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Preparation method of carbon electrode material with gradation pore structure for supercapacitor

A technology of supercapacitors and hierarchical pores, applied in capacitors, electrolytic capacitors, circuits, etc., can solve complex problems and achieve the effects of developed hierarchical pore structure, simple method, and high specific surface area

Inactive Publication Date: 2012-11-28
NO 63971 TROOPS PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are relatively complicated. The removal of silicon templates requires the use of highly corrosive hydrofluoric acid, and high-temperature chlorination also presents challenges in ensuring safety and environmental protection.

Method used

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  • Preparation method of carbon electrode material with gradation pore structure for supercapacitor
  • Preparation method of carbon electrode material with gradation pore structure for supercapacitor
  • Preparation method of carbon electrode material with gradation pore structure for supercapacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Add 100g of powdered PVDF to 500mL of 80% KOH solution, stir to mix evenly, put it into a tube furnace protected by an argon atmosphere, heat at 2°C / min to 150°C for 2 hours, then raise the temperature to 800°C ℃ constant temperature activation 3h. Take it out after slowly cooling down to room temperature, add dilute sulfuric acid to neutralize excess KOH, and then wash with pure water to neutrality to obtain a hierarchical pore structure carbon material with a high specific surface area.

[0026] Depend on figure 1 The nitrogen absorption / desorption curve of the obtained carbon material shown in the calculation shows that its BET specific surface area is 2811m 2 / g. Depend on figure 2 The pore size distribution curve of the obtained carbon material shows that it contains abundant micropores of 0.5-2nm and mesopores of 2-50nm, and the pore volume of the micropores is 0.669cm 3 / g, the mesopore volume is 1.945cm 3 / g. The pore volume of the large pores measured by...

Embodiment 2

[0029] The PVDC was crushed to a particle size of ≤100 μm, mixed evenly with NaOH at a mass ratio of 1:3, placed in an argon-protected muffle furnace, and heated to 700°C for activation at a constant temperature for 5 hours. After slowly cooling down to room temperature, take it out, add ethylene hydrochloric acid to neutralize excess NaOH, and then wash with pure water until neutral to obtain a hierarchical pore structure carbon material with a high specific surface area.

[0030] The BET specific surface area of ​​the obtained carbon material is 2516m 2 / g, micropore volume 0.735cm 3 / g, mesopore volume 1.335cm 3 / g, the large pore volume measured by mercury porosimetry is 3.22cm 3 / g, the specific capacity at 50mA / g current density in 6M KOH electrolyte is 355F / g, and the specific capacity at 50Ag current density maintains 205F / g; in organic electrolyte 1M Et 4 NBF 4 The specific capacitance in / PC is 160F / g, and the specific capacitance still maintains 124F / g under the...

Embodiment 3

[0032] Powder PVDF and Mg(OH) 2 and Ca(OH) 2 Mix evenly at a mass ratio of 1:3:4, place in the center of a tubular resistance furnace, pass through high-purity nitrogen protection, and heat to 900°C for 8 hours. After the furnace temperature dropped to room temperature, it was taken out, an excess of nitric acid was added, and then washed with pure water to neutrality to obtain a carbon material with a hierarchical pore structure with a high specific surface area.

[0033]The BET specific surface area of ​​carbon materials measured by nitrogen adsorption method is 2018m 2 / g, micropore volume 0.861cm 3 / g, mesopore volume 0.882cm 3 / g, the large pore volume measured by mercury intrusion porosimetry is 2.23cm 3 / g, the specific capacity at 50mA / g current density in 6M KOH electrolyte is 315F / g, and the specific capacitance at 50A / g current density maintains 189F / g; in organic electrolyte 1M Et 4 NBF 4 The specific capacitance in / PC is 156F / g, and the specific capacitance...

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Abstract

The invention discloses a preparation method of a carbon electrode material with a gradation pore structure for a supercapacitor, belonging to the field of new energy materials. The preparation method comprises the following steps that: polyvinylidene fluoride or polyvinylidene chloride is taken as a carbon precursor, strong base is taken as an activating agent, and splitting gas (HF and HCl) is taken as an absorbing agent, the carbon precursor and the strong base are mixed uniformly, and further carbonized and activated under high temperature to obtain a carbon material with an advanced gradation pore structure, wherein the gradation pore includes a micropore, a mesopore and macropore, aqueous solution electrolyte and organic electrolyte have the properties of high specific capacitance and obvious large current. The method has the advantages of simplicity, environmental protection, easy industrialization and the like. The carbon material is an ideal electrode material of the supercapacitor and also can be used for the fields of electrostatic desalination, catalysis, absorption, gas storage and the like.

Description

technical field [0001] The invention relates to a preparation method of a hierarchical pore structure carbon electrode material for a supercapacitor, belonging to the field of new energy materials. Background technique [0002] Supercapacitor is a new type of energy storage device with high power and long life, which is widely used in electric vehicles, uninterruptible power supply, aerospace, mobile communication and military and other fields. In supercapacitors, carbon electrode materials are key. The specific surface and pore structure are the main parameters that determine the electrochemical capacitive performance of carbon electrode materials. An ideal carbon electrode material should have both high specific capacity and excellent high-current power performance. In pursuit of high specific capacity, microporous (<2nm) carbon materials with high specific surface area are the first choice. To obtain excellent high-current performance, the pore diameters of the meso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/058
CPCY02E60/13
Inventor 徐斌郑冬芳侯珊珊曹高萍张浩杨裕生
Owner NO 63971 TROOPS PLA
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