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Isolating membrane and manufacturing method thereof

A manufacturing method and technology of isolation film, which can be applied to electrical components, circuits, battery pack components, etc., can solve the problems of reducing battery efficiency, reducing the permeability of isolation film, and poor battery performance.

Inactive Publication Date: 2020-11-06
BENQ MATERIALS WUHU CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the existing isolation film with heat-resistant layer of inorganic particles, which is subjected to the stretching process first and then the coating process, the holes on the isolation film are easily covered by the coating slurry during the slurry coating process. Reducing the gas permeability of the separator will also increase the internal resistance of the lithium battery due to the reduction of the electrolyte that the separator can absorb, reducing battery performance
In addition, because the inorganic particles are easy to absorb moisture, the moisture content of the separator will be greatly increased
Because if there is a high content of water in the battery system, it is easy to cause poor battery performance, which is not desirable in product applications

Method used

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  • Isolating membrane and manufacturing method thereof
  • Isolating membrane and manufacturing method thereof
  • Isolating membrane and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Add 50 grams of alumina (Al2O3) particles (AHP 200, d50 is about 0.6 microns, purchased from Japan Light Metal, Japan) into 100 grams of polyacrylate amine dispersant aqueous solution with a concentration of 0.5%, and stir to obtain a concentration of 50%. Alumina dispersion aqueous solution. Next, 5 grams of water-soluble polyacrylate (BM-2000M, available from ZEON, Japan) and 1 gram of silicone surfactant (BYK-349, available from BYK-Chemie GmbH, Germany) were added as wetting agents to the aforementioned Alumina is dispersed in an aqueous solution to form a heat-resistant coating slurry. Then, the heat-resistant coating slurry was coated on the non-porous PP / PE / PP three-layer precursor substrate with a thickness of 21 micrometers (μm), and then the coated non-porous PP / PE / PP three-layer was coated. The layer precursor substrate is subjected to a cold extension process along the first direction (the extension ratio is 45% and the extension temperature is 25°C), and t...

Embodiment 2

[0076] A porous isolation film with a heat-resistant layer was prepared in the same manner as in Example 1, except that the stretching ratio of the cold stretching process was changed to 30%, and the stretching ratio of the hot stretching process was changed to 140%. The film retracts by 15%.

[0077] The surface and cross section of the separator were observed with a scanning electron microscope (SEM). The surface image of SEM at 1,000 magnification is as follows image 3 As shown, the surface image of SEM at 4,500 magnification is as follows Figure 4 As shown, the cross-sectional view of SEM at 2,000 magnification is as follows Figure 5 shown.

Embodiment 3

[0079] A porous isolation film with a heat-resistant layer was prepared in the same manner as in Example 1, except that the stretching ratio of the cold stretching process was changed to 30%, and the stretching ratio of the hot stretching process was changed to 150%. The film retracted by 11%.

[0080] The surface of the separator was observed with a scanning electron microscope (SEM). The surface image of SEM at 200 magnification is as follows Image 6 As shown, the surface image of SEM at 600 magnification is as follows Figure 7 shown.

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Abstract

The invention discloses an isolating membrane and a manufacturing method thereof, the isolating membrane comprises a base material with a porous structure and a heat-resistant layer, and the heat-resistant layer is arranged on one side surface or two side surfaces of the base material with the porous structure. The heat-resistant layer comprises an adhesive and a plurality of inorganic particles,wherein the coverage rate of the heat-resistant layer on the substrate is between 10% and 90%. According to the invention, inorganic particles in the coating slurry can be prevented from blocking micropores in a base material, so that the prepared isolating membrane has good air permeability and relatively low alternating current impedance. Meanwhile, the heat-resistant layer can still improve theheat resistance and the puncture strength of the isolating membrane, and can also maintain relatively low water content.

Description

technical field [0001] The present invention relates to a separator, and in particular, to a porous separator having a heat-resistant layer containing inorganic particles. Background technique [0002] Due to the rapid development of electric vehicles (EV, Electric Vehicle) and the 3C field, which are environmentally friendly, the demand for lithium-ion battery energy storage systems with high energy density and power density is increasing. Separator is a polymer film used in lithium batteries. It is interposed between the positive electrode and the negative electrode to prevent the electrodes from short-circuiting due to physical contact. At the same time, the microporous structure of the separator allows free ions in the electrolyte to pass therethrough, enabling the battery to generate voltage. Therefore, the stability of the separator will directly affect the performance of the battery. When the micropores in the separator are blocked, the total amount of electrolyte th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/18
Inventor 叶威廷黄一芳郑凯维李育叡罗婉婷
Owner BENQ MATERIALS WUHU CORP
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