Lithium ion battery membrane with porous composite coating and preparation method thereof

A lithium-ion battery and composite coating technology, which is applied to battery components, circuits, electrical components, etc., can solve problems such as easy to fall off, difficult to uniformly disperse inorganic particles, reduce the strength and thermal stability of composite diaphragms, and achieve guaranteed Dimensional stability, heat shrinkage reduction, and integrity maintenance effects

Active Publication Date: 2012-11-07
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

[0011] The technical problem to be solved by the present invention is: the inorganic particles are difficult to disperse

Method used

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  • Lithium ion battery membrane with porous composite coating and preparation method thereof
  • Lithium ion battery membrane with porous composite coating and preparation method thereof
  • Lithium ion battery membrane with porous composite coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] According to the existing industrial technology, a polypropylene microporous membrane was prepared by uniaxial stretching process, with a thickness of 38 μm, a closed cell temperature of 153 °C, a porosity of 45%, and an air permeability of 365 (Gurley value, unit: s). The carbon nanotubes are commercially available conventional multi-walled carbon nanotubes with a diameter in the range of 10-20 nm and a length in the range of 3-10 μm.

[0044] Surface grafting modification of carbon nanotubes: put the carbon nanotubes in an oven and raise the temperature to 400° C., heat for about 2 hours and wash with 6M HCl. Weigh 1.5g of purified carbon nanotubes, 0.075g of cerium ammonium nitrate, and 0.15g of α-methylstyrene, dissolve them in 200mL of dimethyl sulfoxide, disperse them with ultrasonic waves for 20 minutes, and react them at 70°C for 12 Hour. Afterwards, the mixed solution was cooled, washed with tetrahydrofuran, and dried to obtain modified carbon nanotubes.

[0...

Embodiment 2

[0048] The coating solution in Example 1 was coated on the other surface of the composite coating separator obtained in Example 1, and vacuum-dried to obtain a polypropylene separator with a double-sided composite coating. The performance test results are shown in Table 1.

Embodiment 3

[0050] The polypropylene microporous membrane in Example 1 was used.

[0051] Surface graft modification of carbon nanotubes: firstly, the carbon nanotubes are purified by conventional methods. Weigh 1.5g of purified carbon nanotubes, 0.075g of potassium persulfate, and 0.2g of p-phenylstyrene and dissolve them in 200mL of tetrahydrofuran, disperse them with ultrasonic waves for 20 minutes, and react at 70°C for 12 hours; then cool The mixed solution was washed with tetrahydrofuran and dried to obtain modified carbon nanotubes.

[0052] Polyp-phenylstyrene was dissolved in N,N-dimethylformamide to prepare a binder polymer solution. The modified carbon nanotubes are dispersed therein through strong stirring to obtain the desired coating solution. Wherein, the weight ratio of the modified carbon nanotubes to the binder polymer is 15:85. The coating solution is coated on the polypropylene microporous membrane, and vacuum-dried to obtain a polypropylene separator with a coating...

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Abstract

The invention provides a polyolefin membrane with a porous composite coating and a preparation method of the polyolefin membrane. The polyolefin membrane with the porous composite coating comprises a microporous polyolefin membrane prepared by a uniaxial tension process and a porous composite coating with good heat-resistant quality, wherein the porous composite coating is formed on at least one surface of the microporous polyolefin membrane. The porous composite coating is formed from the mixture of a modified carbon nano tube and an organic polymer. The mixture is scattered and dissolved in an organic solution to form coating liquid. The coating liquid is coated on the surface of the microporous membrane and then is subjected to rapid vacuum drying to form the porous composite coating. The prepared polyolefin membrane with the porous composite coating has the characteristics of high porosity, high gas transmission rate, high thermal contraction distortion temperature and excellent heat resistance and dimensional stability, and is suitable for a high-capacity lithium battery.

Description

technical field [0001] The invention relates to a functional thin film and a preparation method thereof, in particular to a lithium ion battery diaphragm 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, and 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 separator is an important part of the lithium-ion battery. Its function is to prevent the physical contact between the positive and negative electrodes and allow the ion flow to pass through the micropores of the separator, so as to ensure that the lithium ions are separated between the positive and negative electrodes during the charging and discharging process of the battery. Fast transfer between. The structure and performance of the ...

Claims

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Application Information

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IPC IPC(8): H01M2/16
CPCY02E60/12Y02E60/10
Inventor 蒋姗朱梦冰姚自力杨茜俞强邱圆鑫丁永红朱威张洪文
Owner 扬州市永佳车辆配件有限公司
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