Electrode foils, current collectors, electrodes, and storage devices using these

Abstract

The subject of the present invention is to achieve an increase in electrostatic capacitance, a reduction in ESR and leakage current, an improvement in heat resistance, and a reduction in manufacturing cost in the cathode foil for solid electrolytic capacitors, and to improve the performance of storage batteries, electric double layer capacitors, hybrid The output density of power storage components such as capacitors can be improved, and the life characteristics can be improved by realizing rapid charge and discharge. The solution of the present invention is to use the following cathode foil or current collector. The cathode foil or current collector is a mixed layer formed by forming a metal layer on a metal foil and a substance constituting the metal layer and carbon, and a carbon layer substantially composed of carbon; the composition of the mixed layer is such that, from the metal layer toward the carbon layer, the composition substantially contains only the substance constituting the metal layer changes to the composition substantially containing only carbon.

Description

technical field [0001] The present invention relates to a solid electrolytic capacitor having a solid electrolyte layer (typically a conductive polymer layer) formed therein, and an electrode foil usable in such a capacitor. In addition, the present invention relates to a current collector, an electrode, and an electrical storage component such as a storage battery, an electric double-layer capacitor, or a hybrid capacitor using these. Background technique [0002] Prior Art Related to Solid Electrolytic Capacitors [0003] In recent years, as the operating frequency of electronic equipment has become higher, electrolytic capacitors, one of electronic components, have been required to have excellent impedance characteristics in a region of higher operating frequency than before. In response to this demand, various solid electrolytic capacitors using conductive polymers with high electrical conductivity as solid electrolytes have been developed. This type of solid electroly...

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Problems solved by technology

[0021] However, when the carbon layer is directly formed on the metal foil, the contact resistance between the current collector and the electrode layer gradually increases due to the lack of adhesion between the metal foil and the carbon coating layer, electrical conductivity, and chemical stability. Shortly there will be a decrease in output density or an increase in internal resistance, making it difficult to perform rapid charge and discharge

In addition, according to the investigation of the present inventors, there are patent documents 8 to 11 in the relevant prior art documents, but these disclosed coating structures also have the same problem

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