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High temperature and flame resistant diaphragm and making method thereof

A technology of high temperature resistance and diaphragm, which is applied in the field of battery and capacitor diaphragm to achieve the effects of good flame retardancy, wettability and cost reduction

Inactive Publication Date: 2017-07-11
SHANGHAI AOWEI TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diaphragm material used in the above method still has not fundamentally solved the problems of high temperature resistance and flame retardancy of the diaphragm

Method used

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  • High temperature and flame resistant diaphragm and making method thereof
  • High temperature and flame resistant diaphragm and making method thereof
  • High temperature and flame resistant diaphragm and making method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Dissolve a certain amount of polybenzimidazole in dimethyl sulfoxide (DMSO), stir continuously at 50°C to obtain a uniform solution, make a 15% to 30% spinning stock solution, and make it on an electrospinning machine A polybenzimidazole film framework with a porosity of 80% to 90% and a thickness of 0.015mm.

[0033] 2. Dissolve a certain amount of polyimide and cellulose diacetate in a certain proportion in dimethylacetamide (DMAc) organic solvent, stir at 60°C to obtain a uniform spinning solution, and then add a certain amount of 3- Aminopropyltriethoxysilane, stirred well for 24 hours.

[0034] Polyimide 57% (solid mass percent)

[0035] Cellulose diacetate 40%

[0036] 3-Aminopropyltriethoxysilane 3%

[0037] The amount of dimethylacetamide is prepared according to liquid:solid ratio of 10:1.

[0038] After the spinning solution is prepared according to the above method, it is then electrostatically spun to form a film, the spinning voltage is 25-30kV, and ...

Embodiment 2

[0042] 1. Dissolve a certain amount of polybenzimidazole in N,N-dimethylpyrrolidone (NMP) solvent, stir continuously at 50°C to obtain a uniform solution, and make a 15% to 30% spinning stock solution, A polybenzimidazole film skeleton with a porosity of 80% to 90% and a thickness of 0.012mm is formed by a spinning machine.

[0043] 2. Dissolve a certain amount of polyimide and cellulose acetate in a certain proportion in a dimethylformamide (DMF) organic solvent, stir at 60°C to obtain a uniform spinning solution, and then add a certain amount of vinyl three Ethoxysilane, stirred well for 36 hours.

[0044] Polyimide 65% (mass percentage)

[0045] Cellulose acetate 35%

[0046] Vinyltriethoxysilane 5%

[0047] The amount of dimethylformamide is prepared according to liquid:solid at 8:1.

[0048] After the spinning solution is prepared according to the above method, it is then electrospun to form a film with a spinning voltage of 30kV and a spinning distance of 15cm. Afte...

Embodiment 3

[0051]1. Add a certain amount of polybenzimidazole into dimethylacetamide (DMAc), heat it to about 250°C while stirring, and add 1.5% lithium chloride, and after all dissolve, make 20% ~30% spinning dope, the spinning dope is adjusted to a mass concentration of about 25% and a viscosity of about 1500 Pa·s at room temperature. The polybenzimidazole fiber was prepared by dry spinning method, and the polybenzimidazole film skeleton of 0.017mm was prepared by wet non-woven fabric method.

[0052] 2. Dissolve a certain amount of polyimide and cellulose acetate in a certain proportion in dimethylacetamide (DMAc) organic solvent, stir at 60°C to obtain a uniform spinning solution, and then add a certain amount of vinyl three Methylsilane, stirred well for 36 hours.

[0053] Polyimide 65% (mass percentage)

[0054] Cellulose Triacetate 32%

[0055] Vinyltrimethylsilane 3%

[0056] The amount of dimethylformamide is prepared according to liquid:solid at 8:1.

[0057] After the spi...

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Abstract

The invention relates to a high temperature and flame resistant diaphragm and a making method thereof. The method comprises the following steps: 1, producing a polybenzimidazole film used as the skeleton of the diaphragm; 2, spinning a spinning solution containing polyimide, cellulose acetate and a silane coupling agent at both sides of the skeleton through an electrostatic spinning technology to form a preliminarily finished diaphragm; and 3, immersing the preliminarily finished diaphragm in a diluted acid solution, washing the preliminarily finished diaphragm with pure water to remove the superfluous acid solution, and carrying out rolling, winding and cutting to obtain the finished diaphragm. The high temperature and flame resistant diaphragm having excellent characteristics and keeping the excellent electrolyte infiltrating characteristic of a cellulose diaphragm can be produced through the method.

Description

[0001] [technical field] [0002] The invention relates to a battery and a capacitor diaphragm, in particular to a diaphragm with high temperature resistance and flame retardancy and a preparation method. [0003] [Background technique] [0004] With the advancement of technology and global concerns about energy shortages and environmental pollution, new energy vehicles are increasingly used in real life, and diaphragms are one of the key raw materials for power storage devices such as lithium-ion batteries and supercapacitors. First, its performance determines the microscopic interface structure of its electrochemical system, which directly affects the capacity, cycle and safety performance of energy storage devices. Due to the relatively low price of polyolefin and cellulose materials, they are currently widely used in power storage devices such as lithium-ion batteries and supercapacitors. However, the overall performance of the above-mentioned commercial polyolefin separato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01G11/52H01G11/84H01M50/403H01M50/414H01M50/44
CPCH01G11/52H01G11/84H01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 颜亮亮安仲勋华黎李和顺刘永环杜连欢方文英黄廷立
Owner SHANGHAI AOWEI TECH DEV