Preparation method of nitrogen-doped porous carbon microsphere

A technology of porous carbon and nitrogen doping, which is applied in the preparation/purification of carbon, the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc. It can solve the problems of low specific capacitance and poor wettability, and achieve high electronegativity, The effect of good wettability and simple and easy preparation process

Inactive Publication Date: 2015-04-08
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the technical problems of poor wettability and low specific capacitance of porous materials in aqueous electrolytes prepared by using nanoparticles as hard templates at present, and provides a method for preparing porous carbon microbeads doped with nitrogen

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  • Preparation method of nitrogen-doped porous carbon microsphere
  • Preparation method of nitrogen-doped porous carbon microsphere
  • Preparation method of nitrogen-doped porous carbon microsphere

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specific Embodiment approach 1

[0020] Specific embodiment one: the present embodiment is a kind of preparation method of nitrogen-doped porous carbon microbead, specifically carries out according to the following steps:

[0021] 1. Mix raw materials to form a solution: mix silica microsphere powder and polyvinylpyrrolidone powder, then add deionized water and stir well to obtain a mixed solution; the silica microsphere powder and polyvinylpyrrolidone powder The quality of each is 0.25g, and the quality of deionized water is 5g;

[0022] 2. Curing and forming: Pour the mixed solution obtained in step 1 into a polypropylene microwave oven box filled with dimethyl silicone oil, stir for 2h to 3h at a temperature of 80°C to 90°C and a rotation speed of 500rpm, and then place it at room temperature Stand still and settle for 12h to 24h to obtain composite microbeads; the volume of the simethicone oil is 500mL;

[0023] 3. Pre-oxidation: the composite microbeads obtained in step 2 are taken out from the polyprop...

specific Embodiment approach 2

[0031] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 2, the mixed solution obtained in step 1 is poured into a polypropylene microwave oven box equipped with simethicone oil, at a temperature of 85°C and a rotating speed of Stirring under the condition of 500rpm for 2.5h, and then settling at room temperature for 20h to obtain composite microbeads. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0032] Specific embodiment three: the difference between this embodiment and one of specific embodiments one to two is that the step-by-step heating described in step 3 is carried out according to the following steps: heating for 10h at a temperature of 100°C, and then heating up to 150° C. and heated at 150° C. for 11 h, then raised to 280° C. and heated at 280° C. for 2.5 h. Others are the same as one of the specific embodiments 1 to 2.

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Abstract

The invention relates to preparation methods of porous carbon microspheres, particularly to a preparation method of a nitrogen-doped porous carbon microsphere. The preparation method of the nitrogen-doped porous carbon microsphere aims at solving the technical problem that, in the prior art, nano particles serve as hard templates to prepare porous materials to result in poor wettability and low specific capacitance in aqueous electrolytes. The method comprises raw material mixing and solution preparation, solidification, preliminary oxidation, calcinations, and silicon dioxide removal. The preparation method of the nitrogen-doped porous carbon microsphere has the advantages that sticking of composite microsphere drops to box bottom and box walls during a high-speed stirring process can be avoided and the ball shape of the composite microsphere drops can be maintained all the time; the small drops in mixed liquid can solidify quickly and evaporation of water in the drops can be accelerated to fix the shape of the drops within a short time; utilized electrolyte solutions achieve high wettability in carbon materials; by preparing the porous carbon microsphere through a hard template method, the specific surface area of the carbon materials can be increased, and the preparation process is simple and easy to implement and can be well applied to electrode materials for super capacitors.

Description

technical field [0001] The invention relates to a preparation method of nitrogen-doped porous carbon microbeads. Background technique [0002] Supercapacitors are a new type of energy device that has emerged in recent years, and the electrode materials in them play a vital role in the technological development of supercapacitors. Among all the electrode materials for supercapacitors, carbon materials are the earliest researched and most mature technology. In recent years, the research on carbon material electrodes has mainly focused on changing its morphology to increase the specific surface area of ​​carbon materials, improving the wettability between the electrode surface and the electrolyte solution, and doping conductive polymer materials. Zhou et al. doped graphene with excellent performance in polyacrylonitrile for electrospinning, and the specific capacitance value of the obtained composite carbon material was as high as 263.7F / g; Wang et al. used in-situ polymerizat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/38H01G11/42H01G11/24C01B31/02
CPCY02E60/13H01G11/86C01B32/05C01P2004/03C01P2004/32C01P2004/61C01P2006/40H01G11/24H01G11/38H01G11/42
Inventor 孙立国藏琳琳孟晨曦汪成张艳红
Owner HEILONGJIANG UNIV
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