Electrolytic capacitor and method for manufacturing same
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, and a second conductive polymer layer covering at least a part of the first conductive polymer layer. The first conductive polymer layer contains a first conductive polymer and a first silane compound. The second conductive polymer layer contains a second conductive polymer and a basic compound. The basic compound may be an amine compound.
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; and
a second conductive polymer layer covering at least a part of the first conductive polymer layer, wherein:
the first conductive polymer layer contains a first conductive polymer and a first silane compound, and
the second conductive polymer layer contains a second conductive polymer and a basic compound.
2. The electrolytic capacitor according to claim 1 , wherein the basic compound is an amine compound.
3. The electrolytic capacitor according to claim 1 , wherein the first silane compound is a silane coupling agent.
4. The electrolytic capacitor according to claim 1 , wherein:
the second conductive polymer layer includes:
one or more first layers containing the basic compound; and
one or more second layers formed on the first layer and containing the second conductive polymer.
5. The electrolytic capacitor according to claim 4 , wherein the second conductive polymer layer is constituted by alternately stacking each of the one or more first layers and each of the one or more second layers.
6. The electrolytic capacitor according to claim 1 , wherein the second conductive polymer layer is denser than the first conductive polymer layer.
7. The electrolytic capacitor according to claim 1 , wherein a thickness of the second conductive polymer layer is greater than a thickness of the first conductive polymer layer.
8. The electrolytic capacitor according to claim 1 , wherein:
the second conductive polymer layer further contains a second silane compound, and
a proportion of the first silane compound in the first conductive polymer layer is higher than a proportion of the second silane compound in the second conductive polymer layer.
9. The electrolytic capacitor according to claim 1 , wherein:
the first conductive polymer layer contains a first dopant,
the second conductive polymer layer contains a second dopant, and
a molecular weight of the first dopant is smaller than a molecular weight of the second dopant.
10. The electrolytic capacitor according to claim 1 , wherein:
the first conductive polymer is obtained by polymerizing a precursor of the first conductive polymer on the dielectric layer, and
the second conductive polymer layer is formed by use of a dispersion liquid or solution containing the second conductive polymer.