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Electric double layer capacitor and method of making the same

An electric double layer capacitor and capacitor technology, which can be used in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, electric vehicles, etc., and can solve problems such as restricting application fields.

Active Publication Date: 2022-07-05
ZHONGTIAN SUPERCAPACITOR TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no reports of farad-level electric double-layer capacitors reaching millisecond-level response, which limits its application fields.

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0024] A preparation method of an electric double layer capacitor, comprising the following steps:

[0025] The metal foam material is taken, the metal foam material and the carbon source are contacted with each other, and the carbon source is decomposed into carbon under preset conditions to form a carbon-covered metal foam material in which the carbon tightly wraps the metal foam structure. In one embodiment, the foamed metal material is aluminum foamed metal material. In other embodiments, the metal in the foamed metal material may be one or a combination of nickel, iron, aluminum, and copper. The initial void ratio of the foamed metal material is 80-96%, and the thickness is 0.2-2 mm.

[0026] In one embodiment, the carbon source is a high-viscosity liquid-phase carbon source, the viscosity of the liquid-phase carbon source is 1,000-100,000 centipoise, and the liquid-phase carbon source is paraffin, lubricating oil, washing oil, and resin. Or a combination of one or more ...

Embodiment 1

[0033] A foamed aluminum material is taken, and the foamed aluminum material is coated with a high-viscosity liquid-phase carbon source. In this embodiment, the thickness of the foamed aluminum material is 0.2 mm, the porosity is 95%, and the liquid carbon source is composed of 50% paraffin, 20% epoxy resin, and 30% lubricating oil. The temperature is 250°C, the pressure is 0.8MPa (absolute pressure), and the treatment time is 4 hours to form a carbon-coated aluminum foam material with a carbon-encapsulated aluminum foam structure, and carbonization is formed at the interface where the two are combined. Aluminum compound layer, carbon layer thickness of 0.02 microns. In this embodiment, the carbon layer is uniformly coated on the surface of the metal foam, and the outer surface of the carbon layer is dense.

[0034] The carbon-coated foam aluminum material is pressed to form a 0.05mm pole piece, and the porosity of the control pole piece is 70%; the same pole piece is used as...

Embodiment 2

[0037] The foamed copper material is taken, and the introduced gas-phase carbon source is in contact with the surface of the foamed copper material. In this embodiment, the thickness of the foamed copper material is 0.3 mm, and the porosity is 93%; the gas-phase carbon source is composed of 50% ethylene, 20% liquefied gas, 6% cyclohexanone, 4% acetone and 20% petroleum ether composition. The foamed copper material in contact with the gas-phase carbon source was treated at a temperature of 300° C. and a pressure of 0.1 MPa (absolute pressure) for 0.1 hour to form a carbon-clad copper foam material with a carbon-encapsulated copper foam structure. And a copper carbide compound layer is formed at the interface where the two are combined. In this embodiment, the thickness of the carbon layer is 0.02-5 microns.

[0038] The carbon-coated copper foam material is pressed to form a 0.1mm pole piece, and the porosity of the control pole piece is 90%. Take the same pole piece as the ...

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Abstract

An electric double layer capacitor and a preparation method thereof, wherein the preparation method comprises the following steps: contacting a metal foam with a liquid-phase carbon source or a gas-phase carbon source, under preset conditions, to form a carbon-coated foamed metal material, the carbon-coated metal foam The foamed metal material is a structure in which a carbon layer coats the foamed metal material, and the interface between the foamed metal material and the carbon layer forms a compound layer of metal and carbon; the carbon-covered foamed metal material is pressed to form a pole piece, and the pole The plate is cut, and the pole lug is welded at the edge of the pole piece, and the pole piece is selected as the positive electrode piece and the negative electrode piece of the capacitor; It is placed behind the capacitor case and injected with electrolyte to seal the capacitor case. By coating the carbon foam metal material, the contact resistance between the carbon layer and the foam metal is reduced by two orders of magnitude. And because there is no glue, the chemical stability of the device is improved, the electrochemical stability window can be increased by 0.2-0.4V, and the energy density can be increased by 20%.

Description

technical field [0001] The invention relates to the technical field of capacitor preparation, in particular to an electric double layer capacitor and a preparation method thereof. Background technique [0002] This section is intended to provide a background or context for the embodiments of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] Electric double layer capacitors are energy storage devices with high power and long life. The mechanism of action is that the ions of the electrolyte are directionally stacked on the interface of the electrolyte / electrode under the action of the electric field. The mechanism is the physical effect of adsorption-desorption, there is no chemical reaction, and there is no chemical reaction heat, so the charging and discharging speed is fast and the service life is long. Generally, the response time of an electric double-layer capacitor with a capa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86H01G11/24H01G11/28H01G11/30H01G11/34
CPCH01G11/34H01G11/30H01G11/28H01G11/24H01G11/86Y02T10/70
Inventor 骞伟中金鹰崔超婕张刚张抒婷缪永华杨周飞钱陆明
Owner ZHONGTIAN SUPERCAPACITOR TECH CO LTD
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