JPS62119913A - Manufacture of solid electrolyte 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 method for manufacturing a solid electrolytic capacitor using a 7,7.8.8-tetracyanoquinodimethane (abbreviated as TCNQ) complex salt as a solid electrolyte. .

Conventional technology In recent years, with the miniaturization and digitalization of electrical equipment circuits,
Condensers/summers are required to be small, large in capacity, and have low impedance in the high frequency range.

Conventionally, capacitors used in the high frequency range include plastic film capacitors, mica capacitors, and multilayer ceramic capacitors, but these capacitors have large shapes and are difficult to increase in capacity. On the other hand, in aluminum dry electrolytic capacitors and tantalum or aluminum solid electrolytic capacitors, which are known as large-capacity capacitors, the resistance of the electrolyte (solution electrolyte or manganese dioxide solid electrolyte) used is high, so the resistance is sufficiently low in the high frequency range. Impedance cannot be obtained.

In contrast, it has recently been proposed to use TCNQ salt, a highly conductive and anodic oxidizable organic semiconductor, as a solid electrolyte instead of manganese dioxide. As disclosed in the invention by the same applicant (Japanese Patent Publication No. 56-10777) and the invention by Shin Niwa (Japanese Patent Application Laid-open No. 58-17609), an aluminum solid electrolytic capacitor using TCNQ salt is Frequency and temperature characteristics have been significantly improved, and low leakage current characteristics have been achieved. Furthermore, since TCNQ salt is an organic conductive material with excellent thermal stability, the high temperature life of the obtained capacitor far exceeds that of conventional dry electrolytic capacitors.

Problems to be Solved by the Invention However, such a solid electrolytic capacitor is impregnated with a solid electrolyte, cooled, coated with an exterior material, and then measured for leakage current. The value is large due to damage to the dielectric film. Therefore, although attempts have been made to reduce the leakage current by aging, in which the capacitor is energized after the exterior packaging has been completed, the current situation is that sufficient results have not been obtained.

SUMMARY OF THE INVENTION The present invention aims to eliminate the above-mentioned drawbacks, and aims to improve work efficiency in the aging process and reduce leakage current.

Means for Solving the Problems The present invention has been made to achieve the above object, and includes a first electrode having an oxide film on its surface, and a second electrode provided opposite to the first electrode. 7.7.8.8 Between the electrodes
- Manufacture of a solid electrolytic capacitor characterized in that a solid electrolyte based on a tetracyanoquinodimethane salt is impregnated and adhered by thermal melting, and the solid electrolyte is subjected to an aging treatment during the process of cooling and solidifying the solid electrolyte in a molten state or from a molten state. The present invention provides a method.

Function The present invention performs the aging of the energization treatment while the TCNQ salt is in a molten state or in the process of being cooled and solidified from the molten state, so the aging time after cooling and solidification, which is conventional, is omitted and work efficiency is improved. This results in a significant improvement and a reduction in leakage current.

Since the TCNQ salt used here has low hygroscopicity and is inert to water, it is preferable to use water as a coolant. If the capacitor unit is cooled by immersing it in water and the current is applied during this time, leakage current can be significantly reduced.

Example Examples of the present invention will be described in detail below.

The basic configuration of the solid electrolytic capacitor according to this embodiment is, for example, in the case of a wound aluminum electrolytic capacitor, an aluminum etched group having an anodized film on the surface by anodizing (chemical formation) is used as the first electrode, and an aluminum etch group is used as the first electrode. It has a TCNQ salt between the counter electrodes arranged and is coated.

Normally, TCNQ salt is impregnated between the anode and cathode by heating and melting, and after adhesion, it is cooled and solidified using a coolant.
A feature of this embodiment is that the process is performed in the process of cooling and solidifying the CNQ salt after it adheres to the electrode. By doing this, the aging time is omitted and work efficiency is greatly improved. An electrolytic capacitor unit was used. T.C.
NQ salts include inamylisoquinolium (TCNQ,
)t was used. When heated and melted at 260°C, impregnated, and cooled with water, the capacity of 120Hg was 2,
A capacitor of 8 μF and a loss of 0.5% was obtained. If you cover this as it is with epoxy resin and measure the leakage current, for example, when 16V is applied, the two-minute value is 500 μN ~
It varies within a range of several μA. This at 85℃,
When aging treatment is performed for 2 hours with 20V applied, 0.1μ
It can be reduced before and after entering.

Here, the TCNQ salt was melted and immediately after impregnation, a voltage of 20 V was applied, the solution was cooled and solidified in water, and after the solidification was completed, the current application was stopped. Furthermore, after performing exterior treatment with epoxy resin, we measured the leakage current and found that the value for 2 minutes after applying 16V was 0.
．． It was in the range of 1 to 1 μ people. The test was conducted with 10 samples, and all of them were able to reduce leakage current.

In the above embodiment, the case where aging is performed during cooling and solidification is described, but it is also possible to perform aging in a molten state and then cool and solidify.

Effects of the Invention In short, the present invention combines TCNQ salt into a capacitor unit
/C is impregnated and then energized during the process of melting or cooling and solidifying, which reduces leakage current and reduces the number of capacitor manufacturing steps.

Claims (2)

[Claims] (1) a first electrode having an oxide film on its surface;
7, 7 between the electrode and the second electrode provided oppositely.
, 8. A solid characterized in that a solid electrolyte based on an 8-tetracyanoquinodimethane salt is impregnated and adhered by thermal melting, and the solid electrolyte is subjected to an aging treatment during the process of cooling and solidifying the solid electrolyte in a molten state or from a molten state. Method of manufacturing electrolytic capacitors. (2) The method for manufacturing a solid electrolytic capacitor according to claim 1, characterized in that water is used as a coolant for cooling and solidifying.