Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Matsushita Electric Industrial

Chiharu Hayashi

Emiko Igaki

Masakazu Tanahashi

Kenji Akami

Kazuyuki Okano

Yo Hasegawa

Yasunobu Tsuji

Hiroshi Shimada

Yasuhito Isozaki

Yasuo Kudoh

Toshikuni Kojima

Seiji Takagi

Ayumi Kochi

Munehiro Tabata

Yasue Matsuya

Yoshiki Hashimoto

Takahiro Hamada

Tatsuo Ogawa

Akira Nakanishi

Kazuo Kawahito

Tomoko Kawashima

Hisataka Kato

Mitsuo Terada

Yoshihiko Tsujikawa

A solid electrolytic capacitor employing a conductive polymer has a solid electrolyte layer with a laminated structure where a second conductive polymer layer complexed with an ionic polymer is stacked on a first conductive polymer layer composed of polyaniline or a derivative thereof. By achieving a solid electrolyte layer having an excellent self-healing property, a solid electrolytic capacitor having an excellent withstand voltage characteristic can be provided.

Solid electrolytic capacitor and method for manufacturing same

A conducting polymer composite is made by compounding a conducting polymer and an ionic polymer so as to achieve good conductivity. A high resistance material generated also has a high withstand voltage. A solid electrolytic capacitor using this conducting polymer composite as its solid electrolytic layer achieves low ESR and high withstand voltage.

Conducting polymer composite and solid electrolytic capacitor using the same

A solid electrolytic capacitor includes an anode element made of a valve action metal, a dielectric oxide film formed on a surface of the anode element, a solid electrolytic layer formed on a surface of the dielectric oxide film, and a cathode layer formed on a surface of the solid electrolytic layer. The solid electrolytic layer has an iron concentration not greater than 100 ppm. Alternatively or in combination therewith, a weight fraction of residues in the solid electrolytic layer is smaller than 5 wt %. The polymerization residue is an oxidizing agent and a monomer that is produced when such solid electrolytic layer is formed.

Solid electrolytic capacitor

Disclosed is a method of making an electrolytic capacitor including the steps of forming a cathode by depositing a homogeneous and densified conducting polymer on a dielectric layer of a valvular metal porous anode. The conducting polymer is formed of two layers by chemical oxidation polymerization. The first conductive polymer layer is formed in the pretreatment step using a solution excluding an organic acid-type dopant, the polymer is efficiently formed on the inner surface of the pores of the anode and the second conductive polymer layer is formed in the primary treatment step on the first conductive polymer layer, using a solution containing an organic acid-type dopant. The resultant capacitor obtains a high capacitance, a low impedance, and a high responsiveness at high frequencies.

Method of making an electrolytic capacitor having a conductive polymer formed on the inner surface of micropores of the anodes

A solid electrolytic capacitor includes a capacitor element having an anode of a valve action metal, an oxide film layer formed on the surface of the anode, a solid electrolytic layer formed on the oxide film layer and a cathode electrically connected to the solid electrolytic layer, and also a packaging resin formed to cover the capacitor element. An intermediate layer to relieve stress is arranged in at least one part of the interface between the cathode and the packaging resin. The intermediate layer is deformed and/or peels to relieve stress caused by heat applied while mounting the capacitor element on a substrate.

The present invention provides a method of producing an electrolytic capacitor including a porous anode and a solid electrolyte made of a conductive polymer, which can improve coating properties of the conductive polymer on an external surface of the porous anode and productivity. By controlling a polymerization rate, it is possible to sufficiently coat the external surface of the porous anode and fill inner spaces of a lot of pores of the porous anode with the conductive polymer with less numbers of polymerization in comparison with a method of the prior art, thereby obtaining an electrolytic capacitor with small leak current and high reliability.

Method of producing electrolytic capacitor

A solid electrolytic capacitor comprising comprises a pair of electrodes, and a dielectric film provided between the paired electrodes wherein at least one of the paired electrodes comprising a first conductive polymer layer which is made of a polymer of a member selected from the group consisting of pyrrole and derivatives thereof, the first conductive polymer layer being doped with a mixed dopant of a polyvalent anion and a monovalent anion consisting of a sulfonate ion dissociated from an anionic surface active agent. The conductive polymer layer may have a double-layered or a multi-layered structure wherein a second and/or third conductive polymer layer is made of a doped polymer of a thiophene derivative. A method for making the capacitors are also described.

Solid electrolytic capacitors comprising a conductive layer made of a polymer of pyrrole or its derivative and method for making the same

An electrolytic capacitor in which an conducting polymer as a cathode of the electrolytic capacitor is formed as a homogeneous and densified film on the dielectric layer even extending to the inside of pores of a valvular metal porous body and which obtains a high rate of inducing the capacitance, and have low impedance and high responsiveness at high frequencies. A chemical oxidation polymerization method is utilized to form an conducting polymer layer even extending to the inside of pores of the capacitor element. First, a polymerization reaction is performed in a solution excluding an organic acid-type dopant to form an conducting polymer layer as a densified film on a dielectric layer extending from the surface of the porous body to every inside portions of pores in the pretreatment. Then a polymerization reaction is performed in a solution containing an organic acid-type dopant to grow an conducting polymer layer containing an organic acid-type dopant over the conducting polymer layer without including an organic acid-type dopant in the primary treatment.

Electrolytic capacitor having a conducting polymer layer without

The present invention provides a method for producing an electrolytic capacitor including a porous body of a valve metal, an oxide film on a surface of the valve metal, and a conductive polymer layer on a surface of the oxide film. The step of forming the conductive polymer layer on the surface of the oxide film includes the steps of dipping the porous body in a monomer solution; lifting the porous body from the monomer solution and dipping the porous body in an oxidizing solution; and lifting the porous body from the oxidizing solution and allowing the porous body to stand. In the step of dipping the porous body in the oxidizing solution, a period for which the porous body is dipped in the oxidizing solution is equal to or shorter than a period in which 30% of the monomer contained in pores of the porous body diffuses and flows into the oxidizing solution. Alternatively, the volume of the oxidizing solution can be less than three times that of the porous body. The above method can be performed by replacing the monomer solution and the oxidizing solution with each other. Furthermore, a temperature of the porous body is maintained at a low temperature (e.g., 10.degree. C. or less) in the step of dipping the porous body in the oxidizing solution.

Electrolytic capacitor and method for producing the same

A solid electrolytic capacitor is composed of a pair of electrodes and a dielectric film therebetween, wherein one electrode includes a conducting polymer doped with a polyvalent anion and a monovalent anion. The conducting polymer layer may have a multi-layer structure wherein a second or third conductive polymer layer is made of doped thiophene or derivative thereof.

Solid electrolytic capacitors comprising a conductive layer made of a

A capacitor which includes a dielectric layer, a metal electrode and a capacity adjusting electrode erodable by exposure to light energy, the capacity adjusting electrode being a film made of at least one selected from metallic oxides, metallic nitride and metallic boride.

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Hirakata, Japan

Chiharu Hayashi