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Electrolytic capacitor

A technology of electrolytic capacitors and electrolytes, applied in the direction of electrolytic capacitors, solid electrolytic capacitors, liquid electrolytic capacitors, etc., which can solve the problems of slow increase in ESR of electrolytic capacitors and deterioration of conductive polymers over time

Active Publication Date: 2018-10-26
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the conductive polymer deteriorates over time, and the ESR of the electrolytic capacitor gradually increases

Method used

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  • Electrolytic capacitor
  • Electrolytic capacitor
  • Electrolytic capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] A wound electrolytic capacitor (Φ10 mm×L (length) 10 mm) with a rated voltage of 80 V and a rated capacitance of 33 μF was produced in the following manner.

[0068] (Preparation of anode body)

[0069] The aluminum foil having a thickness of 100 μm was etched to roughen the surface of the aluminum foil. A dielectric layer is formed by chemically converting the surface of the roughened aluminum foil. The chemical conversion treatment was performed by immersing the aluminum foil in an ammonium adipate solution and applying a voltage of 150 V to the aluminum foil. Thereafter, the aluminum foil was cut into 6 mm×120 mm to prepare an anode body.

[0070] (Preparation of cathode body)

[0071] The aluminum foil with a thickness of 50 μm was etched to roughen the surface of the aluminum foil. Thereafter, the aluminum foil was cut into 6 mm×120 mm to prepare a cathode body.

[0072] (Manufacturing of wound body)

[0073] The anode lead tab and the cathode lead tab are conn...

Embodiment 2

[0085] Without changing the molar ratio of the second sulfonic acid to the alkali component, except that hexanesulfonic acid was used instead of 5-sulfosalicylic acid, the same operation as in Example 1 was performed to manufacture electrolytic capacitor A2, and the same procedure was carried out. Evaluation.

Embodiment 3

[0087] Without changing the molar ratio of the second sulfonic acid to the alkali component, except that p-toluenesulfonic acid was used instead of 5-sulfosalicylic acid, the same operation was performed as in Example 1 to manufacture electrolytic capacitor A3, and the same procedure was carried out. Evaluation. The results are shown in Table 1.

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Abstract

An electrolytic capacitor is provided with: a positive electrode body having a dielectric layer; a solid electrolyte layer that is in contact with the dielectric layer; and an electrolyte solution. The solid electrolyte layer contains a [pi]-conjugated conductive polymer and a first sulfonic acid. The electrolyte solution contains a solvent and an acid component; and the acid component contains asecond sulfonic acid.

Description

technical field [0001] The present invention relates to an electrolytic capacitor having a solid electrolyte layer and an electrolytic solution. Background technique [0002] Electrolytic capacitors including an anode body formed with a dielectric layer, a solid electrolyte layer and an electrolyte solution formed so as to cover at least a part of the dielectric layer have attracted attention as capacitors with a small size, large capacity, and low ESR (equivalent series resistance). . [0003] The solid electrolyte layer uses a π-conjugated conductive polymer to which a dopant has been imparted. It is known that a dopant undergoes a dedoping phenomenon in which it is gradually released into an electrolytic solution. As a result, the conductive polymer deteriorates over time, and the ESR of the electrolytic capacitor gradually increases. [0004] Therefore, an attempt has been made to suppress the dedoping phenomenon by including an acid component in the electrolytic solu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/035H01G9/028
CPCH01G9/028H01G9/035H01G9/0036H01G9/15C08L65/00H01G9/025C08G61/126C08G2261/3223C08G2261/794C08K5/20H01G9/145H01G11/48
Inventor 椿雄一郎青山达治
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD