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Nitrogen-doped three-dimensional bicontinuous porous carbon and graphene composite electrode as well as preparation and application thereof

A composite electrode and bi-continuous technology, applied in the field of capacitor electrodes, can solve the problems of poor electrode conductivity, low energy density, and poor cycle performance, and achieve the effects of increasing the contact area, simple preparation, and low cost

Inactive Publication Date: 2020-04-17
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention solves the technical problems of poor electrical conductivity, low energy density and poor cycle performance of capacitor electrodes in the prior art. Nitrogen-doped three-dimensional bicontinuous porous carbon and graphene composite electrode, in which the nitrogen-doped three-dimensional bicontinuous porous carbon with rich pores is of great help to increase the specific capacity, and then compounded with graphene, it can greatly increase the energy density of the supercapacitor

Method used

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  • Nitrogen-doped three-dimensional bicontinuous porous carbon and graphene composite electrode as well as preparation and application thereof
  • Nitrogen-doped three-dimensional bicontinuous porous carbon and graphene composite electrode as well as preparation and application thereof
  • Nitrogen-doped three-dimensional bicontinuous porous carbon and graphene composite electrode as well as preparation and application thereof

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Embodiment 1

[0035] figure 1 It is a process flow diagram for the implementation of the present invention. The preparation of nitrogen-doped three-dimensional double-continuous porous ultra-thin carbon can refer to the Chinese patent publication number CN106517133B. The three-dimensional double-continuous porous ultra-thin carbon is formed by low-temperature pyrolysis of shrimp shells and urea, which can expand to three dimensions. Ultrathin porous carbon with interconnected pores. Mix nitrogen-doped three-dimensional bicontinuous porous ultra-thin carbon with high-conductivity graphene, grind for 10-20 minutes to obtain a uniformly mixed powder, add PVDF to the powder as a binder, and NMP as a solvent, and continue grinding for 20-30 minutes to obtain Premix solution; then evenly coat the premix solution on stainless steel foil, dry at 60°C for 24 hours, and cut into pieces to obtain the final nitrogen-doped three-dimensional double-continuous porous ultra-thin carbon and high-conductivi...

Embodiment 2

[0037] Mix nitrogen-doped three-dimensional bicontinuous porous ultra-thin carbon with high-conductivity graphene, grind for 10-20 minutes to obtain a uniformly mixed powder, add PVDF to the powder as a binder, and NMP as a solvent, and continue grinding for 20-30 minutes to obtain Premix solution; then immerse the pre-cut nickel foam discs in the premix solution for 10-15s, remove, dry at 60°C for 24 hours, and press into tablets to obtain the final nitrogen-doped three-dimensional double continuous porous ultra-thin Electrodes for supercapacitors composited with carbon and high-conductivity graphene. Electrode loadings of 1.5-3 mg / cm were achieved 2 .

Embodiment 3

[0039] Mix nitrogen-doped three-dimensional bicontinuous porous ultra-thin carbon and high-conductivity graphene, and grind for 10-20 minutes to obtain a uniformly mixed powder. Add Nafion to the powder as a binder, and a mixed solution of isopropanol and water as a solvent. Continue Grind for 20-30 minutes to obtain the premix; then evenly coat the premix on stainless steel foil, dry at 60°C for 24 hours, and cut into pieces to obtain the final nitrogen-doped three-dimensional double continuous porous ultra-thin carbon and high-conductivity graphite Alkene-composite supercapacitor electrodes. Obtained electrode loadings of 0.8-1.5 mg / cm 2 .

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Abstract

The invention relates to a nitrogen-doped three-dimensional bicontinuous porous carbon and graphene composite electrode and preparation and application thereof, and belongs to the technical field of capacitor electrodes. The electrode comprises a current collector and a composite material, the composite material is loaded on a surface of the current collector, and the composite material contains nitrogen-doped three-dimensional bicontinuous porous carbon and graphene; nitrogen-doped three-dimensional bicontinuous porous carbon porous carbon particles are used as spacers to avoid re-stacking ofthe graphene and are used for increasing the contact area with the graphene. The preparation method comprises the following steps: mixing the nitrogen-doped three-dimensional bicontinuous porous carbon and the graphene, adding a binder and a solvent, and then coating a current collector, or immersing the current collector in a mixture; and drying to obtain the composite electrode. The electrode of a nitrogen-doped three-dimensional bicontinuous porous ultra-thin carbon and high-conductivity graphene composite super capacitor provided by the invention has excellent conductivity which is higherthan the specific capacity and energy density of a traditional capacitor, good electrochemical cycling stability, simple process, low cost and environmental friendliness.

Description

technical field [0001] The invention belongs to the technical field of capacitor electrodes, and more specifically relates to a composite electrode of nitrogen-doped three-dimensional bicontinuous porous carbon and graphene, as well as its preparation and application. Background technique [0002] In recent years, the contradiction between the increasing energy demand and the increasing shortage of energy resources has become worse and worse, and it is urgent for us to solve it. Therefore, various forms of new energy sources, such as solar energy and wind energy, have begun to enter people's lives. The diversification of energy types is conducive to green and sustainable development. At the same time, improving the level of energy storage and increasing the utilization rate of energy is also a very important way to reduce energy consumption and pollution. [0003] Supercapacitor is a new type of electrochemical energy storage device, which has higher energy density compared...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/36H01G11/86
CPCH01G11/30H01G11/36H01G11/86Y02E60/13
Inventor 常海欣叶添
Owner HUAZHONG UNIV OF SCI & TECH
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