Coaxial compound nanometre fibre film as well as preparation method and application thereof

A technology of composite nanofibers and nanofibers, which can be used in fiber processing, conjugated synthetic polymer rayon, textiles and papermaking, etc., can solve problems such as unfavorable batch preparation, cumbersome steps, etc., and achieve excellent chemical stability and uniform distribution. , the effect of excellent air permeability

Active Publication Date: 2011-11-02
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 diaphragms are all asymmetric membranes, and pore-forming agents are required for preparation, and the steps are cumbersome, which is not conducive to batch preparation

Method used

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  • Coaxial compound nanometre fibre film as well as preparation method and application thereof
  • Coaxial compound nanometre fibre film as well as preparation method and application thereof
  • Coaxial compound nanometre fibre film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 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 1.66g of polyamic acid solution in a 50ml volumetric flask, add N,N-dimethylacetamide to make the volume to 50ml, prepare a solution of 0.0050g / ml, and use an Ubbelohde viscometer in a water bath at 30°C Its intrinsic viscosity was determined to be 2.11dL / g. Take out 1.0 milliliter polyamic acid solution as inner fluid, 1.0 milliliter vinylidene fluoride-hexafluoropropylene copolymer solution (mass fraction is 15%, solvent is N, N-dimethylformamide) as outer fluid, carries out coaxial electrostatic For spinning, the inner diameter of the needle is 1.0 mm, the thickn...

Embodiment 2

[0051] 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. Take out 1.0 milliliter polyamic acid solution as the inner fluid, 1.0 milliliter polyvinylidene fluoride solution (mass fraction is 15%, solvent is N, N-dimethylformamide) as the outer fluid, carry out coaxial electrospinning, needle The diameter of the lumen is 1.0 mm, the thickness of the ou...

Embodiment 3

[0053] 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. Take out 1.0 ml of polyamic acid solution as the inner fluid, and 1.0 ml of vinylidene fluoride-chlorotrifluoroethylene copolymer solution (the mass fraction is 15%, the solvent is N, N-dimethylacetamide) as the outer fluid, and carry out coaxial Electrospinning, the diameter of the inner cav...

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Abstract

The invention discloses a coaxial compound nanometre fibre film composed of compound nanometre fibres of a fluorine-containing polymer skin layer and a polyimide core layer, wherein the upper and the lower surfaces and inner holes of the film are distributed symmetrically. The coaxial compound nanometre fibre film is prepared from a fluorine-containing polymer solution and a polyamic acid solution through coaxial static spinning compounding, mechanical roller pressing and thermal imidization; the nanometre fibre film provided by the invention integrates the advantages of fluorine-containing polymer and polyimide; the fluorine-containing polymer has excellent electrolyte wetting property, liquid maintaining property and ion conductivity; and the polyimide has high mechanical strength and high heat resistance. The compound nanometre film provided by the invention is fit for high-energy lithium ion energy storage batteries and high-power electrokinetic cells.

Description

technical field [0001] The invention relates to a coaxial composite nanofiber membrane for a lithium ion secondary battery. [0002] The present invention also relates to the preparation method of the coaxial composite nanofiber membrane. [0003] The present invention also relates to the application of the coaxial composite 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/72D01D5/00D01D5/30D01F8/10D01F8/16H01M2/16
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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