Solid electrolytic capacitor and method for producing the same
First Claim
1. A solid electrolytic capacitor comprising a capacitor element obtainable by compressing a porous valve-acting metal substrate having on the dielectric film surface thereof a solid electrolyte layer containing an electrically conducting polymer in the thickness direction and re-electrochemical formation after the compressing step.
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Accused Products
Abstract
A solid electrolytic capacitor comprising a capacitor element obtainable by compressing a porous valve-acting metal substrate having on the dielectric film surface thereof a solid electrolyte layer containing an electrically conducting polymer in the thickness direction, wherein assuming that the maximum thickness and the minimum thickness of the electrically conducting polymer layer including the substrate before the compression are Hamax and Hamin, and the maximum thickness and the minimum thickness of the electrically conducting polymer layer after the compression are Hbmax and Hbmin, the percentage decrease ΔH in the difference of thickness represented by the following formula is preferably from 5 to 95%: Formula (I). The thin solid electrolytic capacitor element of the present invention, which can be stably produced with a small variety in shape, enables fabrication of a solid electrolytic multilayer capacitor having a high-capacitance and small-size with a low height, which, free from short-circuit failure, exhibits stable performance
50 Citations
25 Claims
- 1. A solid electrolytic capacitor comprising a capacitor element obtainable by compressing a porous valve-acting metal substrate having on the dielectric film surface thereof a solid electrolyte layer containing an electrically conducting polymer in the thickness direction and re-electrochemical formation after the compressing step.
- 17. A solid electrolytic multilayer capacitor comprising a capacitor element obtained by stacking a plurality of porous valve-acting metal substrates each having on the dielectric film surface thereof a solid electrolyte layer comprising an electrically conducting polymer resulting from oxidative polymerization of a monomer of an organic polymer with an oxidizing agent, compressing the multilayer substrate in the thickness direction, providing a cathode layer on the outer surface of the solid electrolyte layer, and re-electrochemical formation after the compressing step.
- 19. A method for producing a solid electrolytic capacitor, comprising forming a solid electrolyte layer of an electrically conducting polymer on the surface of a porous valve-acting metal substrate having a dielectric film by using a solution containing a monomer for forming an electrically conducting polymer under the action of an oxidizing agent and a solution containing an oxidizing agent, compressing the substrate having provided thereon an electrically conducting polymer in the thickness direction and providing a cathode layer on the solid electrolyte layer, further comprising a re-electrochemical formation step after the step of compressing the substrate having provided thereon a solid electrolyte layer in the thickness direction.
- 22. The method for producing a solid electrolytic capacitor as claimed in chain 19, which comprises a humidification aging step after the step of compressing the substrate having provided thereon a solid electrolyte layer in the thickness direction.
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24. A method for producing a solid electrolytic capacitor, comprising forming a solid electrolyte layer of an electrically conducting polymer on the surface of a porous valve-acting metal substrate having a dielectric film by using a solution containing a monomer for forming an electrically conducting polymer under the action of an oxidizing agent and a solution containing an oxidizing agent, stacking a plurality of substrates each having provided thereon an electrically conducting polymer, compressing the multilayer substrate in the thickness direction and providing a cathode layer on the outer surface of the solid electrolyte layer, further comprising a re-electrochemical formation step after the step of compressing the substrate having provided thereon a solid electrolyte layer in the thickness direction.
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25. A method for producing a solid electrolytic capacitor, comprising forming a solid electrolyte layer of an electrically conducting polymer on the surface of a porous valve-acting metal substrate having a dielectric film by using a solution containing a monomer for forming an electrically conducting polymer under the action of an oxidizing agent and a solution containing an oxidizing agent, compressing the substrate having provided thereon an electrically conducting polymer in the thickness direction, providing a cathode layer on the solid electrolyte layer, and compressing the cathode layer in the thickness direction, further comprising a re-electrochemical formation step after the step of compressing the substrate having provided thereon a solid electrolyte layer in the thickness direction.
Specification