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Preparation method of capacitor

A technology of capacitors and electrolytes, which is applied in the fields of hybrid capacitor electrodes, electrolytic processes, electrolytic components, etc., can solve problems such as waste and achieve the effect of improving pseudocapacitance

Inactive Publication Date: 2020-01-07
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the polyimide industrial waste is now treated as garbage, which is very wasteful

Method used

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  • Preparation method of capacitor
  • Preparation method of capacitor
  • Preparation method of capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The polyimide film heat-treated at 1300°C was selected as the positive electrode material, immersed in 0.2mol / L ammonia water electrolyte, and electrolyzed at a voltage of 30V for 2 hours to obtain graphene carbon dots dispersed in the electrolyte.

[0025] The graphene carbon dots obtained by the above method were removed by heating and evaporating ammonia water to obtain a graphene carbon dot dispersion liquid with a nitrogen content of 5%. Mix the graphene carbon dots with the graphene solution, the content of the graphene carbon dots is 1% of the total amount of the composite, freeze at -40°C, and then freeze-dry in a lyophilizer to obtain a 1mm thick air condensation glue. The airgel is placed in a reducing agent, which is a mixture of hydroiodic acid:ethanol:water with a volume ratio of 1:5:50. Then the reducing solution loaded with airgel was reduced in an oven at 90°C. The reduced airgel was washed repeatedly to remove the residue of hydroiodic acid, then soak...

Embodiment 2

[0028] Choose carbonized polyimide film at 1300°C as the positive electrode material, immerse in 0.2mol / L ammonia water electrolyte, and conduct electrolysis at a voltage of 30V for 2 hours;

[0029] Through the above steps, the graphene carbon dots dispersed in the electrolytic solution are obtained, the ammonia water is removed by heating and evaporating, and the graphene carbon dot dispersion liquid with a nitrogen content of 5% is obtained. Mix the graphene carbon dots with the graphene solution, the ratio of the graphene carbon dots is 3% of the composite, freeze at -40°C, and then freeze-dry in a lyophilizer to obtain an airgel with a thickness of 1 mm. The airgel is placed in a reducing agent, the reducing agent is a mixture of hydroiodic acid:ethanol:water, and the volume ratio of the three is 1:5:50. Then the reducing solution loaded with airgel was reduced in an oven at 90°C. The reduced airgel was washed repeatedly to remove the residue of hydroiodic acid, then soa...

Embodiment 3

[0031] Choose carbonized polyimide film at 1300°C as the positive electrode material, immerse in 0.2mol / L ammonia water electrolyte, and conduct electrolysis at a voltage of 30V for 2 hours;

[0032] Through the above steps, the graphene carbon dots dispersed in the electrolytic solution are obtained, the ammonia water is removed by heating and evaporating, and the graphene carbon dot dispersion liquid with a nitrogen content of 5% is obtained. Mix the graphene carbon dots with the graphene solution, the proportion of the graphene carbon dots is 5% of the composite, freeze at -40°C, and then freeze-dry in a lyophilizer to obtain an airgel with a thickness of 1 mm. The airgel is placed in a reducing agent, the reducing agent is a mixture of hydroiodic acid:ethanol:water, and the volume ratio is 1:5:50. Then the reducing solution loaded with airgel was reduced in an oven at 90°C. The reduced airgel was washed repeatedly to remove the residue of hydroiodic acid, then soaked in 1...

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Abstract

The invention discloses a preparation method of a capacitor. A graphene carbon dot based capacitor adopts graphene carbon dots prepared from cheap raw materials as a filler, so that the obtained capacitor can be massively produced; and by adding a certain proportion of graphene carbon dots to graphene, the mass specific capacity and the rate capability of the capacitor can be effectively improved.Polyimide, polyacrylonitrile, asphalt and industrial wastes thereof or corresponding industrial wastes are used as raw materials, so that a large number of graphene carbon dots can be prepared at lowcost, and the requirements of industrial application are met. The carbon dots prepared by the method can directly realize nitrogen doping, and the nitrogen-doped graphene carbon dots are added into the graphene-based supercapacitor, so that the problems of low mass specific capacity and difficult rate performance improvement of a traditional graphene supercapacitor can be solved.

Description

technical field [0001] The invention belongs to the field of energy technology, in particular to a method for preparing a capacitor. Background technique [0002] Supercapacitor is a new type of low-cost electrochemical energy storage device that meets the current environmental requirements for sustainable development. It has the advantages of high power density, long-term stability and high safety. Based on different energy storage mechanisms, supercapacitors can be divided into electrochemical double-layer capacitors and pseudocapacitors. Among them, pseudocapacitors can obtain higher pseudocapacitance than electrochemical double layer capacitors. Graphene has become a hot material for preparing pseudocapacitors due to its high specific surface area and electrical conductivity. Although graphene capacitors can obtain higher pseudocapacitance, in order to further improve this performance, it is necessary to endow graphene with activity or add active materials to graphene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/36H01G11/44H01G11/30C25B1/00
CPCC25B1/00H01G11/30H01G11/36H01G11/44Y02E60/13
Inventor 高超黄昊光彭蠡俞丹萍沈颖
Owner ZHEJIANG UNIV
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