Patents by Inventor Yu Ohtsuka
Yu Ohtsuka 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: 10050274Abstract: A power storage device of the present invention includes a positive electrode, a negative electrode, and an electrolyte. At least one of the positive electrode and the negative electrode includes an organic compound as an active material having a portion contributing to an oxidation-reduction reaction. The organic compound is crystalline in both a charged state and a discharged state.Type: GrantFiled: May 11, 2007Date of Patent: August 14, 2018Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Nobuhiko Hojo, Yu Ohtsuka, Taisuke Yamamoto
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Patent number: 9650392Abstract: Disclosed are an electrode active material for a power storage device and a power storage device including the same. The electrode active material includes a polymer that includes: a tetravalent group derived from a compound selected from the group consisting of EBDT and derivatives thereof, TTF and derivatives thereof, a condensation product of EBDT and TTF and derivatives thereof, and a TTF dimer and derivatives thereof; and a divalent group —S-A-S— where A is a divalent aliphatic group or a divalent group represented by the formula -E-D-E- where D represents a divalent alicyclic group, a divalent aromatic group, or a carbonyl group, and two Es each independently represent a divalent aliphatic group. Adjacent two tetravalent groups mentioned above are linked by one or two divalent groups mentioned above.Type: GrantFiled: February 15, 2011Date of Patent: May 16, 2017Assignee: PANASONIC CORPORATIONInventors: Nobuhiko Hojo, Yu Ohtsuka, Takafumi Tsukagoshi, Yohji Misaki
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Patent number: 9640335Abstract: An electrode of the present invention includes: an electrically conductive support (11); and an active material layer (12) provided on the electrically conductive support (11), containing an electrode active material (13) and an electrical conductivity assistant (14), wherein: the electrode active material (13) includes at least one of a first polymer compound having a tetrachalcogenofulvalene structure in a repetition unit of a main chain, and a second polymer compound which is a copolymer between a first unit which has the tetrachalcogenofulvalene structure in a side chain and a second unit which does not have the tetrachalcogenofulvalene structure in the side chain; and in active material layer (13), the electrode active material (13) does not form particles but covers at least a portion of a surface of the electrical conductivity assistant (14).Type: GrantFiled: December 24, 2010Date of Patent: May 2, 2017Assignee: PANASONIC CORPORATIONInventors: Takafumi Tsukagoshi, Yu Ohtsuka, Nobuhiko Hojo, Takakazu Yamamoto, Hiroki Fukumoto
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Publication number: 20150194665Abstract: An electrode active material for a power storage device of the invention includes an organic compound having, in the molecule, a plurality of electrode reaction sites and a linker site. The electrode reaction sites are residues of a 9,10-phenanthrenequinone compound that contributes to an electrochemical redox reaction. The linker site is disposed between the plurality of electrode reaction sites, does not contain any ketone group, and does not contribute to the electrochemical redox reaction. The electrode active material for a power storage device of the present invention is inhibited from being dissolved in an electrolyte and has a high energy density. By using the electrode active material, it is possible to obtain a power storage device having a high energy density and excellent charge/discharge cycle characteristics.Type: ApplicationFiled: March 19, 2015Publication date: July 9, 2015Inventors: Yu OHTSUKA, Nobuhiko HOJO, Junichi YOSHIDA, Toshiki NOKAMI
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Publication number: 20150104702Abstract: An electricity storage device including a positive electrode, a negative electrode, and an electrolytic solution located between the positive electrode and the negative electrode. At least one of the positive electrode 31 and the negative electrode contains an electricity storage material containing a polymerization product having a tetrachalcogenofulvalene structure in a repeat unit of a main chain.Type: ApplicationFiled: December 16, 2014Publication date: April 16, 2015Inventors: Nobuhiko HOJO, Yu OHTSUKA, Takakazu YAMAMOTO, Takahisa SHIMIZU, Takayuki SASAKI, Tomoaki YANAGIDA
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Patent number: 8945769Abstract: An electricity storage device including a positive electrode 31, a negative electrode 32, and an electrolytic solution 29 located between the positive electrode and the negative electrode. At least one of the positive electrode 31 and the negative electrode 32 contains an electricity storage material containing a polymerization product having a tetrachalcogenofulvalene structure in a repeat unit of a main chain.Type: GrantFiled: July 31, 2009Date of Patent: February 3, 2015Assignee: Panasonic CorporationInventors: Nobuhiko Hojo, Yu Ohtsuka, Takakazu Yamamoto, Takahisa Shimizu, Takayuki Sasaki, Tomoaki Yanagida
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Patent number: 8614019Abstract: Disclosed is an electricity storage device which can be charged/discharged at high rate and have high output, high capacity and excellent repeating charge/discharge characteristics, although it uses a non-carbon material as a negative electrode active material. Specifically disclosed is an electricity storage device comprising: a positive electrode collector; a positive electrode disposed on the positive electrode collector and including a positive electrode active material which can reversibly absorb/desorb at least anions; a negative electrode collector; and a negative electrode disposed on the negative electrode collector and including a negative electrode active material which can substantially absorb/desorb lithium ions reversibly.Type: GrantFiled: May 14, 2009Date of Patent: December 24, 2013Assignee: Panasonic CorporationInventors: Nobuhiko Hojo, Yu Ohtsuka, Shoichiro Watanabe, Kazuyoshi Honda
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Patent number: 8551652Abstract: An electricity storage material according to the present invention contains a copolymer compound of first units and second units, each first unit having a side chain which is an oxidation-reduction site having a it conjugate electron cloud and being of a structure represented by general formula (1) below, and each second unit having no oxidation-reduction reaction site as a side chain. In general formula (1), X1 to X4 are, independently, a sulfur atom, an oxygen atom, a selenium atom, or a tellurium atom; R1 and R2 are, independently, an acyclic or cyclic aliphatic group including at least one kind selected from the group consisting of a carbon atom, an oxygen atom, a nitrogen atom, a sulfur atom, a silicon atom, a phosphorus atom, and a boron atom, each including at least one or more double bonds; and one of R1 and R2 includes a bonding hand for binding to another portion which is a main chain or a side chain of the copolymer compound.Type: GrantFiled: June 25, 2009Date of Patent: October 8, 2013Assignee: Panasonic CorporationInventors: Takafumi Tsukagoshi, Nobuhiko Hojo, Yu Ohtsuka
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Patent number: 8481674Abstract: A polymer having a repeating unit structure represented by the following general formula (1), wherein in general formula (1), Ph is a phenyl group; X is an oxygen atom, a sulfur atom, a selenium atom or a tellurium atom; and R1 and R1 each independently contains at least one selected from the group consisting of a chained saturated hydrocarbon group, a chained unsaturated hydrocarbon group, a cyclic saturated hydrocarbon group, a cyclic unsaturated hydrocarbon group, a phenyl group, a hydrogen atom, a hydroxyl group, a cyano group, an amino group, a nitro group and a nitroso group.Type: GrantFiled: July 31, 2009Date of Patent: July 9, 2013Assignee: Panasonic CorporationInventors: Takakazu Yamamoto, Hiroki Fukumoto, Takahisa Shimizu, Tomoaki Yanagida, Yu Ohtsuka, Nobuhiko Hojo
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Publication number: 20120328944Abstract: An electrode of the present invention includes: an electrically conductive support (11); and an active material layer (12) provided on the electrically conductive support (11), containing an electrode active material (13) and an electrical conductivity assistant (14), wherein: the electrode active material (13) includes at least one of a first polymer compound having a tetrachalcogenofulvalene structure in a repetition unit of a main chain, and a second polymer compound which is a copolymer between a first unit which has the tetrachalcogenofulvalene structure in a side chain and a second unit which does not have the tetrachalcogenofulvalene structure in the side chain; and in active material layer (13), the electrode active material (13) does not form particles but covers at least a portion of a surface of the electrical conductivity assistant (14).Type: ApplicationFiled: December 24, 2010Publication date: December 27, 2012Applicant: Panasonic CorporationInventors: Takafumi Tsukagoshi, Yu Ohtsuka, Nobuhiko Hojo, Takakazu Yamamoto, Hiroki Fukumoto
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Patent number: 8338027Abstract: Disclosed is a novel organic compound synthesized by oligomerizing or polymerizing a specific quinone compound having two quinone groups at the ortho position and having a property such that the electron transfer occurs associated with a reversible redox reaction, the organic compound being insoluble in an organic solvent and having a high energy density, and thus being useful as an electrode active material for a power storage device. Using this organic compound as an electrode active material can improve the energy density, reduce the weight and size, and improve the functionality of the power storage device.Type: GrantFiled: March 7, 2008Date of Patent: December 25, 2012Assignee: Panasonic CorporationInventors: Yu Ohtsuka, Junichi Yoshida, Toshiki Nokami
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Patent number: 8338028Abstract: An electrode active material for a power storage device of the invention includes a ketone compound that includes a ring structure in a molecule, the ring structure being a five-membered or seven-membered ring composed of atoms at least three adjacent ones of which are each bonded to a ketone group. The electrode active material for a power storage device of the invention has a high weight-energy density and good reversibility of oxidation-reduction reaction. The use of the electrode active material for a power storage device of the invention can provide a power storage device having a high capacity, a high voltage, and good charge/discharge cycle characteristics.Type: GrantFiled: February 16, 2009Date of Patent: December 25, 2012Assignee: Panasonic CorporationInventors: Nobuhiko Hojo, Yu Ohtsuka, Junichi Yoshida, Toshiki Nokami
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Patent number: 8263241Abstract: A method for producing a secondary cell according to the present invention includes step (A) of putting a solution having an electrochemically reversibly oxidizable/reducible organic compound and a supporting electrolyte dissolved therein into contact with a positive electrode active material, thereby oxidizing or reducing the positive electrode active material; and step (B) of accommodating the oxidized positive electrode active material and a negative electrode active material in a case in the state of facing each other with a separator being placed therebetween, and filling the case with an electrolyte solution. By oxidizing or reducing the positive electrode active material, lithium ions or anions as the support electrode are incorporated into the positive electrode active material.Type: GrantFiled: April 5, 2007Date of Patent: September 11, 2012Assignee: Panasonic CorporationInventors: Yu Ohtsuka, Nobuhiko Hojo
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Publication number: 20120156572Abstract: Disclosed are an electrode active material for a power storage device and a power storage device including the same. The electrode active material includes a polymer that includes: a tetravalent group derived from a compound selected from the group consisting of EBDT and derivatives thereof, TTF and derivatives thereof, a condensation product of EBDT and TTF and derivatives thereof, and a TTF dimer and derivatives thereof; and a divalent group —S-A-S— where A is a divalent aliphatic group or a divalent group represented by the formula -E-D-E- where D represents a divalent alicyclic group, a divalent aromatic group, or a carbonyl group, and two Es each independently represent a divalent aliphatic group. Adjacent two tetravalent groups mentioned above are linked by one or two divalent groups mentioned above.Type: ApplicationFiled: February 15, 2011Publication date: June 21, 2012Inventors: Nobuhiko Hojo, Yu Ohtsuka, Takafumi Tsukagoshi, Yohji Misaki
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Publication number: 20110143197Abstract: An electrode active material for a power storage device of the invention includes an organic compound having, in the molecule, a plurality of electrode reaction sites and a linker site. The electrode reaction sites are residues of a 9,10-phenanthrenequinone compound that contributes to an electrochemical redox reaction. The linker site is disposed between the plurality of electrode reaction sites, does not contain any ketone group, and does not contribute to the electrochemical redox reaction. The electrode active material for a power storage device of the present invention is inhibited from being dissolved in an electrolyte and has a high energy density. By using the electrode active material, it is possible to obtain a power storage device having a high energy density and excellent charge/discharge cycle characteristics.Type: ApplicationFiled: February 16, 2009Publication date: June 16, 2011Inventors: Yu Ohtsuka, Nobuhiko Hojo, Junichi Yoshida, Toshiki Nokami
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Publication number: 20110091767Abstract: An electricity storage device including a positive electrode 31, a negative electrode 32, and an electrolytic solution 29 located between the positive electrode and the negative electrode. At least one of the positive electrode 31 and the negative electrode 32 contains an electricity storage material containing a polymerization product having a tetrachalcogenofulvalene structure in a repeat unit of a main chain.Type: ApplicationFiled: July 31, 2009Publication date: April 21, 2011Inventors: Nobuhiko Hojo, Yu Ohtsuka, Takakazu Yamamoto, Takahisa Shimizu, Takayuki Sasaki, Tomoaki Yanagida
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Publication number: 20110086267Abstract: A polymer having a structure represented by the following general formula (1), wherein in general formula (1), Ph is a phenyl group; X is an oxygen atom, a sulfur atom, a selenium atom or a tellurium atom; and R1 and R1 each independently contains at least one selected from the group consisting of a chained saturated hydrocarbon group, a chained unsaturated hydrocarbon group, a cyclic saturated hydrocarbon group, a cyclic unsaturated hydrocarbon group, a phenyl group, a hydrogen atom, a hydroxyl group, a cyano group, an amino group, a nitro group and a nitroso group. The chained saturated hydrocarbon group, the chained unsaturated hydrocarbon group, the cyclic saturated hydrocarbon group and the cyclic unsaturated hydrocarbon group each contain at least one selected from the group consisting of a carbon atom, an oxygen atom, a nitrogen atom, a sulfur atom and a silicon atom.Type: ApplicationFiled: July 31, 2009Publication date: April 14, 2011Inventors: Takakazu Yamamoto, Hiroki Fukumoto, Takahisa Shimizu, Tomoaki Yanagida, Yu Ohtsuka, Nobuhiko Hojo
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Publication number: 20110003201Abstract: An electricity storage material according to the present invention contains a copolymer compound of first units and second units, each first unit having a side chain which is an oxidation-reduction site having a it conjugate electron cloud and being of a structure represented by general formula (1) below, and each second unit having no oxidation-reduction reaction site as a side chain. In general formula (1), X1 to X4 are, independently, a sulfur atom, an oxygen atom, a selenium atom, or a tellurium atom; R1 and R2 are, independently, an acyclic or cyclic aliphatic group including at least one kind selected from the group consisting of a carbon atom, an oxygen atom, a nitrogen atom, a sulfur atom, a silicon atom, a phosphorus atom, and a boron atom, each including at least one or more double bonds; and one of R1 and R2 includes a bonding hand for binding to another portion which is a main chain or a side chain of the copolymer compound.Type: ApplicationFiled: June 25, 2009Publication date: January 6, 2011Inventors: Takafumi Tsukagoshi, Nobuhiko Hojo, Yu Ohtsuka
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Publication number: 20100196758Abstract: An electrode active material for a power storage device of the invention includes a ketone compound that includes a ring structure in a molecule, the ring structure being a five-membered or seven-membered ring composed of atoms at least three adjacent ones of which are each bonded to a ketone group. The electrode active material for a power storage device of the invention has a high weight-energy density and good reversibility of oxidation-reduction reaction. The use of the electrode active material for a power storage device of the invention can provide a power storage device having a high capacity, a high voltage, and good charge/discharge cycle characteristics.Type: ApplicationFiled: February 16, 2009Publication date: August 5, 2010Inventors: Nobuhiko Hojo, Yu Ohtsuka, Junichi Yoshida, Toshiki Nokami
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Publication number: 20100047688Abstract: Disclosed is a novel organic compound synthesized by oligomerizing or polymerizing a specific quinone compound having two quinone groups at the ortho position and having a property such that the electron transfer occurs associated with a reversible redox reaction, the organic compound being insoluble in an organic solvent and having a high energy density, and thus being useful as an electrode active material for a power storage device. Using this organic compound as an electrode active material can improve the energy density, reduce the weight and size, and improve the functionality of the power storage device.Type: ApplicationFiled: March 7, 2008Publication date: February 25, 2010Inventors: Yu Ohtsuka, Junichi Yoshida, Toshiki Nokami