the positive electrode and the negative electrode of the lithium-ion battery, usually called the separator, which is an important part of the lithium-ion battery. The role of the separator is to prevent the physical contact between the positive and negative materials and allow lithium ions to pass through the micropores. Although the separator does not...

Claims

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Application Information

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IPC IPC(8): C08J9/36C08J9/40C08J7/16C08J7/12C08L23/00H01M2/16
CPCY02E60/12Y02E60/10
Inventor 蒋姗徐丹俞强朱梦冰丁永红姚自力朱威杨茜
Owner 扬州市永佳车辆配件有限公司
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