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Composite film with high-temperature resistance layer, preparation method thereof and battery

A high-temperature-resistant layer and composite film technology, which is applied to battery components, circuits, electrical components, etc., can solve problems such as high-temperature resistance decline, shedding, and impact on battery performance, so as to improve peel strength, reduce battery short circuit, and improve The effect of peel strength

Active Publication Date: 2013-05-01
SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the separators produced by these technologies and the inorganic ceramic fillers are easy to fall off from the surface of the separator, which not only reduces the high temperature resistance, but also affects the performance of the battery.

Method used

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  • Composite film with high-temperature resistance layer, preparation method thereof and battery
  • Composite film with high-temperature resistance layer, preparation method thereof and battery

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preparation example Construction

[0031] The present application provides a method for preparing the above-mentioned composite membrane with a high temperature resistant layer. The method comprises: grafting amino groups on the surface of inorganic ceramic particles, grafting carboxyl groups on the surface of the thermoplastic resin porous membrane; preparing inorganic ceramic particles with amino groups on the surface. The coating slurry is applied to at least one surface of the porous thermoplastic resin film grafted with carboxyl groups on the surface. During the preparation process, the carboxyl groups grafted on the surface of the thermoplastic resin porous film and the amino groups grafted on the surface of the inorganic ceramic particles undergo polymerization reaction, so that the inorganic ceramic layer is fixed on at least one surface of the thermoplastic resin porous film through polymerization.

[0032] In a specific embodiment of the present application, the grafting of amino groups on the surface of ...

Embodiment 1

[0039] The thermoplastic resin porous film is a polypropylene film with a thickness of 16μm

[0040] (1) Aminosilane coupling agent modifies the surface of inorganic ceramic particles

[0041] Add 6.0g of aluminum oxide with an average particle size of 300nm to the ethanol dispersion and stir and heat to about 45°C, adjust the pH to about 6.5, and then slowly add 1.2g of 3-aminopropyltriethoxy to the ethanol dispersion Base silane, keeping the temperature of the ethanol dispersion at about 45°C and the pH value at about 6.5, react for 1 hour, wash with acetone to obtain the aluminum oxide grafted with the coupling agent on the surface, and dry at room temperature under vacuum.

[0042] (2) The surface of the thermoplastic resin porous membrane is grafted with carboxyl groups

[0043] 2wt% of benzophenone was dissolved in tetrahydrofuran to prepare a coated photosensitizer solution, the polypropylene film was immersed in the photosensitizer solution for 2 minutes, then taken out and dr...

Embodiment 2

[0048] The thermoplastic resin porous film is a polyethylene film with a thickness of 12μm

[0049] (1) Aminosilane coupling agent modifies the surface of inorganic ceramic particles

[0050] Add 8.0g of aluminum oxide with an average particle size of 500nm into the ethanol dispersion and stir and heat to about 55°C, adjust the pH to about 7.5, slowly add 1g of 3-aminopropyltriethoxysilane to maintain the temperature of the ethanol dispersion At about 55°C, the pH value is about 7.5, react for 1 hour, wash with acetone to obtain the aluminum oxide grafted with the coupling agent on the surface, and dry in vacuum at room temperature.

[0051] (2) The surface of the thermoplastic resin porous membrane is grafted with carboxyl groups

[0052] 2wt% of benzophenone by weight was dissolved in tetrahydrofuran to prepare a coated photosensitizer solution, the polyethylene film was immersed in the photosensitizer solution for 2 minutes, then taken out and dried, and exposed to ultraviolet ligh...

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Abstract

The application relates to the field of lithium batteries, and particularly discloses a composite film with a high-temperature resistance layer, a preparation method thereof and a battery. The composite film disclosed by the application comprises a base film and the high-temperature resistance layer, wherein the base film is a porous thermoplastic resin film; the high-temperature resistance layer is an inorganic ceramic layer containing ceramic particles; the inorganic ceramic layer is fixed on at least one surface of the porous thermoplastic resin film by polymerization; and the peel strength of the porous thermoplastic resin film and the inorganic ceramic layer is larger than or equal to 25 N / m under the condition of 180 DEG C. The invention further discloses the preparation method and the application of the composite film and the battery adopting the composite film. According to the application, the peel strength of inorganic ceramic layer and the porous thermoplastic resin film is greatly improved so as to effectively avoid a powder falling phenomenon of the inorganic ceramic particles in the composite film. Meanwhile, the composite film has excellent high temperature resistance performance, and can reduce battery short circuit phenomena caused by heat shrinkage of the composite film in the application.

Description

Technical field [0001] The application relates to the field of lithium ion batteries, and in particular to a composite film with a high temperature resistant layer, a preparation method thereof, and a battery. Background technique [0002] Lithium-ion batteries have been widely used in small digital electronic products because of their high energy density, high output voltage, long cycle life, and low environmental pollution. They also have broad application prospects in electric vehicles, aerospace and other fields. However, with the rapid development of lithium-ion batteries and the expansion of application areas, safety accidents of lithium-ion secondary batteries have occurred frequently, ranging from battery heating to as large as igniting automobiles. The global focus on lithium-ion batteries has shifted to safety. The safety problem of lithium batteries mainly lies in the short-circuit contact between the positive and negative electrodes, which triggers violent chemical re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16
CPCY02E60/12Y02E60/10
Inventor 曹志锋黄丽芳
Owner SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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