Electrode plate of electric double layer capacitor (EDLC) and preparation method thereof

A technology of supercapacitors and electrode sheets, applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve the problems of reduced working voltage, electrochemical corrosion of EDLC metal parts, etc., to reduce internal resistance and improve electrochemical resistance. Corrosion ability, effect of stable working voltage

Inactive Publication Date: 2013-07-10
CHANGCHUN JLU KENUO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resistivity of nano-carbon powder itself is another difficulty in reducing the internal resistance of EDLC
[0006] Another difficulty is the electrochemical corrosion of EDLC metal parts, especially the electrochemical corrosion of EDLC anodes
Worryingly, galvanic corrosion can lead to a reduction in operating voltage

Method used

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  • Electrode plate of electric double layer capacitor (EDLC) and preparation method thereof
  • Electrode plate of electric double layer capacitor (EDLC) and preparation method thereof
  • Electrode plate of electric double layer capacitor (EDLC) and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Pitch-based spherical activated carbon may contain 0.5%wt impurities such as iron oxides and other iron compounds. Impurities form oxygen-containing functional groups on the surface of activated carbon, such as carbonyl, hydroxide, ether, etc. Iron compounds and oxygen-containing functional group impurities increase the self-discharge of EDLC and shorten the lifetime.

[0034] Impurities can be removed by the following method: Pitch-based spherical activated carbon is acid-washed with carboxylic acid and then filtered, the filter residue is collected, and the filter residue is heated from 600°C to 1200°C under the protection of inert gas. The heating process can remove the oxygen-containing functional groups on the surface and increase the graphitization of nano-carbon powder to enhance conductivity. After treatment, the specific surface area is ≥2000m 2 / g, activated carbon with a pore size of 1nm to 3nm. Use 600-mesh and 800-mesh sieves to screen activated carbon w...

Embodiment 2

[0041] The pitch-based spherical activated carbon is acid-washed with carboxylic acid and then filtered, the filter residue is collected, and the filter residue is heated from 600°C to 1200°C under the protection of an inert gas. After treatment, the specific surface area is ≥2000m 2 / g, activated carbon with a pore size of 1nm to 3nm. Use 1000 mesh and 1340 mesh sieves to screen activated carbon with a particle size of 10-13 μm as the electrode active material.

[0042] Weigh deionized water and ethanol with a volume ratio of 1:2, mix well, add PTFE solution, stir well, add acetylene black, and continue stirring. The solid content in the mixed solvent is 4wt%. After mixing evenly, add the treated activated carbon and grind it with a mortar. The ground electrode material was pressed into a 100 μm sheet with a roller press. The mass fractions of electrode active material, acetylene black and PTFE are 85%, 10% and 5%.

[0043] A 23 μm thick aluminum foil is selected as the ...

Embodiment 3

[0048] In this embodiment, a current collector without surface treatment is used, and the electrode material is directly coated on the current collector without using conductive glue, and other processes are completely consistent with Embodiment 2.

[0049] The pitch-based spherical activated carbon is acid-washed with carboxylic acid and then filtered, the filter residue is collected, and the filter residue is heated from 600°C to 1200°C under the protection of an inert gas. After treatment, the specific surface area is ≥2000m 2 / g, an electrode active material with an average particle size of 10 μm and a pore size of 1 nm to 3 nm.

[0050] Weigh deionized water and ethanol with a volume ratio of 1:2, mix well, add PTFE solution, stir well, add acetylene black, and continue stirring. The solid content in the mixed solvent is 4wt%. After mixing evenly, add the treated activated carbon, and the mass fractions of the electrode active material, acetylene black and PTFE are 85%,...

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Abstract

The invention belongs to the technical field of electric double layer capacitor manufacturing, and relates to an electrode plate of an electric double layer capacitor (EDLC) and a preparation method thereof. According to the electrode plate of the EDLC and the preparation method thereof, conductive carbon granules are embedded in one surface or two surfaces of a current collector, and the surface is bonded with electrode material through conductive adhesive; the electrode material is formed by electrode active substance, conductive agent and adhesive agent; the conductive adhesive is formed by conductive agent and rubber, and the rubber is capable of preventing current collector from being corroded electrochemically in electrolyte; and the current collector is made of aluminum foil as thick as 20um-30um, and the conductive carbon granules are embedded on the surface of the current collector with a high purity graphite bar by means of electrical spark discharge. The electrode active substance is active carbon like asphalt base ball, the specific surface area of the electrode active substance is larger than or equal to 2000m<2>/g, the grain size is 10um-23um, and the bore diameter is 1nm-3nm. By means of the electrode plate of the EDLC and the preparation method thereof, internal resistance of the EDLC is decreased, the electrochemical corrosion resistance of the EDLC current collector is improved, service life of the EDLC is prolonged, and working voltage is stabilized.

Description

technical field [0001] The invention belongs to the technical field of supercapacitor manufacturing, and in particular relates to a supercapacitor electrode sheet and a preparation method thereof. Background technique [0002] Supercapacitors, also known as electric double layer capacitors (Electric Double Layer Capacitor, EDLC), are effective energy storage components. In order to increase energy density and power density, a well-known direction is to reduce internal resistance, increase operating voltage and operating time. However, as described below, various difficulties have been encountered in achieving the above objectives. [0003] One of the difficulties is that there is an insulating oxide film on the EDLC electrode metal current collector. This insulating oxide film increases the contact resistance between the nanoporous carbon layer and the metal current collector. Increased contact resistance leads to an increase in internal resistance and a corresponding red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/86
CPCY02E60/13
Inventor 韩炜伊佐托夫·弗拉基米尔纪媛
Owner CHANGCHUN JLU KENUO TECH CO LTD
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