An object of the present invention is to provide a solid electrolyte which exhibits good ionic conductivity in a room temperature state and is excellent in moldability, productivity, and quality stability, an electrode, a battery and a capacitor using the solid electrolyte, and a method of producing the solid electrolyte. The present invention is a solid electrolyte containing an alkali metal salt and a polymer, wherein the polymer has, for example, a monomer unit of a chemical formula (1).

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An object of the present invention is to provide a solid electrolyte which exhibits good ionic conductivity in a room temperature state and is excellent in moldability, productivity, and quality stability, an electrode, a battery and a capacitor using the solid electrolyte, and a method of producing the solid electrolyte. The present invention is a solid electrolyte containing an alkali metal salt and a polymer, wherein the polymer has, for example, a monomer unit of a chemical formula (1).

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An electrolytic capacitor includes a capacitor element and a liquid component. The capacitor element includes an anode body that includes a dielectric layer on a surface of the anode body and a conductive polymer that covers a part of the dielectric layer. The liquid component includes a sugar alcohol component and a polyalkylene glycol component. The sugar alcohol component contains at least one selected from the group consisting of a sugar alcohol having four or more hydroxy groups and a derivative of the sugar alcohol.

An electrolytic capacitor includes a capacitor element. The capacitor element includes a separator, an anode body and a cathode body each having a foil shape and facing each other with the separator disposed between the anode body and the cathode body, and an electrolyte layer being in contact with the anode body, the cathode body, and the separator. The electrolyte layer contains a first conductive polymer and a first compound having a melting point of 50° C. or higher. The first compound is at least one compound selected from the group consisting of a sugar and a polyhydric alcohol. The first compound is unevenly distributed in the electrolyte layer.

An electrolytic capacitor includes a capacitor element. The capacitor element includes a separator, an anode body and a cathode body each having a foil shape and facing each other with the separator disposed between the anode body and the cathode body, and an electrolyte layer being in contact with the anode body, the cathode body, and the separator. The electrolyte layer contains a first conductive polymer and a first compound having a melting point of 50° C. or higher. The first compound is at least one compound selected from the group consisting of a sugar and a polyhydric alcohol. The first compound is unevenly distributed in the electrolyte layer.

A solid electrolytic capacitor according to an aspect includes an anode body made of a valve metal, a dielectric layer formed on the anode body, a solid electrolyte layer formed on the dielectric layer, and a cathode body layer formed on the solid electrolyte layer. The solid electrolyte layer includes a first layer containing a first conductive polymer doped with a monomolecular dopant, and a second conductive polymer composed of a self-doped-type conductive polymer containing a plurality of side chains containing a functional group, the functional group being able to be doped, and a second layer formed on the first layer and containing a third conductive polymer doped with a polymer dopant; and the first conductive polymer is in contact with the third conductive polymer (the second layer).

A solid electrolytic capacitor according to an aspect includes an anode body made of a valve metal, a dielectric layer formed on the anode body, a solid electrolyte layer formed on the dielectric layer, and a cathode body layer formed on the solid electrolyte layer. The solid electrolyte layer includes a first layer containing a first conductive polymer doped with a monomolecular dopant, and a second conductive polymer composed of a self-doped-type conductive polymer containing a plurality of side chains containing a functional group, the functional group being able to be doped, and a second layer formed on the first layer and containing a third conductive polymer doped with a polymer dopant; and the first conductive polymer is in contact with the third conductive polymer (the second layer).

Disclosed is an electrolytic capacitor including a capacitor element. The capacitor element includes an anode body having a dielectric layer formed at a surface of the anode body, and an electrolyte layer disposed adjacent to the dielectric layer. The electrolyte layer contains a conductive polymer doped with a dopant, conductive particles, and a non-aqueous solvent.

Disclosed is an electrolytic capacitor including a capacitor element. The capacitor element includes an anode body having a dielectric layer formed at a surface of the anode body, and an electrolyte layer disposed adjacent to the dielectric layer. The electrolyte layer contains a conductive polymer doped with a dopant, conductive particles, and a non-aqueous solvent.

A 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 cathode lead-out layer covering at least a part of the solid electrolyte layer. An insulating member is disposed from an outermost surface of the cathode lead-out layer to a depth of more than or equal to 0.001 μm.