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Hierarchical secondary porous carbon airgel material, supercapacitor electrode material and preparation method

A technology of carbon airgel and graphene airgel, which is applied in the fields of hybrid capacitor electrode, hybrid/electric double layer capacitor manufacturing, carbon preparation/purification, etc. Problems such as poor compounding of components, to achieve the effect of good conductivity, rich pores, and excellent cycle stability

Active Publication Date: 2021-02-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the limitations of graphene airgel and ZIF-8 derived carbon in the application of supercapacitors, the present invention attempts to construct a three-dimensional graphene airgel-ZIF-8 derived carbon composite material, but it is difficult to shape the composite material and the components Poor compounding or the expected performance (porous structure, electrical conductivity, etc.) after molding is difficult to guarantee

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  • Hierarchical secondary porous carbon airgel material, supercapacitor electrode material and preparation method
  • Hierarchical secondary porous carbon airgel material, supercapacitor electrode material and preparation method
  • Hierarchical secondary porous carbon airgel material, supercapacitor electrode material and preparation method

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Embodiment 1

[0043] (1) Preparation of graphene airgel: disperse graphene oxide and ascorbic acid in water, form a uniform dispersion after ultrasonication, prepare graphene hydrogel after hydrothermal reaction, and obtain graphene airgel after washing and freeze-drying. gel. The mass concentration of graphene oxide is 1g L -1 , the mass ratio of ascorbic acid to graphene oxide is 10:1. The hydrothermal reaction temperature is 95°C, and the reduction time is 60 minutes;

[0044] (2) immersion concentration of the graphene airgel gained in step (1) is 10g L -1 In the methanol solution of zinc nitrate hexahydrate, let it stand at room temperature for 10h, then take it out and immerse it in a concentration of 15g L at room temperature -1 In the methanol solution of dimethylimidazole, let stand for 10h, carry out 4 circulations of above-mentioned operation alternately, obtain graphene airgel-ZIF-8 pre-composite material after washing and freeze-drying.

[0045] (3) Place the graphene airge...

Embodiment 2

[0049] (1) Preparation of graphene airgel: disperse graphene oxide and ascorbic acid in water, form a uniform dispersion after ultrasonication, prepare graphene hydrogel after hydrothermal reaction, and obtain graphene airgel after washing and freeze-drying. gel. The mass concentration of graphene oxide is 0.5g L -1 , the mass ratio of ascorbic acid to graphene oxide is 10:1. The hydrothermal reaction temperature is 90°C, and the reduction time is 30 minutes;

[0050] (2) immersion concentration of the graphene airgel gained in step (1) is 10g L -1 In the methanol solution of zinc nitrate hexahydrate, let it stand at room temperature for 10h, then take it out and immerse it in a concentration of 15g L at room temperature -1 In the methanol solution of dimethylimidazole, let stand for 10h, carry out 6 cycles of above-mentioned operations alternately, obtain graphene airgel-ZIF-8 pre-composite material after washing and freeze-drying.

[0051] (3) Place the graphene airgel-Z...

Embodiment 3

[0055] (1) Preparation of graphene airgel: disperse graphene oxide and ascorbic acid in water, form a uniform dispersion after ultrasonication, prepare graphene hydrogel after hydrothermal reaction, and obtain graphene airgel after washing and freeze-drying. gel. The mass concentration of graphene oxide is 0.5g L -1 , the mass ratio of ascorbic acid to graphene oxide is 10:1. The hydrothermal reaction temperature is 95°C, and the reduction time is 60 minutes;

[0056] (2) immersion concentration of the graphene airgel gained in step (1) is 10g L -1 In the methanol solution of zinc nitrate hexahydrate, let it stand at room temperature for 10h, then take it out and immerse it in a concentration of 15g L at room temperature -1 In the methanol solution of dimethylimidazole, let stand for 10h, carry out 2 cycles of above-mentioned operations alternately, obtain graphene airgel-ZIF-8 pre-composite material after washing and freeze-drying.

[0057] (3) Place the graphene airgel-Z...

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Abstract

The invention relates to the field of capacitor preparation, in particular to a multi-level secondary porous carbon airgel material, a supercapacitor electrode material and a preparation method. The multi-level secondary porous carbon airgel material is based on graphene airgel, and ZIF-8 derived carbon is a modified particle; wherein, the mass ratio of ZIF-8 derived carbon to graphene airgel is 2:1 ~6:1, the nitrogen content of the ZIF‑8 derived carbon is 5%~15%, and the diameter is 0.6~1.2 μm. The invention combines the advantages of graphene airgel and metal-organic framework ZIF-8 derived carbon, overcomes the technical defects in the pore structure and surface functionalization of the current electrode materials for supercapacitors, and the material has micropores-mesopores-large The multi-level sub-porous structure of the pores and the uniform distribution of nitrogen doping, as well as the advantages of rich pores, good electrical conductivity, and electric double layer capacitance-pseudocapacitance, are promising electrode materials for supercapacitors.

Description

technical field [0001] The invention relates to the field of capacitor preparation, in particular to a multi-level secondary porous carbon airgel material, a supercapacitor electrode material and a preparation method. Background technique [0002] With the continuous development of the economy, the demand for high-performance energy storage devices in human society is increasing. Supercapacitors have attracted more and more attention due to their advantages such as large capacity, fast charging speed, and long cycle life. According to different charge storage processes, supercapacitors can be divided into faradaic pseudocapacitors and electrochemical double layer capacitors. Pseudocapacitors store electrical energy through redox reactions of electrode materials. Although pseudocapacitor materials have high specific capacitance, their rate stability and long-term cycle performance are often not ideal. In an electric double layer capacitor, charges are adsorbed on the surface...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/30H01G11/32H01G11/36H01G11/26H01G11/24H01G11/86C01B32/05
CPCC01B32/05H01G11/24H01G11/26H01G11/30H01G11/32H01G11/36H01G11/86Y02E60/13
Inventor 韩冰王云楷王祥科
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)