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Polyimide-base nano fibrous membrane, and preparation method and application thereof

A nanofiber membrane, polyimide-based technology, used in fiber processing, fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of danger of polyimide diaphragms, and achieve convenient preparation, uniform pore structure and distribution. , the effect of high heat resistance

Active Publication Date: 2011-11-23
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polyimide diaphragm remains dangerous at high temperatures

Method used

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  • Polyimide-base nano fibrous membrane, and preparation method and application thereof
  • Polyimide-base nano fibrous membrane, and preparation method and application thereof
  • Polyimide-base nano fibrous membrane, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Add 4.36 grams of pyromellitic dianhydride, 4.00 grams of diaminodiphenyl ether, and 45.5 milliliters of N,N-dimethylacetamide into a 150 milliliter four-neck flask, and then stir the reaction in an ice bath at 0-5°C , the reaction time was 24 hours to obtain a uniform polyamic acid solution (15% by mass fraction). After the reaction, the polyamic acid solution was stored in a refrigerator at 4°C. Take out 1.6667 g of polyamic acid solution in a 50 ml volumetric flask, add N,N-dimethylacetamide to make it volume to 50 ml, prepare a solution of 0.0050 g / ml, and use an Ubbelohde viscometer in a water bath at 30°C Its intrinsic viscosity was determined to be 2.11dL / g. Another 1.0 ml of polyamic acid solution was taken out for electrospinning, the diameter of the needle was 1.6 mm, the spinning voltage was 100 volts, the height from the needle tip to the receiving plate was 20 cm, and the electrospinning was performed for 2 hours to obtain a polyamide with a thickness of 9...

Embodiment 2

[0050] Add 5.88 grams of biphenyltetracarboxylic dianhydride, 4.97 grams of diphenylsulfone diamine, and 60.3 milliliters of N,N-dimethylacetamide into a 150 milliliter four-neck flask, and then stir the reaction in an ice bath at 0-5°C , the reaction time was 24 hours to obtain a uniform polyamic acid solution (15% by mass fraction). After the reaction, the polyamic acid solution was stored in a refrigerator at 4°C. Take out 1.6667 g of polyamic acid solution in a 50 ml volumetric flask, add N,N-dimethylacetamide to make it volume to 50 ml, prepare a solution of 0.0050 g / ml, and use an Ubbelohde viscometer in a water bath at 30°C Its intrinsic viscosity was determined to be 1.89dL / g. Another 1.0 ml of polyamic acid solution was taken out for electrospinning, the diameter of the needle was 1.6 mm, the spinning voltage was 2 kV, the height from the needle tip to the receiving plate was 20 cm, and the electrospinning was performed for 2 hours to obtain a nanometer with a thickn...

Embodiment 3

[0052] Add 5.88 grams of biphenyltetracarboxylic dianhydride, 2.16 grams of p-phenylenediamine, and 43.4 milliliters of N,N-dimethylacetamide into a 150 milliliter four-neck flask, and then stir the reaction in an ice bath at 0-5°C. The reaction time was 24 hours, and a uniform polyamic acid solution (15% by mass fraction) was obtained. After the reaction, the polyamic acid solution was stored in a refrigerator at 4°C. Take out 1.6667 g of polyamic acid solution in a 50 ml volumetric flask, add N,N-dimethylacetamide to make it volume to 50 ml, prepare a solution of 0.0050 g / ml, and use an Ubbelohde viscometer in a water bath at 30°C Its intrinsic viscosity was determined to be 1.49dL / g. Another 1.0 ml of polyamic acid solution was taken out for electrospinning, the diameter of the needle was 1.6 mm, the spinning voltage was 25.0 kV, the height from the needle tip to the receiving plate was 20 cm, and the electrospinning was performed for 2 hours to obtain a nanometer with a t...

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Abstract

The invention discloses a polyimide-base nano fibrous membrane which can be used as a lithium ion secondary battery membrane. The polyimide-base nano fibrous membrane is composed of polyimide nano fibers of which the diameters are 20-500 nanometers, the membrane thickness is 15-100 micrometers, and the air penetrability of the membrane is 10-500 seconds; and the pore distribution of the upper andlower surfaces and the inside is symmetrical and uniform, the average pore size is 100 nanometers, and the tensile strength is 100-250mpa. The invention also discloses a preparation method of the polyimide-base nano fibrous membrane. When being used as the lithium ion battery membrane, the polyimide-base nano fibrous membrane has favorable heat resistance, and can not produce the phenomenon of short circuit even at 150 DEG C; and therefore, the battery membrane disclosed by the invention is especially suitable for high-capacity and high-power lithium ion batteries.

Description

technical field [0001] The invention relates to a polyimide-based nanofiber membrane. [0002] The present invention also relates to a preparation method of the above-mentioned polyimide-based nanofiber membrane. [0003] The present invention also relates to the application of the polyimide-based nanofiber membrane in lithium ion secondary batteries. Background technique [0004] Lithium-ion secondary batteries have achieved great development in the past ten years due to their advantages of high specific capacity, high voltage, small size, light weight, and no memory. However, for lithium-ion secondary batteries using liquid electrolytes, in Sometimes, lithium-ion batteries are prone to safety hazards such as smoke, fire, explosion, and even personal injury, which makes high-capacity and power lithium-ion batteries not widely used. Therefore, improving the safety performance of lithium-ion batteries is the key to developing lithium-ion secondary batteries. The key to the ...

Claims

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Application Information

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IPC IPC(8): D01F6/74D01D5/00C08G73/10H01M2/16
CPCY02E60/12Y02E60/10
Inventor 崔光磊刘志宏江文姚建华韩鹏献徐红霞
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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