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Coaxial graphene fiber supercapacitor and manufacturing method thereof

A technology of graphene fibers and supercapacitors, which is applied in the manufacture of hybrid/electric double layer capacitors and electrodes of hybrid capacitors. It can solve the problems of bulky capacitors, bulky capacitors, and limited application range of capacitors, and achieve excellent flexibility.

Inactive Publication Date: 2015-09-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, most of the capacitors on the market currently exist in paper or solid form. The use of liquid electrolyte greatly limits the application range of capacitors, making capacitors relatively bulky and bulky.

Method used

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  • Coaxial graphene fiber supercapacitor and manufacturing method thereof
  • Coaxial graphene fiber supercapacitor and manufacturing method thereof
  • Coaxial graphene fiber supercapacitor and manufacturing method thereof

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preparation example Construction

[0025] The preparation method of above-mentioned coaxial graphene fiber supercapacitor comprises the following steps:

[0026] (1) Dissolving 1 part by weight of graphene oxide in 50-1000 parts by weight of deionized water, and dispersing to obtain a graphene oxide dispersion with a mass fraction of 0.1-2%;

[0027] (2) Extrude the graphene oxide dispersion liquid into the coagulation liquid with a spinning head with a diameter of 100-500 microns to obtain a gel fiber; take out the obtained gel fiber after standing still, and form a single or multiple strands Dry naturally at room temperature (20~30°C) (because drying at high temperature will reduce the effective area of ​​the fiber for charge storage) to obtain graphene oxide fibers with a diameter in the range of 20 to 150 microns;

[0028] (3) Restore the graphene oxide fiber obtained in step 2, soak the reduced fiber in a mixed solvent obtained by mixing ethanol and water at a volume ratio of 1:1 for more than 12 hours, an...

Embodiment 1

[0039] 1) Dissolving 1 part by weight of graphene oxide raw material in 50 parts by weight of deionized water, and treating it in an ultrasonic bath to obtain a 2% mass fraction graphene oxide dispersion;

[0040] 2) Extrude the graphene oxide dispersion liquid into the coagulation liquid with a spinning head with a diameter of 100 microns, take out the obtained gel fiber after standing still, and dry naturally at room temperature in a single form to obtain graphene oxide fibers;

[0041] 4) Place the graphene oxide fiber in a 50% hydroiodic acid aqueous solution by mass fraction, reduce it at 95 degrees Celsius for 12 hours, soak it in a mixed solvent of ethanol and water (volume ratio 1:1) for more than 12 hours, take it out and put it in Dry naturally at room temperature for 24 hours to obtain a graphene fiber as the axis in the coaxial graphene fiber;

[0042] 5) Coat the graphene fiber with an aqueous solution of 20% polyvinyl alcohol by mass fraction, and dry it at room ...

Embodiment 2

[0047] 1) Dissolving 1 part by weight of graphene oxide raw material in 1000 parts by weight of deionized water and treating it in an ultrasonic bath to obtain a 0.1% mass fraction graphene oxide dispersion;

[0048] 2) Extrude the graphene oxide dispersion liquid into the coagulation liquid with a spinning head with a diameter of 500 microns, take out the obtained gel fiber after standing still, and dry naturally at room temperature in the form of multiple strands to obtain graphene oxide fibers;

[0049] 4) Place the graphene oxide fiber in a 50% aqueous solution of hydroiodic acid, reduce it at 95 degrees Celsius for 12 hours, soak it in a mixed solvent of ethanol and water for more than 12 hours, then take it out and dry it naturally at room temperature for 24 hours , to obtain a graphene fiber as the axis in the coaxial graphene fiber;

[0050] 5) Coat the graphene fiber with N,N-dimethylformamide solution with a mass fraction of 30% polyvinylidene fluoride, and dry it at...

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Abstract

The invention discloses a coaxial graphene fiber supercapacitor and a manufacturing method thereof. The method comprises the following steps: 1) dissolving a graphene oxide raw material in deionized water, and then obtaining a graphene oxide dispersion liquid having a mass fraction, 2) extruding the grapheme oxide dispersion liquid into a configured solidification liquid using a spinning head having a certain caliber, and then obtiang a graphene oxide fiber, 4) placing the obtained graphene oxide fiber in reducing environment to perform reduction, and then obtaining a graphene fiber, 5) disposing a layer of a polymer solution on the obtained graphene fiber in a dip-coating manner, and then obtaining the graphene fiber wrapped in polymer gel, 6) disposing a layer of the graphene oxide dispersion liquid on the graphene fiber wrapped in a polymer in a dip-coating manner, and performing drying, 7) placing the fiber in the reducing environment to perform the reduction, and 8) disposing a layer of a polymer electrolyte on the fiber in a dip-coating manner, and performing fully swelling in an electrolyte solution. The method is simple and convenient, and is low in cost, green, environmental-friendly, and suitable for large-scale industrial production; specific capacitance of a capacitor is high, the supercapacitor has good circulation and good toughness and can be used in energy storage, flexible material and other fields.

Description

technical field [0001] The invention relates to a supercapacitor, in particular to a coaxial graphene fiber supercapacitor and a preparation method thereof. Background technique [0002] Supercapacitors, also known as electric double layer capacitors and electrochemical capacitors, are a brand-new capacitor based on the interface electric double layer theory proposed by German physicist Helmholtz, by separating positive and negative charges on the interface to store energy. It is an electrochemical element, and its energy storage process does not undergo irreversible chemical reactions, so it has excellent cycle stability; its energy storage process occurs on the interface, compared with batteries, it is subject to smaller diffusion limitations , thus having a higher power density. Carbon materials are the preferred materials for supercapacitors because of their high specific surface area, high electrical conductivity, and low price. [0003] Graphene was discovered by A....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/36H01G11/24H01G11/26H01G11/84H01G11/86
CPCY02E60/13H01G11/36H01G11/24H01G11/26H01G11/84H01G11/86
Inventor 高超赵晓莉
Owner ZHEJIANG UNIV
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