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Preparation method of universal pattern distributed glued diaphragm

A distributed, patterned technology, applied in electrical components, electrochemical generators, circuits, etc., can solve the problems of uneven coating, uneven pattern, inconsistency, etc., to ensure consistency, pattern distribution, and enhance service life. Effect

Active Publication Date: 2020-04-24
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the safety and thermal stability of the separator, etc., it is necessary to coat a layer of slurry on the surface of the separator, and the traditional coating or roller coating method will lead to uneven coating, and it is difficult to control and maintain the viscosity over time , causing the performance of the diaphragm and lithium battery to be affected
[0003] Chinese patent CN109155383A discloses an ink composition for a secondary battery separator, a secondary battery separator comprising the ink composition and a preparation method thereof, the ink composition comprising: an adhesive; water; at 20°C A first solvent having a surface energy of 30 mN / m or less; and a second solvent having a vapor pressure of 2 kPa or less at 20° C., wherein the first solvent and the second solvent are different from each other, adopting this scheme can make The ink composition is evenly coated on the substrate. However, due to the uniform surface energy of the substrate as a whole, it is only suitable for overall coating, and it is easy to cause uneven and inconsistent patterns when coating special patterns, which will affect the performance of lithium batteries.

Method used

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  • Preparation method of universal pattern distributed glued diaphragm
  • Preparation method of universal pattern distributed glued diaphragm
  • Preparation method of universal pattern distributed glued diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0027] This example provides a method for preparing a universal pattern distributed glue-coated diaphragm. First, a 12 μm PE base film is prepared; then the preset pattern is a circle, and the parameter settings of the plasma surface treatment device are adjusted so that the shape of the plasma surface treatment is a circle. shape, and then use the device to surface-treat the PE base film so that the preset pattern is evenly distributed, and the distance between the center points of the preset pattern is 5 μm. Use a surface energy measuring instrument to measure the surface energy of the plasma surface treatment position and the plasma surface treatment position respectively, wherein the surface energy of the plasma surface treatment position is 60mN / m, and the surface energy of the plasma surface treatment position Can be 30mN / m. Prepare the slurry at the same time, and the slurry includes the following components: PVDF: acrylate adhesive: triammonium citrate dispersant: wett...

Embodiment 2

[0030] The difference between this embodiment and embodiment 1 is: as attached figure 2 As shown, (1) the preset pattern is rectangular; (2) the composition and proportion of the slurry are: PVDF: acrylate adhesive: triammonium citrate dispersant: wetting agent sodium alkylsulfonate: anti-corrosion Precipitating agent polyolefin wax: water=1: 0.05: 0.01: 0.01: 0.01: 8.0, the surface tension of the slurry measured by a surface energy measuring instrument is 36mN / m; (3) the coating thickness of the slurry is 10 μm .

[0031] During the coating process, it was found that the slurry could only be coated on the positions that had undergone plasma surface treatment, while the slurry could not adhere to the positions that had not undergone plasma surface treatment.

Embodiment 3

[0033] The difference between this embodiment and embodiment 1 is: as attached image 3 As shown, (1) the preset pattern is a five-pointed star; (2) the composition and ratio of the slurry are: PVDF: CNT: acrylate adhesive: triammonium citrate dispersant: wetting agent alkylsulfonate Sodium acid: anti-settling agent polyolefin wax: water = 1: 1: 0.05: 0.01: 0.02: 0.01: 8.0, in which CNT can improve the charge and discharge performance of the battery, increase the energy density of the battery, and use the surface energy measuring instrument to measure the slurry The surface tension of the slurry is 45mN / m; (3) the coating thickness of the slurry is 0.5μm.

[0034] During the coating process, it was found that the slurry could only be coated on the positions that had undergone plasma surface treatment, while the slurry could not adhere to the positions that had not undergone plasma surface treatment.

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Abstract

The invention discloses a preparation method of a universal pattern distributed glued diaphragm. The preparation method comprises the following steps: S1, preparing a base membrane; S2, performing plasma surface treatment of a preset pattern on the membrane surface of the base membrane; and S3, coating the base membrane with slurry to obtain the glued diaphragm, wherein the surface tension of theslurry is between the surface energy interval of the position, not subjected to plasma surface treatment, of the base membrane and the surface energy interval of the position, subjected to the plasmasurface treatment, of the base membrane, and the slurry can only be adhered to the position, subjected to the plasma surface treatment, of the base membrane. According to the invention, the diaphragmcan be coated with slurry of customized patterns, and the slurry is tightly bonded with the base membrane; and meanwhile, the patterns are uniformly distributed, so that the consistency of slurry coating is ensured, and the service life of a lithium battery is prolonged.

Description

technical field [0001] The invention belongs to the field of battery diaphragms, and in particular relates to a preparation method of a distributed glue-coated diaphragm with a universal pattern. Background technique [0002] Lithium-ion batteries have been widely used in many fields due to their advantages such as high specific energy, long cycle life, and environmental friendliness. In the structure of lithium-ion batteries, the separator is one of the key inner components. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. The main function of the diaphragm is to separate the positive and negative electrodes of the battery, prevent the two electrodes from contacting and short circuit, and also have the function of allowi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/449Y02E60/10
Inventor 王成豪李正林张立斌尚文滨
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD