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Method for preparing super capacitor electrode material

A technology for supercapacitors and electrode materials, applied in hybrid capacitor electrodes, hybrid/electric double-layer capacitor manufacturing, double-layer capacitors, etc., can solve the problems of low power density, specific capacitance drop, and long experiment period, and reduce the reaction temperature , good electrochemical performance, and the effect of shortening the reaction time

Inactive Publication Date: 2015-03-25
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Activated carbon material has high specific surface area and good conductivity, but its specific capacitance in neutral electrolyte is very small. Manganese dioxide material has high specific capacitance at low current density in neutral electrolyte, but at high current density The lower specific capacitance drops seriously, so people have recently focused on the preparation of manganese dioxide / activated carbon composite materials, expecting to obtain composite materials with high specific capacitance and good rate performance
In 2012, Yongsong luo et al. published an article on JMC to prepare a composite material of manganese dioxide and carbon fiber by solvothermal method, but the experiment period was longer (180min) and the temperature was higher (160°C). The capacity is only 58F / g at a current density of 5A / g, and the power density is low

Method used

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  • Method for preparing super capacitor electrode material
  • Method for preparing super capacitor electrode material
  • Method for preparing super capacitor electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 0.079g of potassium permanganate and put it into 30ml of deionized water and stir until uniform, then add 0.2g of the cleaned activated carbon fiber into the potassium permanganate solution and stir for 10min, then transfer the mixed solution to the reaction kettle under microwave power 300W, 120°C microwave water heating for 30min, after washing, drying at 60°C for 12h to get the composite material.

[0022] Active materials, conductive additives (super P), and binders (PTFE) were mixed according to the mass ratio of 85:10:5, rolled into sheets, and the electrode materials were tested by the three-electrode method. The reference electrode was Ag / AgCl, and the counter electrode It is a platinum sheet, and the electrolyte is selected as the commonly used 1M Na 2 SO 4 Solution, the voltage window is selected as -0.2-0.8V to test cyclic voltammetry and constant current charge and discharge. Assembled into capacitors tested at 50mA / cm 2 (10A / g) The specific capacita...

Embodiment 2

[0025] The difference between embodiment 2 and embodiment 1 is that the potassium permanganate of 0.316g has been added, and other conditions are the same, and the manganese dioxide / activated carbon fiber composite material has been obtained equally, and it is assembled into a capacitor test at 50mA / cm 2 (10A / g) The specific capacitance under the current density is 24F / g.

[0026] From Figure 4 In the SEM photos, it can be seen that the composite method of the two materials is that manganese dioxide is wrapped on the activated carbon fiber.

Embodiment 3

[0028] The difference between Example 3 and Example 1 is that 0.632 g of potassium permanganate was added, and other conditions were the same, and a manganese dioxide / activated carbon fiber composite material was also obtained.

[0029] From Figure 5 In the SEM photos, it can be seen that the composite method of the two materials is that manganese dioxide is wrapped on the activated carbon fiber, and the coating is very uniform. From Figure 7 It can be seen from the CV curve of the composite material that the composite material has good capacitance, and the curve is close to a rectangle. From Figure 8 The rate comparison of the three materials shows that the composite material combines the rate properties of activated carbon fiber and the high capacity of manganese dioxide. The capacity is moderate under low current, and the performance is excellent under high current. The power density has been greatly improved. , at 50mA / cm 2 (10A / g) at a high current density, the spe...

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Abstract

The invention discloses a method for preparing super capacitor electrode material, and relates to a method for preparing manganese dioxide / activated carbon fiber composite material. The method includes the steps of dissolving potassium permanganate and activated carbon fiber in deionized water to be stirred to be uniform, transferring a solution to a microwave hydrothermal reaction still, conducting microwave hydrothermal operation for 30 minutes to 180 minutes at a temperature of 60 DEG C to 120 DEG C, and washing away and drying away the deionized water to obtain the manganese dioxide / activated carbon fiber composite material. A one-step microwave hydrothermal reduction method is adopted, and therefore the reaction temperature is lowered, the synthesis time is shortened, the super capacitor electrode material good in performance is obtained, and the specific capacitance under the current density of 5 A / g reaches 109 F / g through testing after the capacitor is assembled.

Description

Technical field: [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a preparation method of a manganese dioxide / activated carbon fiber composite material used for supercapacitor electrodes. Background technique: [0002] Since the beginning of the 21st century, with the continuous depletion of non-renewable energy sources such as oil, natural gas and coal, the development of the world economy has been increasingly affected by it. my country is a country relatively scarce in oil resources. With the continuous rise of international oil prices, It will have a serious impact on the country's economy and oil security, so the research and development of clean energy plays an important role in the sustainable development of the country's economy. [0003] Supercapacitor is a new type of electrochemical energy storage device, which has the characteristics of rich electrode materials, high power density, long charge and discharge life ...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/30H01G11/46H01G11/40
CPCH01G11/00H01G11/30H01G11/34H01G11/40H01G11/46H01G11/86Y02E60/13
Inventor 高宇王禹魏英进赵旭东王春忠陈岗
Owner JILIN UNIV
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