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Solid electrolytic condenser and mfg. method thereof

A technology of solid electrolysis and manufacturing methods, applied in the direction of solid electrolytic capacitors, electrolytic capacitor manufacturing, electrolytic capacitors, etc., can solve the problems of dielectric layer damage, increase, and peeling off of each layer

Inactive Publication Date: 2007-01-17
NEC TOKIN TOYAMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0041] In this way, if the semiconductor layer (solid electrolyte layer) has a part with uneven layer thickness, the semiconductor layer (solid electrolyte layer) may be damaged by heat treatment in the resin coating process, and the layers may be peeled off or cracked.
[0042] In addition, due to damage to the semiconductor layer (solid electrolyte layer), the dielectric layer may also be damaged
Leakage current (hereinafter referred to as LC) increases due to the influence of heat in the stage of molding the exterior during capacitor manufacturing, during the soldering stage during capacitor mounting, or during use after capacitor mounting, so it is not ideal.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0161] The tantalum powder with a CV value of 50kcv / g embedded in the tantalum component lead is made into pellets and pressed, at a ratio of 10 -4 Sintering is carried out at a temperature of 1300-2000° C., preferably at a temperature of 1350° C., in a vacuum environment with high Pa, to obtain a porous anode body having a rectangular parallelepiped shape.

[0162] The aforementioned anode body was immersed in a 0.6 volume % phosphoric acid aqueous solution, and anodized at 33.7 V for 180 minutes to form a dielectric layer.

[0163] The obtained pellets with a dielectric layer formed on their surfaces were immersed in an aqueous solution containing 20% ​​by volume of PTFE powder and a small amount of surfactant (polyoxyethylene phenyl ether) for 5 minutes.

[0164] The impregnated pellets were dried in an oven at 240°C for 30 minutes. The porosity of the obtained porous body was 58% or more, and the average diameter of each hole of the porous body was 5.0×10 -7 m.

[0165]...

Embodiment 2

[0180] A solid electrolytic capacitor was produced by the same manufacturing method as in Example 1, except that PTFE in the porous body forming step was 10% by volume.

[0181] For the 10 capacitors thus produced having a 10V / 100µF capability, the average values ​​of the results of LC measurement with different voltages are as follows.

[0182] Voltage 1.5V LC0.1μA

[0183] Voltage 2.5V LC0.8μA

[0184] Voltage 4.0V LC23μA

[0185] Voltage 6.3V LC84μA

[0186] Voltage 10V LC350μA

[0187] The average value of the ESR measurement results for these 10 capacitors was 36 mΩ.

[0188] In addition, in the aforementioned manufacturing process, 2.80% of the 500 capacitors had LC increased after the resin sheathing process and became defective.

[0189] In addition, when the actual installation test (repeated twice at 260°C for 10 seconds) was carried out in a reverberatory furnace for acceptable products, 0% of the 500 products failed the capacitor function.

Embodiment 3

[0191] The steps up to the formation of the porous body were carried out in the same manufacturing method as in Example 1, and pellets were obtained after drying.

[0192] The dried pellets were dipped in a solution in which a 0.5% by weight aqueous solution of a methoxy-based silane coupling agent was adjusted to pH 4 with acetic acid for 15 minutes, dried naturally for 45 minutes, and then heated and dried at 125°C for 10 minutes. A silane coupling agent layer is formed on the dielectric layer and the dielectric layer.

[0193] On this porous layer and on the dielectric body layer, form the pellet of silane coupling agent layer, same as embodiment 1, be dissolved in the oxidant solution of 400g ferric benzene sulfonate in 1000g alcohol at normal temperature and be immersed in after 5 minutes, dry , Carry out the same process with embodiment 1 later, make solid electrolytic capacitor.

[0194] For the 10 capacitors thus produced having a 10V / 100µF capability, the average val...

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Abstract

A solid electrolytic capacitor is disclosed whose semiconductor layer has improved mechanical strength and which has LC characteristics stable at a low level, and a method for preparing the same is also disclosed. The solid electrolytic capacitor comprises: an anode body with an element lead wire partially inserted therein, said anode body made of a sintered valve metal and having a large number of voids; a dielectric layer formed over the surface of the anode body; a semiconductor layer including a porous phase so formed as to cover the dielectric layer and extend into the voids and an electrically conductive polymer so formed as to fill a plurality of through-holes of the porous phase with the electrically conductive polymer; a cathode body formed on the surface of the semiconductor layer.

Description

technical field [0001] The present invention relates to a solid electrolytic capacitor and a method of manufacturing the same. technical background [0002] In the past, solid electrolytic capacitors were composed of anode-dielectric body-semiconductor layer (solid electrolyte layer)-anode, and an oxide film ( Hereinafter referred to as a dielectric layer), a semiconductor layer (solid electrolyte layer) and a cathode are formed on the dielectric layer. [0003] Here, the valve action metal refers to a metal that can form an oxide film with a controllable thickness through anodic oxidation, and refers to Nb, Al, Ta, Ti, Hf, Zr, etc. In fact, two metals, Al and Ta, are mainly used. [0004] Among them, regarding Al, an etched foil is often used as an anode, and Ta is sintered to form a porous body, which is used as an anode. [0005] Among solid electrolytic capacitors, porous sintered electrolytic capacitors are in strong demand as components that meet the demands for mini...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/15H01G9/00H01G9/028H01G9/004H01G9/02H01G9/052
CPCH01G11/48H01G11/56H01G9/028H01G9/0036H01G9/004Y02E60/13
Inventor 高田大辅
Owner NEC TOKIN TOYAMA