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Preparation method of interconnected layered porous carbon material for supercapacitor

A technology of supercapacitors and porous structures, which is applied in the manufacture of hybrid/electric double layer capacitors and electrodes of hybrid capacitors. It can solve the problems of high production costs, dead pores that cannot be connected to each other, and complicated preparation processes, and achieve high rate performance. Conducive to ion diffusion and simple preparation process

Active Publication Date: 2018-12-07
HEFEI UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of high production cost, complex preparation process and a large number of dead pores that cannot be connected with each other in the preparation process of the existing hierarchical porous structure carbon materials, the present invention provides an interconnected hierarchical structure for supercapacitors. Preparation method of porous structure carbon material

Method used

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  • Preparation method of interconnected layered porous carbon material for supercapacitor
  • Preparation method of interconnected layered porous carbon material for supercapacitor
  • Preparation method of interconnected layered porous carbon material for supercapacitor

Examples

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Effect test

Embodiment 1

[0033] A kind of preparation operation steps of interconnected layered porous structure carbon material for supercapacitor is as follows:

[0034] (1) Take the egg shell from which the egg white, egg yolk and egg film have been removed, heat-treat it in the air at 350°C for 3 hours, and the heating rate is 1°C / min, and then grind the obtained egg shell into a fine powder, The egg shell powder is obtained, and passed through a 40-mesh sieve.

[0035] (2) Add 2 g of egg shell powder and 4 g of agar powder into 80 ml of 5% polyvinylpyrrolidone aqueous solution, mix evenly at 85° C., and dry to obtain a mixture of egg shell and agar.

[0036] (3) In an inert atmosphere, carbonize the obtained mixture at a temperature of 900° C. for 2 hours to obtain carbides.

[0037] (4), pickling, washing and drying the carbides to obtain the interconnected layered porous structure carbon material of the present invention, see figure 1 .

[0038] Carry out X-ray powder diffraction test on egg...

Embodiment 1

[0040] Carry out transmission electron microscope test to the carbon material that embodiment 1 makes, its test result is as follows Figure 4 As shown, it can be concluded from the figure that the prepared carbon material has a hierarchical porous structure.

[0041] The carbon material prepared in Example 1 was subjected to nitrogen adsorption and desorption experiments, and the test results showed that its specific surface area was 249 m 2 g -1 .

[0042] The carbon material prepared in Example 1 was subjected to an elemental analysis test, and the test result showed that its nitrogen content was 4.1%.

[0043] Electrochemical performance test:

[0044] The interconnected hierarchical porous carbon material prepared above is made into an electrode, and the electrochemical performance is tested. The specific process is as follows:

[0045] Weigh the active material, graphite, acetylene black, PVDF according to the mass percentage of 70:10:10:10, put them together and gr...

Embodiment 2

[0048] A kind of preparation operation steps of interconnected layered porous structure carbon material for supercapacitor is as follows:

[0049] (1) Take the egg shell from which the egg white, egg yolk and egg film have been removed, heat-treat it in the air at 350°C for 3 hours, and the heating rate is 1°C / min, and then grind the obtained egg shell into a fine powder, The egg shell powder is obtained, and passed through a 40-mesh sieve.

[0050] (2) Add 4 g of egg shell powder and 4 g of agar powder into 80 ml of 5% polyvinylpyrrolidone aqueous solution, mix evenly at 85° C., and dry to obtain a mixture of egg shell and agar.

[0051] (3) In an inert atmosphere, carbonize the obtained mixture at a temperature of 900° C. for 2 hours to obtain carbides.

[0052] (4) Carbide is pickled, washed and dried to obtain the interconnected hierarchical porous structure carbon material described in the present invention.

[0053] The carbon material prepared in Example 2 was subjected...

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Abstract

The invention provides a preparation method of interconnected layered porous carbon material for a supercapacitor. The eggshell acts as the template, the agar acts as the carbon source and the polyvinylpyrrolidone acts as the nitrogen source. Firstly the eggshell and the agar are uniformly mixed in the polyvinylpyrrolidone aqueous solution of certain concentration. Then the heat of the obtained mixture is preserved for 1-3h under the temperature of 800-1000 DEG C in the inert atmosphere and then acid pickling, washing and drying are performed so that the interconnected layered porous carbon material is obtained. The eggshell membrane of the eggshell is removed, the main component is calcium carbonate and the eggshell has a porous structure. The eggshell decomposes under certain temperatureto produce carbon dioxide, the carbon dioxide activates the carbon material to form a large number of micropores in the carbon material and connect large pores and mesopores so as to form the interconnected layered porous carbon material. When the carbon material is used as the electrode material of the supercapacitor, the carbon material has excellent electrochemical cyclic stability.

Description

technical field [0001] The invention belongs to the field of preparation and application of carbon materials, more specifically, to a preparation method of interconnected layered porous structure carbon materials and its application in supercapacitors. Background technique [0002] Due to their large specific surface area, low density, high chemical stability, and good electrical and thermal conductivity, porous carbon materials are widely used in the fields of adsorption and energy storage. Porous carbon materials are generally prepared by physical activation, chemical activation and template method. Physical activation usually refers to high-temperature treatment of carbon precursors in an oxidizing atmosphere (such as water vapor, carbon dioxide); chemical activation usually refers to the presence of activators (phosphoric acid, potassium hydroxide, and zinc chloride, etc.) The carbon precursor is subjected to high-temperature treatment; the template method refers to mix...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/44H01G11/30H01G11/86
CPCH01G11/24H01G11/30H01G11/44H01G11/86Y02E60/13
Inventor 孙振杰蒋阳王文杰张家民廖江寒王冠初王凯
Owner HEFEI UNIV OF TECH
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