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A kind of preparation method of manganese dioxide/carbon composite electrode material

A technology of manganese dioxide and electrode materials, which is applied in the field of electrochemistry, can solve problems such as difficulty in ensuring sufficient contact, affecting material capacitance performance, and insufficient preparation cost, and achieves low cost, easy operation and control, and low equipment requirements.

Active Publication Date: 2019-02-01
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to ensure sufficient contact between manganese dioxide and carbon materials in the obtained composite material by powder blending and adding carbon materials to the solution when preparing manganese dioxide by chemical method, which affects the performance of the capacitance performance of the material.
However, the vapor deposition method is still insufficient in terms of preparation cost.
In order to fully contact the manganese dioxide and the carbon material in the prepared composite material, it is an effective method to first oxidize the carbon material in an oxyacid and graft it with divalent manganese and then react with potassium permanganate. method, but this method still has the disadvantages that the preparation process is relatively complicated, and the strong acid and high pressure reaction link in the preparation process has strict requirements on equipment.

Method used

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  • A kind of preparation method of manganese dioxide/carbon composite electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]Prepare 100mL of mixed aqueous solution containing sucrose, citric acid and mannitol, wherein the sucrose concentration is 0.5mol / L, and the content of citric acid and mannitol is respectively 5% and 10% of the sucrose content (weight). Add Carbon nanotubes (CNT, whose size is: average diameter 7nm, average length 6m) 0.5g, stirred at room temperature for 3 hours, filtered, dried and ground, and then put into a muffle furnace for 1 hour at 240°C to obtain a surface evenly covered with sucrose , sucrose hydrolyzate, citric acid, carbon nanotubes of mannitol.

[0040] The above-mentioned carbon nanotubes covered with sucrose, sucrose hydrolyzate, citric acid and mannitol were placed in KMnO with a concentration of 0.2mol / L 4 The solution was moved to a water bath and stirred continuously at 60°C for 12h. After the mixture was naturally cooled to room temperature, it was vacuum filtered and the filter cake was washed with deionized water until the filtrate was colorless (t...

Embodiment 2

[0043] Experimental process is identical with embodiment 1, just replaces sucrose with glucose, and glucose concentration is 0.1mol / L, and the consumption of citric acid and mannitol is respectively 1% and 20% of glucose content (weight), soaking-drying step heat treatment temperature is 150°C, the treatment time is 3 hours, soaking-drying-heat treatment is repeated 3 times, the carbon nanotubes covered with glucose are put into the potassium permanganate solution at room temperature and the reaction time is 24 hours. The specific capacitance of the obtained composite material was 311.1 F / g.

Embodiment 3

[0045] The experimental process is the same as in Example 1, except that arabinose is used instead of sucrose, the concentration of arabinose is 0.2mol / L, the consumption of citric acid and mannitol is respectively 1% and 20% of the arabinose content (weight), and the heat treatment temperature is 180 ℃, the treatment time is 2 hours, soaking-drying-heat treatment is repeated 3 times, and the carbon nanotubes covered with arabinose are put into the potassium permanganate solution at a temperature of 40 ℃ for 10 hours. The specific capacitance of the obtained composite material was 338.9F / g.

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Abstract

The invention relates to a preparation method of a manganese dioxide / carbon composite electrode material. The preparation method comprises the steps of (1) placing a carbon material into a mixed solution containing sugar to carry out surface treatment such that sugar molecules are fully adsorbed at the surface of the carbon material, (2) carrying out heat treatment on the carbon material whose surface is processed such that a part of sugar at the surface of the carbon material is in dehydration condensation, melting and solidification, and obtaining the carbon material whose surface has uniformly distributed hydroxyl groups, (3) allowing the carbon material with uniformly distributed hydroxyl groups on the surface and permanganate and / or manganate to react to obtain the manganese dioxide / carbon composite electrode material. According to the method, through coating and curing sugar at the surface of the carbon material and allowing the sugar and the permanganate and / or manganate to generate an in-situ oxidation reduction reaction at the surface of the carbon material to generate manganese dioxide, thus the manganese dioxide and the carbon material in the composite material are in full contact so as improve the electronic conductivity of the material, and the capacitance properties of the material are improved. The preparation process and equipment requirements of the invention are simple, and convenience is brought to industrial production.

Description

technical field [0001] The invention relates to a preparation method of a manganese dioxide / carbon composite electrode material, belonging to the technical field of electrochemistry. technical background [0002] Supercapacitor is a new concept energy storage device between batteries and traditional electrostatic capacitors. Compared with traditional electrostatic capacitors such as aluminum electrolytic capacitors, supercapacitors have higher specific capacitance, and the energy density that can be stored is traditional electrostatic capacitors Compared with batteries, supercapacitors have greater power density, and have the characteristics of high charge and discharge efficiency and long cycle life. Due to the many advantages above, the development of supercapacitor technology has been widely valued by academia, industry and military departments, and it is gradually being used as a backup power supply for electronic instruments, rockets, missiles, artificial satellites, sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/32H01G11/46H01G11/86
CPCY02E60/13
Inventor 陈亚关杰豪甘辉孔令坤陈白珍石西昌
Owner CENT SOUTH UNIV