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Preparation method of hierarchical pore carbon foam used for supercapacitor electrode

A technology of supercapacitor and graded porous carbon, which is applied in the preparation/purification of carbon, can solve the problems of difficulty in meeting the requirements of supercapacitors, lack of macropores, etc., and achieve the effect of improving high-current charge-discharge performance and excellent electrochemical performance.

Inactive Publication Date: 2013-12-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a lack of macropores in this material. Because macropores are conducive to the rapid entry of electrolyte ions into the pores of the electrode material, the above-mentioned hierarchical porous carbon electrode materials still have difficulty in meeting the requirements of supercapacitors for high-current charging and discharging.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First take formaldehyde: resorcinol: silica nanoparticles: water = 1:1:0.1:0.5 parts by mass, and mix uniformly as the water phase; liquid paraffin is the oil phase, Span 80 and Tween 80 As an emulsifier. According to Span 80: Tween 80: oil phase: water phase = 2: 3: 8: 15 parts by mass, the water phase is added to the oil phase under stirring conditions, and an emulsifier is added, and the stirring speed is 400r / min, after stirring for 20 min, an oil-in-water emulsion was obtained. Add catalyst NaOH to the prepared oil-in-water emulsion to polymerize and solidify resorcinol and formaldehyde. After the whole emulsion is solidified, a solidified body filled with oil phase is obtained. The solidified body is dried at 40°C for 24 hours. In a tube furnace, under a nitrogen protection environment, the dried cured body was heated from room temperature to 700 °C for carbonization at a heating rate of 0.5 °C / min, and then cooled down to room temperature naturally. The silica...

Embodiment 2

[0025] First take formaldehyde: resorcinol: silica nanoparticles: water = 1:1.2:0.2:1 in parts by mass, and mix uniformly as the water phase; liquid paraffin is the oil phase, Span 80, Tween 80 As an emulsifier. Take according to Span 80: Tween 80: oil phase: water phase = 2: 3: 10: 20 parts by mass, add the water phase to the oil phase under stirring conditions, and add emulsifier, the stirring speed is 800r / min, after stirring for 40 min, an oil-in-water emulsion was obtained. In the prepared oil-in-water emulsion, catalyst HCl was added to polymerize and solidify resorcinol and formaldehyde. After the whole emulsion solidified, a cured body filled with oil phase was obtained, and the obtained cured body was dried at 60°C for 12 hours. In a tube furnace, under a nitrogen protection environment, the dried cured body was heated from room temperature to 800 °C for carbonization at a heating rate of 2 °C / min, and then cooled down to room temperature naturally. The silica nano...

Embodiment 3

[0027]First take formaldehyde: resorcinol: silica nanoparticles: water = 1:1.4:0.3:2 parts by mass, and mix uniformly as the water phase; liquid paraffin is the oil phase, Span 80, Tween 80 As an emulsifier. Take according to Span 80: Tween 80: oil phase: water phase = 2: 3: 15: 25 parts by mass, add the water phase to the oil phase under stirring conditions, and add emulsifier, the stirring speed is 1500r / min, after stirring for 60 min, an oil-in-water emulsion was obtained. In the prepared oil-in-water emulsion, add catalyst NaOH or HCl to polymerize and solidify resorcinol and formaldehyde. After the whole emulsion is solidified, a solidified body filled with oil phase is obtained, and the solidified solidified body is dried at 80°C for 8 hours. . In a tube furnace, under a nitrogen protection environment, the dried cured body was heated from room temperature to 900 °C for carbonization at a heating rate of 5 °C / min, and then cooled down to room temperature naturally. T...

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Abstract

The invention relates to a preparation method of a hierarchical pore carbon foam used for a supercapacitor electrode. The method comprises: firstly taking formaldehyde, resorcinol, silicon dioxide nanoparticles and water according to a mass ratio of 1:1-2:0.1-1:0.5-10, mixing them uniformly and taking the mixture as a water phase; adopting liquid paraffin as an oil phase, using Span 80 and Tween 80 as emulsifiers, weighing Span 80, Tween 80, the oil phase and the water phase according to a mass ratio of 2:3:8-20:15-30, mixing the water phase, the oil phase and the emulsifiers under stirring to obtain an oil-in-water type emulsion, adding a catalyst to solidify make the emulsion, conducting drying, then performing high temperature carbonization, removing the silicon dioxide nanoparticles from the carbonized material by dissolution in an HF solution with a mass percent of 40%, thus obtaining carbon foam, mixing the carbon foam with KOH in a mass ratio of 3-7:1, then conducting activation at 800-1000DEG C, thus obtaining the hierarchical pore carbon foam. When the hierarchical pore carbon foam provided in the invention is used as a supercapacitor electrode, high specific capacitance can be effectively maintained, and simultaneously the large current charge-discharge performance of the electrode can be improved.

Description

technical field [0001] The invention relates to a method for preparing a hierarchical porous carbon foam used for supercapacitor electrodes. It belongs to the field of material technology. Background technique [0002] Supercapacitor is a new type of energy storage device between traditional capacitors and batteries. It has the characteristics of environmental friendliness, long cycle life and high safety. Therefore, supercapacitors have broad and important application prospects in consumer electronics, data memory storage systems, electric vehicle power supplies, and emergency backup power supplies. Activated carbon is currently the most widely used electrode material in supercapacitors due to its high specific surface area and relatively low cost. For example, "Preparation method of shaped activated carbon electrode with high specific capacitance" (Chinese invention patent, patent number: 02130063.1), and "Preparation method of activated carbon for biomass-based supercap...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B32/05
Inventor 刘明贤甘礼华李洋
Owner TONGJI UNIV
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