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Nitrogen-doped graphene fiber non-woven fabric and preparation method thereof

A technology of graphene fibers and non-woven fabrics, which is applied in the fields of fiber chemical characteristics, non-woven fabrics, textiles and papermaking, etc. It can solve problems that have not been reported, poor affinity of aqueous electrolytes, electrochemical activity limitations, etc., and achieve wide application Prospect, simple preparation method, effect of improving conductivity

Inactive Publication Date: 2019-02-19
HANGZHOU GAOXI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when the graphene fiber non-woven fabric is used as an electrode material, in order to ensure high electrical conductivity and mechanical stability, the structure of its constituent graphene fibers is relatively dense, the functional groups of the graphene sheets are less, and the fiber skeleton has a relatively dense structure. Due to the lack of active sites, the affinity with aqueous electrolytes is poor, and the electrochemical activity of nonwoven electrodes is also limited to a certain extent, which restricts the improvement of the performance of electrochemical devices using graphene fiber nonwovens as electrodes.
Doping carbon materials with nitrogen atoms is a common method to improve their hydrophilicity and electrochemical activity. At present, the preparation of nitrogen-doped graphene oxide fiber non-woven fabrics has not been reported.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Nitrogen-doped graphene fiber non-woven fabric and preparation method thereof
  • Nitrogen-doped graphene fiber non-woven fabric and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) The graphene oxide / water solution with a concentration of 5 mg / mL is used as the spinning solution, wherein 10% of the mass fraction of polyvinylpyrrolidone is added, and the mixed solution of calcium chloride / water / ethanol (mass ratio 20:300:100) is coagulation bath for continuous wet spinning.

[0026] (2) The obtained graphene oxide fibers were left at room temperature for 12 hours, and then vacuum-dried at a temperature of 100° C. for 3 hours.

[0027] (3) Disperse the dried composite fibers in an ethanol solution, and grind them with a high-speed shear mixer to obtain a dispersion of short fibers.

[0028] (4) Deposit composite short fibers on the filter, and vacuum filter to dryness to obtain graphene oxide / polyvinylpyrrolidone composite fiber non-woven fabric.

[0029] (5) Carrying out heat treatment at 1000° C. to the prepared composite fiber nonwoven fabric to obtain nitrogen-doped graphene fiber nonwoven fabric.

[0030] figure 1 a is the surface morpho...

Embodiment 2

[0032] (1) Graphene oxide / N with a concentration of 5 mg / mL, N-dimethylformamide solution is used as spinning solution, wherein 10% urea is added by mass fraction, and ethyl acetate is used as coagulation bath for continuous wet spinning .

[0033] (2) The obtained graphene oxide fiber was placed at room temperature for 14 hours, and then vacuum-dried at 100° C. for 3 hours.

[0034] (3) Disperse the dried composite fibers in an ethanol solution, and grind them with a high-speed shear mixer to obtain a dispersion of short fibers.

[0035] (4) Deposit composite short fibers on the filter screen, and vacuum filter to dryness to obtain graphene oxide / urea composite fiber nonwoven fabric.

[0036] (5) Carry out heat treatment at 800° C. to the prepared composite fiber non-woven fabric to obtain nitrogen-doped graphene fiber non-woven fabric.

[0037] After the above steps, the nitrogen content of the obtained graphene fiber non-woven fabric is about 6%, and the capacitance value...

Embodiment 3

[0039] Steps 1-5 are the same as in Example 2, the polymer added to the spinning solution is melamine with a mass fraction of 5%, and the final heat treatment temperature is 1000°C. The nitrogen content of the obtained graphene fiber nonwoven fabric is about 3%.

[0040] The capacitance value of this graphene fiber nonwoven electrode is 184F / g (0.1A / g).

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Abstract

The invention discloses nitrogen-doped graphene fiber non-woven fabric and a preparation method thereof. A graphene slice layer forming graphene fiber contains a certain number of doped nitrogen heteroatoms, and the nitrogen-doped graphene fiber non-woven fabric can be obtained through self-fusion of the graphene fiber. The nitrogen-doped graphene fiber non-woven fabric and the preparation methodthereof have the advantages that the improvement of the hydrophilia, electrical conductivity and electrochemical activity of the graphene fiber and non-woven fabric structure are facilitated, and therefore, the nitrogen-doped graphene fiber non-woven fabric is a high-performance electrode material used for an aqueous electrolyte system energy storage device.

Description

technical field [0001] The invention relates to graphene fibers and fabrics, in particular to a graphene fiber non-woven fabric doped with nitrogen atoms and a preparation method thereof. Background technique [0002] Graphene fiber non-woven fabric is a new type of carbon-based fabric (Nature Communications, 2016, 13684) in which graphene fibers are fused at fiber lap joints. Strong, and significantly reduce the contact resistance between fibers, so this non-woven material has good structural stability, flexibility, and excellent electrical and thermal conductivity, and is a potential high-performance electrode material, which can be used In the field of energy storage devices such as supercapacitors and batteries, especially in flexible electronic devices, it has shown great application prospects. [0003] However, when the graphene fiber non-woven fabric is used as an electrode material, in order to ensure high electrical conductivity and mechanical stability, the struct...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/4242D01F9/12D01F1/10
CPCD01F1/10D01F9/12D04H1/4242
Inventor 高超李拯
Owner HANGZHOU GAOXI TECH CO LTD
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