Patents by Inventor Hitoshi Yokouchi
Hitoshi Yokouchi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11018344Abstract: A current collector for electrical storage device includes a sheet-shaped conductive substrate and a coating layer disposed on one or both sides of the conductive substrate. The coating layer includes a powdery carbon material, acid-modified polyvinylidene fluoride and polyvinylpyrrolidone. The content of the polyvinylpyrrolidone is 0.099 to 5.0 mass %. The content of the powdery carbon material in the coating layer is 15.0 to 45.0 mass %. Also disclosed is a coating liquid for producing the current collector for electrical storage device as well as a method for producing the current collector for electrical storage device.Type: GrantFiled: September 10, 2018Date of Patent: May 25, 2021Assignee: SHOWA DENKO K.K.Inventors: Akifumi Takeda, Takeshi Nakamura, Hitoshi Yokouchi
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Publication number: 20200403246Abstract: A current collector for electrical storage device includes a sheet-shaped conductive substrate and a coating layer disposed on one or both sides of the conductive substrate. The coating layer includes a powdery carbon material, acid-modified polyvinylidene fluoride and polyvinylpyrrolidone. The content of the polyvinylpyrrolidone is 0.099 to 5.0 mass %. The content of the powdery carbon material in the coating layer is 15.0 to 45.0 mass %. Also disclosed is a coating liquid for producing the current collector for electrical storage device as well as a method for producing the current collector for electrical storage device.Type: ApplicationFiled: September 10, 2018Publication date: December 24, 2020Applicant: SHOWA DENKO K.K.Inventors: Akifumi TAKEDA, Takeshi NAKAMURA, Hitoshi YOKOUCHI
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Publication number: 20170331115Abstract: An electrode current collector including a metal foil wherein a coating layer is formed on one or both surfaces of the metal foil, and a contact angle with pure water of the surface of the coating layer at a side opposite to the metal foil side is 30° or more.Type: ApplicationFiled: October 27, 2015Publication date: November 16, 2017Applicant: SHOWA DENKO K.K.Inventors: Shunsuke SAITO, Akifumi TAKEDA, Hitoshi YOKOUCHI
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Patent number: 9774029Abstract: In this anode for a secondary battery, method for producing same, and secondary battery, an anode active material is laminated on a surface of a metal foil, the anode active material contains at least titanium dioxide, and the titanium dioxide contains a Brookite crystal phase and contains an amorphous phase in a ratio of 1 vol % to 20 vol %.Type: GrantFiled: April 22, 2013Date of Patent: September 26, 2017Assignee: SHOWA DENKO K.K.Inventors: Hitoshi Yokouchi, Masahiro Ohmori, Chiaki Sotowa, Masayuki Sanbayashi
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Patent number: 9515316Abstract: This method for producing an anode active material for a secondary battery is provided with a step for forming titanium dioxide by means of hydrolysis by adding a titanium-containing compound to an acidic aqueous solution, and furthermore, by means of adding a compound containing an alkaline earth metal and a condensed phosphate, the surface of the titanium dioxide is covered by the condensed phosphate containing the alkaline earth metal in a manner so that the amount of elemental phosphorus atoms and the amount of alkaline earth metal are each in the range of 0.1 to 10 mass % with respect to the mass of titanium dioxide, thus synthesizing the anode active material (12).Type: GrantFiled: April 22, 2013Date of Patent: December 6, 2016Assignee: SHOWA DENKO K.K.Inventors: Hitoshi Yokouchi, Masahiro Ohmori, Chiaki Sotowa, Masayuki Sanbayashi
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Patent number: 9478366Abstract: An electricity storage device including at least one electrode having one metal tab lead and plural electrode plates. The electrode plate includes a metal foil, an undercoat layer formed on one surface or both surfaces of the metal foil, and an active material layer formed on a surface of the undercoat layer. The undercoat layer includes a carbon material and the undercoat layer has a coating weight per unit area of one surface of 0.01 to 3 g/m2. A sum total thickness of the metal foils in the electrode plates is 0.2 to 2 mm. The electrode plates are welded to each other in a portion where the undercoat layer is formed and no active material layer is formed. Further, at least one of the electrode plates is welded to the metal tab lead in a portion where the undercoat layer is formed and no active material layer is formed.Type: GrantFiled: August 29, 2013Date of Patent: October 25, 2016Assignee: SHOWA DENKA K.K.Inventors: Hitoshi Yokouchi, Masahiro Ohmori, Masatoshi Kunisawa
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Publication number: 20150287983Abstract: This method for producing an anode active material for a secondary battery is provided with a step for forming titanium dioxide by means of hydrolysis by adding a titanium-containing compound to an acidic aqueous solution, and furthermore, by means of adding a compound containing an alkaline earth metal and a condensed phosphate, the surface of the titanium dioxide is covered by the condensed phosphate containing the alkaline earth metal in a manner so that the amount of elemental phosphorus atoms and the amount of alkaline earth metal are each in the range of 0.1 to 10 mass % with respect to the mass of titanium dioxide, thus synthesizing the anode active material (12).Type: ApplicationFiled: April 22, 2013Publication date: October 8, 2015Applicant: SHOWA DENKO K.K.Inventors: Hitoshi Yokouchi, Masahiro Ohmori, Chiaki Sotowa, Masayuki Sanbayashi
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Publication number: 20150255788Abstract: An object of the present invention is to provide a secondary battery capable of rapid charging and discharging at a high current, in which, even when a titanium-containing oxide is used as a negative electrode active material, the internal resistance and impedance of the secondary battery are low without adding a material, which does not contribute to electrical capacity, such as a conductive assistant to a negative electrode active material layer in a large amount. Provided is a negative electrode for a secondary battery including: metal foil; and a negative electrode active material layer that is formed on a single surface or both surfaces of the metal foil and includes a titanium-containing oxide as a negative electrode active material, in which a film containing a conductive material is formed between the metal foil and the negative electrode active material layer.Type: ApplicationFiled: September 26, 2012Publication date: September 10, 2015Applicant: SHOWA DENKO K.K.Inventors: Hitoshi Yokouchi, Masahiro Ohmori, Masatoshi Kunisawa
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Publication number: 20150213967Abstract: An electricity storage device including at least one electrode having one metal tab lead and plural electrode plates. The electrode plate includes a metal foil, an undercoat layer formed on one surface or both surfaces of the metal foil, and an active material layer formed on a surface of the undercoat layer. The undercoat layer includes a carbon material and the undercoat layer has a coating weight per unit area of one surface of 0.01 to 3 g/m2. A sum total thickness of the metal foils in the electrode plates is 0.2 to 2 mm. The electrode plates are welded to each other in a portion where the undercoat layer is formed and no active material layer is formed. Further, at least one of the electrode plates is welded to the metal tab lead in a portion where the undercoat layer is formed and no active material layer is formed.Type: ApplicationFiled: August 29, 2013Publication date: July 30, 2015Applicant: SHOWA DENKO K.K.Inventors: Hitoshi Yokouchi, Masahiro Ohmori, Masatoshi Kunisawa
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Publication number: 20150093649Abstract: An object of the present invention is to provide a method of producing a current collector for an electrochemical element that enable rapid charging and discharging with low internal resistance. The method of producing a current collector for an electrochemical element in the present invention has a step for coating a coating liquid onto a metal foil, the coating liquid containing at least one substance selected from the group consisting of methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxyethyl methyl cellulose, hydroxyethyl ethyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl starch, hydroxypropyl starch, dextrin, pullulan, dextran, guar gum and hydroxypropyl guar gum; an organic acid having valence of two or more or a derivative thereof, carbon particles and an organic solvent, followed by removing the organic solvent and forming a coating layer on the metal foil.Type: ApplicationFiled: March 15, 2013Publication date: April 2, 2015Inventors: Yoshikazu Arai, Nobuyuki Kobayashi, Seiji Doi, Hitoshi Yokouchi, Masahiro Ohmori
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Publication number: 20150086850Abstract: In this anode for a secondary battery, method for producing same, and secondary battery, an anode active material is laminated on a surface of a metal foil, the anode active material contains at least titanium dioxide, and the titanium dioxide contains a Brookite crystal phase and contains an amorphous phase in a ratio of 1 vol % to 20 vol %.Type: ApplicationFiled: April 22, 2013Publication date: March 26, 2015Applicant: SHOWA DENKO K.K.Inventors: Hitoshi Yokouchi, Masahiro Ohmori, Chiaki Sotowa, Masayuki Sanbayashi
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Patent number: 8802187Abstract: The present invention provides a method of manufacturing a solar cell, comprising forming a buffer layer comprising a group-III nitride semiconductor on a substrate using a sputtering method, and forming a group-III nitride semiconductor layer and electrodes on the buffer layer. The group-III nitride semiconductor layer is formed on the buffer layer by at least one selected from the group consisting of the sputtering method, a MOCVD method, an MBE method, a CBE method, and an MLE method, and the electrodes are formed on the group-III nitride semiconductor layer.Type: GrantFiled: June 22, 2010Date of Patent: August 12, 2014Assignee: Showa Denko K.K.Inventors: Yoshiaki Ikenoue, Hisayuki Miki, Kenzo Hanawa, Yasumasa Sasaki, Hitoshi Yokouchi, Ryoko Konta, Hiroaki Kaji
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Publication number: 20140065491Abstract: A secondary battery which includes a positive electrode and a negative electrode, wherein the negative electrode has a negative electrode collector and a negative electrode active material layer, and the negative electrode collector has a base material which is formed of aluminum foil and an resin film which has a thickness of 0.01 to 5 ?m and does not allow a nonaqueous electrolyte to permeate therethrough.Type: ApplicationFiled: April 25, 2012Publication date: March 6, 2014Applicant: SHOWA DENKO K.K.Inventors: Hitoshi Yokouchi, Masahiro Ohmori, Masatoshi Kunisawa
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Publication number: 20130323589Abstract: A current collector for an electrochemical element including an aluminum foil showing a peak in the range between 945 cm?1 and 962 cm?1 in measurement of a surface layer of the aluminum foil by Fourier transform infrared spectroscopy. The current collector can be obtained by a manufacturing method which includes the steps of: preparing an aluminum foil material; washing a surface of the aluminum foil material with a chemical solution capable of dissolving aluminum such as hydrochloric acid, aqueous nitric acid, aqueous sulfuric acid, aqueous solutions of alkali metal hydroxides and aqueous solutions of alkaline earth metal hydroxides; and optionally heat treating the aluminum foil at 70 to 200° C. and/or forming a coated layer including an electrically conducive material, on one or both surfaces of the aluminum foil.Type: ApplicationFiled: February 10, 2012Publication date: December 5, 2013Applicant: SHOWA DENKO K.K.Inventors: Tomofumi Yamaguchi, Masahiro Ohmori, Hitoshi Yokouchi
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Publication number: 20130295458Abstract: A current collector wherein Layer a comprising electrically conductive particles such as electrically conductive carbon; a binding agent such as chitosan, chitin and the like; and organic acid such as trimellitic anhydride, pyromellitic anhydride, 1,2,3,4-butanetetracarboxylic acid and the like is provided on one or both surfaces of a metal foil such as an aluminum foil, a copper foil and the like, and the coverage of the electrically conductive particles is 50 to 100%, and the thickness of the Layer a is 5 ?m or less. An electrode wherein Layer b comprising an electrode active material is provided on a surface having the Layer a of the current collector. An electrochemical element comprising the electrode.Type: ApplicationFiled: January 13, 2012Publication date: November 7, 2013Applicant: SHOWA DENKO K.K.Inventors: Hitoshi Yokouchi, Masahiro Ohmori, Akifumi Takeda
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Publication number: 20130251997Abstract: A process for producing a single crystal barium titanate including reacting a titanium oxide sol obtained by a wet process and a water-soluble barium compound under the presence of a basic compound in an aqueous reaction mixture at a pH of at least 11 to form a slurry containing barium titanate. The aqueous reaction mixture is subjected to a solid-liquid separation to separate the barium titanate from the slurry. The basic compound is removed as a gas from the barium titanate, and the barium titanate is fired at 300-1200° C.Type: ApplicationFiled: May 16, 2013Publication date: September 26, 2013Applicant: SHOWA DENKO K.K.Inventors: Akihiko SHIRAKAWA, Hitoshi YOKOUCHI
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Publication number: 20130196230Abstract: A coating solution comprising (A) water or a mixed solvent of water and an organic solvent, (B) an electrical conducting material, and (C) at least one selected from the group consisting of polysaccharides and polysaccharide derivatives as essential components, and (D) at least one selected from the group consisting of a polybasic organic acid and a polybasic organic acid derivative as an optional component, wherein mass WB of the component (B), mass WC of the component (C) and mass WD of the component (D) satisfy a relationship of 0.5?WB/(WC+WD)?5. An electric collector comprising an electrically-conductive substrate, and an undercoat layer formed on one or both surfaces of the electrically-conductive substrate, wherein the undercoat layer is formed by applying a coating solution comprising (A) water or a mixed solvent of water and an organic solvent, and (B) an electrical conducting material, and the electric collector is 100 milliohm or less in a penetration resistance value measured at 25 deg C.Type: ApplicationFiled: September 2, 2011Publication date: August 1, 2013Applicant: SHOWA DENKO K.K.Inventors: Hitoshi Yokouchi, Masahiro Ohmori, Akifumi Takeda
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Publication number: 20100261308Abstract: The present invention provides a method of manufacturing a solar cell, comprising forming a buffer layer comprising a group-III nitride semiconductor on a substrate using a sputtering method, and forming a group-III nitride semiconductor layer and electrodes on the buffer layer. The group-III nitride semiconductor layer is formed on the buffer layer by at least one selected from the group consisting of the sputtering method, a MOCVD method, an MBE method, a CBE method, and an MLE method, and the electrodes are formed on the group-III nitride semiconductor layer.Type: ApplicationFiled: June 22, 2010Publication date: October 14, 2010Applicant: SHOWA DENKO K.K.Inventors: Yoshiaki IKENOUE, Hisayuki Miki, Kenzo Hanawa, Yasumasa Sasaki, Hitoshi Yokouchi, Ryoko Konta, Hiroaki Kaji
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Publication number: 20090285748Abstract: A process for producing a single crystal barium titanate comprises reacting a titanium oxide sol obtained by a wet process and a water-soluble barium compound under the presence of a basic compound in an aqueous reaction mixture at a pH of at least 11 to form a slurry containing barium titanate. The aqueous reaction mixture is subjected to a solid-liquid separation to separate the barium titanate from the slurry. The basic compound is removed as a gas from the barium titanate, and the barium titanate is fired at 300-1200° C.Type: ApplicationFiled: July 27, 2009Publication date: November 19, 2009Applicant: SHOWA DENKO K.K.Inventors: Akihiko Shirakawa, Hitoshi Yokouchi
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Publication number: 20090205707Abstract: The object of the present invention is to provide a solar cell which is industrially beneficial and has high light conversion efficiency; and a method for producing a solar cell; and the present invention provides a solar cell comprising a substrate, a power generation layer for converting received light into electrical power, a translucent electrode, and another electrode, when light travels through each member from a first surface thereof, a surface opposite to the first surface is defined as a second surface, the power generation layer is formed at a second surface side of the substrate, the translucent electrode is formed on one surface of the power generation layer, and another electrode is formed on the other surface of the power generation layer, wherein the translucent electrode comprises hexagonal In2O3 crystal.Type: ApplicationFiled: February 18, 2009Publication date: August 20, 2009Applicant: SHOWA DENKO K.K.Inventors: Yoshiaki IKENOUE, Naoki Fukunaga, Hironao Shinohara, Hisayuki Miki, Kenzo Hanawa, Hiroaki Kaji, Hitoshi Yokouchi, Ryoko Konta