Solid-state electrolytic capacitor element and solid-state electrolytic capacitor
View Patent ↗A solid electrolytic capacitor includes a solid electrolytic capacitor element and an exterior body that seals the solid electrolytic capacitor element. The solid electrolytic capacitor element includes an anode body including a first end part and a second end part that is disposed opposite to the first end part, a dielectric layer covering at least a part of the anode body, and a cathode part covering at least a part of the dielectric layer. The at least a part of the dielectric layer is disposed on a portion of the anode body that is closer to the second end part than to the first end part. The cathode part includes a solid electrolyte layer covering the at least a part of the dielectric layer. A breaking strength of the solid electrolyte layer is 0.55 MPa or more and 45.00 MPa or less.
1 . A solid electrolytic capacitor element comprising:
an anode body including a first end part and a second end part, the second end part being disposed opposite to the first end part;
a dielectric layer covering at least a part of the anode body; and
a cathode part covering at least a part of the dielectric layer, the at least a part of the dielectric layer being disposed on a portion of the anode body that is closer to the second end part than to the first end part, wherein:
the cathode part includes a solid electrolyte layer covering the at least a part of the dielectric layer,
the solid electrolyte layer contains a conjugated polymer, a dopant, and a water-soluble polymer, and
a breaking strength of the solid electrolyte layer is 0.55 MPa or more and 2.00 MPa or less, the breaking strength being measured by a nanoindentation method.
2 . The solid electrolytic capacitor element according to claim 1 , wherein a thickness of the solid electrolyte layer has a minimum value of 1 μm or more.
3 . The solid electrolytic capacitor element according to claim 1 , wherein a ratio t n /t c of t n to t c is 0.5 or more and 1.8 or less, where t n represents an average value of thicknesses of the solid electrolyte layer in the second end part, and t c represents an average value of thicknesses of the solid electrolyte layer in a center part of the solid electrolyte layer that is located at a center in a direction parallel to a direction from the first end part toward the second end part.
4 . A solid electrolytic capacitor comprising:
at least one solid electrolytic capacitor element according to claim 1 ; and
an exterior body that seals the solid electrolytic capacitor element.
5 . The solid electrolytic capacitor according to claim 4 , wherein the exterior body contains a resin.
6 . The solid electrolytic capacitor according to claim 4 , comprising a stacked body of two or more solid electrolytic capacitor elements including the solid electrolytic capacitor element.