Electrolytic capacitor, and production method therefor
An electrolytic capacitor includes: an anode body; a dielectric layer formed on the anode body; a first conductive polymer layer covering at least a part of the dielectric layer; a second conductive polymer layer covering at least a part of the first conductive polymer layer; and an intermediate layer formed between the first conductive polymer layer and second conductive polymer layer. The intermediate layer includes a cation agent containing a cationic group, and an anion agent containing a first anionic group and a second anionic group. The first anionic group is higher in electron-withdrawing property than the second anionic group. In the intermediate layer, a total of a number of the first anionic group and a number of the second anionic group is larger than a number of the cationic group.
1. An electrolytic capacitor comprising:
an anode body;
a dielectric layer formed on the anode body;
a first conductive polymer layer covering at least a part of the dielectric layer;
a second conductive polymer layer covering at least a part of the first conductive polymer layer; and
an intermediate layer formed between the first conductive polymer layer and the second conductive polymer layer; wherein:
the intermediate layer comprises a cation agent containing a cationic group, and an anion agent containing a first anionic group and a second anionic group;
the first anionic group is a sulfonate group;
the second anionic group is at least one of species selected from a phosphate group and a phosphonate group; and
in the intermediate layer, a total of a number of the first anionic group and a number of the second anionic group is larger than a number of the cationic group.
2. The electrolytic capacitor according to claim 1 , wherein in the intermediate layer, the number of the second anionic group is larger than the number of the first anionic group.
3. The electrolytic capacitor according to claim 2 , wherein the number of the second anionic group is from 1.5 to 6 times both inclusive the number of the first anionic group.
4. The electrolytic capacitor according to claim 1 , wherein the anion agent comprises a first anion agent containing the first anionic group and a second anion agent containing the second anionic group.
5. The electrolytic capacitor according to claim 1 , wherein the anion agent comprises a third anion agent having the first anionic group and the second anionic group.
6. The electrolytic capacitor according to claim 1 , wherein the cationic group is an amino group.
7. An electrolytic capacitor comprising:
an anode body;
a dielectric layer formed on the anode body;
a first conductive polymer layer covering at least a part of the dielectric layer;
a second conductive polymer layer covering at least a part of the first conductive polymer layer; and
an intermediate layer formed between the first conductive polymer layer and the second conductive polymer layer; wherein:
the intermediate layer comprises a cation agent containing a cationic group, and an anion agent containing a first anionic group and a second anionic group;
the first anionic group is a sulfonate group; and
the second anionic group is at least one of species selected from a phosphate group and a phosphonate group.
8. The electrolytic capacitor according to claim 7 , wherein in the intermediate layer, a number of the second anionic group is larger than a number of the first anionic group.
9. The electrolytic capacitor according to claim 7 , wherein a number of the second anionic group is from 1.5 to 6 times both inclusive a number of the first anionic group.
10. The electrolytic capacitor according to claim 7 , wherein the anion agent comprises a first anion agent containing the first anionic group and a second anion agent containing the second anionic group.
11. The electrolytic capacitor according to claim 7 , wherein the anion agent comprises a third anion agent having the first anionic group and the second anionic group.
12. The electrolytic capacitor according to claim 7 , wherein the cationic group is an amino group.
13. An electrolytic capacitor comprising:
an anode body;
a dielectric layer formed on the anode body; and
a conductive polymer layer covering at least a part of the dielectric layer; wherein:
a cation agent containing a cationic group and an anion agent containing a first anionic group and a second anionic group adhere to the conductive polymer layer;
the first anionic group is a sulfonate group; and
the second anionic group is at least one of species selected from a phosphate group and a phosphonate group.
14. The electrolytic capacitor according to claim 13 , wherein a total of a number of the first anionic group adhering to the conductive polymer layer and a number of the second anionic group adhering to the conductive polymer layer is larger than a number of the cationic group adhering to the conductive polymer layer.
15. The electrolytic capacitor according to claim 13 , wherein a total of a number of the first anionic group and a number of the second anionic group is from 1.1 to 5 times both inclusive a number of the cationic group.
16. The electrolytic capacitor according to claim 13 , wherein a number of the second anionic group adhering to the conductive polymer layer is larger than a number of the first anionic group adhering to the conductive polymer layer.
17. The electrolytic capacitor according to claim 13 , wherein a number of the second anionic group is from 1.5 to 6 times both inclusive a number of the first anionic group.
18. The electrolytic capacitor according to claim 13 , wherein the anion agent comprises a first anion agent containing the first anionic group and a second anion agent containing the second anionic group.
19. The electrolytic capacitor according to claim 13 , wherein the anion agent comprises a third anion agent having the first anionic group and the second anionic group.
20. The electrolytic capacitor according to claim 13 , wherein the cationic group is an amino group.
21. An electrolytic capacitor comprising:
an anode body;
a dielectric layer formed on the anode body; and
a conductive polymer layer covering at least a part of the dielectric layer; wherein:
the conductive polymer layer comprises a cation agent containing a cationic group, and an anion agent containing a first anionic group and a second anionic group;
the first anionic group is a sulfonate group; and
the second anionic group is at least one of species selected from a phosphate group and a phosphonate group.
22. The electrolytic capacitor according to claim 21 , wherein a total of a number of the first anionic group contained in the conductive polymer layer and a number of the second anionic group contained in the conductive polymer layer is larger than a number of the cationic group contained in the conductive polymer layer.
23. The electrolytic capacitor according to claim 21 , wherein a total of a number of the first anionic group and a number of the second anionic group is from 1.1 to 5 times both inclusive a number of the cationic group.
24. The electrolytic capacitor according to claim 21 , wherein a number of the second anionic group contained in the conductive polymer layer is larger than a number of the first anionic group contained in the conductive polymer layer.
25. The electrolytic capacitor according to claim 21 , wherein a number of the second anionic group is from 1.5 to 6 times both inclusive a number of the first anionic group.
26. The electrolytic capacitor according to claim 21 , wherein the anion agent comprises a first anion agent containing the first anionic group and a second anion agent containing the second anionic group.
27. The electrolytic capacitor according to claim 21 , wherein the anion agent comprises a third anion agent having the first anionic group and the second anionic group.
28. The electrolytic capacitor according to claim 21 , wherein the cationic group is an amino group.