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Preparation method and application of supercapacitor electrode

A supercapacitor and electrode technology, which is applied in the field of preparation of supercapacitor electrodes, can solve the problems of harsh experimental conditions, high price, and reduced conductivity of carbon nanotubes.

Active Publication Date: 2016-03-30
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the conductivity of the carbon nanotubes used in this electrode is high, the price is high, and the surfactant in the preparation process is also difficult to remove, and the residual surfactant also reduces the conductivity of the carbon nanotubes. In addition, the method of growing manganese dioxide on the conductive three-dimensional network framework by electrodeposition is very demanding on experimental conditions, and it is difficult to achieve large-scale production

Method used

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  • Preparation method and application of supercapacitor electrode
  • Preparation method and application of supercapacitor electrode
  • Preparation method and application of supercapacitor electrode

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[0031] The present invention provides a method for preparing a supercapacitor electrode, including the following steps:

[0032] a) Prepare a graphene oxide dispersion with a certain mass concentration;

[0033] b) Immerse the elastic three-dimensional porous material into the graphene oxide dispersion obtained in step a), take it out, centrifuge, and then immerse it in a graphene oxide reducing reagent, and reduce it at a certain temperature to obtain a reduced graphene-modified three-dimensional porous material;

[0034] c) The reduced graphene-modified three-dimensional porous material obtained in step b) is immersed in a bivalent manganese solution and a heptavalent manganese solution successively, and then washed with deionized water several times to obtain the final supercapacitor electrode.

[0035] In the present invention, an elastic three-dimensional porous material is used as a skeleton, graphene oxide is uniformly adsorbed on the surface of the skeleton, and the three-dimen...

Embodiment 1

[0044] The graphene oxide prepared by the huumer method is freeze-dried to calibrate the concentration of the graphene oxide dispersion, and according to the concentration, deionized water is added to adjust to a predetermined concentration of 5 mg / ml. Then ultrasonically dispersed for 30 minutes to obtain a uniformly dispersed graphene oxide dispersion.

[0045] Cut the polyester sponge into 1mm×10mm×20mm long squares, wash them with ethanol and water three times respectively, dry them in an oven at 100°C, and then immerse them in the above graphene oxide dispersion, place them for 1 minute, and take them out. Centrifuge at 3000rpm for 2min. After taking it out, quickly immerse it in a 85°C hydroiodic acid solution (the concentration of hydroiodic acid solution used is 100wt%) for reduction. After 90s, take it out and wash with a large amount of tap water, then rinse with ethanol After two times, it was dried in an oven at 200°C for 30 minutes to obtain reduced graphene modified...

Embodiment 2

[0050] The graphene oxide prepared by the huumer method is freeze-dried to calibrate the concentration of the graphene oxide dispersion, and according to the concentration, deionized water is added to adjust to a predetermined concentration of 3.8 mg / ml. Then ultrasonically dispersed for 30 minutes to obtain a uniformly dispersed graphene oxide dispersion.

[0051] Cut the polyester sponge into 1mm×10mm×20mm long squares (the pore size of the polyester sponge used is 100~300μm), wash three times with ethanol and water, dry in an oven at 100°C, and then immerse it in In the above-mentioned graphene oxide dispersion, take it out for 3 minutes, centrifuge for 3 minutes at 2500 rpm, and then quickly immerse it in a hydroiodic acid solution at 90°C (the concentration of hydroiodic acid solution used is 100wt%) for reduction, 30 seconds After that, it was taken out and washed with a large amount of tap water, and then washed twice with ethanol, and dried in an oven at 200°C for 30 minu...

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Abstract

The invention provides a preparing method of a super capacitor electrode. The method comprises the steps of preparing graphene oxide dispersion liquid with certain mass concentration; immersing an elastic three-dimensional cellular material into the graphene oxide dispersion liquid, then taking out the elastic three-dimensional cellular material for centrifugation, and further immersing the elastic three-dimensional cellular material into a graphene oxide reductive agent to obtain a three-dimensional cellular material modified by reduced grapheme at a certain temperature; immersing the three-dimensional cellular material modified by the reduced grapheme into divalent manganese solution and septivalency manganese solution in sequence, and then washing the three-dimensional cellular material for several times with deionized water to obtain the final super capacitor electrode. The super capacitor electrode prepared with the method has the advantages of being good in power density and energy density, good in cycling stability, low in cost, simple in preparing method, and suitable for commercialized production.

Description

Technical field [0001] The invention belongs to the field of supercapacitors, and particularly relates to a preparation method and application of supercapacitor electrodes. Background technique [0002] Today, with high energy consumption, the earth's fossil fuels have gradually been exhausted. Some scientists predict that the oil on the earth will be exhausted in about 50 years, and mankind must look for renewable energy. Solar and wind energy are inexhaustible and inexhaustible. They are ideal alternative energy sources. However, how to quickly store and release these intermittent energy sources has always been a problem. Although the energy density of traditional chemical batteries is very high, the power density is relatively low, and the charge and discharge time is long, so it is difficult to solve the problem of intermittent energy storage. problem. Supercapacitors are a new type of energy storage material that has developed rapidly in recent years. It has a very high po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86H01G11/26H01G11/32
CPCY02E60/13
Inventor 俞书宏葛进姚宏斌
Owner UNIV OF SCI & TECH OF CHINA
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