Preparation method of battery diaphragm

A battery diaphragm and ceramic diaphragm technology, which is applied in the field of battery diaphragm preparation, can solve problems such as the inability to achieve industrialization of coating, plugging of spraying technology, complicated operation, etc., and achieve good battery capacity retention rate, good spraying stability, and simple method easy effect

Active Publication Date: 2019-08-20
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the screen printing technology used in this patent cannot realize the industrialization of coating; the spraying technology also has the problem of plugging holes or needles
[0006] Chinese patent CN107611315A discloses a point-shaped PDVF coating method for battery separators, but this method mainly uses an atomizer for spraying, and the nozzle of the atomizer is small, and it is easy to block when spraying PVDF macromolecules. The actual continuous production operation Cannot solve the problem of plugged holes, so it is more difficult to implement
[0007] In addition, the dot PDVF coating method can also use spin coating equipment, but the spin coating equipment is expensive, the operation is complicated, and the cost is high.

Method used

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  • Preparation method of battery diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0049] 1. Coating of ceramic coating solution

[0050] ①Add 25g of alumina ceramics to 100g of deionized water, add dispersant polyethylene glycol and 0.2g of octadecyltrimethylammonium chloride, and stir at 3000r / min for 4h at high speed; ②Add 0.6g of carboxymethyl fiber Add plain sodium and 0.5g polyvinylpyrrolidone one by one, stir until dissolved, the stirring speed is 1000r / min; ③Continue to add 1g tridecafluorooctyltriethoxysilane, stir and disperse evenly for 4h, the stirring speed is 1000r / min , to obtain a ceramic coating solution; ④ use a flat coater to coat the ceramic coating solution on the base film, and dry it for later use. Note that steps ③ and ④ are carried out under dark conditions; the thickness of the obtained ceramic separator is 16 μm.

[0051] 2. UV light

[0052] use figure 1 The mask plate shown (Cr PHOTO-MASK with photolithographic chromium version, circle diameter and spacing is 500μm) is subjected to UV light at an intensity of 250mj / cm 2 , the ...

Embodiment 2

[0056] 1. Coating of ceramic coating solution

[0057] ①Add 25g of alumina ceramics to 100g of deionized water, add dispersant polyethylene glycol and 0.2g of octadecyltrimethylammonium chloride, and stir at 3000r / min for 4h at high speed; ②Add 0.6g of carboxymethyl fiber Add plain sodium and 0.5g polyvinylpyrrolidone one by one, stir until dissolved, the stirring speed is 1000r / min; ③Continue to add 3g of octadecylfluorodecyltriethoxysilane, stir and disperse for 4h, the stirring speed is 1000r / min, get Ceramic coating solution; ④ Use a flat coater to coat the ceramic coating solution on the base film, dry it for later use, and pay attention to steps ③ and ④ under dark conditions; the thickness of the obtained ceramic separator is 16 μm.

[0058] 2. UV light

[0059] use figure 1 The mask plate shown (Cr PHOTO-MASK photolithographic chromium version, circle diameter and spacing is 500 μm) is subjected to ultraviolet light with an intensity of 350 mj / cm2 and a light time of ...

Embodiment 3

[0063] 1. Coating of ceramic coating solution

[0064] ①Add 25g of alumina ceramics to 100g of deionized water, add dispersant polyethylene glycol and 0.2g of octadecyltrimethylammonium chloride, and stir at 3000r / min for 4h at high speed; ②Add 0.6g of carboxymethyl fiber Add plain sodium and 0.5g polyvinylpyrrolidone one by one, stir until dissolved, the stirring speed is 1000r / min; ③ continue to add 5g heptadecafluorodecyltriethoxysilane, stir and disperse evenly for 4h, the stirring speed is 1000r / min, get Ceramic coating solution; ④ Use a flat coater to coat the ceramic coating solution on the base film, dry it for later use, and pay attention to steps ③ and ④ under dark conditions; the thickness of the obtained ceramic separator is 16 μm.

[0065] 2. UV light

[0066] use figure 1 The mask plate shown (Cr PHOTO-MASK photolithographic chromium version, circle diameter and spacing is 500 μm) is subjected to ultraviolet light with an intensity of 500 mj / cm2 and a light tim...

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Abstract

The invention provides a preparation method of a battery diaphragm. The preparation method comprises the following steps: S1, coating a ceramic coating solution containing a hydrophobic substance on abase membrane under a light shielding condition to obtain a ceramic diaphragm; S2, covering the ceramic diaphragm obtained in the step S1 with a mask with a pattern, and carrying out ultraviolet irradiation to obtain a ceramic diaphragm with a hydrophilic part and a hydrophobic part; and S3, coating the ceramic diaphragm obtained in the step S2 with the polyvinylidene fluoride dispersion liquid.By adding a hydrophobic substance into a ceramic formula, the problems of hole blockage and needle blockage during spraying are solved. PVDF dot matrix coating can be achieved only through a traditional coating mode, so high-price equipment is not used, and cost is reduced. The performance of the product is equivalent to or better than that of the existing dot matrix PVDF diaphragm, so that the market requirement is met. The method is simple and easy to implement, and the dot matrix PVDF coated diaphragm can be produced on a large scale.

Description

technical field [0001] The invention relates to the field of preparation methods of battery separators, in particular to a preparation method of battery separators. Background technique [0002] The battery diaphragm refers to a layer of diaphragm material between the positive and negative electrodes of the battery. It is a very critical part of the battery and has a direct impact on battery safety and cost. Its main function is to isolate the positive and negative electrodes and prevent the electrons in the battery from Freely pass through, allowing the ions in the electrolyte to pass freely between the positive and negative electrodes. [0003] Separator surface modification is an important way to improve the performance of battery separators, and the common method is surface coating. The surface coating method is mainly to modify the separator and improve the performance of the battery separator by coating or depositing a thin layer of functional film on the surface. Th...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411H01M50/431H01M50/449Y02E60/10
Inventor 李义涛肖文武程宗盛黄连红何鑫吴慧娟尹松青
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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