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Preparation method of carbon foam with high electrochemical performances

A carbon foam and electrochemical technology, applied in the field of carbon foam preparation, can solve the problems of low electrical conductivity and unsatisfactory electrochemical performance, and achieve the effects of improving electrical conductivity, good charge-discharge cycle performance, and improving wetting performance

Inactive Publication Date: 2011-05-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to disclose a method for preparing carbon foam. The carbon foam prepared by the method of the present invention has good wettability to the electrolyte solution, and can make full use of its pore surface for charge storage. Therefore, whether it is used as a battery electrode or a capacitor Electrodes can overcome the shortcomings of the existing carbon foams, such as low electrical conductivity and unsatisfactory electrochemical performance caused by the relative inertness of surface carbon atoms, and contribute to the practical application of carbon foams in the field of electrochemical capacitor electrode materials, and the quality is stable ,Simple process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] According to phenol: formaldehyde: sodium metavanadate: EO 20 PO 70 EO 20 : sodium hydroxide: absolute ethanol = 1: 1: 0.01: 1: 0.01: 100 by weight, and mixed uniformly to obtain a carbon foam precursor solution. The obtained carbon foam precursor solution was placed in an environment of 15° C. to completely evaporate the solvent to obtain a solid carbon foam precursor. The obtained solid carbon foam precursor was cured at 100°C for 24h, and then carbonized at 600°C for 10h under the protection of a nitrogen atmosphere at a heating rate of 1°C / min to obtain a carbon foam. EO 20 PO 70 EO 20 It is a reagent-grade product purchased from Sigma-Aldrich Company of the United States, and other raw materials are commercially available.

[0016] Take the above-mentioned carbon foam by mass ratio: 12wt% polytetrafluoroethylene emulsion (purchased from Shanghai Sanaifu New Material Co., Ltd.): dehydrated alcohol=90:10:50, after mixing evenly, dry under the infrared lamp , t...

Embodiment 2

[0019] According to phenol: formaldehyde: sodium metavanadate: EO 20 PO 70 EO 20 : sodium hydroxide: absolute ethanol = 1: 4: 0.03: 2: 0.03: 100 mass ratio ratio weighed, mixed evenly to obtain a carbon foam precursor solution. The obtained carbon foam precursor solution was placed in an environment of 30° C. to evaporate the solvent to obtain a solid carbon foam precursor. The obtained solid carbon foam precursor was cured at 100°C for 12 hours, and then carbonized at 700°C for 5 hours at a rate of 30°C / min under the protection of a nitrogen atmosphere to obtain a carbon foam.

[0020] According to the method of Example 1, the carbon foam was used to make an electrode, and assembled into an electrochemical capacitor in a 7mol / L KOH solution. Under the condition that the current density is 100mA / g, the mass specific capacitance of the carbon foam material is increased by more than 5% compared with the carbon foam without vanadate; The mass specific capacitance of the carbo...

Embodiment 3

[0022] According to phenol: formaldehyde: sodium metavanadate: EO 106 PO 70 EO 106 : sodium hydroxide: absolute ethanol = 1: 0.6: 0.05: 2: 0.05: 100 mass ratio ratio weighed, mixed evenly to obtain a carbon foam precursor solution. The obtained carbon foam precursor solution was placed in an environment of 30° C. to evaporate the solvent to obtain a solid carbon foam precursor. The obtained solid carbon foam precursor was cured at 100°C for 12h, and then carbonized at 950°C for 3h at a rate of 60°C / min under the protection of a nitrogen atmosphere to obtain a carbon foam.

[0023] EO 106 PO 70 EO 106 It is a reagent-grade product purchased from Sigma-Aldrich Company of the United States, and other raw materials are commercially available.

[0024] According to the method of Example 1, the electrode made of this carbon foam was assembled into an electrochemical capacitor in a 7mol / L KOH solution. Under the condition that the current density is 100mA / g, the mass specific ...

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Abstract

The invention relates to a preparation method of carbon foam with high electrochemical performances, comprising the following steps of: firstly, weighing phenol formaldehyde, vanadate, surface active agent, sodium hydroxide and solvent according to mass ratio of 1:(0.6-4):(0.01-0.5):(1-20):(0.01-0.5):100, mixing uniformly and obtaining precursor solution of the carbon foam; putting the obtained solution into an environment with the temperature of 15 DEG C-60 DEG C to lead the solvent to be completely volatilized, and obtaining precursor of solid carbon foam; and solidifying the precursor of the solid carbon foam for 1 hour-24 hours at the temperature of 100 DEG C-200 DEG C, then rising the temperature to be 600 DEG C-1400 DEG C at the temperature rising speed of 1 DEG C / min-60 DEG C / min under the inert atmosphere, carbonizing for 0.5 hour-10 hours, and obtaining the carbon foam with high electrochemical performances. In the preparation method, the technology is simple, the quality is stable, vanadate introduced when the precursor solution of the carbon foam is prepared is converted into sodium vanadate nanocrystalline with a stable layer structure in the process of carbonization, and the obtained sodium vanadate nanocrystalline is embedded into a carbon foam skeleton uniformly. Compared with the existing carbon foam, the prepared carbon foam has the electrochemical performances such as high mass specific capacitance, good charging and discharging circulation and the like, and can be effectively applied in the fields such as electrode materials of electrochemical capacitors and the like.

Description

technical field [0001] The invention relates to a method for preparing carbon foam with high electrochemical performance, in particular embedding sodium vanadate nanocrystals in the framework of carbon foam to improve the electrochemical performance of carbon foam. The electrochemical performance of the carbon foam prepared by the method of the invention is obviously improved. Background technique [0002] Carbon foam is a solid material with low density, high porosity and high specific surface area with network structure. Carbon foam reported at home and abroad has the characteristics of high specific surface area, good corrosion resistance, thermal stability and flexibility, and highly open pore structure, which is a very promising electrode material. The title of the invention is "Carbon Foam and Its Preparation Method" (Chinese Invention Patent, Patent No.: ZL 01816023.9) discloses a method for the preparation of carbon foam, and describes the introduction of this carbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 甘礼华吕耀康刘明贤曹永杰陈龙武
Owner TONGJI UNIV
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