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A novel fluorine-containing polyimide nanofiber membrane and its preparation method and application

A nanofiber membrane and polyimide technology, which is applied in fiber treatment, spinning solution preparation, filament/wire forming, etc., can solve the problem of low porosity and cannot meet the rapid charge and discharge of lithium-ion batteries Trends and requirements and other issues, to achieve outstanding heat resistance, improve wettability and liquid retention rate, and solve the effects of poor heat resistance

Active Publication Date: 2016-06-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patents all have the disadvantage of low porosity (40-50%), which cannot well meet the trend and requirements of rapid charging and discharging of lithium-ion batteries.

Method used

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  • A novel fluorine-containing polyimide nanofiber membrane and its preparation method and application
  • A novel fluorine-containing polyimide nanofiber membrane and its preparation method and application
  • A novel fluorine-containing polyimide nanofiber membrane and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]Add 1.5511g of 4,4'-diphenyl ether dianhydride, 1.3413g of 2-trifluoromethyl-4,4'-diaminodiphenyl ether and 17.5ml of N,N-dimethylacetamide into a 100ml three-necked flask, Stir and react at -5°C for 10 hours to obtain a uniform polyamic acid solution (15wt%), which is stored in a refrigerator (4°C); take 1.6667g of polyamic acid solution in a 50ml volumetric flask, add N,N-dimethyl Dilute acetamide to the mark, prepare a solution containing 0.0050 g / ml of polyamic acid, and use an Ubbelohde viscometer (Shanghai Dibo Experimental Equipment Co., Ltd., model: D01002-075; the same below.) to measure in a water bath at 30 °C Its intrinsic viscosity is 1.2dL / g; take 1ml polyamic acid solution (15wt%) and place it in the electrospinning device as the spinning stock solution (the electrospinning device is such as Figure 4 As shown, it includes three main parts of high-voltage power supply, fiber receiving device and spinneret, wherein the high-voltage power supply is a DC powe...

Embodiment 2

[0046] Add 1.5511g of 4,4'-diphenyl ether dianhydride, 1.3413g of 5-trifluoromethyl-4,4'-diaminodiphenyl ether and 9.26ml of N,N-dimethylacetamide into a 100ml three-necked flask, Stir and react at 25°C for 24h to obtain a homogeneous polyamic acid solution (25wt%), which is stored in a refrigerator (4°C); take 1g of polyamic acid solution in a 50ml volumetric flask, add N,N-dimethylacetamide Set the volume to the scale, prepare a solution containing 0.0050g / ml polyamic acid, and use an Ubbelohde viscometer to measure its intrinsic viscosity in a 30°C water bath to be 1.08dL / g; take 1ml polyamic acid solution (25wt%) as the spinning The silk stock solution was placed on an electrospinning device, and electrospun at 30°C and a relative humidity of 90%rh to obtain a polyamic acid nanofiber film; the polyamic acid nanofiber film was vacuum-dried at 150°C for 2 hours and then heated to 200 Thermal imidization at ℃ for 2 hours to obtain a polyimide nanofiber membrane; the spinning ...

Embodiment 3

[0052] Add 1.0906g of pyromellitic anhydride, 1.3413g of 2-trifluoromethyl-4,4'-diaminodiphenyl ether and 17.5ml of N,N-dimethylacetamide into a 100ml three-necked flask, and stir the reaction at 15°C After 18 hours, a homogeneous polyamic acid solution (15wt%) was obtained and stored in a refrigerator (4°C); 1.6667g of polyamic acid solution was taken in a 50ml volumetric flask, and N,N-dimethylacetamide was added to dilute to Scale, prepared into a solution containing 0.0050g / ml polyamic acid, using Ubbelohde viscometer to measure its intrinsic viscosity in a 30°C water bath to 1.1dL / g; take 1ml polyamic acid solution (15wt%) as spinning stock solution Electrospinning was carried out on an electrospinning device at 25°C and a relative humidity of 70%rh to obtain a polyamic acid nanofiber film; the polyamic acid nanofiber film was vacuum-dried at 120°C for 4 hours and then heated to 240°C for hot sub- Aminated for 4 hours to obtain a polyimide nanofiber membrane; the spinning...

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Abstract

The invention discloses a novel fluorine-contained polyimide (PI) nanofiber membrane, as well as a preparation method and application thereof. Polyimide containing trifluoromethyl groups is dissolved in N,N-dimethyl acetamide to prepare 5-25 wt% of spinning solution for preparing the fluorine-contained polyimide nanofiber membrane. As polyimide containing trifluoromethyl groups is adopted to prepare the fluorine-contained polyimide nanofiber membrane, the defect of poor heat resistance of polyolefin is well overcome; and due to the introduction of trifluoromethyl, the electrolyte solution wettability and the solution retention ratio of a diaphragm can be improved, and indissolvable polyimide is enabled to be dissolvable, so as to facilitate forming in the later period. The prepared nanofiber membrane has the advantage of large specific surface area, and the porosity is about 80% and is far higher than that (40-50%) of a PE / PP diaphragm on the market, so that lithium ions can pass through the diaphragm more easily to realize fast charging and discharging, so as to well meet the requirement for fast charging and discharging of lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of nanofiber membranes, in particular to a novel fluorine-containing polyimide nanofiber membrane and its preparation method and application. Background technique [0002] Lithium-ion batteries appeared in the late 1980s and are widely used in portable electronic products such as mobile phones, notebook computers, and digital cameras, and the market demand is growing at an alarming rate. At the same time, countries are scrambling to develop the electric vehicle industry, and the research and development of power batteries is in full swing. With its excellent comprehensive performance, lithium-ion batteries have become one of the preferred high-energy power batteries in the electric vehicle industry. In addition, lithium-ion batteries also have broad application prospects in space technology and defense industry. [0003] The usual lithium-ion battery is composed of five parts: positive electrode material, n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/4334D04H1/728D01D5/00D01D1/02H01M2/16
CPCY02E60/10
Inventor 邱志明严玉蓉汪洋冯涛
Owner SOUTH CHINA UNIV OF TECH
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