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Porous carbon material with graphitized structure, and preparation method and application of porous carbon material

A porous carbon material and graphitization technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems affecting the rate performance of electrode materials, restricting rapid electron transport, and unfavorable large-scale applications, and improve energy storage. effect, reduced manufacturing cost, high specific capacitance

Inactive Publication Date: 2019-01-29
XI AN JIAOTONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, most of the currently prepared porous carbon materials exist in the form of disordered or amorphous structures, which limits the rapid transport of electrons in them to a certain extent, and thus affects the rate performance of electrode materials.
In addition, the preparation of such porous carbon materials usually has problems such as low carbon residue rate, high cost, and time-consuming preparation process, which is not conducive to large-scale application.

Method used

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  • Porous carbon material with graphitized structure, and preparation method and application of porous carbon material
  • Porous carbon material with graphitized structure, and preparation method and application of porous carbon material
  • Porous carbon material with graphitized structure, and preparation method and application of porous carbon material

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preparation example Construction

[0028] The preparation method of the porous carbon material with graphitized structure of the present invention comprises the following steps:

[0029] Step 1: crush the solid residue produced in the process of petroleum or coal chemical industry, add it into a mortar, and grind it into powder; then, add a certain amount of catalyst and alkaline activator respectively, and mix well to obtain a mixture. The catalyst is metal oxide or metal hydroxide, and the metal element in the catalyst is one or more of iron, cobalt, magnesium and aluminum elements; the alkaline activator is one of potassium hydroxide and sodium hydroxide. The mass ratio of the solid residue to the catalyst is 1:(1-10), and the mass ratio of the solid residue to the alkaline activator is 1:(1-5).

[0030] Step 2, transfer the mixture obtained in step 1 to an inert atmosphere high-temperature tube furnace, raise the temperature to 120°C to 250°C and keep it for 0.5 to 1 hour, then heat it to 700°C to 1200°C an...

Embodiment 1

[0034] (1) Crushing 1 g of solid residue generated during coal processing, adding it to a mortar, and grinding it into powder. Subsequently, 1 g of magnesium hydroxide and 1 g of potassium hydroxide were added respectively, and mixed well.

[0035] (2) Transfer the mixture in step (1) to a high-temperature tube furnace in a nitrogen atmosphere, keep it at 120°C for 0.5 hours, then heat it to 700°C for 3 hours, the heating rate is 2°C / min, and cool naturally to room temperature.

[0036] (3) The product obtained in step (2) is taken out, ground and crushed, washed with acid and deionized water until neutral, dried, and ground to obtain a porous carbon material with a graphitized structure.

Embodiment 2

[0038] (1) Crushing 1 g of solid residue generated during coal processing, adding it to a mortar, and grinding it into powder. Subsequently, 2 g of magnesium-aluminum composite oxide and 1 g of potassium hydroxide were respectively added and mixed well.

[0039] (2) Transfer the mixture in step (1) to a high-temperature tube furnace in a nitrogen atmosphere, keep it at 120°C for 0.5 hours, then heat it to 700°C for 3 hours, the heating rate is 2°C / min, and cool naturally to room temperature.

[0040] (3) The product obtained in step (2) is taken out, ground and crushed, washed with acid and deionized water until neutral, dried, and ground to obtain a porous carbon material with a graphitized structure.

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Abstract

The invention provides a porous carbon material with a graphitized structure, and a preparation method and application of the porous carbon material. A carbon source is fully and uniformly mixed witha catalyst and an alkaline activator, and the porous carbon material with the graphitized structure is obtained through heat treatment, wherein the catalyst is a metal oxide or a metal hydroxide. According to the invention, the metal oxide or the metal hydroxide is adopted as the catalyst for catalytic graphitization, the carbon source can be uniformly dispersed on the surface of the catalyst, carbonization of the carbon material is facilitated through a high-temperature carbonization process, and conductivity of the carbon material and the utilization rate of the catalyst are improved. Meanwhile, the metal oxide or the metal hydroxide can promote the carbon source to form a porous structure in a heat treatment process, so that the specific surface area is increased. The prepared porous carbon material with the graphitized structure serves as an electrode material of supercapacitors, and has the advantages of high specific capacitance, good rate capability, long cycle life and the like.

Description

technical field [0001] The invention belongs to the technical field of carbon material preparation and new energy, and relates to a porous carbon material with a graphitized structure and a preparation method and application thereof. Background technique [0002] Due to the outstanding advantages of high conductivity, stable structure, low price, and environmental protection, nano-carbon materials have shown broad application prospects in the fields of energy, chemical industry, and environment. Especially in the energy storage of new energy devices such as supercapacitors and lithium-ion batteries, nano-carbon materials play an important role as electrode materials. The commonly used nano-carbon materials are mainly porous activated carbon, which is also the most widely used commercial electrode material. This type of carbon material has an ultra-high specific surface area and porosity, which can effectively enhance the adsorption and desorption process of electrolyte ions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205H01G11/24H01G11/44H01G11/86
CPCC01B32/205H01G11/24H01G11/44H01G11/86Y02E60/13
Inventor 杨卷邱介山王宁波王满胡超王汝成
Owner XI AN JIAOTONG UNIV
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