Preparation method of graphene for super capacitor electrode material

A technology for supercapacitors and electrode materials, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors. Performance, simple operation, the effect of superior performance

Inactive Publication Date: 2015-02-04
JIANGSU YINJI CARBON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation methods of graphene include micromechanical exfoliation method, chemical vapor deposition method, electrochemical method and graphite oxide reduction method, among which the preparation process of mechanical exfoliation method is very difficult, the equipment requirements are too high and the output is very low, which is not suitable for industrial production ; The chemical vapor deposition method and the electrochemical method are unstable, the process is difficult to control, and the performance stability of the graphene obtained is poor, and it will lead to a decrease in the specific capacity of the capacitor and a deterioration in cycle performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Use flake graphite powder as raw material (grain size greater than 400 mesh, carbon content greater than 95%), add concentrated sulfuric acid: add 70kg of concentrated sulfuric acid (mass fraction 95%-98%) to 1kg flake graphite powder; Add strong oxidizing agents sodium peroxide and sodium nitrate, the addition amount is 0.5 kg of sodium peroxide and 0.5 kg of sodium nitrate based on 1 kg flake graphite powder, and stir for 2 hours; slowly add 100 kg of water based on 1 kg flake graphite powder, Control the temperature at 80-95°C and stir for 1 hour; centrifuge at 7200 rpm for more than 0.5 hours to achieve solid-liquid separation; wash with warm water at 50-60°C, and the pH of the water after washing should be greater than 6.5; dry at low temperature at 0-10°C until the water content is less than 1 %, and then pass through a 400 mesh sieve, and the under-sieve is graphene oxide powder.

[0022] Reductant solution (i.e. the alcoholic solution of erythorbic acid and gluc...

Embodiment 2

[0025] Use flake graphite powder as raw material (grain size greater than 400 mesh, carbon content greater than 95%), add concentrated sulfuric acid: add 110kg of concentrated sulfuric acid (mass fraction 95%-98%) to 1kg flake graphite powder; Add strong oxidizing agents sodium peroxide and sodium nitrate, the addition amount is 0.5 kg of sodium peroxide and 0.5 kg of sodium nitrate based on 1 kg flake graphite powder, and stir for 2 hours; slowly add 120 kg of water based on 1 kg flake graphite powder, Control the temperature at 80-95°C and stir for 1 hour; centrifuge at 7200 rpm for more than 0.5 hours to achieve solid-liquid separation; wash with warm water at 50-60°C, and the pH of the water after washing should be greater than 6.5; dry at low temperature at 0-10°C until the water content is less than 1 %, and then pass through a 400 mesh sieve, and the under-sieve is graphene oxide powder.

[0026] Reductant solution (i.e. the alcoholic solution of erythorbic acid and glu...

Embodiment 3

[0029] Use flake graphite powder as raw material (grain size greater than 400 mesh, carbon content greater than 95%), add concentrated sulfuric acid: add 90kg of concentrated sulfuric acid (mass fraction 95%-98%) to 1kg flake graphite powder; Add strong oxidizing agents sodium peroxide and sodium nitrate, the addition amount is 0.5 kg of sodium peroxide and 0.5 kg of sodium nitrate based on 1 kg flake graphite powder, and stir for 2 hours; slowly add 110 kg of water based on 1 kg flake graphite powder, Control the temperature at 80-95°C and stir for 1 hour; centrifuge at 7200 rpm for more than 0.5 hours to achieve solid-liquid separation; wash with warm water at 50-60°C, and the pH of the water after washing should be greater than 6.5; dry at low temperature at 0-10°C until the water content is less than 1 %, and then pass through a 400 mesh sieve, and the under-sieve is graphene oxide powder.

[0030] Reductant solution (i.e. the alcoholic solution of erythorbic acid and gluc...

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Abstract

The invention discloses a preparation method of graphene for a super capacitor electrode material. The preparation method comprises the steps of adding concentrated sulfuric acid to crystalline graphite powder serving as a raw material, adding a strong oxidant and sodium nitrate at a temperature within the range of 0-10 DEG C, respectively, and stirring for 2-3 hours, next, slowly adding water, adding 1-2 hours and controlling the temperature within the range of 80-95 DEG C, centrifuging, washing with water and drying to obtain graphene oxide powder, adding the graphene oxide powder to a reducing agent solution controlling the temperature within the range of 75-85 DEG C, performing ultrasonic dispersion processing for 3-4 hours, and then cooling, settling, filtering by suction, washing and drying in vacuum to obtain the graphene. The graphene obtained by use of the preparation method has superior properties in application to a super capacitor; at the current density of 2A/G, the specific capacitance of the material reaches 141F/g, after 300 cycles at different current densities, the specific capacitance is still kept at 130F/g(2A/g); as a result, the material shows excellent rate and cyclic temperature properties.

Description

technical field [0001] The invention relates to a method for a graphene material, in particular to a method for preparing graphene used as an electrode material for a supercapacitor. Background technique [0002] Supercapacitor (Supercapacitor), also known as Electrochemical Capacitor (Electrochemical Capacitor), is a new type of energy storage device, because it has the characteristics of short charging time, long service life, good temperature characteristics, energy saving and environmental protection. As human society enters the 21st century, the rapid development of industry and the sharp increase in population, the society's demand for energy is also gradually increasing. In order to use secondary energy more effectively, new energy storage devices are needed, and among many energy storage devices , supercapacitors have gained widespread attention worldwide due to their high power density and excellent cycle performance. [0003] Graphene is a carbon atom with sp 2 T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/34H01G11/86
CPCY02E60/13H01G11/34H01G11/86
Inventor 张优王利群翁建军钟诚
Owner JIANGSU YINJI CARBON TECH CO LTD
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