Polyolefin composite thin film and preparation and application thereof

A polyolefin, composite membrane technology, applied in chemical instruments and methods, synthetic resin layered products, structural parts, etc., can solve problems such as the inability to effectively improve the safety of lithium-ion batteries, and improve thermal safety and cyclability. , the effect of improving strength and improving thermal safety performance

Active Publication Date: 2008-07-02
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the shortcoming that the polyolefin composite film of the prior art still cannot really effectively improve the safety of lithium-ion batteries, to provide a polyolefin composite film that can really and effectively improve the safety of lithium-ion batteries and its preparation method and use

Method used

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  • Polyolefin composite thin film and preparation and application thereof
  • Polyolefin composite thin film and preparation and application thereof
  • Polyolefin composite thin film and preparation and application thereof

Examples

Experimental program
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Embodiment approach

[0048] According to the preparation method of the polyolefin composite film provided by the present invention, although it can be obtained by directly laminating the above polyolefin layer and the heat-resistant layer, preferably, according to a preferred embodiment of the present invention, the polyolefin composite film The preparation method of the film includes preparing a heat-resistant layer, and then coating a polyolefin substrate solution forming a polyolefin layer on the heat-resistant layer, drying and forming a film to obtain a composite heat-resistant layer loaded with a polyolefin film, and then applying the composite heat-resistant layer The hot layer is immersed in the extractant to extract the solvent in the polyolefin film to obtain a composite heat-resistant layer with air holes, which is the polyolefin composite film provided by the invention . The extractant is a solvent capable of dissolving the polyolefin resin solution but not dissolving the polyolefin su...

Embodiment 1

[0053] This example is used to illustrate the polyolefin composite film provided by the present invention and its preparation method.

[0054] 10.2 parts by weight of a mixture (molar ratio 1:1) consisting of benzophenone tetraacid dianhydride (analytical pure) and diaminodiphenyl ether (analytical pure), 1.8 parts by weight of polyether polyurethane with a weight average molecular weight of 22000 And 82 parts by weight of N-methylpyrrolidone (NMP) stirred and reacted for 10 hours at 10°C to obtain the intrinsic viscosity η int =220 ml / g (measurement conditions: Ubbelohde viscometer, constant temperature 30°C, solution diluted to a solid content of 0.005 g / ml) viscous polyamic acid solution. Then apply the above solution evenly on a clean and smooth glass plate with a QTG type film applicator, put it in a 90°C drying oven to dry for 1 hour, and then program the temperature to 300°C for imidization for 1 hour , to obtain a polyimide film, and then raise the temperature to 350°...

Embodiment 2

[0057] This example is used to illustrate the polyolefin composite film provided by the present invention and its preparation method.

[0058] 10.2 parts by weight of a mixture (molar ratio 1:1) consisting of biphenyltetracarboxylic dianhydride (analytical pure) and p-phenylenediamine (analytical pure), 1.8 parts by weight of polymer chains containing amino groups at one end of the polymer chain with a weight average molecular weight of 18000 Polypropylene oxide and 82 parts by weight of DMAc were stirred and reacted for 10 hours at 10°C to obtain intrinsic viscosity η int =220 ml / g (measurement conditions: Ubbelohde viscometer, constant temperature 30°C, solution diluted to a solid content of 0.005 g / ml) viscous polyamic acid solution. Then apply the above solution evenly on a clean and smooth glass plate with a QTG type film applicator, put it in a 90°C drying oven to dry for 1 hour, and then program the temperature to 300°C for imidization for 1 hour , to obtain a polyimid...

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Abstract

The invention relates to a polyolefin compound film, comprising a polyolefin layer and a refractory coating which are adhered together. The refractory coating comprises a refractory material and vents distributed on the material, wherein, an average diameter of the vents on the material is not greater than 1 micron. The polyolefin compound film provided by the invention is provided with high strength and independent film layer structure can be preserved even after the polyolefin layer is melted and collapses. If the polyolefin compound film provided by the invention is used as a diaphragm of a lithium ion battery, the refractory layer of the compound film can avoid a contact between an anode and a cathode of the battery and prevent short circuit of the battery even though the polyolefin layer of the diaphragm is melted and collapses so as to really enhance the thermal security capability of the lithium ion battery. The polyolefin compound film provided by the invention has the advantages that the refractory capability is excellent; heat-shrinking is little and the strength is high. By being adopted as the diaphragm of a lithium ion secondary battery, the invention can effectively enhance the thermal security capability and circulation capability of the battery.

Description

technical field [0001] The invention relates to a polyolefin composite film and its preparation method and application. Background technique [0002] With its high specific energy, high voltage, small size, light weight, and no memory, lithium-ion secondary batteries have achieved tremendous development in the past ten years and have become one of the main energy sources for communication electronic products. However, under abuse conditions, lithium-ion secondary batteries are prone to safety hazards such as smoke, fire, explosion, and even personal injury, so high-capacity and power lithium-ion batteries have not been widely used. Therefore, improving the safety of lithium-ion batteries is the key to the development of lithium-ion batteries. [0003] A liquid electrolyte lithium ion secondary battery generally includes a pole core, a battery case and an electrolyte, the pole core and the electrolyte are sealed in the battery case, the pole core includes a positive pole, a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/06B32B27/08B32B37/14B32B38/08B32B3/24C08J9/00H01M2/16H01M50/403H01M50/417H01M50/449H01M50/491
CPCY02E60/10
Inventor 陈涛江林宫清
Owner BYD CO LTD
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