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Graphene for electrical double-layer capacitor and preparation method thereof

A supercapacitor battery and graphene technology, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, etc., can solve the problems of low specific surface area utilization rate, poor conductivity, and inability to effectively form an electric double layer, and achieve low cost. , Improve the specific capacitance value, improve the stability and purity of the crystal structure

Inactive Publication Date: 2014-09-17
DAYING JUNENG TECH & DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when carbon materials are used as capacitor electrode materials, the specific surface area utilization rate is low, because they contain a large number of micropores, and these micropores with a diameter of less than 2nm cannot effectively form an electric double layer.
In addition, carbon materials also have the problem of poor conductivity as capacitor electrode materials.

Method used

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  • Graphene for electrical double-layer capacitor and preparation method thereof
  • Graphene for electrical double-layer capacitor and preparation method thereof
  • Graphene for electrical double-layer capacitor and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0031] Weigh 5.0g flake graphite, 2.5g potassium nitrate, 15.0g potassium permanganate and mix them evenly, place them in a special reaction kettle, then add 115mL of concentrated sulfuric acid, react at a low temperature of 4°C for 24h, at a medium temperature of 40°C for 4h, at a high temperature of 90°C Three stages of reaction 30min. Then add 75mL of hydrogen peroxide into the above reaction device, after fully reacting, pickling, water washing and drying to obtain graphite oxide. The graphene product of the present invention is obtained after graphite oxide is expanded and reduced in air at 450° C. for 30 minutes. The specific surface area of ​​the prepared graphene is about 456m 2 / g. Mix the above-mentioned graphene with binder and conductive carbon black evenly (the mass ratio of each component is 90:5:5), coat it on the nickel foam, dry it, and cut it into a disc with a diameter of 1.0cm, as the sample to be tested. Electrodes are used where the active material loa...

example 2

[0033]Weigh 20.0g of graphite flakes, 10.0g of potassium nitrate, and 60.0g of potassium permanganate and mix them evenly, place them in a special reaction kettle, then add 460mL of concentrated sulfuric acid, and undergo a reaction at a low temperature of 4°C for 24 hours, a medium temperature of 40°C for 4 hours, and a high temperature of 90°C Three stages of reaction 30min. Then add 300mL of hydrogen peroxide into the above reaction device, after fully reacting, pickling, washing with water, and drying to obtain graphite oxide. The graphite oxide is expanded and reduced in air at 300° C. for 30 minutes to obtain the graphene product of the present invention. The specific surface area of ​​the prepared graphene is about 440m 2 / g. Mix the above-mentioned graphene with binder and conductive carbon black evenly (the mass ratio of each component is 90:5:5), coat it on the nickel foam, dry it, and cut it into a disc with a diameter of 1.0cm, as the sample to be tested. Electr...

example 3

[0035] Weigh 150.0g flake graphite, 75.0g potassium nitrate, 450.0g potassium permanganate and mix them evenly, put them in a special reaction kettle, then add 3450mL concentrated sulfuric acid, react at low temperature 4°C for 24h, medium temperature at 40°C for 4h, high temperature at 90°C Three stages of reaction 30min. Then add 2250mL hydrogen peroxide into the above reaction device, after fully reacting, pickling, water washing and drying to obtain graphite oxide. The graphene product of the present invention is obtained after graphite oxide is expanded and reduced in air at 350° C. for 30 minutes. The specific surface area of ​​the prepared graphene is about 432m 2 / g. Mix the above-mentioned graphene with binder and conductive carbon black evenly (the mass ratio of each component is 90:5:5), coat it on the nickel foam, dry it, and cut it into a disc with a diameter of 1.0cm, as the sample to be tested. Electrodes are used where the active material loading is greater ...

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Abstract

The invention relates to a graphene for an electrical double-layer capacitor and a preparation method of the graphene. The preparation method of the graphene includes the steps that (1) graphite, potassium nitrate and potassium permanganate are weighted, mixed evenly and put into a reaction kettle, and concentrated sulfuric acid is weighed and added to the reaction kettle; (2) the reaction kettle in the step (1) is placed in a thermostat and is subjected to low temperature constant temperature oxidizing reaction, medium temperature constant temperature oxidizing reaction and high temperature constant temperature oxidizing reaction; (3) oxidizing agents are added to products obtained after reaction in the step (2) is finished, oxidizing reaction is conducted, and then products are subjected to acid pickling, washing and drying; (4) the products obtained in the step (3) are subjected to puffing and reduction in the air atmosphere, or are subjected to puffing and reduction in the high temperature inert atmosphere, and end products are obtained. The graphene can be used as electrode materials of the electrical double-layer capacitor or conductive additives of a lithium ion battery, the amount of layers of the graphene is less, the crystal structure is complete, the size is large, bend and drape exist in the microstructure, the agglomerated degree is small, the specific capacitance value is high, the process is simple, and the graphene is suitable for large scale production.

Description

technical field [0001] The invention relates to graphene used as an electrode material of a supercapacitor battery and a preparation method thereof, belonging to the field of capacitors and new materials thereof. Background technique [0002] Graphene is a two-dimensional crystal. Carbon atoms are arranged in a hexagonal shape and connected to each other to form a carbon molecule. Its structure is very stable. Graphene transfers electrons faster than known conductors at room temperature, and its structure at the atomic scale is so special that it can only be described by relativistic quantum physics. The structure of graphene is very stable. So far, researchers have not found any missing carbon atoms in graphene. The connection between each carbon atom in graphene is very flexible. When an external mechanical force is applied, the surface of the carbon atom bends and deforms, so that the carbon atoms do not need to be rearranged to adapt to the external force, and the struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/36H01G11/24H01G11/86
CPCY02E60/13
Inventor 李星漆长席蒋虎南胡建
Owner DAYING JUNENG TECH & DEV
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