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High-magnification active carbon and active graphene composite electrode material and preparation method thereof

A graphene composite and electrode material technology, which is applied in the directions of hybrid capacitor electrodes and hybrid/electric double layer capacitor manufacturing, etc., can solve the problems of serious environmental pollution, long time consumption, and difficulty in ensuring uniform dispersion of graphene, and achieves a simple process, The effect of improving the magnification performance

Active Publication Date: 2016-02-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sol-gel process it adopts takes a long time, and the carbonization process of the carbon source used causes serious environmental pollution.
In addition, there are reports of mechanically mixing activated carbon and graphene to prepare composite electrode materials, but it is difficult to ensure the uniform dispersion of graphene on the surface of activated carbon by this method.

Method used

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  • High-magnification active carbon and active graphene composite electrode material and preparation method thereof
  • High-magnification active carbon and active graphene composite electrode material and preparation method thereof
  • High-magnification active carbon and active graphene composite electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Evenly disperse 0.3681g of 325 mesh graphite powder and 0.184g of sodium nitrate powder into 9.57ml of concentrated sulfuric acid solution, and stir for 2h to obtain a uniformly dispersed mixture solution. Note that this process should be carried out in an ice bath or ice-water bath to prevent the temperature of the mixture from becoming too high. Slowly add 1.1 g of potassium permanganate powder to the sulfuric acid solution uniformly dispersed with graphite powder and sodium nitrate powder to form a suspension, and then add 17.68 ml of deionized water to the above suspension. The suspension was heated to undergo high-temperature reaction stages of 35°C and 98°C, and finally graphite oxide was obtained. It is not necessary to separate the obtained graphite oxide from the reaction system, but directly add it to a 250ml beaker, measure 100ml of distilled water into it with a graduated cylinder, and then ultrasonicate it for 8 hours to obtain a graphene oxide dispersion, ...

Embodiment 2

[0031] Add the graphite oxide prepared in Example 1 into a 250ml beaker, measure 100ml of distilled water with a measuring cylinder and pour it into it, then ultrasonicate it for 8h to obtain a graphene oxide dispersion, and then add 8.645g of the graphene oxide dispersion to the graphene oxide dispersion Activated carbon is mixed, and after stirring evenly, the mixed solution is dried. The dried product was heated to 400° C. for reduction activation under nitrogen atmosphere, and kept for 6 hours. After cooling, the obtained primary product was washed (pH=6-7), filtered, and dried to obtain the final product.

[0032] The above-mentioned final products were dried in a blast drying oven at 100° C. and stored for electrochemical performance testing. The composite material is mixed according to the ratio of active material: conductive agent: binder = 85:10:5 to make electrode sheet, then carry out cyclic voltammetry test in 6MKOH electrolyte, test result is as follows Image 6 ...

Embodiment 3

[0034] The graphite oxide prepared in Example 1 was added to a 250ml beaker, and 100ml of distilled water was poured into it with a measuring cylinder, and then ultrasonicated for 8h to obtain a graphene oxide dispersion, and then 4.095g of the graphene oxide dispersion was added to the graphene oxide dispersion. Activated carbon is mixed, and after stirring evenly, the mixed solution is dried. The dried product was heated to 400° C. for reduction activation under nitrogen atmosphere, and kept for 6 hours. After cooling, the obtained primary product was washed (pH=6-7), filtered, and dried to obtain the final product.

[0035] The above-mentioned final products were dried in a blast drying oven at 100° C. and stored for electrochemical performance testing. The composite material is mixed according to the ratio of active material: conductive agent: binder = 85:10:5 to make an electrode sheet, and then carry out a constant current charge and discharge test in a 6MKOH electrolyte...

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Abstract

The invention relates to a high-magnification active carbon and active graphene composite electrode material and a preparation method thereof. The material is characterized in that active carbon is uniformly dispersed into an activator-contained oxidized graphene solution and heated to remove moisture therein, an obtained mixture is reduced and activated at certain temperature in the protective atmosphere, and a product is washed, filtered and dried to obtain the active carbon and active graphene composite electrode material. The active carbon and active graphene composite electrode material provided by the invention is high in the specific capacity and magnification, and the specific capacitive of the material is kept in 250F / g in the current density range of 2-10A / g; and the preparation method of the material is simple in technical process, saves time, is low in cost and is easy to realize large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of electrochemical supercapacitors, in particular to a high-rate activated carbon / activated graphene composite supercapacitor electrode material and a preparation method thereof. Background technique [0002] Supercapacitor (Supercapacitor), also known as ultracapacitor (ultracapacitor), electrochemical capacitor (Electrochemical Capacitor, EC), electrochemical supercapacitor (Electrochemical Supercapacitor), is a new type of energy storage device, which can complete charging in a few seconds. In addition, supercapacitors also have the characteristics of high output power density, wide operating temperature range, long cycle life, economical and environmental protection. Supercapacitors have great application value and market potential in the fields of renewable energy utilization, transportation, electric power, communication, national defense and so on. In particular, the rise of wind power, photovoltaic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/34H01G11/86
CPCY02E60/13
Inventor 阎景旺李萍姜靓高兆辉李然衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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