Method of manufacturing electrode for electrochemical device

a manufacturing method and electrochemical technology, applied in the manufacturing process of electrodes, cell components, electrolytic capacitors, etc., can solve the problems of inability to endure long-term use, easy cracking or collapse, uneven surfaces can be easily formed, etc., and achieve the effect of efficient manufacturing

Inactive Publication Date: 2006-07-13
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0092] As described above, according to the invention, there is provided a manufacturing method that allows continuous mass production of electrodes for electrochemical devices.

Problems solved by technology

However, the electrode formed by this method has a rigid porous structure and can easily crack or collapse.
Thus, it cannot endure long-term use.
In the process of forming a thin film-shaped electrode sheet, therefore, uneven surfaces can be easily formed, and thus performance of the resulting electrochemical device can be unsatisfactory.
However, this method has complicated processes.
In this method, however, the viscosity of the slurry highly depends on the solid content, and thus a slight increase in slurry concentration can lead to a great change in slurry viscosity.
Therefore, the coating performance can easily be degraded, and continuous production is not possible by this method.
As mentioned above, it is difficult to achieve continuous production by any of the conventional manufacturing methods, and for example, a long electrode sheet cannot be efficiently produced.
The conventional methods have a problem with mass production.

Method used

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  • Method of manufacturing electrode for electrochemical device
  • Method of manufacturing electrode for electrochemical device
  • Method of manufacturing electrode for electrochemical device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0083] In a kneader, 75 parts of a high-purity activated carbon powder with a specific surface area of 1500 m2 / g and an average particle diameter of 10 μm, 16.7 parts of electroconductivity-imparting agent dispersion B, 12.5 parts of particulate rubber of 40% carboxy-modified styrene / butadiene copolymer latex (BM-400B), and 2 parts of particulate thermoplastic elastomer A were kneaded, and then dried under reduced pressure to be powdered. The resulting powdered mixture had an average particle diameter of 15 μm. After drying, electrically conductive adhesive C was applied with a thickness of 5 μm to the collector. The powdered mixture was spread onto the adhesive-coated collector using a screw feeder and allowed to pass through a roll to have an even surface (at a collector sheet feeding speed of 4 m / minute). The collector with the spread powdered mixture was then heated to 200° C. so that the thermoplastic elastomer was melted. Thereafter, the collector with the mixture was roll-pre...

example 2

[0087] A capacitor electrode sheet and an electric double layer capacitor were prepared and subjected to measurement using the process of Example 1 except that 12.5 parts of particulate rubber of 40% acrylate latex (composition: 2-ethylhexyl acrylate / acrylonitrile / methacrylic acid / ethylene glycol dimethacrylate=81 / 15 / 3 / 1 with a particle diameter of 0.15 μm) and 5 parts of particulate thermoplastic elastomer A were alternatively used. It was demonstrated that a long capacitor electrode sheet was stably formed and that the capacitor had good performance. The results are shown in Table 1.

example 3

[0088] A capacitor electrode sheet and an electric double layer capacitor were prepared and subjected to measurement using the process of Example 2 except that 16.7 parts of a polymer dispersion (with a particle diameter of 0.20 μm and a solids content of 30%) was used as the particulate rubber, wherein the polymer dispersion was produced by emulsion polymerization of a monomer mixture of 74 parts of butyl acrylate, 25 parts of methyl methacrylate and 1 part of ethylene glycol dimethacrylate in the presence of 5 parts of polyvinyl alcohol. It was demonstrated that a long capacitor electrode sheet was stably formed and that the capacitor had good performance. The results are shown in Table 1.

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Abstract

A method of manufacturing an electrode for an electrochemical device is provided with the steps of: supplying, onto a collector, a powdered mixture containing a binder and an active material; and heating the powdered mixture to form an electrode layer on the collector, that allows continuous mass production of electrodes for electrochemical devices.

Description

TECHNICAL FIELD [0001] The invention relates to a method of manufacturing an electrode for an electrochemical device. BACKGROUND ART [0002] Recently, with the developments in electronic instruments, there has been a demand for development of compact, lightweight, high-energy-density, rechargeable electrochemical devices. In particular, there has been an expansion in the use of high-energy-density lithium-ion secondary batteries and long-life, high-current-producible electric double layer capacitors and redox capacitors, because of their advantages. [0003] Recently, there has been a drastic increase in the demand for electric double layer capacitors serving as memory-backup power sources, which use an electric double layer formed on an interface between a polarized electrode and an electrolyte. Attention for electric double layer capacitors has also been focused on large-capacitance-demanding applications such as electric vehicle power sources. [0004] In the fields of cellular phones...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B05D5/12H01G11/22H01G11/24H01G11/28H01G11/38H01G11/42H01G11/66H01G11/86H01M4/139H01M4/1393H01M4/62
CPCH01G9/058H01G9/155H01G11/38H01G11/42H01G11/86H01M4/02Y10T29/417H01M4/0404H01M4/043H01M4/0471H01M4/0483Y02E60/13H01M4/04Y02E60/10H01G11/28H01G11/22
Inventor HIROKAWA, YOSHITSUGU
Owner ZEON CORP
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