Electrode, electrochemical device, and method of making electrode

Abstract

An electrode comprises a planar collector, and an active material containing layer disposed on the collector. The active material containing layer comprises a plurality of particles containing an active material, and a binder for binding the particles containing the active material to each other and the particles containing the active material to the collector. The collector has a surface depressed in conformity to a form of the particles containing the active material.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an electrode usable in electrochemical devices such as primary batteries, secondary batteries (lithium-ion secondary batteries in particular), electrolytic cells, and capacitors (electrochemical capacitors in particular), an electrochemical device equipped therewith, and a method of manufacturing an electrode. [0003] 2. Related Background Art [0004] Electrochemical devices such as high-energy batteries typified by lithium ion secondary batteries and electrochemical capacitors typified by electric double layer capacitors have widely been in use in portable devices and the like. Such an electrochemical device mainly comprises a pair of electrodes and an electrolyte (e.g., a liquid electrolyte or solid electrolyte) interposed between the electrodes. [0005] In general, such an electrode of the electrochemical device comprises an active material containing layer stacked on a planar collec...

AI Technical Summary

Benefits of technology

[0006] However, the electrode manufactured by the above-mentioned method has been found to exhibit a relatively high contact resistance between the particle containing the active material and the collector. When such an electrode is used in an electrochemical device, the internal resistance of the electrochemical device becomes higher, whereby the electrochemical device may be obstructed from achieving higher output or higher energy density.

[0007] A view of the problem mentioned above, it is an object of the present invention to provide an electrode which can filly lower the contact resistance between a particle containing an active material and a collector, an electrode equipped therewith, and a method of manufacturing the electrode.

Problems solved by technology

When such an electrode is used in an electrochemical device, the internal resistance of the electrochemical device becomes higher, whereby the electrochemical device may be obstructed from achieving higher output or higher energy density.

Therefore, the contact area between the active material containing sheet and the collector is not sufficient, whereby the contact resistance between the particle containing the active material and the collector is high.

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