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Anode body of solid electrolytic capacitor

A technology for anode bodies and capacitors, applied in the field of solid electrolytic capacitors, which can solve the problems of large leakage current, unrecorded tungsten, and insufficient leakage current, and achieve the effects of small LC, suppression of poor appearance, and stable capacity

Inactive Publication Date: 2017-12-12
RESONAC HOLDINGS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Using tungsten as the valve action metal, an electrolytic capacitor using a sintered body of tungsten powder as an anode body, compared with an electrolytic capacitor obtained by using tantalum powder with the same particle size and the same volume as an anode body obtained under the same chemical conversion voltage, can obtain Large capacity, but large leakage current (LC), cannot be used as an electrolytic capacitor for practical use
In order to improve this, a capacitor using an alloy of tungsten and other metals has been studied. Although the leakage current is slightly improved, it is not sufficient (Japanese Patent Laid-Open No. 2004-349658 (US6876083); Patent Document 1)
[0005] In Patent Document 2 (Japanese Unexamined Patent Publication No. 2003-272959), it is disclosed that the 3 , W 2 N, WN 2 capacitors with tungsten foil electrodes in the dielectric layer, but there is no solution for the leakage current
[0006] In addition, in Patent Document 3 (International Publication No. 2004 / 055843 pamphlet (US7154743)), an electrolytic capacitor using an anode selected from tantalum, niobium, titanium, and tungsten is disclosed, but the use of tungsten is not described in this specification. specific example

Method used

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  • Anode body of solid electrolytic capacitor
  • Anode body of solid electrolytic capacitor

Examples

Experimental program
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Effect test

Embodiment 1～9 and comparative example 1～2

[0099] Potassium carbonate (commercially available reagent) was dissolved in silicon (commercially available with an average particle ) solution mixed thoroughly, at 80 ℃, 10 2 After drying under reduced pressure at Pa, at 10 -1 Under the reduced pressure of Pa, place it at 1400°C for 30 minutes, and after returning to room temperature, the lumps are crushed and classified to obtain an average particle size of 90 μm (particle size is 25-160 μm, and the specific surface area is 0.5m2). 2 / g) of granulated powder. Here, by changing the amount of silicon added to the tungsten primary powder and the amount of potassium carbonate in the aqueous solution, the amount of silicon and potassium in the granulated powder is changed (the amount of silicon: 0 to 7.0% by mass, the amount of potassium: 0 to 0.2% by mass). Table 1 shows the measured values ​​in the granulated powder of each example. The determination was carried out by IPC spectroscopic analysis.

[0100] Next, after plan...

Embodiment 10～18 and comparative example 3～4

[0107] To 100 g of primary tungsten powder with an average particle diameter of 0.3 μm obtained by reducing tungsten oxide with hydrogen, potassium carbonate (commercially available reagent ) solution, at 80°C, 10 2 After drying under reduced pressure at Pa, at 10 -1 Under the reduced pressure of Pa, place it at 1400°C for 30 minutes, and after returning to room temperature, the lumps are crushed and classified to obtain an average particle size of 120 μm (particle size is 30-180 μm, and the specific surface area is 1.8m2). 2 / g) of granulated powder. Here, by changing the amount of silicon added to the primary tungsten powder and the amount of potassium carbonate in the aqueous solution, the amount of silicon and potassium in the granulated powder was changed (amount of silicon: 0 to 7.0% by mass, amount of potassium: 0 to 0.2 quality%). Table 2 shows the values ​​in the granulated powders of the respective examples measured by IPC spectroscopic analysis.

[0108] Next, a...

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Abstract

The present invention provides: an anode body of a capacitor produced by chemical conversion treatment of a sintered body of tungsten powder, characterized in that the anode body is doped with 0.003% by mass or more and less than 0.3% by mass. Potassium in an amount of mass %; a method for manufacturing an anode body of a capacitor in which a sintered body of tungsten powder is sintered and subjected to chemical conversion treatment, which has an amount of 0.003 to 0.3 mass % doped in the anode body a potassium process; and a solid electrolytic capacitor using the anode body. The capacitor of the present invention does not cause appearance defects in the surface of the tungsten powder sintered body on which the leads are implanted and the surface perpendicular to the implanted surface, which is close to the implanted surface.

Description

technical field [0001] The present invention relates to an anode body of a capacitor in which tungsten powder is sintered to form a sintered body, a manufacturing method thereof, and a solid electrolytic capacitor using the anode body. Background technique [0002] With the miniaturization, high speed, and weight reduction of electronic equipment such as mobile phones and personal computers, the capacitors used in these electronic equipment are also required to be smaller and lighter, with larger capacity and lower ESR (equivalent series resistance) ). [0003] An electrolytic capacitor has a conductor (anode body) as one electrode, and is composed of the one electrode, a dielectric layer formed on the surface of the electrode, and the other electrode (semiconductor layer) provided on the dielectric layer. As such a capacitor, there has been proposed an electrolytic capacitor in which the anode body of the capacitor composed of a sintered body of valve action metal powder s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/052H01G9/00
CPCH01G9/0525H01G9/0029H01G9/0036H01G9/042H01G9/052H01G9/15
Inventor 内藤一美矢部正二
Owner RESONAC HOLDINGS CORPORATION