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Production method of electrode for electrochemical device and production method of electrochemical device

A technology of electrochemical components and manufacturing methods, which is applied in the direction of electrode manufacturing, hybrid/electric double layer capacitor manufacturing, electrical components, etc., and can solve problems such as difficulty in removing solvents, pore blockage, and reduced electrostatic capacitance of activated carbon

Inactive Publication Date: 2007-01-31
TDK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, it can be said that it is extremely difficult to remove the solvent adsorbed in these micropores
[0010] Under the action of the solvent, since there is a case where polymerization occurs when heated, this phenomenon can be caused: the solvent is polymerized in the pores when heated in the state where the solvent is adsorbed in the pores. Although it is intended to remove the solvent by heating, Instead, the pores are clogged with polymer
[0011] In this way, if the solvent is adsorbed in the pores on the surface of the activated carbon, or the pores are blocked by the polymer of the solvent, the electrolyte ions will disappear when approaching the surface of the activated carbon, and the electrostatic capacity of the activated carbon will decrease.

Method used

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  • Production method of electrode for electrochemical device and production method of electrochemical device
  • Production method of electrode for electrochemical device and production method of electrochemical device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] (Preparation (production) process of paint for electrode formation)

[0125] A 5 wt % polyvinylidene fluoride (PVDF) solution (manufactured by Kureha Chemical Industry Co., Ltd., KF7305 (trade name), carbon black (Denki Kagaku Kogyo Co., Ltd., trade name DAB50), and activated carbon (Kurare Chemical Co., Ltd., trade name RP-20) were kneaded at 60 rpm for 1 hour.

[0126] Put the kneaded product in a predetermined amount into a resin container, add a solvent (NMP) to obtain a viscosity suitable for coating, and disperse it with a disperser (manufactured by Hibride Mikisa, Keyence Co., Ltd.) , making electrode coatings.

[0127] Using the paint for electrode formation prepared in this way, an electrode was produced in the following procedure.

[0128] Electrode production

[0129] An etched aluminum foil (manufactured by Nippon Capacitor Industries, trade name: 40C054) was prepared as a current collector, and the electrode-forming paint prepared as described above was ...

Embodiment 2

[0154] The supercritical carbon dioxide treatment performed in Example 1 above was modified in the following manner.

[0155] That is, acetone is sprayed onto the calendered electrode by spraying, followed by supercritical carbon dioxide treatment. It is presumed that acetone also coexists when the supercritical carbon dioxide treatment is performed.

[0156] Except for this, the electric double layer capacitor sample of Example 2 was produced in the same manner as that of the electric double layer capacitor sample of Example 1 above.

[0157] As shown in Table 1 below, the amount of NMP remaining in the electrode (coating film) is 130 ppm, and the electrostatic capacitance per volume of the electrode is 18.9 (F / cm 3 ), the initial charge-discharge efficiency η is 19.1%.

Embodiment 3

[0159] The supercritical carbon dioxide treatment performed in Example 1 above was modified in the following manner.

[0160] That is, the calendered electrode was immersed in acetone, and supercritical carbon dioxide treatment was performed immediately after it was taken out of the acetone. It is presumed that acetone also coexists when the supercritical carbon dioxide treatment is performed.

[0161] The electric double layer capacitor sample of Example 3 was produced in the same manner as that of the electric double layer capacitor sample of Example 1 above except for this.

[0162] As shown in Table 1 below, the amount of NMP remaining in the electrode (coating film) was 110 ppm, and the electrostatic capacitance per volume of the electrode was 19.1 (F / cm 3 ), the initial charge-discharge efficiency η is 19.3%.

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Abstract

According to the present invention, when the electrode for electrochemical devices is fabricated, the treating method for removing off a binder solvent adsorbed to pores in an electrode-constituting activated charcoal or the like, using carbon dioxide in a supercritical state, is used or a method wherein the supercritical-state treating method is modified using a low-boiling solvent is used, whereby the electrostatic capacity of the carbonaceous material as the active substance and the reliability of the electro-chemical device can be improved.

Description

technical field [0001] The present invention relates to a method for manufacturing an electrode used in an electric double layer capacitor (EDLC), a lithium ion secondary battery, etc., and a method for manufacturing an electrochemical element mainly using the method. Background technique [0002] Electrochemical elements such as electric double layer capacitors (EDLCs) and lithium ion secondary batteries are widely used in cellular phones, PDAs (Personal Digital Assistants), and the like. [0003] The electrodes of these electrochemical elements are made by adding an active material, a binder, a solvent for dissolving the binder, or a solvent for imparting plasticity to the electrode in the case of using an insoluble binder (together these It is produced by coating an electrode-forming coating material such as a "binder solvent" together with a conductive additive such as carbon black, which is used as necessary, on a current collector (support) such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/058H01M4/04H01G11/06H01G11/20H01G11/22H01G11/24H01G11/38H01G11/42H01G11/86H01M4/02H01M4/1393H01M4/583H01M10/05
CPCH01G11/86Y02E60/122H01M4/1393Y02E60/13H01G11/32H01G9/058H01M4/587H01M4/0404H01M10/0525Y10T29/49115Y02E60/10
Inventor 铃木长直井克夫
Owner TDK CORP
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