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Solid electrolytic capacitor and mfg. method thereof

A technology of solid electrolysis and manufacturing method, applied in solid electrolytic capacitors, electrolytic capacitors, capacitor manufacturing and other directions, can solve the problem of difficulty in reducing ESR in high frequency region, and achieve the effect of reducing equivalent series impedance and reducing equivalent series impedance

Inactive Publication Date: 2004-10-06
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to reduce the ESR in the high frequency region

Method used

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  • Solid electrolytic capacitor and mfg. method thereof
  • Solid electrolytic capacitor and mfg. method thereof
  • Solid electrolytic capacitor and mfg. method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0033] Next, the solid electrolytic capacitor according to Embodiment 1 of the present invention and its manufacturing method will be described.

[0034] FIG. 1 is a structural diagram of a solid electrolytic capacitor according to an embodiment of the present invention.

[0035] As shown in FIG. 1 , a solid electrolytic capacitor has a structure in which a dielectric layer 3 and a metal layer 4 are sequentially formed on the surface of an anode 2 .

[0036] The anode 2 is connected to the anode terminal 1 , and the metal layer 4 is connected to the cathode terminal 5 through the conductive adhesive 8 . In addition, a mold sheath resin 9 is formed to draw out the ends of the anode terminal 1 and the cathode terminal 5 to the outside.

[0037] The anode 2 is formed from a porous sintered body of tantalum particles. Compatibilization is achieved due to the large surface area of ​​the porous sintered body of tantalum particles. In addition, the anode 2 is not limited to be mad...

Embodiment approach 2

[0058] Next, the fixed electrolytic capacitor and its manufacturing method according to Embodiment 2 of the present invention will be described.

[0059] The solid electrolytic capacitor of this embodiment differs from the solid electrolytic capacitor of Embodiment 1 in the structure and formation method of metal layer 4 described below.

[0060] In this embodiment, the anode 2 formed with the dielectric layer 3 is immersed in an ammoniacal silver nitrate aqueous solution, glucose is added, and the metal layer 4 is formed on the dielectric layer 3 by electroless plating. In addition, the ammoniacal silver nitrate aqueous solution is produced by adding ammonia water to the silver nitrate aqueous solution.

[0061] In this embodiment, the metal layer 4 is formed on the dielectric layer 3 by electroless plating to obtain a highly conductive electrolyte. As a result, a solid electrolytic capacitor with reduced ESR in a high-frequency region can be obtained.

[0062] In the follo...

Embodiment 1～7

[0064] In the present example, a solid electrolytic capacitor 100 was manufactured as follows according to the manufacturing method of Embodiment 1 above, and ESR was evaluated.

[0065] First, in Examples 1 to 7, the average particle diameters of the silver particles are respectively taken as 0.009 μm, 0.01 μm, 0.03 μm, 0.05 μm, 0.06 μm, 0.07 μm and 0.09 μm, and the solid electrolytic capacitors are made under the following conditions and methods 100.

[0066] Using polyethyleneimine as a protective colloid, silver particles and polyethyleneimine were mixed in proportions of 70% by weight and 30% by weight, respectively. The mixture was mixed with ethanol as an organic solvent at a ratio of 60% by weight and 40% by weight, respectively, to prepare a silver paste.

[0067] Then, the anode 2 is formed by sintering the powder of tantalum particles to form a porous sintered body, and the anode 2 is anodized in a phosphoric acid aqueous solution to form a dielectric layer 3 made ...

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Abstract

A solid electrolytic capacitor has a structure in which a dielectric layer and a metal layer are formed in this order on the surface of an anode. The anode is composed of a porous sinter of tantalum particles. The dielectric layer is composed of a dielectric oxide film formed by anodizing the surface of the anode in an aqueous solution consisting of phosphoric acid, for example. The metal layer is formed by preparing a silver paste by mixing silver particles having an average particle diameter of not larger than 0.05 mum, a protective colloid, and an organic solvent, and applying the silver paste on the surface of the dielectric layer, and drying the silver paste at a temperature of 150 DEG C. or higher. Further, the anode is connected with an anode terminal, and the metal layer is connected with a cathode terminal through a conductive adhesive.

Description

technical field [0001] The present invention relates to a solid electrolytic capacitor and a method of manufacturing the same. Background technique [0002] In recent years, as the frequency of electronic equipment such as personal computers has become higher and higher, it is necessary to supply current to the circuit instantaneously, so the development of a solid electrolytic capacitor with a small equivalent series resistance (hereinafter referred to as ESR) value in the high-frequency region has been desired. [0003] Here, ESR is the sum of the dielectric loss, the specific impedance of the electrolyte, and the contact impedance between the electrolyte and the cathode. In the high-frequency region, the specific impedance of the electrolyte and the contact impedance between the electrolyte and the cathode dominate. [0004] Usually, solid electrolytic capacitors use a product in which a conductive material such as manganese dioxide is bonded to the surface of an anodize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/04H01G9/00H01G9/042H01G9/15H01G13/00
CPCH01G9/15H01G9/0425Y10T29/417H01G9/042
Inventor 高谷和宏矢野睦木本卫
Owner SANYO ELECTRIC CO LTD