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Preparation method for flexible graphite fibre-based asymmetric super capacitor

A supercapacitor and graphene fiber technology, which is applied in the manufacture of hybrid/electric double layer capacitors, can solve the problems of one-dimensional graphene fiber-based flexible asymmetric supercapacitors, and achieve good flexibility and bending stability. High specific capacitance, the effect of expanding the working voltage

Inactive Publication Date: 2014-09-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although asymmetric flexible supercapacitors based on two-dimensional graphene films and three-dimensional graphene aerogels have been reported successively, the preparation of one-dimensional graphene fiber-based flexible asymmetric supercapacitors that are more suitable for flexible and miniaturized devices still remains to be done. is a difficulty

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  • Preparation method for flexible graphite fibre-based asymmetric super capacitor
  • Preparation method for flexible graphite fibre-based asymmetric super capacitor
  • Preparation method for flexible graphite fibre-based asymmetric super capacitor

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preparation example Construction

[0032] The steps of the preparation method of the flexible graphene fiber-based asymmetric supercapacitor are as follows:

[0033] 1) Dissolving the graphene oxide raw material in a solvent to obtain a graphene oxide spinning slurry with a mass percentage of 0.1%-3%;

[0034] The solvent can be any one of deionized water, N-methyl-2-pyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, dimethylsulfoxide, sulfolane or a variety of mixtures in any proportion.

[0035] 2) Pass the graphene oxide spinning slurry obtained in step 1 through a spinning nozzle with a diameter of 10-5000 μm at an extrusion speed of 10-2000 μL / min, stay in a coagulation solution at 5-35°C for 1-3600s, and wash, vacuum drying to obtain graphene oxide fibers;

[0036] The coagulation liquid is a water-based coagulant or an organic coagulant; the solvent of the water-based coagulant is composed of ethanol and water in a volume ratio of 1-9:3, and the solute is calcium chloride or manganese acetate. ...

Embodiment 1

[0056] 1) Dissolve the graphene oxide raw material in deionized water to obtain a mass percentage of 0.1%

[0057] 2) Pass the graphene oxide spinning slurry obtained in step 1 through a spinning nozzle with a diameter of 10 μm at an extrusion speed of 10 μL / min, and stay in the water-based coagulation solution at 35°C for 600 seconds. It is the mixed liquid of ethanol and water of 1:3, and the mass ratio of solute calcium chloride and solvent is 1:100, then washes with detergent, and detergent is made up of ethanol, 80 o C vacuum drying, obtains graphene oxide fiber;

[0058] 3) Place the graphene oxide fiber obtained in step 2 in hydrazine vapor for 90 o C reduced for 1h to obtain graphene fibers;

[0059] 4) Soak the graphene fibers obtained in step 3 in an aqueous solution of potassium permanganate with a concentration of 0.1g / L and a temperature of 5°C, react for 24 hours, take out and wash, 80 o C is vacuum-dried to obtain the graphene fiber modified by manganese diox...

Embodiment 2

[0066] 1) Dissolving the graphene oxide raw material in deionized water to obtain a graphene oxide spinning slurry with a mass percentage of 3%;

[0067] 2) Pass the graphene oxide spinning slurry obtained in step 1 through a spinning nozzle with a diameter of 5000 μm at an extrusion speed of 2000 μL / min, and stay in an organic coagulation solution at 5 °C for 300 seconds, and the organic coagulation solution is composed of acetone as a solvent , then 60 o C vacuum drying, obtains graphene oxide fiber;

[0068] 3) Place the graphene oxide fibers obtained in step 2 in 50% sodium ascorbate aqueous solution at 85°C to obtain graphene fibers;

[0069] 4) Soak the graphene fibers obtained in step 3 in an aqueous potassium permanganate solution with a concentration of 1g / L and a temperature of 70°C, react for 10 minutes, remove and wash, and dry in vacuum at 80°C to obtain manganese dioxide-modified graphene fibers ;

[0070] 5) Dissolve graphene oxide and carboxylated multi-wall...

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Abstract

The invention discloses a preparation method for a flexible graphite fibre-based asymmetric super capacitor. The preparation method comprises the following steps of: obtaining manganese dioxide-modified graphite fibres through wet spinning, reduction and reaction with potassium permanganate solution; obtaining graphite / carbon nano-tube composite fibres through wet spinning and reduction; finally the both ends of each of one manganese dioxide-modified graphite fibre and one graphite / carbon nano-tube composite fibre with the same length and diameter on a base and a conductive current collector respectively, and coating a gel electrolyte on the surfaces to obtain the flexible graphite fibre-based asymmetric super capacitor. The preparation method disclosed by the invention is simple and convenient to operate, low in cost, suitable for large-scale production, and capable of expanding the working window of the super capacitor while ensuring the high specific capacitance of the super capacitor, thus greatly increasing the energy density of the super capacitor; in addition, the fibres based on graphite are good in flexibility, and capable of being used for the field of high-energy flexible energy storage materials and devices.

Description

technical field [0001] The invention relates to a method for preparing a flexible graphene fiber-based asymmetric supercapacitor. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, have become another important energy storage method due to their ultra-high power density and cycle stability. However, due to the low energy density, the current commercialized supercapacitors can still only play a role in the field of fast charging and discharging as a powerful supplement to batteries. How to improve the energy density of supercapacitors has always been an important topic in the field of energy storage. According to the formula: E = 1 / 2 cv 2 It can be seen that the capacitance value and the working voltage are two factors that determine the energy density of the capacitor. Improving the specific capacitance of supercapacitors is currently the most common way to increase their energy density. Recently, increasing the energy density of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/84
CPCY02E60/13
Inventor 高超郑冰娜
Owner ZHEJIANG UNIV
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