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Preparation method of graded porous carbon material

A technology of hierarchical porous and carbon materials, applied in lithium-air batteries, containing microporous areas, can solve single problems, and achieve the effect of improving power performance and enhancing mass transfer

Inactive Publication Date: 2016-06-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the pore structure of carbon materials obtained by these methods is often relatively simple. For example, the gas activation method can only control the micropores and small mesopores of carbon materials, and the soft template method can only obtain mesoporous materials with a single pore size. Usually, only the mesoporous and macroporous parts of carbon materials can be regulated by this method.

Method used

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  • Preparation method of graded porous carbon material
  • Preparation method of graded porous carbon material
  • Preparation method of graded porous carbon material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 1.6g of F127 and dissolve it in 8g of ethanol. After the solution is completely clarified, add 1.0g of 0.2M hydrochloric acid, add 2.08g of tetraethyl orthosilicate, 5g of silica microspheres with a particle size of 250nm and 5.0g of mass fraction 20% phenolic resin, stirred at room temperature for 5 hours to form a clear and transparent sol. The sol was placed in a watch glass, and the ethanol was allowed to evaporate naturally to obtain a gel. The gel was dried at 100°C in an air atmosphere for 24 h and then carbonized. The carbonization heating rate is 1°C / min, the temperature is raised to 900°C and kept for 5 hours. The carbonized product is soaked in a hydrofluoric acid solution with a mass fraction of 10% for 24 hours, and then filtered, washed and dried to obtain the final product.

[0022] Take 500mg of this porous carbon material and mix it with 2.5g mass fraction of 5% polytetrafluoroethylene emulsion and 10ml isopropanol to prepare a slurry, then scra...

Embodiment 2

[0024] Weigh 2.4g of P123 and dissolve it in 8g of water. After the solution is completely clarified, add 1.0g of 0.2M hydrochloric acid, add 2.08g of tetraethyl orthosilicate, 6g of polymethyl methacrylate microspheres with a particle size of 200nm and 5.0g of The phenolic resin with a mass fraction of 20% was stirred at room temperature for 5 hours to form a clear and transparent sol. The sol was placed in a watch glass, and the ethanol was allowed to evaporate naturally to obtain a gel. The gel was dried at 100°C in an air atmosphere for 24 h and then carbonized. The carbonization heating rate is 1°C / min, the temperature is raised to 900°C and kept for 5 hours. The carbonized product is soaked in a hydrofluoric acid solution with a mass fraction of 10% for 24 hours, and then filtered, washed and dried to obtain the final product.

[0025] Take 500mg of this porous carbon material and mix it with 2.5g mass fraction of 5% polytetrafluoroethylene emulsion and 10ml isopropano...

Embodiment 3

[0027] Weigh 2.4g P123 and dissolve it in 8g of water. After the solution is completely clarified, add 1.0g of 0.2M hydrochloric acid, add 2.08g of orthosilicate, 4g of calcium carbonate microspheres with a particle size of 100nm, and 10g of calcium carbonate microspheres with a mass fraction of 40%. The sucrose solution was stirred at room temperature for 5 hours to form a clear and transparent sol. The sol was placed in a watch glass, and the watch glass was placed on a hot stage at 40° C. to evaporate the water to obtain a gel. The gel was dried at 100°C in an air atmosphere for 24 h and then carbonized. The carbonization heating rate is 1°C / min, the temperature is raised to 900°C and kept for 5 hours. The carbonized product is soaked and washed in deionized water to remove the calcium oxide component. Then put the carbonized product into a hydrofluoric acid solution with a mass fraction of 10% to soak for 24 hours, and then filter, wash and dry to obtain the final produc...

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Abstract

The invention relates to a preparation method of a graded porous carbon material. The preparation method comprises the following steps: evenly mixing a carbon source precursor, n-ethyl silicate, a soft template agent, a hard template agent, and a dispersant to prepare sol, evaporating the sol to remove the dispersant so as to obtain gel; carbonizing the gel, removing the templates, and pulverizing and grinding the obtained product so as to obtain the carbon material, which is rich in micropores, mesopores, and macropores. Because the carbon material comprises micropores, mesopores, and macropores, when the carbon material is used in an electrochemical device, the abundant micropores and mesopores can supply enough reaction interfaces for electrochemical reactions, at the same time, large mesopores and macropores can be used as mass transfer channels to deliver the reactants, the mass transfer is enhanced, and thus the carbon material is widely used in electrochemical devices.

Description

technical field [0001] The invention belongs to the technical field of carbon material preparation, and in particular relates to a preparation method of a carbon material containing micropores, mesopores, macropores and micron-scale pores, and the application of the material in lithium-air batteries. Background technique [0002] Hierarchical porous carbon material is a new type of carbon material, which has high specific surface area, high pore volume, adjustable pore size distribution, and good processing performance. It has great application prospects in the fields of adsorption, separation, and catalysis. Compared with other porous materials, such as molecular sieves and metal-organic framework materials, porous carbon materials have excellent electrical conductivity, so they have a very wide range of applications in electrochemical devices. In order to obtain carbon materials with suitable pore size distribution, researchers have adopted a variety of methods to control ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 张华民周伟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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