Solid electrolytic capacitor and production method thereof

A technology of solid electrolysis and solid electrolyte layer, which is applied in the direction of solid electrolytic capacitors, electrolytic capacitors, capacitors, etc., can solve the problems of large intervals, reduced area of ​​dielectric materials, and reduced apparent ratio of capacitance, so as to achieve high reflow temperature and prevent The increase in leakage current and the effect of increasing the apparent ratio of capacitance

Active Publication Date: 2011-05-04
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has a problem in that the space portion in the interlayer gap of the layered structure members constituting the solid electrolyte layer is large
Although the inventors have found that the insulation can be improved by increasing the coating width of the insulating layer used for insulation / separation, this is not preferred because it results in a dielectric material area that can be effectively utilized in a solid electrolytic capacitor of a predetermined size The relative reduction of , and thus reduce the capacitance apparent ratio

Method used

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  • Solid electrolytic capacitor and production method thereof
  • Solid electrolytic capacitor and production method thereof
  • Solid electrolytic capacitor and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0310] A chemically formed aluminum foil (thickness: 100 µm) was cut into small pieces of size 3.5 mm (minor axis direction) x 11 mm (major axis direction). A polyimide solution was hoop-coated with a width of 1 mm on both surfaces of the foil so as to divide the surface into two 5 mm sections in the long-axis direction, and then dried to provide a mask. A portion (cathode constituting portion) having a size of 3.5 mm×5 mm of the chemically formed foil thus obtained was immersed in a 10% by mass ammonium adipate aqueous solution, and the cut portion was chemically formed by applying a voltage of 3.8 V to form Dielectric material oxide film. Thereafter, this part of the aluminum foil thus treated was dipped in the conductive composition 1 for 5 seconds, and dried at room temperature for 5 minutes. The surface of the dielectric layer formed on the layer having pores in the chemically formed aluminum foil after drying was measured by X-ray photoelectron spectroscopy (XPS), the S...

Embodiment 2

[0316] A portion (cathode constituting portion) having a size of 3.5 mm x 5 mm of chemically formed aluminum foil (where a mask was provided in the same manner as in Example 1) was treated in the same manner as in Example 1 and cut open. Part of the chemical formation to form a dielectric oxide film. The chemically formed part was then dipped in the conductive composition 1 for 5 seconds, dried at room temperature for 5 minutes, and then subjected to a dehydrogenation condensation reaction at 300°C for 15 minutes to allow crosslinking to proceed, thereby forming its own on the surface of the dielectric film. Self-doping conductive polymer with crosslinks between polymer chains (step 1).

[0317] Furthermore, a solid electrolyte was formed in the same manner as in Example 1 except that this operation was repeated once more.

[0318] Then, again chemical formation, coating of carbon paste and silver paste, lamination, connection of cathode lead end, encapsulation with epoxy res...

Embodiment 3

[0320] A part (cathode constituting part) having a size of 3.5 mm x 5 mm of the chemically formed aluminum foil (where a mask was provided in the same manner as in Example 1) was treated in the same manner as in Example 1 and cut open. Part of the chemical formation to form a dielectric oxide film. A total of 30 capacitors were completed in the same manner as in Example 1, except that the chemically formed aluminum foil was dipped in the conductive composition 2 for 5 seconds and dried at room temperature for 5 minutes, followed by a dehydrogenation condensation reaction at 250 °C 30 minutes to allow crosslinking to proceed, thereby forming a self-doping type conductive polymer having crosslinks between its polymer chains on the surface of the dielectric film. The characteristics of the obtained capacitor element were evaluated in the same manner as in Example 1. Tables 1 and 2 show these results.

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Abstract

The present invention relates to a solid electrolytic capacitor comprising a layer of self-doping type conductive polymer having a crosslink between polymer chains thereof on the dielectric film formed on a valve-acting metal. The present invention enables to stably produce thin capacitor elements suitable for laminated type solid electrolytic capacitors, showing less short-circuit failure and less fluctuation in the shape of element, which allows to increase the number of laminated elements in a solid electrolytic capacitor chip to make a capacitor having a high capacity, and having less fluctuation in equivalent series resistance.

Description

[0001] Cross References to Related Applications [0002] This application is an application filed pursuant to 35 U.S.C. Section 111(a) filed on July 1, 2005 pursuant to the requirements of 35 U.S.C. Section 119(e)(1) pursuant to 35 U.S.C.Section 111(b) Benefit of U.S. provisional applications 60 / 695,541 and 60 / 719,172 filed September 22, 2005. technical field [0003] The present invention relates to a solid electrolytic capacitor comprising a conductive polymer on a dielectric film and a method of making the same. Background technique [0004] In general, as shown in Figure 1, for example, the basic elements of a solid electrolytic capacitor are fabricated by forming a dielectric oxide on each side of an anode substrate (1) made of etched metal foil with a large specific surface area A film layer (2), on both sides of the dielectric oxide film layer (2), a solid semiconductor layer (hereinafter referred to as "solid electrolyte") (4) is formed as a counter electrode, and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/028H01G9/00H01G9/04C08G75/20C08G61/12H01G9/022H01G9/052H01G9/15
Inventor 齐田义弘福永宏史
Owner MURATA MFG CO LTD
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