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Mesoporous carbon material, carbon/metal oxide composite materials, and electrochemical capacitors using them

A technology of composite materials and oxides, applied in the direction of electrolytic capacitors, hybrid capacitor electrodes, hybrid capacitor separators, etc., can solve the problems of limited commercialization, low conductivity, difficulty in using thick film forms and high current conditions, and achieve Improve the effect of unit capacitance

Inactive Publication Date: 2003-10-29
活力韩国株式会社 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its high price limits its commercialization
In addition, some metal oxides have low conductivity, making them difficult to use in thick film form and under high current conditions

Method used

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  • Mesoporous carbon material, carbon/metal oxide composite materials, and electrochemical capacitors using them
  • Mesoporous carbon material, carbon/metal oxide composite materials, and electrochemical capacitors using them
  • Mesoporous carbon material, carbon/metal oxide composite materials, and electrochemical capacitors using them

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] A mixture of resorcinol and formaldehyde (molar ratio 1:2) was added to LUDOX SM-30 silica hydrogel to form a final molar ratio of 1:2:7.5:86 (resorcinol:formaldehyde:silica: water). The pH of the mixed solution was adjusted to 8 by adding 1N aqueous sodium hydroxide solution and 1N nitric acid aqueous solution. The mixed solution was concentrated and aged at 85° C. for 3 days to form a resorcinol-formaldehyde-gel / silica composite. Under a nitrogen atmosphere, the composite material was heated to 850° C. and transformed into a carbon / silica composite material, and the composite material was etched in 48% hydrofluoric acid for 12 hours while stirring to remove the silica and retain the mesoporous carbon. The synthesized mesoporous carbon has a specific surface area of ​​847 m2 / g and a pore volume of 2.6 cm3 / g. 99% of the pores are larger than 2 nm and the conductivity measured by Aida's method (Carbon, 24, 337 (1986)) is 7.2 S / cm. figure 1 A schematic procedure for E...

Embodiment 2

[0081] Mesoporous carbon was synthesized by the same method as in Example 1, except that LUDOX HS-40 was used instead of LUDOX SM-30. The synthesized mesoporous carbon has a specific surface area of ​​950 m2 / g, a pore volume of 5.5 cm3 / g and an average pore diameter of 23 nm. Furthermore, this carbon has 96% macroporosity (>2nm). figure 2 A SEM (scanning electron microscope) photograph of synthetic carbon at a magnification of 75,000 is shown. Such as figure 2 As shown, the pore size is between 10nm and 100nm.

Embodiment 3

[0083] Surfactant stabilized silica was prepared by adding 5 grams of cetyltrimethylammonium bromide to 100 ml of LUDOX SM-30 silica hydrosol. Residual surfactant was removed by washing 3-5 times with 100 ml of distilled water. Add dropwise a mixture of resorcinol, formaldehyde, sodium carbonate and water (1:2:0.015:5.6 in molar ratio) to the surfactant-stabilized silica sol solution until the silica is fully wetted, wherein sodium carbonate is used as the intermediate Catalyst for the formation of gels from quinone and formaldehyde. The mixture solution was aged at 85°C for 3 days to form a resorcinol-formaldehyde-gel / silica composite, which was heated at 850°C for 3 hours in nitrogen to transform the composite into a carbon / silica composite. The resulting composite was etched in 48% hydrofluoric acid for 12 hours with stirring to remove the silica in the composite to obtain the final mesoporous carbon. This carbon has a specific surface area of ​​1090 m2 / g, a pore volume o...

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Abstract

The invention relates to a carbon material with mesopores of 2 to 20 nm and high porosity, a carbon / metal oxide composite material in which metal oxides are deposited in carbon pores by using the carbon material, and an electric double made of the carbon material. A layer capacitor and an electrochemical capacitor made using the carbon / metal oxide composite material. When mesoporous carbon is used as an electrode material for an electric double-layer capacitor, the electric double-layer capacitor is superior to existing electric double-layer capacitors due to its low equivalent series resistance, although its capacitance value per unit weight is low due to its low surface area. Has a higher charge storage capacity. Moreover, when the carbon / metal oxide composite material is used as an electrode material of an electric double-layer capacitor, the capacitor has a higher capacitance value per unit weight through the combination of the electric double-layer capacitor and the metal oxide pseudocapacitor, that is, 254F / g.

Description

technical field [0001] The present invention relates to mesoporous (pore diameter: 2-20nm) and high porosity carbon materials, carbon / metal oxide composite materials synthesized by depositing metal oxides on mesoporous carbons, electric double layers using mesoporous carbons Capacitors and electrochemical capacitors using carbon / metal oxide composites. Background technique [0002] In recent years, the development of supercapacitors has become very important for load balancing of electrical energy sources including batteries (including rechargeable batteries) and fuel cells, and for new mobile communications (IMT-2000) and electric vehicles requiring high pulse power. important. By connecting electrochemical capacitors with excellent power output in parallel with batteries or fuel cells with high energy density, it is possible to meet the demand for pulsed power output and prolong the service life of batteries and fuel cells. [0003] In general, electrochemical capacitors...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C01B31/00C04B38/00H01G9/00H01G9/016H01G9/02H01G9/038H01G9/058H01G9/155
CPCC04B38/0022C04B2111/00844Y02E60/13C01B32/00H01G11/34H01G11/46H01G11/38H01G11/52H01G11/62H01G11/68C04B35/52C04B38/0054C04B38/04C04B35/01C04B41/4529C04B41/455C04B41/5027
Inventor 吴承模玄泽焕张宗铉尹城勋
Owner 活力韩国株式会社
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