IP Library › Granted Patent US 12,500,041
Granted Patent B2
US 12,500,041 · App. 18/569,030 · Granted Dec 16, 2025

Electrolytic capacitor

Inventors: Tsutomu Kaneko (Ina, JP); Yoshishige Sakurai (Ina, JP)
Assignees: RUBYCON CORPORATION; HEC KOUYO JAPAN CO., LTD.
H01G9/0525H01G9/035H01G9/045H01G9/145
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Quick Facts
Patent No.
US 12,500,041
App. No.
18/569,030
Granted
Dec 16, 2025
Kind
B2
Abstract

The present invention addresses a problem of providing an electrolytic capacitor with which an etching treatment of an electrode material is not required and with which it is possible to achieve higher capacitance than conventional electrolytic capacitors using electrode foils having surface areas increased only by etching. This electrolytic capacitor, as a solution, includes a capacitor element having an anode foil, a cathode foil, and separators interposed between the anode foil and the cathode foil; and an electrolytic solution impregnated in the capacitor element, wherein the anode foil or the cathode foil has a sintered material formed with sintered particles of power of at least one kind of aluminum and an aluminum alloy.

Claims (9)

1 . An electrolytic capacitor having a capacitor element having an anode foil, a cathode foil and a separator interposed between the anode foil and the cathode foil and an electrolytic solution impregnated in the capacitor element

which is characterized in that the anode foil or the cathode foil has a sintered material formed with sintered particles of powder of at least one kind of aluminum and an aluminum alloy,

a specific resistance of the electrolytic solution is 400 to 1500 Ω·cm, and

an average particle size (D50) of the powder or the sintered particles is 6 μm or less.

2 . The electrolytic capacitor according to claim 1 which is characterized in that the anode foil or the cathode foil is formed with the sintered material and a base material supporting the sintered material.

3 . The electrolytic capacitor according to claim 1 which is characterized in that

the electrolytic solution contains

a solvent containing an organic solvent or a solvent containing a mixture of water and an organic solvent and

at least one kind of electrolyte selected from the group consisting of an organic acid or an organic acid salt, an inorganic acid or an inorganic acid salt and a mixture of an organic acid or an organic acid salt and an inorganic acid or an inorganic acid salt.

Assignments (3)
CHANGE OF NAME Recorded Oct 21, 2025
From: YOKO-TOYO METALS CO., LTD.
To: HEC KOUYO JAPAN CO., LTD.
Reel/Frame 072992/0034 →
CHANGE OF NAME Recorded Oct 14, 2025
From: YOKO-TOYO METALS CO ., LTD.
To: HEC KOUYO JAPAN CO. , LTD.
Reel/Frame 073065/0619 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 11, 2023
From: KANEKO, TSUTOMU; SAKURAI, YOSHISHIGE
To: RUBYCON CORPORATION; YOKO-TOYO METALS CO., LTD.
Reel/Frame 065828/0519 →
Priority Claims (2)
WO PCT/JP2021/026547 · Jul 15, 2021 · international
WO PCT/JP2022/022316 · Jun 1, 2022 · international
Continuity (1)
Related Publication 20240282534A1 · Aug 22, 2024
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