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

A technology of high temperature resistant layer and composite film, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of falling off, decreased high temperature resistance, affecting battery performance, etc., to reduce battery short circuit, improve peel strength, improve The effect of peel strength

Active Publication Date: 2014-04-02
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 comprising: grafting amino groups on the surface of inorganic ceramic particles, grafting carboxyl groups on the surface of a thermoplastic resin porous membrane; preparing inorganic ceramic particles grafted with amino groups on the surface The coating slurry is applied to at least one surface of the thermoplastic resin porous membrane grafted with carboxyl groups on the surface. During the preparation process, the carboxyl group grafted on the surface of the thermoplastic resin porous membrane undergoes a polymerization reaction with the amino group grafted on the surface of the inorganic ceramic particles, so that the inorganic ceramic layer is fixed on at least one surface of the thermoplastic resin porous membrane through polymerization.

[0032] In a specific embodiment of the present application, the above-mentioned gra...

Embodiment 1

[0039] A polypropylene film with a thickness of 16 μm was selected as the thermoplastic resin porous film

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

[0041] Add 6.0g of aluminum oxide with an average particle size of 300nm to the ethanol dispersion, stir and heat to about 45°C, adjust the pH to about 6.5, then slowly add 1.2g of 3-aminopropyl triethoxy to the ethanol dispersion base silane, keep 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, and obtain aluminum oxide with a surface-grafted coupling agent, and dry it in vacuum at room temperature.

[0042] (2) Carboxyl groups grafted on the surface of thermoplastic resin porous membrane

[0043] Dissolving 2wt% benzophenone in tetrahydrofuran to prepare a coated photosensitizer solution, soaking the polypropylene film in the photosensitizer solution for 2 minutes, taking it out and drying it, and irr...

Embodiment 2

[0048] A polyethylene film with a thickness of 12 μm is selected as the thermoplastic resin porous film

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

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

[0051] (2) Carboxyl groups grafted on the surface of thermoplastic resin porous membrane

[0052] Dissolve 2wt% benzophenone in tetrahydrofuran to prepare a coated photosensitizer solution, soak the polyethylene film in the photosensitizer solution for 2 minutes, take it out and dry it, and irradiate it with ultraviolet light for 5 minutes. Then immer...

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PUM

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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, in particular to a composite membrane with a high temperature resistant layer, a preparation method thereof and a battery. Background technique [0002] Due to the advantages of high energy density, high output voltage, long cycle life, and low environmental pollution, lithium-ion batteries have been widely used in small digital electronic products, and 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 fields, lithium-ion secondary battery safety accidents occur frequently, ranging from battery heating to igniting cars. The focus of global attention 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 causes violent chemical reactions. Bas...

Claims

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Application Information

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Patent Type & Authority Patents(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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