JPH0740537B2 - Capacitor manufacturing method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor used in various electronic devices.

2. Description of the Related Art Capacitors made of plastic films, metallized films, ceramics, etc. have been used as dielectrics.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention provides the following problems without incorporating a dielectric layer as described above.
It is intended to provide a new type capacitor element using an organic thin film-electrode integrated film formed on a positive electrode by electrolytic polymerization.

Means for Solving the Problems In the present invention, a negative electrode plate is divided into two parts at the time of electrolytic polymerization, one positive electrode plate is installed between both negative electrode plates, and both surfaces of the positive electrode plate are arranged. A uniform organic thin film is formed on top. next,
Aluminum is vacuum-deposited on both film surfaces of the electrode / membrane integrated product thus obtained to form one electrode of each of the two-layer capacitors, and the other surface electrode is a positive metal electrode during electrolytic polymerization as it is as a common electrode. To use as. However, a metal different from aluminum is used for the common electrode.

Further, the above electrode / membrane integrated product can be achieved by using only one sheet in the case of further increasing the capacity of a wound or laminated capacitor. In particular, when a wound element is used or when miniaturization of the element is required, a thin plate having a winding property such as a foil is used as a positive electrode during electrolytic polymerization.

After the electrolytic polymerized film is formed, it is washed with pure water, a pure solvent, etc. to remove free salts, residual solvent, unreacted monomers, etc., and dried to carry out the above-mentioned processing. However, the dedoping phenomenon does not occur by such an operation.

Monomers used for electrolytic polymerization include thiophene, pyrrolefuran, selenophene, paraphenylene, anthracene, azulene, aniline, etc., at least a carbon ring in the molecule,
There are nitrogen-containing rings, selenium-containing rings, oxygen-containing rings, aminoaromatic rings, sulfur-containing rings and the like. Salts used as a supporting electrolyte during electrolytic polymerization include lithium borofluoride, paratoluene sulfonate, silver perchlorate, lithium perchlorate, copper chloride, tetrabutylamine borofluoride, tetrabutylamine perchlorate, and the like. Used alone or as a mixture. Benzonitrile, acetonitrile, nitrobenzene,
Ortho-dichlorobenzene, dimethyl sulfate, water, etc.

Action The inventors of the present invention have conducted various experiments and studies on a system in which aluminum is vacuum-deposited on a conductor obtained by electrolytic polymerization and an organic thin film in a semiconductor characteristic region. , It was confirmed that the electrode action provides a capacitor with extremely large capacity and small leakage current at the interface between the electrode and the semiconductor.

Therefore, most of the remaining volume of the organic thin film functions as a counter electrode conductive material. Furthermore, as a result of various polymerization methods in which the negative electrode was divided into two parts during electrolytic polymerization and one positive electrode was installed between both negative electrodes, a uniform organic thin film was formed on both sides of the anode, and the film characteristics Was also confirmed to be the same as that formed on only one surface of the anode. In addition, in these electrode / membrane integrated products, a two-layer capacitor is formed in which aluminum serves as one of the electrodes and the positive electrode during electrolytic polymerization serves as the common electrode, and the capacitor characteristics are such that the above-mentioned electrode function is completely I confirmed again that it was being demonstrated. As the positive electrode, it is preferable to use a metal having a work function larger than that of aluminum.

Example The configuration and characteristics of the capacitor according to the example are shown in the table.

The polymers of thiophene, pyrrole and azulene used here are acetonitrile-lithium borofluoride,
Film thickness 5 electro-polymerized by acetonitrile-paratoluene sulfonate system, benzonitrile-lithium perchlorate system
μm, and salt / solvent (ratio) and monomer / solvent (ratio) were both 2 g / 180 g (ratio). The electrode B of the capacitor is a positive electrode during electrolytic polymerization. Pt sputter is a 6 μm thick polyethylene terephthalate film with Pt layers metallized on both sides by sputtering. Ni foil, Co
The foil used was 6 μm thick. Further, these capacitors are polar, and a high withstand voltage is obtained when the aluminum electrode side is positive, and the leakage current in the table is the value in this case.

The film thickness of the organic thin film can be controlled in an electrical quantity by setting various conditions during electrolysis, and a uniform ultra thin film can be obtained to obtain a long film or a wide film having a thickness of 1 μm or less. Even with this film thickness, the various characteristics shown in the table were maintained, and even the characteristics were improved.

This two-layer capacitor integrated body consisting of ultra-thin film is not wound simultaneously with other dielectrics, electrode materials, spacers, etc. Excellent properties could be obtained.

Similar results were obtained with other polymer membranes, electrodes and systems.

EFFECTS OF THE INVENTION According to the present invention, an excellent two-layer capacitor having a large capacity and a small leakage current can be obtained due to the electrode effect of the organic thin film obtained by electrolytic polymerization, and further miniaturization can be achieved by making the organic thin film ultra thin.
A lightweight and dry type capacitor can be obtained. In addition, this membrane / electrode integrated product can have a one-roll structure or a one-layer structure even if it is used as a large-capacity capacitor element, and an extremely efficient manufacturing method can be achieved.

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location H01G 4/18 321 9174-5E

Claims (1)

[Claims] 1. A negative electrode plate is divided into two parts at the time of electrolytic polymerization,
One positive electrode plate made of a metal other than aluminum is placed between the negative electrode plates, an organic thin film is formed on both surfaces of the positive electrode plate by electrolytic polymerization, the organic thin film is washed and dried, and then Aluminum is vapor-deposited on the surface of the organic thin film, the aluminum is used as one electrode, and the positive electrode plate is used as the other electrode.