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Aromatic polyamide porous membrane, preparation method of the same and lithium ion secondary battery

A technology of aromatic polyamide and porous membrane, which is applied to battery components, circuits, electrical components, etc., and can solve problems such as very high temperature and humidity requirements, increased battery internal resistance, and long production time

Active Publication Date: 2018-07-31
微宏先进膜公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high heat resistance of aromatic polyamide polymers, TIPS is not suitable for the preparation of aromatic polyamide polymer porous membranes.
In the solvent phase inversion method (NIPS), the diaphragm is prepared during the process of transforming the polymer solution in which the solvent system is the continuous phase into a three-dimensional macromolecular network gel in the continuous phase. However, the aromatic polyamide polymer has a high degree of molecular orientation. , with very high crystallinity, it is easy to form a dense skin structure, resulting in poor air permeability of the porous film, which increases the internal resistance of the battery in battery applications
Toray Corporation (patent publication No. US20080113177A1) can form an aromatic polyamide porous membrane by adding a phase separation control agent that prevents aramid resin from agglomerating, but this solution requires very high temperature and humidity, and the production time is long, making it difficult Realize industrialization

Method used

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  • Aromatic polyamide porous membrane, preparation method of the same and lithium ion secondary battery
  • Aromatic polyamide porous membrane, preparation method of the same and lithium ion secondary battery
  • Aromatic polyamide porous membrane, preparation method of the same and lithium ion secondary battery

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Experimental program
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Effect test

Embodiment 1

[0038] A polym-phenylene isophthalamide solution (8000 g) was obtained through two-stage screw polymerization, and the solvent was DMAC, wherein the polymer mass percent concentration was 11.1%. Above-mentioned solution enters gel bath to form film after being extruded by melt pump after die head after degassing, and gel bath is water and DMAC, and the proportion of the quality of water in the gel bath is 30%, and gel bath temperature is At 30°C, the gel time was 100 seconds. Next, the above-mentioned membrane is drawn into an extraction tank, the temperature of which is 80° C., and the solvent is extracted with water, thereby forming a membrane to be treated with a dense skin and a porous interior. The above-mentioned film to be treated is removed with a brush, then dried with hot air at a drying temperature of 100°C, and finally enters a high-temperature calibrating box at a calibrating temperature of 250°C. Winding is completed after static electricity is removed. The mea...

Embodiment 2

[0040] A polyphenylsulfone terephthalamide solution (6000 g) was polymerized in a reaction kettle, and the solvent was DMAC, wherein the mass percent concentration of the polymer was 33%. Methyltriethylammonium acetate (120g) and the polyphenylsulfone terephthalamide solution prepared above were metered into a twin-screw machine at a mass ratio of 1:5 to mix and disperse. After being extruded from the die, it enters a gel bath to form a film, and the gel bath is water and DMAC. The mass proportion of water in the gel bath is 20%, the temperature of the gel bath is 0° C., and the gel time is 200 seconds. Next, the above-mentioned membrane is drawn into an extraction tank, the temperature of which is 20° C., and the solvent is extracted with water, thereby forming a membrane to be treated with a dense skin and a porous interior. The above-mentioned film to be treated is removed with a silica gel scraper, dried with hot air at a drying temperature of 100°C, and finally enters a ...

Embodiment 3

[0042] A polym-phenylene isophthalamide solution (4000 g) was obtained through two-stage screw polymerization, the solvent was DMAC, and the polymer mass percent concentration was 25%. PEG-400 (polyethylene glycol 400, 333g) and the above-prepared polym-phenylene isophthalamide solution were metered and injected into the twin-screw machine at a mass ratio of 1:10 to mix and disperse, and passed through the melt after defoaming After the pump is extruded by the die, it enters the gel bath to form the film, and the gel bath is water and DMAC. The mass proportion of water in the gel bath is 36%, the temperature of the gel bath is 15° C., and the gel time is 100 seconds. Next, the above-mentioned membrane is drawn into an extraction tank, the temperature of which is 80° C., and the solvent is extracted with water, thereby forming a membrane to be treated with a dense skin and a porous interior. The above-mentioned film to be treated is removed by a brush, dried with hot air at a ...

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Abstract

The invention provides an aromatic polyamide porous membrane, a preparation method of the same and a lithium ion secondary battery. The aromatic polyamide porous membrane has a three-dimensional and network-like porous structure on the whole, and pores are micron in size. The network-like porous structure of the aromatic polyamide porous membrane is communicated from the inner part to the surfaceas a whole, the aromatic polyamide porous membrane is very suitable for a lithium battery diaphragm, the preparation method of porous membrane is simple and suitable for demands of large industrialization production.

Description

technical field [0001] The invention relates to an aromatic polyamide porous membrane, a preparation method thereof and a lithium ion secondary battery. Background technique [0002] Lithium battery separator is a kind of porous membrane. With the vigorous development of lithium battery industry, the demand for separator production has increased dramatically. The separator is one of the key components of the battery. It is located between the positive and negative electrodes of the battery to isolate the positive and negative electrodes to avoid short circuits inside the battery, and at the same time to ensure that lithium ions can pass through smoothly during charging and discharging. At present, the separators widely used in lithium-ion secondary batteries are mainly polyolefin melt-stretched separators. However, due to the limitation of the material of polyolefin materials, the operating temperature should not be too high. However, in the working environment of high-curr...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08L77/06C08L81/06H01M2/18H01M2/16H01M50/403H01M50/423H01M50/449H01M50/457H01M50/463H01M50/491
CPCC08J5/18C08J9/28C08J2201/0502C08J2381/06C08J2377/06C08L2203/14C08L2203/16C08L2203/20H01M50/463H01M50/411Y02E60/10
Inventor 孙庆津李翔黄和极
Owner 微宏先进膜公司
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