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

A current collector and capacitor component technology, which is applied in the field of electrode foil, can solve the problems of adhesion, electrical conductivity, insufficient chemical stability, difficulty in charging and discharging, and increased contact resistance, so as to improve electrical conductivity and chemical stability. , Good anti-oxidation effect

CN103380469AActive Publication Date: 2013-10-30JAPAN CAPACITOR IND CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-10-30

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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.
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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...

Examples

no. 1 Embodiment approach

[0088] The following description: On the non-roughened aluminum foil, a first conductive layer composed of Ti or Al, a mixed layer composed of Ti or Al and carbon, and a second conductive layer composed of carbon are formed. Layered cathode foil, and a solid electrolytic capacitor fabricated using the cathode foil, are an embodiment of the present invention. However, as already explained, the aluminum foil used as the substrate and the Ti or Al used to form the first conductive layer can be replaced by other materials, or as explained by the performance test data, even if the surface of the substrate is not roughened Therefore, the cathode foil of the present invention also has good characteristics.

[0089] (cathode foil of the present invention)

[0090] figure 1 It is a cross-sectional view showing the layer structure of the cathode foil 1 according to the above-mentioned one embodiment. The cathode foil 1 is: a smooth aluminum foil 2 that has not been roughened by etchi...

Embodiment 1

[0146] The smooth aluminum foil was etched to form a cathode foil having a Ti coating of 0.2 μm, a Ti and carbon mixed layer a of 0.1 μm, and a carbon coating of 0.2 μm.

Embodiment 2

[0148] The smooth aluminum foil was etched to form a cathode foil having a Ti coating of 0.008 μm, a Ti and carbon mixed layer a of 0.004 μm, and a carbon coating of 0.008 μm.