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Funnel type lithium battery diaphragm and production method thereof

A technology for lithium battery separators and production methods, which is applied to battery components, circuits, electrical components, etc., can solve the problems of general liquid-hanging ability of microporous membranes, unfavorable ion passage, and unstable porosity, etc., and achieve overall tensile strength The effect of good strength, uniform micropore density and fast production speed

Inactive Publication Date: 2012-10-31
허난구오안일렉트릭머터리얼컴퍼니리미티드
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AI Technical Summary

Problems solved by technology

The production speed of this method is slow, and the cost is high, the pollution is large, and the process is complicated
The ability of the microporous membrane hanging liquid (electrolyte adsorbed by the membrane) produced by the two is average, which is not conducive to the passage of ions
[0003] Generally, the stability of the lithium battery separator with a thickness of more than 30 microns is acceptable, but the stability of the separator with a thickness of 25 microns or less is poor, the film thickness deviation is large, and the porosity is unstable

Method used

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  • Funnel type lithium battery diaphragm and production method thereof
  • Funnel type lithium battery diaphragm and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] as attached figure 1 , 2 As shown, a funnel-shaped lithium battery separator includes a base film layer 1, one side of the base film layer 1 is bonded with an anti-etching protective film layer 3 through a release agent and a glue layer 2, and the inside of the base film layer 1 is uniformly distributed There are funnel-shaped micropores and micropores 11 .

[0025] The ratio of the largest diameter to the smallest diameter of the micropores 11 is 3:1 to 10:1.

Embodiment 2

[0027] A method for producing a funnel-type lithium battery diaphragm, comprising the following steps:

[0028] 1) Using polyethylene terephthalate plastic film as the substrate, irradiating the plastic film with high-energy particles;

[0029] The irradiation power is 2,000-10,000 kilowatts, the irradiation time is 0.5-200 seconds, and the micropore density is adjusted by adjusting the irradiation energy and irradiation time to obtain a micropore density ranging from 100,000 to 20 million per square centimeter;

[0030] 2) Coat release agent and glue on either side of the plastic film, and then compound a layer of anti-etching protective film;

[0031] 3) Dip the composite plastic film in a solution containing acid or alkali for etching reaction. The etching reaction temperature is 70°C-90°C, the etching time is 0.2-60 minutes, and the obtained micropore diameter ranges from 0.5 microns to 5 microns, the pore size can be finely adjusted by adjusting the concentration of lye ...

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Abstract

The invention relates to the field of a lithium battery processing production technology, and in particular relates to a funnel type lithium battery diaphragm and a production method of the diaphragm. The funnel type lithium battery diaphragm has the structure of comprising a base film layer; one side of the base film layer is stuck and connected with a protective film layer capable of resisting etching by a release agent and a glue water layer; and the base film layer is internally and evenly distributed with funnel type micropores. The lithium battery diaphragm produced by the method has the characteristics of being thin in thickness, even in density of the micropores, easy in control of aperture, rapid in production speed, high in production efficiency, high in tensile strength, etc.

Description

technical field [0001] The invention relates to the technical field of lithium battery processing and production, in particular to a funnel-shaped lithium battery diaphragm and a production method thereof. Background technique [0002] Lithium batteries are widely used due to their large capacity and almost no memory effect. A diaphragm is needed between the positive and negative motors of lithium batteries to allow ions to pass through smoothly, but electrons cannot pass through, and can only be moved from the negative pole to the positive pole by an external circuit. At present, the main methods used in the production of lithium battery separators are: 1. Stretching method (dry method): the plastic film is heated to a certain temperature, and stretched by physical methods to make the molecular chain produce larger gaps. This method is difficult to control the pore density and pore size, and the micropore uniformity is poor. Because only longitudinal stretching is performe...

Claims

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Application Information

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IPC IPC(8): H01M2/18
CPCY02E60/12Y02E60/10
Inventor 崔清臣凌红旗黄海龙
Owner 허난구오안일렉트릭머터리얼컴퍼니리미티드
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