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Method for preparing polyvinylidene fluoride (PVDF) porous nanofiber membrane with high ion migration number

A technology of ion transfer number and nanofiber membrane, which is applied in fiber processing, fiber chemical characteristics, rayon manufacturing, etc., can solve the problems of increasing the tortuosity of the fiber membrane aperture, increasing the internal resistance of the battery, and overheating the battery to achieve good electrochemical performance. The effects of stability, prolonging service life, and reducing the rate of increase in internal resistance

Inactive Publication Date: 2011-12-07
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese published patent CN101069822 has prepared polyvinylidene fluoride fiber membrane by electrospinning and hot pressing technology, wherein the continuous heat-sealing and gluing process will seriously affect the pore size and pore size distribution of the polyvinylidene fluoride fiber membrane, greatly increasing the Pore ​​tortuosity, using it as a battery separator will greatly increase the internal resistance of the battery, causing the battery to overheat and even explode

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] At room temperature at 25°C, add 0.05g of SWCNT and 0.05g of lithium chloride to 47.4g of a mixed solvent of N-N-dimethylacetamide / acetone (mass ratio: 1:1), and in 40Hz ultrasonic frequency Treat for 1 h; then, take 4 g polyvinylidene fluoride at 100 o C under vacuum for 24 h, then take 2 g of dried polyvinylidene fluoride and add it to the mixture of SWCNT / lithium chloride / N-N-dimethylacetamide / acetone, put it on a magnetic stirrer at 80 o Under the condition of 100 rpm, stir and dissolve until a homogeneous solution is obtained; finally, at room temperature 25 o Under the condition of C, 0.5 g polyvinylpyrrolidone was added to the above solution, placed on a magnetic stirrer and stirred at a speed of 120 rpm, and finally a polyvinylidene fluoride / polyvinylpyrrolidone electrospinning solution with a mass fraction of 5% was obtained.

[0020] at room temperature 25 o C. Under the condition of 20% humidity, the polyvinylidene fluoride / polyvinylpyrrolidone spinning sol...

Embodiment 2

[0023] at room temperature 25 o Under the condition of C, add 0.1 g SWCNT and 0.05 g lithium perchlorate to 45.85 g of N-N-dimethylacetamide / dimethyl sulfoxide (mass ratio 1:1) mixed solvent, and ultrasonicate at 40Hz Frequency treatment for 1 h; take 6 g polyvinylidene fluoride at 100 o Vacuum dry at C for 24 h, then take 3.5 g of dried polyvinylidene fluoride and add it to a mixture of SWCNT / lithium perchlorate / N-N-dimethylacetamide / dimethyl sulfoxide and place it on a magnetic stirrer on 80 o Under the condition of 55 rpm, stir and dissolve until a homogeneous solution is obtained; finally, at room temperature 25 o Under the condition of C, 0.5 g of polyvinylpyrrolidone was added to the above solution, placed on a magnetic stirrer and stirred at a speed of 120 rpm, and finally a polyvinylidene fluoride / polyvinylpyrrolidone electrospinning solution with a mass fraction of 13% was obtained.

[0024] at room temperature 25 o C. Under the condition of 30% humidity, the poly...

Embodiment 3

[0027] at room temperature 25 o Under the condition of C, 0.05 g SWCNT and 0.05 g lithium phosphate were added to a mixed solvent of 43.9 g N-methylpyrrolidone / dimethyl sulfoxide (mass ratio 1:2), and treated at 40Hz ultrasonic frequency for 2 h ; Take 7 g polyvinylidene fluoride at 100 o C under vacuum for 24 h, then take 5 g of dried polyvinylidene fluoride and add it to the mixture of SWCNT / lithium phosphate / N-methylpyrrolidone / dimethyl sulfoxide, put it on a magnetic stirrer at 80 o Under the condition of C, stir and dissolve at a speed of 120 rpm until a homogeneous solution is obtained. Finally, at room temperature 25 o Under the condition of C, 1 g of polyvinylpyrrolidone was added to the above solution, and placed on a magnetic stirrer to stir at a speed of 120 rpm to obtain a polyvinylidene fluoride / polyvinylpyrrolidone electrospinning solution with a mass fraction of 12%.

[0028] at room temperature 25 o C. Under the condition of 28% humidity, the polyvinyliden...

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Abstract

The invention relates to a method for preparing a polyvinylidene fluoride (PVDF) porous nanofiber membrane with a high ion migration number. The method is characterized by comprising the following steps of: 1, adding a single-walled carbon nanotube and lithium salts into an organic solvent to form a mixed solution; adding polyvinylidene fluoride, heating, stirring and dissolving, cooling to the room temperature, adding polyvinyl pyrrolidone, stirring and dissolving to obtain a spinning solution; and 2, performing electrostatic spinning on the obtained spinning solution to obtain a fiber membrane; impregnating the obtained fiber membrane in ethanol for 1-2 hours to obtain the PVDF porous nanofiber membrane with the high ion migration number. The PVDF porous nanofiber membrane prepared with the method is used as a lithium ion battery isolation membrane, and maintains good mechanical strength at the same time of maintaining high lithium ion migration number, high liquid absorption rate and good electrochemical stability in a range of from 20 to 70 DEG C.

Description

technical field [0001] The invention relates to a preparation method of a PVDF porous nanofiber membrane with high ion transfer number, belonging to the field of nano functional materials. Background technique [0002] Lithium-ion batteries are mainly composed of three parts: positive and negative electrodes, separator and electrolyte. Among them, the separator connects and separates the positive and negative electrode materials, and its performance determines the interface structure and internal resistance of the battery, which in turn affects the key characteristics of the battery such as capacity, cycleability, and charge-discharge current density. Therefore, the performance of the separator It has an important impact on the comprehensive performance of lithium-ion batteries. [0003] Polyvinylidene fluoride (PVDF) is a common polymer electrolyte. It has good chemical corrosion resistance, oxidation resistance, and weather resistance. It also has special properties such...

Claims

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Application Information

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IPC IPC(8): D04H1/72D01D5/00D01F6/48D01F1/10H01M2/16
CPCY02E60/12Y02E60/10
Inventor 丁彬王娜斯阳俞建勇
Owner DONGHUA UNIV
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