Capacitor and method for manufacturing capacitor

Abstract

This capacitor is provided with: a positive electrode; an oxide layer; a dielectric layer; and a negative electrode. The oxide layer is positioned between the positive electrode and the dielectric layer. The positive electrode comprises a Zr alloy (ZrM, where M is a metallic element that can form an oxide film in an electrolytic solution). The oxide layer includes a ZrM composite oxide ((ZrM)OY, wherein Y<2) that has a hexagonal closest packing structure. The dielectric layer includes a ZrM composite oxide ((ZrM)O2).

Description

technical field [0001] The present invention relates to capacitors having anodes formed from Zr (zirconium) alloys. Background technique [0002] Valve metals such as Al (aluminum), Ta (tantalum), and Nb (niobium) can be used as a material for an anode of an electrolytic capacitor (capacitor). Generally, when an anode is made of these metal materials, a dielectric layer made of an anodic oxide film is formed on the metal material. A capacitor having such an anode is specifically disclosed in Non-Patent Document 1 and Patent Document 1, for example. [0003] In Non-Patent Document 1, two types of capacitors, an aluminum capacitor and a tantalum capacitor, are explained as representative examples of these capacitors. Among them, tantalum capacitors are characterized by smaller size and higher capacity than aluminum capacitors. Therefore, tantalum capacitors are widely used in electronic equipment and the like at present. However, tantalum is a rare metal, so the raw materi...

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Problems solved by technology

However, tantalum is a rare metal, so the raw material price is high

In addition, the origin of raw materials is also limited, and there are certain problems from the viewpoint of stable material supply

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