Electrolytic capacitor and method for manufacturing same
An electrolytic capacitor includes an anode body including a dielectric layer, a cathode body, and a conductive polymer layer and a liquid component that are disposed between the anode body and the cathode body. The cathode body includes a base material part having an outer surface that is roughened surface and has a pore opened at the outer surface, and an inorganic conductive layer covering at least a part of the outer surface. The base material part includes a first coating layer disposed along at least a part of inner wall of the pore. The first coating layer contains phosphorus.
1. An electrolytic capacitor comprising:
an anode body including a dielectric layer;
a cathode body; and
a conductive polymer layer and a liquid component that are disposed between the anode body and the cathode body, wherein:
the cathode body includes:
a base material part having an outer surface that is roughened surface and has a pore opened at the outer surface; and
an inorganic conductive layer covering at least a part of the outer surface,
the base material part includes a first coating layer disposed along at least a part of the inner wall of the pore,
the first coating layer contains phosphorus,
a second coating layer is disposed along the outer surface of the base material part,
the inorganic conductive layer covers at least a part of the second coating layer,
the first coating layer has a film thickness greater than a film thickness of the second coating layer,
the second coating layer contains phosphorus, and
the first coating layer has a phosphorus concentration higher than a phosphorus concentration of the second coating layer.
2. The electrolytic capacitor according to claim 1 , wherein:
the first coating layer contains an oxide of a first metal, and phosphorus, and
the second coating layer contains an oxide of the first metal.
3. The electrolytic capacitor according to claim 1 , wherein the inorganic conductive layer has a phosphorus-attached region on an outer surface of the inorganic conductive layer.
4. The electrolytic capacitor according to claim 1 , wherein the inorganic conductive layer contains conductive carbon.
5. An electrolytic capacitor comprising:
an anode body including a dielectric layer;
a cathode body; and
a conductive polymer layer and a liquid component that are disposed between the anode body and the cathode body, wherein:
the cathode body includes:
a base material part having an outer surface that is roughened surface and has a pore opened at the outer surface; and
an inorganic conductive layer covering at least a part of the outer surface,
the base material part includes a first coating layer disposed along at least a part of inner wall of the pore,
the first coating layer contains phosphorus,
a second coating layer is disposed along the outer surface of the base material part,
the inorganic conductive layer covers at least a part of the second coating layer, and
the first coating layer has a film thickness greater than a film thickness of the second coating ager,
the first coating layer contains an oxide of a first metal, and phosphorus, and
the second coating layer contains an oxide of the first metal.
6. The electrolytic capacitor according to claim 5 , wherein the inorganic conductive layer has a phosphorus-attached region on an outer surface of the inorganic conductive layer.
7. The electrolytic capacitor according to claim 5 , wherein the inorganic conductive layer contains conductive carbon.