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Inorganic/organic composite polyimide-based nanofiber membrane and its preparation method and application

A technology for compounding polyimide-based and nanofiber membranes is applied in the directions of fiber processing, fiber chemical characteristics, single-component synthetic polymer rayon, etc. , good heat resistance, high tensile strength

Active Publication Date: 2011-12-14
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The polyimide diaphragm remains dangerous at high temperatures

Method used

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  • Inorganic/organic composite polyimide-based nanofiber membrane and its preparation method and application
  • Inorganic/organic composite polyimide-based nanofiber membrane and its preparation method and application
  • Inorganic/organic composite polyimide-based nanofiber membrane and its preparation method and application

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preparation example Construction

[0035] The preparation method of the present invention is to use electrospinning to nano-spin the polyamic acid hybridized with nano-metal oxides, then use mechanical roller compaction, and finally heat imidize at high temperature to prepare polyimide film .

[0036] The inorganic / organic composite polyimide-based nanofiber membrane of the present invention has excellent chemical stability, high temperature resistance, good permeability and high Tensile Strength. The battery separator obtained in the embodiment of the present invention will not rupture when heated to a high temperature of 350°C; the thermal shrinkage rate of the battery separator at 150°C is less than 0.5%, and the thermal shrinkage rate at 300°C is not greater than 1.5%, which is much smaller than the existing The thermal shrinkage rate of 3% and 5% in the technology, the puncture strength is greater than the puncture strength of the battery separator in the prior art, the surface and internal pores of the m...

Embodiment 1

[0054] 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 milliliter of polyamic acid solution was taken out, and 7.5 milligrams of nano-zirconia (accounting for 5% of the mass fraction of polyamic acid) was slowly added under the condition of stirring until the dispersion was even, and then vacuum degassed and then electrospun, the needle The diameter...

Embodiment 2

[0056] 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-methylacetamide to make the volume to 50 ml, prepare a solution of 0.0050 g / ml, and measure it in a water bath at 30°C with an Ubbelohde viscometer Its intrinsic viscosity is 1.89dL / g. Another 1.0 milliliter of polyamic acid solution was taken out, and 7.5 milligrams of nano-silica (accounting for 5% of the mass fraction of polyamic acid) was slowly added under the condition of stirring until uniform dispersion, and then vacuum degassed and then electrospun, The diameter of the nee...

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Abstract

The invention relates to an inorganic / organic composite polyimide nanometer fibrous film. The inorganic / organic composite polyimide nanometer fibrous film is formed by an inorganic nanoparticle-doped polyimide nanometer fiber, wherein the mass of the inorganic nanoparticles accounts for 0.1-30% of the mass of polyamide acids; the diameter of the polyimide nanometer fiber is 20-500nm, the thickness of the film is 15-100mum, and the air permeability of the film is 10-500s, apertures on the upper surface; and apertures on the upper surface and the lower surface and in the film symmetrically and uniformly distribute, diameters of the apertures are less than 300nm, and the tensile strength of the film is 100-250MPa. According to the invention, a mixed solution of the inorganic nanoparticles and the polyamide acids is subjected to static spinning, machinery rolling, and high temperature imidization to prepare the film, so a preparation method of the film is suitable for large scale preparation. The inorganic / organic composite polyimide nanometer fibrous film can be applied to high capacity energy storage batteries and high power density power lithium ion batteries.

Description

technical field [0001] The invention relates to an inorganic / organic polyimide-based nanofiber membrane. [0002] The present invention also relates to a method for preparing the above-mentioned machine / organic polyimide-based nanofibrous membrane. [0003] The present invention also relates to the application of the above-mentioned machine / organic 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...

Claims

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Application Information

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IPC IPC(8): D01F6/94D01F1/10D01D5/00H01M2/10
CPCY02E60/12Y02E60/10
Inventor 崔光磊刘志宏江文姚建华韩鹏献徐红霞朱玉伟
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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