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US 12,614,679 B2Granted
Electrode foil for electrolytic capacitor, electrolytic capacitor, method for producing electrode foil for electrolytic capacitor, and method for producing electrolytic capacitor
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsMitsuhisa Yoshimura, Miwa Ogawa, Naomi Kurihara
Life of this patent
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Abstract
An electrode foil for an electrolytic capacitor includes: a metal foil with a first main surface and a second main surface that is opposite to the first main surface, having a first porous portion on the first main surface side and a second porous portion on the second main surface side; a first dielectric layer that covers a surface of the first porous portion; and a second dielectric layer that covers a surface of the second porous portion. A thickness F1 of the first dielectric layer and a thickness F2 of the second dielectric layer satisfy the relationship 0.75≤F1/F2≤0.97.
Claims33
An electrode foil for an electrolytic capacitor, comprising:
- a metal foil with a first main surface and a second main surface that is opposite to the first main surface, having a first porous portion on the first main surface side and a second porous portion on the second main surface side;
- a first dielectric layer that covers a surface of the first porous portion;
- and
- a second dielectric layer that covers a surface of the second porous portion,
- wherein a thickness F1 of the first dielectric layer and a thickness F2 of the second dielectric layer satisfy a relationship:
- 0.75
- ≤
- F
-
- 1
- /
- F
-
- 2
- ≤
- 0.97
- .
14 more elements
An electrode foil for an electrolytic capacitor, comprising:
- a metal foil with a first main surface and a second main surface that is opposite to the first main surface, having a first porous portion on the first main surface side and a second porous portion on the second main surface side;
- a first dielectric layer that covers a surface of the first porous portion;
- and
- a second dielectric layer that covers a surface of the second porous portion,
- wherein a capacitance C1 that appears on the first main surface side having the first dielectric layer and a capacitance C2 that appears on the second main surface side having the second dielectric layer satisfy a relationship:
- 0.8
- ≤
- C
-
- 2
- /
- C
-
- 1
- ≤
- 0.99
- .
14 more elements
A method for producing an electrode foil for an electrolytic capacitor, comprising:
- a first step of preparing a metal foil with a first main surface and a second main surface that is opposite to the first main surface, having a first porous portion on the first main surface side and a second porous portion on the second main surface side;
- and
- a second step of individually forming a first dielectric layer that covers a surface of the first porous portion and a second dielectric layer that covers a surface of the second porous portion,
- wherein the second step includes:
- a second A step of forming the first dielectric layer at a first temperature TA1° C. through atomic layer deposition;
- and
- a second B step of forming the second dielectric layer at a second temperature TA2° C. through atomic layer deposition.
4 more elements
A method for producing an electrode foil for an electrolytic capacitor, comprising:
- a first step of preparing a metal foil with a first main surface and a second main surface that is opposite to the first main surface, having a first porous portion on the first main surface side and a second porous portion on the second main surface side;
- and
- a second step of individually forming a first dielectric layer that covers a surface of the first porous portion and a second dielectric layer that covers a surface of the second porous portion,
- wherein the second step includes:
- a second A step of forming the first dielectric layer at a first temperature TA1° C. through atomic layer deposition;
- and
- a second B step of forming the second dielectric layer at a second temperature TA2° C. through atomic layer deposition,
- wherein the second A step is followed by the second B step, and
- the second B step also serves as a step of performing heat treatment on the first main surface having the first dielectric layer at the second temperature TA2 to increase a crystallinity of the first dielectric layer.
6 more elements
A method for producing an electrode foil for an electrolytic capacitor, comprising:
- a first step of preparing a metal foil with a first main surface and a second main surface that is opposite to the first main surface, having a first porous portion on the first main surface side and a second porous portion on the second main surface side;
- and
- a second step of individually forming a first dielectric layer that covers a surface of the first porous portion and a second dielectric layer that covers a surface of the second porous portion,
- wherein the second step includes:
- a second A step of forming the first dielectric layer at a first temperature TA1° C. through atomic layer deposition;
- and
- a second B step of forming the second dielectric layer at a second temperature TA2° C. through atomic layer deposition,
- wherein the second A step is followed by the second B step, and
- the second B step also serves as a step of performing heat treatment on the first main surface having the first dielectric layer at the second temperature TA2 to increase a crystallinity of the first dielectric layer,
- wherein the second A step also serves as a step of performing heat treatment on the second main surface at the first temperature TA1 to form an oxide film of a metal portion constituting the second porous portion on the surface of the second porous portion, and
- in the second B step, the second dielectric layer is formed on the surface of the second porous portion with the oxide film interposed therebetween.
8 more elements
A method for producing an electrode foil for an electrolytic capacitor, comprising:
- a first step of preparing a metal foil with a first main surface and a second main surface that is opposite to the first main surface, having a first porous portion on the first main surface side and a second porous portion on the second main surface side;
- and
- a second step of individually forming a first dielectric layer that covers a surface of the first porous portion and a second dielectric layer that covers a surface of the second porous portion,
- wherein the second step includes:
- a second A step of forming the first dielectric layer at a first temperature TA1° C. through atomic layer deposition;
- and
- a second B step of forming the second dielectric layer at a second temperature TA2° C. through atomic layer deposition,
- wherein the first temperature TA1 and the second temperature TA2 satisfy relationships:
- 0
- ≤
- ❘
- "\[LeftBracketingBar]"
- TA
-
- 1
- -
- TA
-
- 2
- ❘
- "\[RightBracketingBar]"
- ≤
- 50
- ;
-
- 90
- ≤
- TA
-
- 1
- ≤
- 400
- ;
- and
-
- 90
- ≤
- TA
-
- 2
- ≤
- 400.
39 more elements
A method for producing an electrode foil for an electrolytic capacitor, comprising:
- a first step of preparing a metal foil with a first main surface and a second main surface that is opposite to the first main surface, having a first porous portion on the first main surface side and a second porous portion on the second main surface side;
- and
- a second step of individually forming a first dielectric layer that covers a surface of the first porous portion and a second dielectric layer that covers a surface of the second porous portion,
- wherein a thickness F1 of the first dielectric layer and a thickness F2 of the second dielectric layer satisfy a relationship:
- 0.75
- ≤
- F
-
- 1
- /
- F
-
- 2
- ≤
- 0.97
- .
13 more elements
A method for producing an electrode foil for an electrolytic capacitor, comprising:
- a first step of preparing a metal foil with a first main surface and a second main surface that is opposite to the first main surface, having a first porous portion on the first main surface side and a second porous portion on the second main surface side;
- and
- a second step of individually forming a first dielectric layer that covers a surface of the first porous portion and a second dielectric layer that covers a surface of the second porous portion,
- wherein a capacitance C1 that appears on the first main surface side having the first dielectric layer and a capacitance C2 that appears on the second main surface side having the second dielectric layer satisfy a relationship:
- 0.8
- ≤
- C
-
- 2
- /
- C
-
- 1
- ≤
- 0.99
- .
13 more elements
A system for producing an electrode foil for an electrolytic capacitor, comprising:
- a film-forming portion that performs atomic layer deposition on a metal foil with a first main surface and a second main surface that is opposite to the first main surface, having a first porous portion on the first main surface side and a second porous portion on the second main surface side, thereby individually forming a first dielectric layer that covers a surface of the first porous portion and a second dielectric layer that covers a surface of the second porous portion.
Dependencies are inferred from the claim text.