Porous graphene fiber nonwoven fabric and preparation method thereof

A graphene fiber and porous graphene technology, which is applied in graphene, fiber raw material processing, synthetic cellulose/non-cellulose material pulp/paper, etc., can solve the problems of restricting the performance of non-woven electrodes and low electrochemical activity , to achieve the effect of simple preparation method and wide application prospect

Inactive Publication Date: 2019-01-29
HANGZHOU GAOXI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphene fiber non-woven fabrics are lapped by flexible graphene fibers into a network structure, which ensures the demand for flexibility; on the other hand, due to the dense fiber structure of conventional graphene fiber non-woven fabrics, the electrochemical activity Low, restricting the electrode performance of non-woven fabrics

Method used

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  • Porous graphene fiber nonwoven 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 was used as the spinning solution, and the calcium chloride / water / ethanol mixture (mass ratio 20:300:100) was used as the 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 80° C. for 3 hours.

[0027] (3) Using a high-speed shear mixer to crush the dried graphene oxide fibers in deionized water to obtain a swollen graphene oxide short fiber dispersion.

[0028] (4) Deposit the graphene oxide gel short fibers on the filter screen by using a vacuum filtration device, and keep the suction filtration for 10 minutes after the surface solvent is drained.

[0029] (5) Use liquid nitrogen to freeze the graphene oxide fiber filter cake and freeze-dry to obtain a porous graphene oxide fiber nonwoven fabric.

[0030] (6) Reducing the dried graphene oxide fiber non-woven fabric with h...

Embodiment 2

[0033] (1) The graphene oxide / N, N-dimethylformamide solution with a concentration of 5 mg / mL was used as the spinning solution, and ethyl acetate was used as the coagulation bath for continuous wet spinning.

[0034] (2) The obtained graphene oxide fiber was placed at room temperature for 14 hours, and then vacuum-dried at 60° C. for 3 hours.

[0035] (3) Using a high-speed shear mixer to crush the dried graphene oxide fibers in deionized water to obtain a swollen graphene oxide short fiber dispersion.

[0036] (4) Utilize the vacuum filtration device to deposit the graphene oxide gel short fibers on the filter screen, and keep the suction filtration for 15 minutes after the surface solvent is drained.

[0037] (5) Use liquid nitrogen to freeze the graphene oxide fiber filter cake and freeze-dry to obtain a porous graphene oxide fiber nonwoven fabric.

[0038] (6) The dried graphene oxide fiber non-woven fabric is thermally reduced at 800°C.

[0039] After the above steps, ...

Embodiment 3

[0041] (1) The graphene oxide / N, N-dimethylformamide solution with a concentration of 15 mg / mL was used as the spinning solution, and ethyl acetate was used as the coagulation bath for continuous wet spinning.

[0042] (2) The obtained graphene oxide fiber was placed at room temperature for 12 hours, and then vacuum-dried at 100° C. for 3 hours.

[0043] (3) Using a high-speed shear mixer to crush the dried graphene oxide fibers in deionized water to obtain a swollen graphene oxide short fiber dispersion.

[0044] (4) Utilize the vacuum filtration device to deposit the graphene oxide gel short fibers on the filter screen, and keep the suction filtration for 50 minutes after the surface solvent is drained.

[0045] (5) Use liquid nitrogen to freeze the graphene oxide fiber filter cake and freeze-dry it.

[0046] After the above steps, the obtained graphene fiber non-woven fabric has less porous structure and a specific surface area of ​​83m 2 / g.

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Abstract

The invention discloses a porous graphene fiber non-woven fabric and a preparation method thereof. According to the invention, a large number of micropores are contained in the interior and on the surface of the graphene fibers which constitute a non-woven fabric, and a multi-stage pore channel structure composed of macropores and micropores is formed in the non-woven fabric, so the specific surface area of a novel graphene fiber nonwoven fabric is significantly increased; meanwhile, a mutually-overlapped flexible network framework can be formed through strong interactions among fibers, so theporous graphene fiber non-woven fabric provided by the invention has broad application prospects in the fields of adsorption, catalysis and energy-storage electrode materials, etc.

Description

technical field [0001] The invention relates to graphene fibers and fabrics, in particular to a porous graphene fiber non-woven fabric and a preparation method thereof. Background technique [0002] Graphene fiber non-woven fabric is a fiber assembly with a network structure assembled by graphene fibers relying on the self-fusion effect between fibers (Nature Communications, 2016, 13684). Due to the good mechanical and electrical properties of the graphene fiber itself, and the strong interaction of the fibers after fusion, the contact resistance is low, so the graphene fiber non-woven fabric has excellent mechanical stability, flexibility, and electrical conductivity. It is a potential high-performance electrode material and has broad application prospects in the field of flexible energy storage devices. [0003] As an electrode material for flexible devices, in addition to having electrical conductivity, it also needs to meet two conditions, one is flexibility, and the ot...

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): D21H13/50D21J5/00C01B32/184
CPCC01B32/184D21H13/50D21J5/00
Inventor 高超李拯
Owner HANGZHOU GAOXI TECH CO LTD
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