An electrolytic capacitor includes a capacitor element. The capacitor element includes an anode body, a dielectric layer disposed on a surface of the anode body, a solid electrolyte layer covering at least a part of the dielectric layer, and a first layer covering at least a part of the solid electrolyte layer. The first layer is in contact with the solid electrolyte layer. The first layer constitutes at least a part of the cathode lead-out layer. An electrode potential P.sub.s of the solid electrolyte layer is higher than an electrode potential P.sub.1 of the first layer.

An electrolytic capacitor includes a capacitor element, a cathode lead terminal, and an exterior body. The cathode lead terminal includes a first cathode lead part facing a first main surface of the capacitor element, a second cathode lead part bent from the first cathode lead part, a third cathode lead part bent from the second cathode lead part, and a fourth cathode lead part bent from the first cathode lead part. The second cathode lead part extends in a direction along a surface intersecting with the first main surface. The third cathode lead part extends to be exposed from the exterior body. The fourth cathode lead part extends along a second main surface of the capacitor element. In the normal direction of the first main surface, a height h of the fourth cathode lead part is less than or equal to a height H from the first cathode lead part to a portion of the third cathode lead part that is not exposed from the exterior body.

An electrolytic capacitor includes a capacitor element, a cathode lead terminal, and an exterior body. The cathode lead terminal includes a first cathode lead part facing a first main surface of the capacitor element, a second cathode lead part bent from the first cathode lead part, a third cathode lead part bent from the second cathode lead part, and a fourth cathode lead part bent from the first cathode lead part. The second cathode lead part extends in a direction along a surface intersecting with the first main surface. The third cathode lead part extends to be exposed from the exterior body. The fourth cathode lead part extends along a second main surface of the capacitor element. In the normal direction of the first main surface, a height h of the fourth cathode lead part is less than or equal to a height H from the first cathode lead part to a portion of the third cathode lead part that is not exposed from the exterior body.

A solid electrolytic capacitor with reduced leakage current is provided. An anode foil dielectric oxide film is formed, a lead terminal which is connected to the anode foil, a capacitor element including the anode foil, is formed in the capacitor element, and a solid electrolyte containing a conductive polymer, and a coating layer for elasticating a conductive polymer forming solution between the anode foil and the lead terminal by forming a solid electrolytic capacitor. Preferably, the coating layer is a solid-state electrolytic capacitor formed at least in the opposite portion of the external leading terminals to the anodal foil.

A solid electrolytic capacitor with reduced leakage current is provided. An anode foil dielectric oxide film is formed, a lead terminal which is connected to the anode foil, a capacitor element including the anode foil, is formed in the capacitor element, and a solid electrolyte containing a conductive polymer, and a coating layer for elasticating a conductive polymer forming solution between the anode foil and the lead terminal by forming a solid electrolytic capacitor. Preferably, the coating layer is a solid-state electrolytic capacitor formed at least in the opposite portion of the external leading terminals to the anodal foil.

A wet tantalum electrolytic capacitor containing a cathode, fluidic working electrolyte, and anode formed from an anodically oxidized sintered porous tantalum pellet is described. The pellet is formed from a pressed tantalum powder. The tantalum powder is formed by reacting a tantalum oxide compound, for example, tantalum pentoxide, with a reducing agent that contains a metal having an oxidation state of 2 or more, for example, magnesium. The resulting tantalum powder is nodular or angular and has a specific charge that ranges from about 9,000 μF*V/g to about 11,000 μF*V/g. Using this powder, wet tantalum electrolytic capacitors have breakdown voltages that ranges from about 340 volts to about 450 volts. This makes the electrolytic capacitors ideal for use in an implantable medical device.

A capacitor and a method for producing a capacitor are disclosed. In an embodiment, the capacitor includes a winding having a cathode foil, an anode foil and separators arranged therebetween, an overlap-free region, wherein the cathode foil does not overlap with the anode foil in the overlap-free region, wherein the overlap-free region adjoins an overlapping region, and wherein the cathode foil overlaps with the anode foil in a lateral direction in the overlapping region, and a cathode contact arranged in the overlap-free region, the cathode contact contacting the cathode foil.

An electrolytic capacitor includes a capacitor element that includes a porous anode body including an anode base body and a dielectric layer formed on a surface of the anode base body, and a solid electrolyte layer that covers at least a part of the dielectric layer. The anode body includes a plurality of principal surfaces, and at least a part of a surface layer of at least one principal surface of the plurality of principal surfaces of the anode body is denser than an inside of the anode body.

A tantalum capacitor includes: first and second surfaces facing in a first direction, third and fourth surfaces facing in a second direction, and fifth and sixth surfaces facing in a third direction; a tantalum body having one surface through which a tantalum wire is exposed in the first direction; and a substrate on which the tantalum body is mounted, wherein the substrate may be an organic-inorganic composite substrate.

A tantalum capacitor includes: first and second surfaces facing in a first direction, third and fourth surfaces facing in a second direction, and fifth and sixth surfaces facing in a third direction; a tantalum body having one surface through which a tantalum wire is exposed in the first direction; and a substrate on which the tantalum body is mounted, wherein the substrate may be an organic-inorganic composite substrate.