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Preparation method of manganese dioxide/carbon-based flexible electrode material

A carbon-based flexible, electrode material technology, applied in the manufacture of hybrid/electric double-layer capacitors, hybrid capacitor electrodes, etc., to achieve the effects of good electrical conductivity, good chemical stability, and low preparation cost

Inactive Publication Date: 2019-12-17
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the present invention provides a method for preparing a manganese dioxide / carbon-based flexible electrode material that is low in preparation cost, simple in process, safe and reliable in operation, does not involve toxic and harmful chemicals, and is suitable for large-scale green development , the preparation method firmly attaches manganese dioxide to the surface of the carbon matrix, which overcomes the defects of poor conductivity and instability of existing electrode materials

Method used

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  • Preparation method of manganese dioxide/carbon-based flexible electrode material
  • Preparation method of manganese dioxide/carbon-based flexible electrode material
  • Preparation method of manganese dioxide/carbon-based flexible electrode material

Examples

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Effect test

Embodiment 1

[0051] (1) Divide 2×2cm 2 The carbon cloth was ultrasonically cleaned with acetone, deionized water, and ethanol for 30 minutes, and dried at 35°C;

[0052] (2) Place the cleaned carbon in a mixed acid solution of concentrated nitric acid:concentrated sulfuric acid=1:3, and immerse in ultrasonic for 30min;

[0053] (3) Potassium permanganate was weighed and dissolved in 30mL deionized water to obtain a solution with a concentration of 20mM. The solution was placed in a beaker and stirred for 20min to completely dissolve it;

[0054] (4) Put the mixed acid-treated carbon cloth into a beaker and ultrasonically treat it for 30 minutes;

[0055] (5) Place the beaker in a water bath and heat it to 85°C for 3 hours;

[0056] (6) Naturally cool the carbon cloth after heat treatment to room temperature, wash it with deionized water and absolute ethanol in sequence, and dry it under vacuum at 60°C for 8 hours to obtain a loading capacity of about 2 mg cm -2 MnO 2 / carbon cloth com...

Embodiment 2

[0059] (1) Divide 2×2cm 2 The carbon felt was ultrasonically cleaned with acetone, deionized water, and ethanol for 90 minutes, and dried at 90°C;

[0060] (2) Place the cleaned carbon felt in a mixed acid solution of concentrated nitric acid:concentrated sulfuric acid=1:1, and immerse in ultrasonic for 30min;

[0061] (3) Dissolve sodium permanganate in 30 mL deionized water to obtain a solution with a concentration of 1000 mM, place the solution in a beaker, and stir for 60 min to completely dissolve it;

[0062] (4) Put the mixed acid-treated carbon felt into a beaker, and ultrasonically treat it for 40 minutes;

[0063] (5) Place the beaker in a water bath and heat it to 90°C for 8 hours;

[0064] (6) Naturally cool the carbon felt to room temperature after heat treatment, wash it with deionized water and absolute ethanol in sequence, and dry it under vacuum at 80°C for 12 hours to obtain a loading capacity of about 4.5 mg cm -2 MnO 2 / Carbon felt composite material, t...

Embodiment 3

[0067] (1) Divide 2×2cm 2 The flexible graphene paper was ultrasonically cleaned with acetone, deionized water, and ethanol for 10 minutes, and dried at 45°C;

[0068] (2) Place the cleaned graphene paper in a mixed acid solution of concentrated nitric acid:concentrated sulfuric acid=1:2, and immerse in ultrasonic for 30min;

[0069] (3) Weigh lithium permanganate and dissolve it in 30mL deionized water to obtain a solution with a concentration of 10mM. The solution is placed in a beaker and stirred for 20min to completely dissolve it;

[0070] (4) Put the graphene paper treated with mixed acid into a beaker, and ultrasonically treat it for 20 minutes;

[0071] (5) Place the beaker in a water bath and heat it to 40°C for 0.5h;

[0072] (6) Naturally cool the graphene paper after heat treatment to room temperature, wash it sequentially with deionized water and absolute ethanol, and dry it in vacuum at 40°C for 4 hours to obtain a loading capacity of about 0.5 mg cm -2 MnO 2...

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Abstract

The invention discloses a preparation method of a manganese dioxide / carbon-based flexible electrode material. The method comprises steps of (1) cleaning and drying a flexible carbon substrate; (2) carrying out dipping acidification treatment of the treated carbon substrate by using mixed acid; wherein the mixed acid is formed by mixing concentrated nitric acid and concentrated sulfuric acid according to the volume ratio of 1:1-1:6; (3) preparing 10-1000mM metal salt aqueous solution, wherein the metal salt is at least one of potassium permanganate, sodium permanganate, lithium permanganate, barium permanganate and zinc permanganate; (4) putting the carbon substrate treated in the (2) into metal salt solution, and carrying out ultrasonic treatment for 20-60 minutes; (5) heating the mixturesubjected to ultrasonic treatment in the (4); and (6) naturally cooling the product subjected to heating treatment to room temperature, washing, and carrying out vacuum drying to obtain the manganesedioxide / carbon-based flexible electrode material. The preparation method is advantaged in that manganese dioxide is firmly attached to a surface of the flexible carbon substrate, can be used for a flexible supercapacitor, and has relatively high specific capacity and good cycling stability.

Description

technical field [0001] The invention relates to a preparation method of a novel manganese dioxide / carbon-based flexible electrode material. Background technique [0002] As an emerging energy storage device, supercapacitors have higher power density, shorter charge and discharge time and longer cycle life than batteries, and have good application prospects. With the development of society and economy, flexible and portable electronic devices will be seen everywhere in human life in the future, so it is of great significance to research and develop high-performance mobile power supplies. Nowadays, how to further improve the quality and volume specific capacitance of the mobile power supply and ensure high energy and power output is the main problem we face. We don't want to carry a bulky mobile power supply to meet our energy needs, so the quality and volume of the mobile power supply will be further miniaturized. After research and development in recent years, flexible ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/32H01G11/36H01G11/40H01G11/46H01G11/86
CPCH01G11/32H01G11/36H01G11/40H01G11/46H01G11/86Y02E60/13
Inventor 苏利伟占静王连邦吴昊郑华均
Owner ZHEJIANG UNIV OF TECH
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