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A kind of supercapacitor and preparation method thereof

A supercapacitor and ultrasonic technology, applied in the field of capacitors, can solve the problems that the energy density is not as good as that of batteries, which restricts the promotion and application of supercapacitors, and achieves the effects of electric double layer charge storage, battery power shortage and high power density

Active Publication Date: 2016-09-14
CHENGDU DAAISI ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the existing supercapacitors use porous activated carbon as the electrode material, and realize the storage of electric double layer charge by increasing the specific surface area. Although the power density can reach more than 10 times that of the battery, the energy density is less than one tenth of the battery, which is serious. Restricting the popularization and application of supercapacitors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method for a supercapacitor: put 0.5g of graphite oxide into a beaker, add 200ml of deionized water, and ultrasonically obtain a brown-yellow uniformly dispersed graphene oxide colloidal solution for 1 hour, and put the graphene oxide colloidal solution into a 500ml three-neck In the bottle, heat in a water bath at 80°C, add 5.5g of sodium boron oxide for reduction for 2-3 hours, and finally obtain a black flocculent precipitate, wash the precipitate, filter it with suction, and dry it to obtain a graphene powder. Add 5mol / L RuCl 3 ·XH 2 O was dissolved in aqueous ethanol and slowly added NH 4 HCO 3 Aqueous solution, control the pH value between 5-5.5, after fully stirring for 10 to 20 hours, filter or centrifuge, wash with pure water until the pH value is neutral, and heat-treat the filter cake obtained after filtration at 200-300°C for 8- After 12 hours, amorphous ruthenium oxide nanopowder was obtained, and then graphene and RuO 2 ·XH 2 O powder was...

Embodiment 2

[0028] A preparation method for a supercapacitor: 2.5g / L graphene oxide is ultrasonically dispersed to obtain a uniformly dispersed graphene oxide colloidal solution, and then mixed with 0.5mol / L RuCl 3 ·XH 2 Mix O alcohol and aqueous solution, add hydrazine hydrate with a mass fraction of 80%, heat in a water bath at a constant temperature of 70-80°C, and stir thoroughly for 10-12 hours to obtain a graphene-ruthenium oxide coprecipitated composite, filter the composite, and rinse with pure water To neutrality, the filter cake is heat-treated at 200-300° C. for 8-12 hours to obtain composite nanopowder. The composite nanopowder, conductive graphite, and polytetrafluoroethylene are mixed at a ratio of 85:10:5 to prepare a slurry, which is hot-pressed on a tantalum foil to form a supercapacitor composite electrode, and then a polypropylene porous membrane is used as a diaphragm, 38%H 2 SO 4 The aqueous solution is used as the electrolyte to assemble a supercapacitor. Under th...

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Abstract

The invention discloses a super capacitor and a method for manufacturing the super capacitor. The super capacitor is formed by mixing or jointly depositing porous carbon materials, such as activated carbon, carbon nano tubes and graphene, and ruthenium oxide. The super capacitor overcomes the serious defects that an existing super capacitor is low in energy density, the high conductivity and excellent specific surface area of the graphene are fully utilized to achieve double-layer charge storage, and the problem that the power of a battery is insufficient is solved; meanwhile, due to the fact that the theoretical specific capacity of the ruthenium oxide is maximum compared with other oxidizing materials, the Faraday capacitance and charge storage mechanism of the ruthenium oxide is fully utilized, and the energy density of the super capacitor is increased remarkably; as a result, the graphene-ruthenium oxide super capacitor has the advantages of being high in power density and high in energy density, and a firm foundation is laid for achieving the engineering and practicability of the super capacitor.

Description

technical field [0001] The invention relates to a capacitor of novel electrochemical energy storage technology, in particular to a supercapacitor and a preparation method thereof. Background technique [0002] Supercapacitor is a new type of energy device researched and developed in recent years. Its performance is between that of batteries and ordinary capacitors. Maintenance-free, no pollution to the environment and other advantages. [0003] With the continuous advancement of science and technology, people pay more and more attention to green energy and ecological environment. As a new type of energy storage device, supercapacitors have a very wide range of uses, especially in electric vehicles and electric bicycles, which can be used in combination with batteries. Realize high-current discharge to make up for the lack of battery power; on the other hand, in the process of electric vehicle starting, downhill and braking, energy recovery is realized, which reduces the ene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/30H01G11/36H01G11/46H01G11/84H01G11/86
CPCY02E60/13
Inventor 陈虹卢云卢毅舒建军
Owner CHENGDU DAAISI ELECTRONICS
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