Graphene electrode and supercapacitor preparation method

A technology of graphene electrodes and supercapacitors, which is applied in the manufacture of hybrid/electric double layer capacitors, etc., can solve the problem of low specific capacity of supercapacitors, and achieve the effect of improving specific capacity

Inactive Publication Date: 2014-05-21
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, graphene used in supercapacitor electrodes is generally formed by adding conductive agents and binders and coating on the surface of current collectors, which will lead to low specific capacity of supercapacitors.

Method used

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  • Graphene electrode and supercapacitor preparation method
  • Graphene electrode and supercapacitor preparation method
  • Graphene electrode and supercapacitor preparation method

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preparation example Construction

[0026] see figure 1 , the preparation method of the graphene electrode of one embodiment, comprises the steps:

[0027] Step S110, preparing graphite oxide.

[0028] Preparation of graphite oxide comprises the following steps:

[0029] Step 1: adding graphite into concentrated sulfuric acid at 0°C, and then adding potassium permanganate to form a mixed solution, keeping the temperature of the mixed solution below 10°C and stirring for 2 hours.

[0030] Preferably, the purity of graphite is 99.5%.

[0031] Preferably, the solid-to-liquid ratio of graphite to concentrated sulfuric acid is 1g:23mL. The mass concentration of concentrated nitric acid is 30%.

[0032] Preferably, the mass ratio of graphite to potassium permanganate is 1:3.

[0033] Step 2, keeping the temperature of the mixture at room temperature and stirring for 24 hours.

[0034] Step 3. Put the mixed solution in an ice-water mixing bath, add deionized water to the mixed solution, add hydrogen peroxide solu...

Embodiment 1

[0058] 1. Preparation of graphite oxide by improved Hummers method:

[0059] Add 0.5g of 500-mesh graphite powder to 0°C, 11.5mL of concentrated sulfuric acid, then add 1.5g 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 place in an ice bath Add 46 mL of deionized water slowly. After 15 minutes, add 140mL of deionized water (which contains 2.5mL of 30% hydrogen peroxide), after which the color of the mixture turns bright yellow, filter with suction, wash with 250ml of hydrochloric acid with a concentration of 10%, and filter with suction until the filtrate Neutral.

[0060] 2. Take 5g of graphite oxide and put it into a 30mm*50mm mold, add a mold cover, transfer the mold to a vertical muffle furnace filled with hydrogen and nitrogen with a volume ratio of 1:1, and apply a constant pressure of 20MPa to the mold , heat the muffle furnace to 550°C until the mold cover no longer mo...

Embodiment 2

[0074] 1. Preparation of graphite oxide by improved Hummers method:

[0075] Add 0.5g of 500-mesh graphite powder to 0°C, 11.5mL of concentrated sulfuric acid, then add 1.5g 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 place in an ice bath Add 46 mL of deionized water slowly. After 15 minutes, add 140mL of deionized water (which contains 2.5mL of 30% hydrogen peroxide), after which the color of the mixture turns bright yellow, filter with suction, wash with 250ml of hydrochloric acid with a concentration of 10%, and filter with suction until the filtrate Neutral.

[0076] 2. Take 50g of graphite oxide and put it into a 30mm*50mm mold, add a mold cover, transfer the mold to a vertical muffle furnace filled with hydrogen and argon with a volume ratio of 1:5, and apply a constant pressure of 10MPa to the mold Pressure, heat the muffle furnace to 700°C until the mold cover no l...

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Abstract

The invention discloses a graphene electrode preparation method. The graphene electrode preparation method comprises the following steps: graphite oxide is arranged in a mould, in the reducing gas atmosphere, the temperature of the graphite oxide is increased to 550 DEG C-700 DEG C and a pressure in the range from 10MPa to 30MPa is applied to the graphite oxide until the size of the graphite oxide is not changed, and then the graphite oxide is subjected to the temperature and pressure maintaining process for 20 minutes to 40 minutes to press the graphite oxide into a graphene block; in the protective gas atmosphere, the graphene block is cooled to the ambient temperature; and a metal film is formed on one surface of the graphene block to obtain a graphene electrode. The graphene electrode prepared through the above graphene electrode preparation method can be used to improve the specific capacity of a supercapacitor. The invention further provides a supercapacitor preparation method.

Description

technical field [0001] The invention relates to a preparation method of a graphene electrode and a preparation method of a supercapacitor. Background technique [0002] Graphene is a two-dimensional monolayer material with excellent physical properties, such as high theoretical specific surface area, excellent mechanical strength, good flexibility and high electrical conductivity, etc., and has attracted extensive attention from researchers. At present, graphene used in supercapacitor electrodes is generally formed by adding conductive agents and binders and coating on the surface of current collectors, which will lead to low specific capacity of supercapacitors. Contents of the invention [0003] Based on this, it is necessary to provide a method for preparing a graphene electrode capable of increasing the specific capacity of a supercapacitor and a method for preparing a supercapacitor. [0004] A kind of preparation method of graphene electrode, comprises the steps: ...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/84
CPCY02E60/13
Inventor 周明杰袁新生王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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