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Method for preparing different-electrode composite materials of carbon plate/manganese dioxide nanometer sheet and application thereof

A manganese dioxide and composite material technology, applied in electrical components, electrolytic capacitors, capacitors and other directions, can solve the problems of difficult assembly, high cost of organic electrolyte, poor conductivity, etc., to improve conductivity, suitable for large-scale production, Good specific energy density

Active Publication Date: 2013-02-06
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the effective methods is to use organic electrolytes to increase the potential window, but organic electrolytes are expensive, poor in conductivity, and difficult to assemble in air

Method used

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  • Method for preparing different-electrode composite materials of carbon plate/manganese dioxide nanometer sheet and application thereof
  • Method for preparing different-electrode composite materials of carbon plate/manganese dioxide nanometer sheet and application thereof
  • Method for preparing different-electrode composite materials of carbon plate/manganese dioxide nanometer sheet and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 0.2 g of mesoporous carbon nanosheets were ultrasonically dispersed into 100 ml of 2M sulfuric acid solution, heated to 70° C. and stirred for 3 hours, and then filtered with suction to obtain acidified mesoporous carbon nanosheets. Add 0.05g of acidified mesoporous carbon nanosheets to 25ml of 0.5M sulfuric acid solution, ultrasonically disperse it for 15 minutes, raise the temperature to 50°C, add 0.1g of KMnO 4 , stirred and reacted for 5 minutes, and the product was washed and dried to obtain a hierarchical composite material of carbon sheet / manganese dioxide nanosheet.

Embodiment 2

[0030] 0.2 g of mesoporous carbon nanosheets were ultrasonically dispersed into 100 ml of 2M sulfuric acid solution, heated to 70° C. and stirred for 3 hours, and then filtered with suction to obtain acidified mesoporous carbon nanosheets. Add 0.05g of acidified mesoporous carbon nanosheets to 25ml of 0.5M sulfuric acid solution, ultrasonically disperse it for 15 minutes, raise the temperature to 50°C, add 0.1g of KMnO 4 , stirred and reacted for 10 minutes, and the product was washed and dried to obtain a hierarchical composite material of carbon sheet / manganese dioxide nanosheet. Electron microscope photographs of the product figure 1 shown.

Embodiment 3

[0031] Example 3 Electrochemical characterization of carbon sheet / manganese dioxide nanosheet composite

[0032] Mix the composite material prepared in Examples 1 and 2, conductive carbon black and polytetrafluoroethylene emulsion in a mass ratio of 85:10:5, add a small amount of absolute ethanol, and press it into a thin sheet with a thickness of about 1mm. Punched into a disc with a diameter of 11mm, and then compacted under a pressure of 10MPa. Two electrodes of equal mass are used as the positive and negative electrodes of the capacitor, a diaphragm is sandwiched between them, and a 1 M sodium sulfate solution is used as the electrolyte to assemble a simulated symmetrical supercapacitor. The composite material is used as the positive electrode material, and the carbon sheet is used as the negative electrode material to assemble an asymmetric supercapacitor. The assembled supercapacitor was subjected to cyclic voltammetry and constant current charge and discharge tests at ...

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Abstract

The invention relates to a method for preparing different-electrode composite materials of a carbon plate / manganese dioxide nanometer sheet and the application thereof. In the application, the prepared composite materials serve as the anode materials, the carbon plate serves as the cathode materials, and the anode materials and the cathode materials are together assembled into an asymmetric capacitor. The method includes: using a mesoporous carbon nanometer sheet to serve as a carrier to react with potassium permanganate (KMnO4) after acidification to obtain the different-electrode composite materials of the carbon plate / manganese dioxide nanometer sheet. The acidified carbon plate and the KMnO4 have a redox reaction, and the carbon plate can increase the conductivity of the manganese dioxide nanometer sheet, and simultaneously improve the electrochemical stability and multiplying power characteristics of the composite materials. The content of the manganese dioxide in the composite materials can be controlled by adjusting the time of the redox reaction, and accordingly the electrochemical performance of the composite materials can be affected. The method is simple, the raw materials are low in cost, the content of the components in the composite materials can be adjusted easily, scale production can be carried out easily, and the assembled asymmetric capacitor has the advantages of being high in specific capacitance, high in energy density and good in stability.

Description

technical field [0001] The invention belongs to the field of new energy materials, and relates to a preparation method of an asymmetric capacitor positive electrode material, in particular to a preparation method of a carbon sheet / manganese dioxide nanosheet graded composite material and its application. Background technique [0002] As a new type of energy storage device, supercapacitor has the characteristics of high power density, long cycle life and wide temperature range. important application value. With the rise of electric vehicles and hybrid electric vehicles, the importance of energy storage devices with high energy density and high power density is becoming more and more significant. Therefore, under the premise of maintaining high power and long life of supercapacitors, improving energy density has become a hot spot in supercapacitor research. The formula for calculating the energy density of a supercapacitor is: E=1 / 2CV 2 , it is obvious that the energy densi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042
CPCY02E60/13
Inventor 李春忠严燕芳程起林姜立学
Owner EAST CHINA UNIV OF SCI & TECH
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