JPS60245111A - Capacitor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a capacitor using an organic high dielectric material as a solid electrolyte.

[Conventional technology]

Conventionally, in solid electrolytic capacitors, the anode side electrode is made of a film-forming metal such as aluminum with an anodic oxide film such as aluminum oxide, and the surface is further coated with manganese dioxide or TCNQ (7, 7, 8, 8 tetra A solid electrolyte such as cyanoquinodimethane (cyanoquinodimethane) salt is used.

However, when manganese dioxide is used as a solid electrolyte, there are disadvantages such as damage to the oxide film on the anode side electrode due to the thermal decomposition effect that occurs when forming the manganese dioxide layer, and the repair of the anodic oxide film by manganese dioxide. It has disadvantages such as low performance.

In addition, when TCNQ salt, which is an organic semiconductor, is used as a solid electrolyte, since TCNQ salt is usually in the form of powdered crystals, it has high electrical conductivity and has better film repair than manganese dioxide. However, since the conductivity is fixed, it has been difficult to realize a solid electrolytic capacitor with desired electrical characteristics.

[Problem that the invention seeks to solve]

This invention uses polyacetylene doped in a dielectric oxide film as a solid electrolyte to achieve the desired electrical performance, such as setting resistance loss within an appropriate range without impairing the repairability of the dielectric oxide film. The purpose of this invention is to provide a capacitor with characteristics that can be obtained.

[Means for solving problems]

This invention uses an electrode in which a dielectric oxide film is formed on a film-forming metal, and the dielectric oxide film is doped with polyacetylene to form a polyacetylene layer.

[For production]

By doping the dielectric oxide film formed on the film-forming metal with polyacetylene and forming a preacetylene layer on its surface, the resistance loss can be reduced to an appropriate range without impairing the repairability of the dielectric oxide film. The desired electrical characteristics can be obtained.

〔Example〕

The present invention will be explained below based on embodiments shown in the drawings.

FIG. 1 shows an embodiment of a capacitor according to the present invention, and this embodiment constitutes a stacked solid electrolytic capacitor. That is, the capacitor elements 2 are laminated in a plate shape, and the anode side lead 14 and the cathode side lead 6 are electrically connected to the opposing anode side electrode and cathode side electrode of each element 2, respectively. There is. Here, the stacked capacitor elements 2 are connected to the outer case plate 1 through the clamping plate 8.
0, it is held from both sides.

FIG. 2 shows the electrode structure of the capacitor element 2. As shown in FIG. That is, the anode side electrode 12 is formed of a film-forming metal such as aluminum, and the surface layer of this anode side electrode 12 is subjected to surface enlargement treatment by chemical etching, for example, and then oxidized by chemical conversion. A dielectric oxide film 14 made of aluminum is formed.

A polyacetylene layer 16 is formed on this dielectric oxide film 14 by acetylene polymerization in an acetylene gas atmosphere.
is formed. That is, this polyacetylene layer 1
6 is chemically doped with a dopant such as arsenic pentafluoride to form a solid electrolyte layer, and a desired electrical type conductivity can be obtained depending on the type and concentration of this dopant.

The surface of the polyacetylene layer 160 is coated with a protective film such as:
81111 layer 18 of polypyrrole, polythiophene, etc.
is formed by methods such as electrolytic polymerization and plasma polymerization.

With this structure, the polyacetylene layer 16
Depending on the desired capacity, various selections of dopants in
Desired electrical properties, such as reduction of dielectric loss, can be achieved.

In the above embodiment, the thin film layer 18 is made of polypyrrole, polythiophene, etc., which have good conductivity, but as shown in FIG. 3, the film layer 18A is made of non-conductive polyethylene, polystyrene, etc. You may also do so. In this case, the electrode connection lead is, for example,
Connection is made via a conductive layer 20 deposited on the surface of the film layer 18A.

In addition, the same effect can be expected by using ordinary etched metal foil for the cathode side electrode, and for the anode side electrode,
A capacitor element can be similarly constructed using a plain foil made of a film-forming metal that has not been subjected to etching treatment.

〔Effect of the invention〕

As explained above, according to the present invention, a polyacetylene layer formed by doping polyacetylene to a dielectric oxide film formed on a surface like a film-forming metal is used as a solid electrolyte, so that an excellent film can be obtained. In addition to having repairability, it is possible to obtain any desired electrical characteristics depending on the type and concentration of the dopant.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the capacitor of the present invention, FIG. 2 is a sectional view showing the electrode structure of the capacitor element,
FIG. 3 is a sectional view showing another example of the electrode structure of a capacitor element. 12... Film-forming metal, 14... Dielectric oxide film, 16... Polyacetylene layer, 18... Thin film layer as a protective II film.

Claims (1)

[Scope of Claims] +11 A capacitor characterized by using an electrode in which a dielectric oxide film is formed on a film-forming metal, and the dielectric oxide film is doped with polyacetylene to form a polyacetylene layer. (2) The capacitor according to claim 1, wherein the polyacetylene layer has a protective film formed on its surface.