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Electrostatic spinning-carbonization preparation method of foldable flexible pure nanometer carbon fiber

A carbon nanofiber and electrospinning technology, which is applied in the field of pure carbon nanofiber membrane material and its preparation, can solve the problems of unsatisfactory practical use, unsatisfactory battery electrochemical performance, poor flexibility and mechanical strength of carbon nanofiber, etc., and achieves excellent performance. The effect of flexibility, simple preparation method, and easy reaction conditions

Active Publication Date: 2017-08-22
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the bottleneck problems encountered in the research of flexible electrode materials are mainly reflected in the following two aspects: (1) the flexibility and mechanical strength of carbon nanofibers are not good; (2) the electrochemical performance of batteries has not yet reached the level of traditional lithium-ion batteries , cannot meet the needs of practical use

Method used

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  • Electrostatic spinning-carbonization preparation method of foldable flexible pure nanometer carbon fiber
  • Electrostatic spinning-carbonization preparation method of foldable flexible pure nanometer carbon fiber
  • Electrostatic spinning-carbonization preparation method of foldable flexible pure nanometer carbon fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Use an analytical balance to accurately weigh zinc acetate (Zn(Ac) 2 ) And polyacrylonitrile (PAN) powder (among which Zn(Ac) 2 , PAN mass ratio 0.4:1, and PAN molar mass M = 100000g / mol, mass fraction 8%) placed in a 20ml sample bottle, use a pipette to accurately pipette 10ml of NN dimethylformamide (DMF) , The sample bottle is sealed with raw material tape, heated to 100℃, stirred for 48 hours, and finally a uniform Zn(Ac) is obtained 2 / PAN Electrospinning Solution.

[0036] Electrospinning equipment is used to prepare nanofiber membranes, which are pre-oxidized at 200°C and carbonized at 1000°C to prepare foldable, flexible and pure carbon nanofibers.

[0037] The SEM scanning electron micrograph of the carbon nanofibers prepared in Example 1 is shown in figure 1 , Through SEM scanning electron microscopy combined with energy spectrum analysis found that Example 1: Zn(Ac) 2 , PAN mass ratio 0.4:1, stirring temperature 100 ℃, pre-oxidation temperature 200 ℃, carbonization...

Embodiment 2

[0040] Use an analytical balance to accurately weigh zinc carbonate (ZnCO 3 ) And polyacrylonitrile (PAN) powder (where ZnCO 3 , The mass ratio of PAN is 1:1, and the molar mass of PAN is M=100000g / mol, the mass fraction is 8%) Put it in a 20ml sample bottle, and use a pipette to accurately pipette 10ml of NN dimethylformamide (DMF) , The sample bottle is sealed with raw material tape, heated to 20℃, stirred for 240 hours, and finally a uniform ZnCO 3 / PAN Electrospinning Solution.

[0041] Electrospinning equipment is used to prepare nanofiber membranes, which are pre-oxidized at 240°C and carbonized at 800°C to prepare foldable, flexible and pure carbon nanofibers.

[0042] Cut the nano-carbon fiber obtained in Example 2 into a 5*5cm square, and fold it in half from the center for the first time, and then fold it in half for the second time until it folds in half four times, each time it is recorded by a photo , See Figure 4 The results show that the carbon nanofiber prepared in...

Embodiment 3

[0044] Use an analytical balance to accurately weigh zinc methacrylate and polyacrylonitrile (PAN) powder (the mass ratio of zinc methacrylate to PAN is 0.5:1, and the molar mass of PAN is M = 100000 g / mol, and the mass fraction is 8%). In a 20ml sample bottle, use a pipette to accurately pipette 10ml of NN dimethylformamide (DMF). The sample bottle is sealed with a raw material tape, heated to 60℃, stirred for 96 hours, and finally uniform methacrylic acid is obtained. Zinc / PAN electrospinning solution.

[0045] Electrospinning equipment is used to prepare nanofiber membranes, which are pre-oxidized at 270°C and carbonized at 650°C to prepare foldable flexible pure carbon nanofibers.

[0046] Cut the carbon nanofiber obtained in Example 3 into a 5*5cm square for the first half-folding from the center, and then perform the second half-folding on this basis, until the half-folding four times, each time it is recorded by a photo , See Figure 4 The results show that the carbon nanof...

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Abstract

The invention relates to the field of a flexible energy storage system electrode material, in particular to an electrostatic spinning-carbonization preparation method of foldable flexible pure nanometer carbon fiber. The method comprises the following steps of (1) spinning solution preparation: zinc salt and PAN (polyacrylonitrile) are mixed, and are dissolved in DMF (N,N-Dimethylformamide); after the materials are fully stirred at 0 to 110 DEG C, a uniform spinning solution is obtained, wherein the mass percent of zinc salt in the spinning solution is 1 to 20 percent, and the mass percent of the PAN is 5 to 15 percent; (2) nanofiber preparation: the spinning solution obtained in the first step is spun into a nanofiber membrane by an electrostatic spinning method; (3) flexible nanometer carbon fiber preparation: the nanofiber membrane obtained in the second step is preoxidized for 0.5 to 10h at the temperature of 150 to 280 DEG C; then, carbonization is performed for 1 to 10h at the temperature of 550 to 1600 DEG C under the inert gas protection and the foldable flexible pure nanometer carbon fiber is obtained.

Description

Technical field [0001] The invention relates to the field of electrode materials for flexible energy storage systems, in particular to a multi-foldable pure carbon nanofiber membrane material which can be applied to the negative electrode of a flexible lithium ion battery and a preparation method thereof. Background technique [0002] With the development of society and economy, energy and environmental issues have become increasingly prominent. Therefore, the search for green sustainable energy and the development of energy storage technology equipped with it have attracted much attention. Lithium-ion batteries are widely used in production and life because of their green, safe, and high-capacity advantages. However, the capacity and service life of lithium-ion batteries on the market have not yet reached consumer demand. The recent development of wearable electronic devices puts higher and more special requirements on the use conditions and portability of energy storage device...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22D04H3/007D04H3/03D06C7/04H01M4/66H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/663H01M10/0525D01F9/22D04H3/007D04H3/03D06C7/04B82Y30/00B82Y40/00Y02E60/10
Inventor 胡毅陈仁忠潘鹏何霞吴克识
Owner ZHEJIANG SCI-TECH UNIV
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