Electrode and capacitor provided with said electrode

A capacitor and electrode technology, which is applied in the direction of electrolytic capacitors, electrolytic capacitor manufacturing, capacitors, etc., can solve the problem of reducing the withstand voltage strength of capacitors, and achieve the effect of improving long-term stability and improving stability

Inactive Publication Date: 2008-04-09
EPCOS AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the dielectric becomes thinner, which reduces the dielectric strength and the capacitor fails after a certain time

Method used

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  • Electrode and capacitor provided with said electrode
  • Electrode and capacitor provided with said electrode

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Embodiment Construction

[0025] FIG. 1 shows an electrode with an electrode body 2 which is electrically conductively connected to an electrode discharger 1 . A dielectric layer 3 is provided on the surface of the electrode body 2 . An intermediate layer 4 is arranged between the electrode body 2 and the dielectric layer 3 .

[0026] Fig. 2 shows an electrolytic capacitor using the electrode of the present invention as an anode, wherein the electrode is equivalent to the structure of Fig. 1, and the electrode body 2 of the electrode is a porous body with pores 7. The electrode body 2 preferably contains a unidirectionally conductive metal, such as tantalum or niobium, from which a dielectric oxide can be produced by anodic oxidation.

[0027] The electrode body 2 is preferably made of an alloy of niobium and vanadium in powder form. Wherein, the electrode discharger 1 is made into the shape of a metal wire or a large-area metal discharger. For example, tantalum-containing wires or niobium-containin...

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Abstract

This invention relates to an electrode for a capacitor with an electrode line (1) and with an electrode-body (2), which is contacted with the electrode-line (1) and on the surface of which a dielectric-layer (3) is arranged. Between the electrode-body (2) and the dielectric-layer (3) is arranged an inter-layer (4), which can prevent the exchange of material between the dielectric-layer (3) and the electrode-body (2). By means of the inter-layer (4), especially the diffusion of the oxygen from the dielectric-layer (3) into the electrode-body (2) can be prevented, thus the electrode has a larger long-time stability. In addition, this invention relates to a capacitor with the electrode of this invention as an anode.

Description

technical field [0001] The invention relates to a capacitor electrode with an electrode discharger and an electrode body, the electrode body is connected to the electrode discharger and a dielectric layer is arranged on its surface. Furthermore, the invention relates to a capacitor having such an electrode. Background technique [0002] As is well known, in capacitor electrodes, the electrode body is a porous sintered body made of niobium and the dielectric layer is made of Nb 2 o 5 made by anodic oxidation of porous sintered bodies. Such electrodes can in principle be used as anodes in electrolytic capacitors. In this case, the pores of the sintered body are filled with a cathode material which is connected to a cathode discharger. [0003] Known electrodes of this type have the disadvantage that the dielectric layer does not have sufficient long-term stability since oxygen can diffuse from the dielectric layer into the electrode body. Formation of suboxides in dielect...

Claims

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Application Information

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IPC IPC(8): H01G9/052H01G9/07H01G4/06H01G9/00H01G9/04H01G9/042
CPCH01G9/042H01G9/0032
Inventor M·施藤策尔H·茨尔根J·吉伯
Owner EPCOS AG
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