Electrode foil, current collector, electrode, and energy storage element using same

Abstract

This negative electrode foil for a solid electrolyte capacitor: increases capacitance, reduces ESR and leakage current, improves heat resistance, and reduces manufacturing costs; and improves the power density, achieves rapid charging / discharging, and improves the lifespan characteristics of energy storage elements such as rechargeable batteries, electric double-layer capacitors, and hybrid capacitors. The negative electrode foil or a current collector is used, which: is obtained by forming a metal layer, a mixed layer obtained by mixing a material constituting the metal layer with carbon, and a carbon layer substantially comprising carbon, on a metal foil; and is configured in such a manner as to change as the components of the mixed layer change from a component containing only the material substantially constituting the metal layer to a component substantially containing only carbon, and from the metal layer to the carbon layer.

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...

AI Technical Summary

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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