Lithium battery diaphragm for power battery and preparation method thereof

A technology for lithium battery separators and power vehicles. It is applied in the direction of batteries, lithium batteries, battery pack components, etc. It can solve the problems of battery combustion, hole generation, and size shrinkage, so as to improve heat shrinkage resistance, thermal stability, The effect of improving safety

Inactive Publication Date: 2017-07-07
湖南中智优库科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the defects in the prior art that the lithium battery diaphragm in the power battery will shrink obviously when heated, and produce holes, which will cause the positive and negative electrodes to contact and short circuit, and then cause accidents such as battery combustion, the present invention designs and prepares a safe Lithium battery separator with better performance

Method used

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  • Lithium battery diaphragm for power battery and preparation method thereof

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Embodiment 1

[0046] Such as figure 1 The lithium battery separator for power vehicles shown has four layers, which are base film 1, nano flame retardant layer 2, electrospun nanofiber layer 3 and thermal closure layer 4 from bottom to top, wherein base film 1 is PET nuclear pore membrane with a thickness of 5 μm to 20 μm, the nano flame retardant layer 2 is a flame retardant ceramic slurry with a thickness of 0.5 μm to 10 μm, the electrospun nanofiber layer 3 is 2 μm to 5 μm in thickness, and the thermal closure layer 4 is made of 5 μm to 10 μm in thickness High temperature resistant epoxy resin. Among them, the etched pore diameter of the PET nuclear pore membrane is 0.1 μm to 1.0 μm, and the density is 1×10 5 ~5×10 6 / cm 2 . The polymer material of the electrospun nanofiber layer is polyacrylonitrile, polyimide or polyvinylidene fluoride.

preparation Embodiment 1

[0047] Preparation Example 1: Preparation of Lithium Battery Diaphragm for Power Vehicles

[0048] The preparation of step (1) PET nuclear pore membrane

[0049] Using a heavy ion accelerator to provide a window energy of 10MeV / u 86 K r 26+ The ions were irradiated to the PET film, the scanning current was 120nA, and then the irradiated PET nuclear pore film was chemically etched. The etching solution was an aqueous solution of sodium hydroxide with a concentration of 1M, the etching temperature was set at 70°C, and the etching time was 30 Minutes, after etching and cleaning with deionized water, the PET nuclear pore membrane layer was obtained.

[0050] Step (2) coating flame retardant ceramic slurry

[0051] The raw material formula of the flame-retardant ceramic slurry is calculated in parts by weight:

[0052] 0.05 parts of vinyltrimethoxysilane, 10 parts of nano-titanium dioxide, 5 parts of melamine polyphosphate, 30 parts of dimethylacetamide, 2 parts of styrene-but...

preparation Embodiment 2

[0062] Preparation Example 2: Preparation of Lithium Battery Diaphragm for Power Vehicles

[0063] The preparation of step (1) PET nuclear pore membrane

[0064] Using a heavy ion accelerator to provide a window energy of 50MeV / u 86 K r 26+ The ions were irradiated to the PET film, the scanning current was 200nA, and then the irradiated PET nuclear pore film was chemically etched. The etching solution was a sodium hydroxide aqueous solution with a concentration of 1M, the etching temperature was set at 90°C, and the etching time was 30 Minutes, after etching and cleaning with deionized water, the PET nuclear pore membrane layer was obtained.

[0065] Step (2) coating flame retardant ceramic slurry

[0066] The raw material formula of the flame-retardant ceramic slurry is calculated in parts by weight:

[0067] 3 parts of vinyltrimethoxysilane, 40 parts of nano silicon dioxide, 30 parts of melamine polyphosphate, 50 parts of solvent, 10 parts of polyacrylic acid, 2 parts o...

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Abstract

The invention provides a lithium battery diaphragm for power vehicles. The diaphragm has four layers, the layers are respectively from bottom to top a base diaphragm, a nanometer flame retarding layer, an electrospun nanofiber layer and a thermal closed layer, wherein the base diaphragm is a PET nuclear pore membrane with a thickness of 5 microns-20 microns, the nano meter flame retardant layer is a flame retardant ceramic slurry with a thickness of 0.5 micron-10 microns, the thickness of the electrospun nano-fiber layer is 2 microns-5 microns, and the heat closed layer is a heat-resistant epoxy resin with a thickness of 5 microns-10 microns. The invention also provides a preparation method of the lithium battery diaphragm; the heat-resistance and shrinkage performance of the prepared lithium battery diaphragm can be greatly improved, the thermal stability and thermal closed property are significantly improved, and the security is very good.

Description

technical field [0001] The invention belongs to the technical field of battery separators, and in particular relates to a lithium battery separator for power batteries and a preparation method thereof. Background technique [0002] Today, when the world focuses on the development of new energy industries such as electric vehicles and energy storage batteries, lithium batteries, as recognized as ideal energy storage components, have received higher attention. However, in recent years, a series of frequent fire accidents of lithium battery electric vehicles show that safety issues have become the primary bottleneck restricting the development of power lithium batteries for electric vehicles. In the structure of lithium 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 separato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/446H01M50/451H01M50/454H01M50/457H01M50/489
CPCH01M10/052H01M2220/20H01M50/431H01M50/411H01M50/44H01M50/403H01M50/449Y02E60/10
Inventor 赵新华
Owner 湖南中智优库科技有限公司
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