In a solid electrolytic capacitor having an electrolyte layer consisting of a solid electrolyte layer and a liquid, the solid electrolytic capacitor, which suppresses a dedoping reaction and which ESR thereof does not keenly increase, in particular, after a loading of heat stress, is provided. In the solid electrolytic capacitor, the electrolyte layer is formed in the capacitor element which is formed by opposing an anode foil and a cathode foil. This electrolyte layer includes the solid electrolyte layer and the liquid. The solid electrolyte layer includes a conductive polymer consisting of a dopant and a conjugated polymer. The liquid is filled in air gaps in the capacitor element on which the solid electrolyte layer is formed. The electrolyte layer includes ammonia as a cation component, and a molecular ratio of the cation component relative to 1 mol of a functional group which can contribute to a doping reaction of the dopant, in the electrolyte layer is 23 or less.

In a solid electrolytic capacitor having an electrolyte layer consisting of a solid electrolyte layer and a liquid, the solid electrolytic capacitor, which suppresses a dedoping reaction and which ESR thereof does not keenly increase, in particular, after a loading of heat stress, is provided. In the solid electrolytic capacitor, the electrolyte layer is formed in the capacitor element which is formed by opposing an anode foil and a cathode foil. This electrolyte layer includes the solid electrolyte layer and the liquid. The solid electrolyte layer includes a conductive polymer consisting of a dopant and a conjugated polymer. The liquid is filled in air gaps in the capacitor element on which the solid electrolyte layer is formed. The electrolyte layer includes ammonia as a cation component, and a molecular ratio of the cation component relative to 1 mol of a functional group which can contribute to a doping reaction of the dopant, in the electrolyte layer is 23 or less.

A capacitor includes a capacitor element that holds a predetermined solution between an anode foil and a cathode foil wound up with a separator in between, a body case that is formed in the shape of a bottomed tube closed at one end with a wall and open at the other end to have an opening, a liquid supply sheet that is arranged between the inner face of the case and the outer face of the element, and a sealing member that seals the opening. The solution has a sealing member deterioration preventing agent dissolved in a lipophilic solvent. The sheet has an absorption portion that makes contact with the separator to absorb the solution and a supply portion that makes contact with the sealing member to supply it with the solution.

A capacitor includes a capacitor element that holds a predetermined solution between an anode foil and a cathode foil wound up with a separator in between, a body case that is formed in the shape of a bottomed tube closed at one end with a wall and open at the other end to have an opening, a liquid supply sheet that is arranged between the inner face of the case and the outer face of the element, and a sealing member that seals the opening. The solution has a sealing member deterioration preventing agent dissolved in a lipophilic solvent. The sheet has an absorption portion that makes contact with the separator to absorb the solution and a supply portion that makes contact with the sealing member to supply it with the solution.

An electrolytic capacitor includes an anode member, a solid electrolyte layer, and a nonaqueous solvent or an electrolyte solution. The anode member includes a dielectric layer. The solid electrolyte layer includes a conductive polymer formed on a surface of the dielectric layer. The nonaqueous solvent or the electrolyte solution includes a first solvent and a second solvent different from the first solvent. The first solvent contains at least one selected from the group consisting of a carbonate ester and a derivative of the carbonate ester.

An electrolytic capacitor includes an anode member, a solid electrolyte layer, and a nonaqueous solvent or an electrolyte solution. The anode member includes a dielectric layer. The solid electrolyte layer includes a conductive polymer formed on a surface of the dielectric layer. The nonaqueous solvent or the electrolyte solution includes a first solvent and a second solvent different from the first solvent. The first solvent contains at least one selected from the group consisting of a carbonate ester and a derivative of the carbonate ester.

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.

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.

Provided is a method for forming a capacitor. The method includes: providing an anode with a dielectric thereon and a conductive node in electrical contact with the anode; applying a conductive seed layer on the dielectric; forming a conductive bridge between the conductive seed layer and the conductive node; applying voltage to the anode; electrochemically polymerizing a monomer thereby forming an electrically conducting polymer of monomer on the conductive seed layer; and disrupting the conductive bridge between the conductive seed layer and the conductive node.

Provided is a method for forming a capacitor. The method includes: providing an anode with a dielectric thereon and a conductive node in electrical contact with the anode; applying a conductive seed layer on the dielectric; forming a conductive bridge between the conductive seed layer and the conductive node; applying voltage to the anode; electrochemically polymerizing a monomer thereby forming an electrically conducting polymer of monomer on the conductive seed layer; and disrupting the conductive bridge between the conductive seed layer and the conductive node.