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Preparation method of graphene composite electrode

A graphene composite and electrode technology, applied in the field of electrochemical power supply, can solve problems affecting capacity, affecting power density, increasing internal resistance, etc.

Inactive Publication Date: 2014-06-04
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when graphene is used as a supercapacitor electrode material, a binder needs to be added, which will lead to a decrease in the specific gravity of the active material, affect the capacity, and increase the internal resistance, affecting the power density.

Method used

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  • Preparation method of graphene composite electrode

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preparation example Construction

[0013] The embodiment of the present invention provides a simple preparation method of the above-mentioned graphene composite electrode. The process flow of this method is as figure 1 shown, including the following steps:

[0014] S01: Obtain graphite oxide;

[0015] S02: Prepare a mixture containing graphene and an organic ionic liquid: add the graphite oxide obtained in step S01 to the molten organic ionic liquid in a mass-volume ratio of 1g: 5-1000ml and mix to obtain a molten mixed solution; then add the mixed solution to the mixed solution Add a reducing agent to the mixture, and perform ultrasonic and centrifugation to obtain a mixture of graphene and organic ionic liquid;

[0016] S03: preparing a graphene composite material layer: performing compression molding on the mixture prepared in step S02, and obtaining the graphene composite electrode precursor after cooling;

[0017] S04: Spraying a metal film: coating the surface of the graphene composite electrode precur...

Embodiment 1

[0039] Graphene composite electrode and preparation method thereof, comprises the steps:

[0040] S11: obtaining graphite oxide;

[0041] Add 50g of 500 mesh natural graphite to 0°C, 1.15L of concentrated sulfuric acid, and then add 150g of potassium permanganate, keep the temperature of the mixture below 10°C, stir for 2h, then stir in a water bath at room temperature for 24h, and then put it in an ice bath. Slowly add 4.6 L of deionized water. After 15 minutes, add 14L of deionized water (which contains 250mL of 30% hydrogen peroxide), after which the color of the mixture turns bright yellow, filter with suction, wash with 2.5L of hydrochloric acid with a concentration of 10%, and filter with suction until the filtrate Neutral.

[0042] S12: Weigh the formula components: weigh graphite oxide and 1-ethyl-3-methylimidazolium bromide (EtMeImBr) respectively according to the mass volume ratio of 1g:10ml;

[0043] S13: Prepare the mixture: add the graphite oxide in step S12 to...

Embodiment 2

[0047] Graphene composite electrode and preparation method thereof, comprises the steps:

[0048] S21: obtaining graphite oxide;

[0049] Add 50g of 500-mesh artificial graphite to 0°C, 1.15L of concentrated sulfuric acid, then add 150g of potassium permanganate, keep the temperature of the mixture below 10°C, stir for 2h, then stir in a water bath at room temperature for 24h, then put it in an ice bath Slowly add 4.6 L of deionized water. After 15 minutes, add 14L of deionized water (which contains 250mL of 30% hydrogen peroxide), after which the color of the mixture turns bright yellow, filter with suction, wash with 2.5L of hydrochloric acid with a concentration of 10%, and filter with suction until the filtrate Neutral.

[0050] S22: Weigh the formula components: weigh graphite oxide and 1-ethyl-3-methylimidazolium chloride (EtMeImCl) respectively according to the mass volume ratio of 1g:100ml;

[0051] S23: Prepare the mixture: Add the graphite oxide in step S22 to the...

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Abstract

The invention provides a preparation method of a graphene composite electrode. The preparation method of the graphene composite electrode comprises the steps that graphite oxide is prepared, the graphite oxide, organic ionic liquid and a reducing agent are mixed and are placed in an ultrasonic instrument to obtain the graphene in an exfoliation mode, a mixture of the graphene and the organic ionic liquid is obtained, then the mixture is placed in a mould, and the graphene composite electrode is obtained through the steps of pressure application and cooling. The preparation method of the graphene composite electrode optimizes the manufacturing process of an electrochemical power source, lowers manufacturing cost, is wide in source of raw materials, and achieves industrialization easily. The graphene composite electrode prepared through the method improves the proportion of active materials and energy density.

Description

technical field [0001] The invention belongs to the technical field of electrochemical power sources, and in particular relates to a preparation method of a graphene composite electrode. Background technique [0002] Graphene is a two-dimensional carbon atom crystal discovered by Andre K. Geim of the University of Manchester in 2004, and won the Nobel Prize in Physics in 2010, which once again sparked an upsurge in carbon material research. Due to its unique structure and photoelectric properties, it has become a research hotspot in the fields of carbon materials, nanotechnology, condensed matter physics and functional materials, attracting many scientific and technological workers. Graphene has excellent electrical and thermal conductivity and low thermal expansion coefficient, and its theoretical specific surface area is as high as 2630m 2 / g, can be used in effect transistors, electrode materials, composite materials, liquid crystal display materials, sensors, etc. At p...

Claims

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Application Information

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IPC IPC(8): H01G11/34H01G11/86
Inventor 周明杰袁新生王要兵钟辉
Owner OCEANS KING LIGHTING SCI&TECH CO LTD