Preparation method of modified activated carbon material for capacitor

A technology of activated carbon and capacitors, which is applied in the field of preparation of modified activated carbon materials, which can solve the problems of material performance degradation, accelerated hydrogen evolution reaction, electrolyte loss of water, etc., and achieve the effect of enhanced performance, wide source of raw materials, and simple preparation method

Active Publication Date: 2020-06-23
ZHEJIANG FORESTRY ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of activated carbon into the above materials will also bring some other problems. For example, in lead-acid batteries, the hydrogen evolution overpotential of activated carbon is lower than that of lead, which will accelerate the hydrogen evolution reaction in the later stage of battery charging, thereby causing the electrolyte to lose water. At the same time The high specific surface activated carbon in the electrode may have side reactions, generate products such as carbon dioxide and carbon monoxide, and consume a large amount of water in the electrolyte, resulting in a decrease in material performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method for a modified activated carbon material for capacitors, comprising the following steps:

[0025] (1) After the rice straw is dedusted by the dedusting equipment, it is sent to the pulverizer for crushing and crushing to a particle size of 40 mesh, and it is used as a raw material for standby;

[0026] (2) Submerge the above-mentioned raw materials in a phosphoric acid solution with a mass concentration of 50%, filter after 12 hours, and then send the carbonized product into a tube furnace for heating and activation. During activation, the temperature is controlled at 400°C and the time is 60 minutes to obtain an activation product;

[0027] (3) After mixing formaldehyde and glycoluril, add sodium hydroxide to adjust the pH to 9, raise the temperature to 45°C, and react for 2 hours. After the product is distilled under reduced pressure, the solution is collected and poured into ethanol, stirred until solids are precipitated, and filtered with suctio...

Embodiment 2

[0030] A preparation method for a modified activated carbon material for capacitors, comprising the following steps:

[0031] (1) After the coconut shell is dedusted by the dedusting equipment, it is sent to the pulverizer to be crushed and crushed to a particle size of 60 mesh, and it is used as a raw material for standby;

[0032] (2) Submerge the above-mentioned raw materials in a phosphoric acid solution with a mass concentration of 50%, filter after 18 hours, and then send the carbonized product into a tube furnace for heating and activation. During activation, the temperature is controlled at 500°C and the time is 60 minutes to obtain an activation product;

[0033] (3) After mixing formaldehyde and glycoluril, add sodium hydroxide to adjust the pH to 10, raise the temperature to 55°C, and react for 1 hour. After the product is distilled under reduced pressure, the solution is collected and poured into ethanol, stirred until solids are precipitated, and filtered with suc...

Embodiment 3

[0036] A preparation method for a modified activated carbon material for capacitors, comprising the following steps:

[0037] (1) After the polyimide film scraps are dedusted by the dust removal equipment, they are sent to the pulverizer to be crushed and crushed to a particle size of 50 mesh, and used as raw materials for later use;

[0038] (2) Submerge the above raw materials in a phosphoric acid solution with a mass concentration of 50%, filter after 15 hours, and then send the carbonized product into a tube furnace for heating and activation. During activation, the temperature is controlled at 450°C and the time is 75 minutes to obtain an activation product;

[0039] (3) After mixing formaldehyde and glycoluril, add sodium hydroxide to adjust the pH to 9, raise the temperature to 50°C, and react for 1.5 hours. After the product is distilled under reduced pressure, the solution is collected and poured into ethanol, stirred until solids are precipitated, and filtered with s...

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PUM

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Abstract

The invention discloses a preparation method of a modified activated carbon material for a capacitor. The preparation method comprises the following steps: (1) polishing, drying and crushing a carbonsource; (2) activating the raw materials through a phosphoric acid solution to obtain a primary activated product; (3) mixing the precursor powder with the primary activation product, and activating with potassium hydroxide to obtain a secondary activation product; and (4) adding the secondary activation product into a saturated lead nitrate solution, carrying out ultrasonic dispersion, stirring and performing vacuum filtration to obtain a filter cake, and carrying out heat treatment to obtain the material. The preparation method of the activated carbon is simple; the preparation method is simple in process, wide in raw material source and suitable for large-scale production, a secondary activation process is adopted in the preparation process, precursor powder with high content of heteroatoms such as nitrogen and oxygen is added into the activated carbon, the specific surface area is further increased, micropores are enriched in the surface, the specific capacitance of the material isimproved, and the use performance of the material is enhanced.

Description

technical field [0001] The invention belongs to the technical field of activated carbon materials, in particular to a method for preparing a modified activated carbon material used in capacitors. Background technique [0002] Activated carbon, also known as activated carbon, refers to an amorphous carbonaceous material with high porosity and large specific surface area (ie, surface area per unit mass). It is usually manufactured by pyrolysis of different carbonaceous substances followed by activation by physical or chemical processes, and it can exist in many different forms such as granules, powder, fibrous material, cloth, etc. Activated carbons have been widely used in industrial fields, such as electrode materials for supercapacitors, as adsorbents for water and gas purification, and as inorganic metals due to their good porosity, high specific surface area, and good thermal and chemical stability. catalyst or catalyst support. With the development of society and the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/342C01B32/324C01B32/354H01G11/24H01G11/34H01G11/44
CPCC01B32/348C01B32/342C01B32/324C01B32/354H01G11/34H01G11/44H01G11/24Y02E60/13
Inventor 蒋应梯庄晓伟潘炘王进于海霞张文福
Owner ZHEJIANG FORESTRY ACAD
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