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Supercapacitor electrode material preparation method based on three-dimensional graphene

A technology for supercapacitors and electrode materials, applied in the field of energy storage materials, can solve problems such as expensive CVD equipment and maintenance costs, limit large-scale industrial production, and increase the cost of electrode material production. The method is simple and easy to operate

Inactive Publication Date: 2014-01-29
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, expensive CVD equipment, maintenance costs, and complicated preparation procedures increase the cost of electrode materials and limit large-scale industrial production.

Method used

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  • Supercapacitor electrode material preparation method based on three-dimensional graphene
  • Supercapacitor electrode material preparation method based on three-dimensional graphene
  • Supercapacitor electrode material preparation method based on three-dimensional graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] After the nickel foam with the surface oxide removed was cut into 1cm×2.5cm, it was pre-wetted with absolute ethanol and deionized water, and then soaked in the graphene oxide dispersion with a concentration of 2mg / ml or 4mg / ml, and ultrasonically Let dry after 15 minutes. After drying, soak it into the graphene oxide dispersion and let it stand for 15 minutes, then let it dry. The quality of the graphene oxide deposited on the nickel foam is controlled by controlling the times of immersion, and the times of immersion can be 1 time, 2 times, 3 times, 4 times, 5 times, 6 times. Soak the dried graphene oxide electrode into a beaker filled with 20ml of ascorbic acid aqueous solution (concentration: 10mg / ml), seal it with plastic wrap, and then put the beaker in a water bath at a temperature of 60 degrees. After maintaining this temperature for 5 hours, the samples were rinsed and dried to remove moisture.

[0033] The prepared three-dimensional graphene / nickel foam compo...

Embodiment 2

[0036] Put the three-dimensional graphene / nickel foam composite electrode prepared in Example 1 into a beaker of hydrochloric acid solution with a molar concentration of 3mol / L, then put the beaker into a water bath with a temperature of 80°C, and keep the temperature for 25 minutes , the surface density of the graphene / nickel foam composite electrode is changed from the original 30.6mg / cm 2 Reduced to 22.8mg / cm 2 . The prepared three-dimensional graphene / nickel foam composite electrode was composed of a symmetrical two-electrode system, and a cyclic voltammetry test and a constant current charge-discharge test were performed in a 5M KOH electrolyte. The cyclic voltammetry curve is close to a rectangle at a higher scan rate, showing an ideal electric double layer capacitance behavior; the mass specific capacitance is as high as 131F / g when the charge and discharge current density is 1mA / cm2.

Embodiment 3

[0038] Put the three-dimensional graphene / nickel foam composite electrode prepared in Example 1 into a beaker of hydrochloric acid solution with a molar concentration of 3mol / L, then put the beaker into a water bath with a temperature of 80°C, and keep the temperature for 50 minutes , the surface density of the graphene / nickel foam composite electrode is changed from the original 30.6mg / cm 2 Reduced to 13.1mg / cm 2 . The prepared three-dimensional graphene / nickel foam composite electrode is composed of a symmetrical capacitor device, and a cyclic voltammetry test and a constant current charge and discharge test are performed in a 5M KOH electrolyte. At a higher scan rate, the cyclic voltammetry curve is close to a rectangle, showing an ideal electric double layer capacitance behavior; when the charge and discharge current density is 1mA / cm 2 When the mass specific capacitance is as high as 124F / g.

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Abstract

A supercapacitor electrode material preparation method based on three-dimensional graphene comprises the steps that foamed nickel with surface oxide removed is steeped in oxidized graphene dispersion liquid, the oxidized graphene is made to be deposited on the foamed nickel, and then the foamed nickel is aired to remove moisture at room temperature after being taken out. The steeping method comprises the steps that the foamed nickel is steeped in the oxidized graphene dispersion liquid with the concentration of 0.5mg / ml-10mg / ml, and is aired after ultrasonic processing is carried out for 1-30 minutes; the quality of the oxidized graphene deposited on the foamed nickel is controlled through the concentration of the oxidized graphene and steeping times, and the steeping times is 1 to 30 times. The prepared oxidized graphene / foamed nickel composite electrodes are reduced through ascorbic acid, then a part of metal nickel is etched and removed by using a chemical etching method or a part of the metal nickel is simultaneously reduced, etched and removed through hydroiodic acid to obtain graphene / foamed nickel composite electrodes. The supercapacitor electrode material preparation method based on the three-dimensional graphene is simple, easy to operate, capable of improving the performance of supercapacitors and reducing manufacturing cost, and suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials. In particular, it relates to a method for preparing a graphene electrode material with a three-dimensional structure. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, have the characteristics of high power density, fast charging and discharging capabilities, and good cycle stability. They have become ideal new energy storage devices for a new generation and have attracted people's attention. At present, carbon materials such as activated carbon, activated carbon fiber, carbon airgel carbon, nanotubes, graphene, etc. are considered as one of the main materials for supercapacitors. Excellent electrical properties, excellent chemical stability and thermodynamic stability, as well as physical and mechanical properties, are considered to be an ideal carbon-based material for supercapacitors. [0003] The electrode preparation method publicly r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86
CPCY02E60/13
Inventor 唐少龙黄海富都有为
Owner NANJING UNIV
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