Flame-retardant electrolytic capacitor

Patent metadata

Field	Value
Publication number	US-9496092-B2
Application number	US-201314411414-A
Country	US
Kind code	B2
Filing date	Jul 1, 2013
Priority date	Aug 10, 2012
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

Provided is a flame-retardant electrolytic capacitor which is capable of maintaining flame-retardant effect even after a prolonged period of time. This is an electrolytic capacitor comprising an anode foil that is provided with an oxide film on the surface, a cathode foil, a separator, and an electrolytic solution that contains a solute in a solvent, wherein a phosphoric acid ester amide represented by the following general formula (1) is contained in the electrolytic solution:

in which n is 1 or 2, and R 1 and R 2 each independently represent a linear or branched alkyl group having 1 to 10 carbon atoms, and Rf represents a linear or branched fluoroalkyl group having 1 to 10 carbon atoms or a linear or branched alkyl group having 1 to 10 carbon atoms).

First claim

The invention claimed is:

1. A flame-retardant electrolytic capacitor comprising:
an anode foil that is provided with an oxide film on the surface;
a cathode foil;
a separator; and
an electrolytic solution that contains a solute in a solvent,
wherein a phosphoric acid ester amide represented by the following general formula (1) or the following general formula (2) is contained in the electrolytic solution:

in which n is 1 or 2, and R 1 and R 2 each independently represent a linear or branched alkyl group having 1 to 10 carbon atoms, and Rf represents a linear or branched fluoroalkyl group having 1 to 10 carbon atoms or a linear or branched alkyl group having 1 to 10 carbon atoms;

in which n is 1 or 2, and A represents a polymethylene group having 4 to 7 carbon atoms, a group in which at least one position of the C—C bonds in a polymethylene group having 4 to 7 carbon atoms is a C—O—C bond, a group in which at least one position of the C—C bonds in a polymethylene group having 4 to 7 carbon atoms is a C—NH—C bond, or a group in which at least one position of the C—C bonds in a polymethylene group having 4 to 7 carbon atoms is a C—N(CH 3 )—C bond, and Rf represents a linear or branched fluoroalkyl group having 1 to 10 carbon atoms or a linear or branched alkyl group having 1 to 10 carbon atoms.

2. The flame-retardant electrolytic capacitor according to claim 1 , wherein the phosphoric acid ester amide is represented by the following general formula (3) or the following general formula (4):

in which R 2 ′ and R 2 ′ each independently represent a linear or branched alkyl group having 1 to 10 carbon atoms, and Rf′ represents a linear or branched fluoroalkyl group having 1 to 10 carbon atoms;

in which A represents a polymethylene group having 4 to 7 carbon atoms, a group in which at least one position of the C—C bonds in a polymethylene group having 4 to 7 carbon atoms is a C—O—C bond, a group in which at least one position of the C—C bonds in a polymethylene group having 4 to 7 carbon atoms is a C—NH—C bond, or a group in which at least one position of the C—C bonds in a polymethylene group having 4 to 7 carbon atoms is a C—N(CH 3 )—C bond, and Rf′ represents a linear or branched fluoroalkyl group having 1 to 10 carbon atoms.

3. The flame-retardant electrolytic capacitor according to claim 1 , wherein the phosphoric acid ester amide represented by the general formula (1) or (2) is contained at 5 to 30 wt % of the total electrolytic solution.

4. The flame-retardant electrolytic capacitor according to claim 1 , wherein a phosphate diester anion represented by the following general formula (5) is further contained in the electrolytic solution:

in which Rf 1 and Rf 2 represents a linear or branched fluoroalkyl group having 1 to 10 carbon atoms or a linear or branched alkyl group having 1 to 10 carbon atoms.

5. The flame-retardant electrolytic capacitor according to claim 4 , wherein the phosphate diester anion represented by the general formula (5) is contained at up to 50 wt % of the total electrolytic solution.

6. The flame-retardant electrolytic capacitor according to claim 1 , wherein moisture content in an element of the electrolytic capacitor is 10 wt % or less.

7. The flame-retardant electrolytic capacitor according to claim 2 , wherein the phosphoric acid ester amide represented by the general formula (3) or (4) is contained at 5 to 30 wt % of the total electrolytic solution.

8. The flame-retardant electrolytic capacitor according to claim 2 , wherein a phosphate diester anion represented by the following general formula (5) is further contained in the electrolytic solution:

in which Rf 1 and Rf 2 represents a linear or branched fluoroalkyl group having 1 to 10 carbon atoms or a linear or branched alkyl group having 1 to 10 carbon atoms.

9. The flame-retardant electrolytic capacitor according to claim 3 , wherein a phosphate diester anion represented by the following general formula (5) is further contained in the electrolytic solution:

in which Rf 1 and Rf 2 represents a linear or branched fluoroalkyl group having 1 to 10 carbon atoms or a linear or branched alkyl group having 1 to 10 carbon atoms.

10. The flame-retardant electrolytic capacitor according to claim 7 , wherein a phosphate diester anion represented by the following general formula (5) is further contained in the electrolytic solution:

in which Rf 1 and Rf 2 represents a linear or branched fluoroalkyl group having 1 to 10 carbon atoms or a linear or branched alkyl group having 1 to 10 carbon atoms.

11. The flame-retardant electrolytic capacitor according to claim 8 , wherein the phosphate diester anion represented by the general formula (5) is contained at up to 50 wt % of the total electrolytic solution.

12. The flame-retardant electrolytic capacitor according to claim 9 , wherein the phosphate diester anion represented by the general formula (5) is contained at up to 50 wt % of the total electrolytic solution.

13. The flame-retardant electrolytic capacitor according to claim 10 , wherein the phosphate diester anion represented by the general formula (5) is contained at up to 50 wt % of the total electrolytic solution.

14. The flame-retardant electrolytic capacitor according to claim 2 , wherein moisture content in an element of the electrolytic capacitor is 10 wt % or less.

Assignees

• Nippon Chemicon
• Tosoh F-Tech Inc

Inventors

• Ozawa Masashi
• Kawakami Junichi
• Mimura Hideyuki
• Eguchi Hisao

Classifications

• H01G9/035 Primary

  Liquid electrolytes, e.g. impregnating materials (H01G11/54 takes precedence) · CPC title

• H01G11/54

  Electrolytes · CPC title

• H01G9/145 Primary

  Liquid electrolytic capacitors (H01G11/00 takes precedence) · CPC title

• H01G11/58

  Liquid electrolytes · CPC title