JPS62194610A - Solid electrolytic 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 solid electrolytic capacitor with an improved separator.

Conventional technology The development of solid electrolytic capacitors has progressed rapidly in recent years, and aluminum electrolytic capacitors have changed from conventional ones using manganese dioxide as the electrolyte to those using 7.7.8.8 tetracyanoquinodimethane (hereinafter referred to as TCNQ) complex. Products using organic semiconductors consisting of The method for producing a solid electrolytic capacitor using this TCNQ complex is to place an anode foil and a cathode foil facing each other, and place the TCNQ complex on an aluminum electrolytic capacitor element wrapped with electrolytic paper as a separator, under a liquefied state until it is heated and melted and decomposed. At this time, as described in JP-A-58-123715,
It is constructed by carbonizing this separator paper. This improves the impregnation of the liquefied complex into the device, thereby increasing capacitance, tan δ and ESR.
The aim is to reduce the equivalent series resistance (equivalent series resistance).

Problems to be Solved by the Invention The above-mentioned carbonization treatment is generally carried out at a temperature of 250°C to 400°C.

However, most of the lead wires used in non-solid electrolytic capacitors are generally CP wires (copper coated steel wires), and this CP cotton wire is tin-plated to improve soldering. When carbonized at the above temperature,
Because this tin plating tends to peel off, silver-plated products are used instead of tin-plated products. Furthermore, it is difficult to control the carbonization process, and if even the slightest unsuitable factor is added, uneven carbonization occurs, increasing the variation in product characteristics.

In some cases, it may peel off and cause a short circuit.

And if the degree of carbonization of the separator paper is low, it will not be carbonized,
There were problems such as a reaction between the remaining electrolytic paper and the complex, which significantly deteriorated the life characteristics.

Means for Solving the Problems As a result of various studies in order to solve the above problems, the present invention uses carbon cloth as a separator instead of using electrolytic paper and carbonizing it as in the past. It has been found that the unstable process of carbonization can be eliminated, impregnation properties are improved, and life characteristics are significantly improved.

That is, a carbon cloth was interposed as a separator between an anode electrode foil made of a valve metal having an anodized film on its surface and a cathode electrode configured to face the electrode foil, and this was impregnated with an organic semiconductor. This solid electrolytic capacitor is characterized by:

Working electrolytic paper is made by bonding paper fibers with an adhesive, and when not only the fibers but also the adhesive were carbonized during the carbonization process, the original shape was extremely deformed and the shape could not be maintained, resulting in a defective element. The cloth does not have the above problems because it has a binder added to it in advance to make it strong. Further, it is possible to create a wound element that is sufficiently strong against elongation, and there is no problem at all.

Furthermore, the porosity can be freely controlled by changing the conditions for creating the carbon cloth, and can be changed depending on the liquefaction characteristics of various TCNQ complexes.

Therefore, it has become possible to control the impregnation conditions, which could not be controlled with carbonization.

Further, the shape of the carbon cloth can be appropriately selected depending on the size and characteristics of the capacitor element, such as fibrous or porous.

Example Hereinafter, specific examples of the present invention will be described.

Assuming an aluminum electrolytic capacitor with a rating of 6.3 W V and 33 μF, sample A was manufactured by winding a 358 m thick carbon cloth with a porosity of 90% as a separator without using electrolytic paper. For comparison, the density is 0.55g/cffl and the thickness is 5.
Using 0 μm manila paper as a separator, capacitor elements were manufactured, including one that was carbonized at 350° C. for 10 minutes (sample B) and one that was left as is without carbonization (sample C).

N-butylisoquinoline TCNQHg as solid electrolyte
Using a body, heat it to melt and impregnate it in a liquefied state for 60 seconds,
Product samples were produced by rapid cooling and solidification and sealing with epoxy resin.

The initial characteristics of each were measured and a high temperature load test at 105° C. was performed, and the results are shown in the table. Each value in the table shows the average value of 20 samples.

As is clear from the table, the solid developed capacitor of the present invention is
It has been demonstrated that the rate of change in capacitance and tan δ is extremely small and stable even when used at high temperatures for long periods of time.

Effects of the Invention As described above, when carbon cloth is used as a separator and impregnated with an organic semiconductor, the impregnation property increases and the
The δ value decreased. Along with this, the ESR has improved and the high frequency characteristics have also been significantly improved. In addition, as shown in the table, it has the effect of improving reliability and making it possible to use low-cost tin-plated CP wire, which was previously unavailable, and has great industrial and practical value. There is something.

Claims (1)

[Claims] A carbon cloth is interposed as a separator between an anode electrode made of a valve metal having an anodic oxide film on its surface and a cathode electrode configured to face the electrode, and this is impregnated with an organic semiconductor. Characteristic solid electrolytic capacitors.