SOLID ELECTROLYTIC CAPACITOR, METHOD FOR PRODUCING SAME, AND SOLUTION FOR SOLID ELECTROLYTIC CAPACITOR

• US 20110080691A1
• Filed: 10/05/2010
• Published: 04/07/2011
• Est. Priority Date: 10/06/2009
• Status: Active Grant

• Current Assignee: Shin-Etsu Polymer Company Limited (Shin-Etsu Chemical Company Limited)
• Original Assignee: Shin-Etsu Polymer Company Limited (Shin-Etsu Chemical Company Limited)
• Inventors: NING, Tailu, SHINGAI, Michiko, ODE, Sachiko
• Granted Patent: US 8,390,989 B2
• Time in Patent Office: Days
• US Class Current: 361/525
• CPC Class Codes: C08G 2261/3223 containing one or more sulfur atoms as the only heteroatom, e.g. thiophene
• CPC Class Codes: C08G 2261/76 crosslinking
• CPC Class Codes: C08K 5/053 Polyhydroxylic alcohols
• CPC Class Codes: C08L 25/18 Homopolymers or copolymers of aromatic monomers containing elements other than carbon and hydrogen
• CPC Class Codes: C08L 2666/06 Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof
• CPC Class Codes: C08L 65/00 Compositions of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain C08L7/00 - C08L57/00, C08L61/00 take precedence; Compositions of derivatives of such polymers
• CPC Class Codes: H01G 9/0036 Formation of the solid electrolyte layer
• CPC Class Codes: H01G 9/028 Organic semiconducting electrolytes, e.g. TCNQ

Abstract

A solid electrolytic capacitor that is able to maintain a high capacitance and low ESR, and also exhibits a high degree of heat resistance. The solid electrolytic capacitor 10 comprises at least an anode body 11 composed of a porous material, a dielectric layer 12 formed on the surface of the anode body 11, and a cathode body 13b, wherein the solid electrolytic capacitor has a solid electrolyte layer 13a formed in contact with the dielectric layer 12, the solid electrolyte layer 13a comprises at least a hydroxy compound having three or more hydroxyl groups, and the hydroxy compound has a melting point of not less than 170° C.

Claims

1. A solid electrolytic capacitor comprising at least an anode body composed of a porous material, a dielectric layer formed on a surface of the anode body, and a cathode body, wherein

the solid electrolytic capacitor has a solid electrolyte layer formed in contact with the dielectric layer, the solid electrolyte layer comprises at least a hydroxy compound having three or more hydroxyl groups, and the hydroxy compound has a melting point of not less than 170°

C.

2. The solid electrolytic capacitor according to claim 1, wherein the hydroxy compound is pentaerythritol.

3. The solid electrolytic capacitor according to claim 1, wherein the solid electrolyte layer comprises one or more compounds selected from the group consisting of ether compounds, compounds having an amide group, compounds having an imide group, lactam compounds, compounds having a glycidyl group, acrylic compounds, polyesters, polyurethanes, acrylic resins, epoxy resins, polyamides, polyacrylamides and silane coupling agents.

4. The solid electrolytic capacitor according to claim 1, wherein the solid electrolyte layer comprises a conductive polymer.

5. The solid electrolytic capacitor according to claim 4, wherein the conductive polymer is a thiophene-based conductive polymer.

6. The solid electrolytic capacitor according to claim 1, wherein a water content within the solid electrolyte layer is adjusted to a value of not more than 7% by mass.

7. The solid electrolytic capacitor according to claim 1, having a solid electrolyte layer comprising a hydroxyl compound having three or more hydroxyl groups that is formed in contact with the cathode body.

8. The solid electrolytic capacitor according to claim 1, further comprising an electrolyte solution.

9. A solution for a solid electrolytic capacitor that is used for forming a solid electrolyte layer of a solid electrolytic capacitor, wherein

the solution for a solid electrolytic capacitor comprises at least a hydroxy compound having at three or more hydroxyl groups, and the hydroxy compound has a melting point of not less than 170°

C.

10. A method for producing a solid electrolytic capacitor comprising at least an anode body composed of a porous material, a dielectric layer formed on a surface of the anode body, and a cathode body, wherein

the method comprises a step of forming, in contact with the dielectric layer, a solid electrolyte layer comprising at least a hydroxy compound that has three or more hydroxyl groups and has a melting point of not less than 170°

C.

11. A solution for a solid electrolytic capacitor comprising, at least, water and/or a mixed solvent containing water,

a conductive complex of a cationized conductive polymer and a polymer anion, and

a hydroxy compound having a melting point of not less than 170°

C., wherein

a degree of acidity of the solution is adjusted to a value within a range from pH 3 to pH 13.

12. The solution for a solid electrolytic capacitor according to claim 11, wherein the hydroxy compound is pentaerythritol.

13. The solution for a solid electrolytic capacitor according to claim 11, wherein a viscosity of the solution is not more than 30 mPa·

s.

14. A solid electrolytic capacitor produced by winding a porous anode foil having a dielectric layer formed thereon, and a cathode foil, with a separator having a solid electrolyte supported thereon disposed therebetween, wherein

the solid electrolyte is formed by permeation of the solution for a solid electrolytic capacitor according to claim 11.

15. The solid electrolytic capacitor according to claim 14, wherein a water content within the solid electrolyte is adjusted to a value of not more than 7% by mass.

16. The solid electrolytic capacitor according to claim 15, wherein a water content within the solid electrolyte is adjusted to a value of not more than 4% by mass.

17. A method for producing a solid electrolytic capacitor by winding a porous anode foil having a dielectric layer formed thereon, and a cathode foil, with a separator having a solid electrolyte supported thereon disposed therebetween, wherein

the method comprises a step of forming the solid electrolyte by permeation of the solution for a solid electrolytic capacitor according to claim 11.