Patents by Inventor Masataka Takeuchi
Masataka Takeuchi 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: 8388922Abstract: The present invention relates to a negative electrode material for a lithium battery comprising a carbonaceous negative electrode active substance having a specific surface area of 1 m2/g or more, a binder formed of styrene-butadiene rubber and a carbon fiber having a fiber diameter of 1 to 1,000 nm; and to a lithium battery using the negative electrode material, which has excellent characteristics, i.e., low electrode resistance, high electrode strength, excellent electrolytic solution permeability, high energy density, and good high-speed charging/discharging performance. The negative electrode material contains carbon fiber in the amount of 0.05 to 20 mass % and the binder formed of styrene-butadiene rubber in 0.1 to 6.0 mass %, and may further contain a thickener such as carboxymethyl cellulose in the amount of 0.3 to 3 mass %.Type: GrantFiled: April 19, 2011Date of Patent: March 5, 2013Assignees: Showa Denko K.K., Zeon CorporationInventors: Chiaki Sotowa, Masataka Takeuchi, Hidekazu Mori, Masahiro Yamakawa
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Publication number: 20130034775Abstract: A carbon negative electrode material for a lithium secondary battery includes: a core carbon material; and a coated layer covering the core carbon material and comprising a carbon coating material and carbon fiber.Type: ApplicationFiled: April 16, 2009Publication date: February 7, 2013Applicant: LS MTRON LTDInventors: Kyung-Hee Han, Jeong-Hun Oh, Jong-Sung Kim, Chul Youm, Jung-Min Han, Masataka Takeuchi, Akinori Sudoh, Chiaki Sotowa
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Publication number: 20120196193Abstract: The present invention provides composite graphite particles, which are useful for a negative electrode in a secondary battery having high capacitance, good charge-discharge characteristics and good charge-discharge cycle characteristics; and a paste for negative electrode, a negative electrode and a lithium secondary battery which use the composite graphite particles. The composite graphite particles of the present invention comprises a core material consisting of graphite having a interlayer distance d(002) of 0.337 nm or less in which the intensity ratio ID/IG (R value) between the peak intensity (ID) in a range of 1300 to 1400 cm?1 and the peak intensity (IG) in a range of 1580 to 1620 cm?1 as measured by Raman spectroscopy spectra is from 0.01 to 0.1 and a carbonaceous surface layer in which the intensity ratio ID/IG(R value) between the peak intensity (ID) in a range of 1300 to 1400 cm?1 and the peak intensity (IG) in a range of 1580 to 1620 cm?1 as measured by Raman scattering spectroscopy is 0.Type: ApplicationFiled: March 2, 2009Publication date: August 2, 2012Applicants: LS MTRON LTD., SHOWA DENKO K.K.Inventors: Chiaki Sotowa, Akinori Sudoh, Masataka Takeuchi, Kyung-hee Han, Jung-min Han, Jung-hun Oh
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Patent number: 8080228Abstract: A graphite material is provided wherein D50% is 2 to 9 ?m in particle diameter distribution based on volume as measured by laser diffraction, a specific surface area is 2 to 6 m2/g and no coating layer is substantially included in a surface of the particle. Also provided is a graphite material comprising substantially single-composition particles having an isotropic crystal structure, wherein D50% is 2 to 9 ?m in particle diameter distribution based on volume as measured by laser diffraction, and a specific surface area is 2 to 6 m2/g.Type: GrantFiled: May 12, 2010Date of Patent: December 20, 2011Assignee: Showa Denka K.K.Inventors: Akinori Sudoh, Masataka Takeuchi
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Publication number: 20110269016Abstract: The invention relates to an anode for lithium secondary battery comprising vapor grown carbon fiber uniformly dispersed without forming an agglomerate of 10 ?m or larger in an anode active material using natural graphite or artificial graphite, which anode is excellent in long cycle life and large current characteristics. Composition used for production for the anode can be produced, for example, by mixing a thickening agent solution containing an anode active material, a thickening agent aqueous solution and styrene butadiene rubber as binder with a composition containing carbon fiber dispersed in a thickening agent with a predetermined viscosity or by mixing an anode active material with vapor grown carbon fiber in dry state and then adding polyvinylidene difluoride thereto.Type: ApplicationFiled: July 12, 2011Publication date: November 3, 2011Applicant: SHOWA DENKO K.K.Inventors: Masataka TAKEUCHI, Chiaki Sotowa
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Publication number: 20110266495Abstract: The invention relates to a composite electrode material consisting of a carbon coated complex oxide, fibrous carbon and a binder. Said material is prepared by a method which comprises co-grinding an active electrode material and fibrous carbon, and adding a binder to the co-grinded mixture to lower the viscosity of the mixture. The fibrous carbon is preferably vapor grown carbon fibers.Type: ApplicationFiled: February 24, 2009Publication date: November 3, 2011Applicants: HYDRO-QUEBEC, SHOWA DENKO K.K.Inventors: KARIM ZAGHIB, CHIAKI SOTOWA, PATRICK CHAREST, MASATAKA TAKEUCHI, ABDELBAST GUERFI
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Publication number: 20110236767Abstract: Disclosed are a negative electrode for lithium secondary batteries, containing an active material (A) capable of absorbing/desorbing lithium ions and a binder (B), wherein the active material (A) is a carbon-based material obtained from at least one starting material selected from a group consisting of petroleum cokes and coal cokes and having a mean particle size of from 1 to 30 and a true density of from 1.90 to 2.00 g/cm3 and its use; and a method for producing a carbon-based negative electrode active material having a mean particle size of from 1 to 30 ?m and a true density of from 1.90 to 2.00 g/cm3, the method comprising (a) a step of grinding at least one selected from a group consisting of petroleum cokes and coal cokes, (b) a step of controlling the particle size, and (c) a step of heat-treating in an inert gas atmosphere at 900 to 1900° C.Type: ApplicationFiled: August 8, 2008Publication date: September 29, 2011Applicant: SHOWA DENKO K.K.Inventors: Chiaki Sotowa, Akinori Sudoh, Masataka Takeuchi
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Patent number: 8003257Abstract: The invention relates to an anode for lithium secondary battery comprising vapor grown carbon fiber uniformly dispersed without forming an agglomerate of 10 ?m or larger in an anode active material using natural graphite or artificial graphite, which anode is excellent in long cycle life and large current characteristics. Composition used for production for the anode can be produced, for example, by mixing a thickening agent solution containing an anode active material, a thickening agent aqueous solution and styrene butadiene rubber as binder with a composition containing carbon fiber dispersed in a thickening agent with a predetermined viscosity or by mixing an anode active material with vapor grown carbon fiber in dry state and then adding polyvinylidene difluoride thereto.Type: GrantFiled: July 3, 2006Date of Patent: August 23, 2011Assignee: Showa Denko K.K.Inventors: Masataka Takeuchi, Chiaki Sotowa
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Publication number: 20110193014Abstract: The present invention relates to a negative electrode material for a lithium battery comprising a carbonaceous negative electrode active substance having a specific surface area of 1 m2/g or more, a binder formed of styrene-butadiene rubber and a carbon fiber having a fiber diameter of 1 to 1,000 nm; and to a lithium battery using the negative electrode material, which has excellent characteristics, i.e., low electrode resistance, high electrode strength, excellent electrolytic solution permeability, high energy density, and good high-speed charging/discharging performance. The negative electrode material contains carbon fiber in the amount of 0.05 to 20 mass % and the binder formed of styrene-butadiene rubber in 0.1 to 6.0 mass %, and may further contain a thickener such as carboxymethyl cellulose in the amount of 0.3 to 3 mass %.Type: ApplicationFiled: April 19, 2011Publication date: August 11, 2011Applicants: SHOWA DENKO K.K., Zeon CorporationInventors: Chiaki SOTOWA, Masataka Takeuchi, Hidekazu Mori, Masahiro Yamakawa
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Publication number: 20110123858Abstract: The invention relates to a composite material comprising carbon fibers and complex oxide particles, wherein the carbon fibers and the complex oxide particles have a carbon coating on at least part of their surface, said carbon coating being a non powdery coating The material is prepared by a method comprising mixing a complex oxide or precursors thereof, an organic carbon precursor and carbon fibers, and subjecting the mixture to a heat treatment in an inert or reducing atmosphere for the decomposition of the precursors The material is useful as the cathode material in a batteryType: ApplicationFiled: July 24, 2009Publication date: May 26, 2011Applicants: HYDRO-QUEBEC, SHOWA DENKO K.K.Inventors: Karim Zaghib, Chiaki Sotowa, Abdelbast Guerfi, Masataka Takeuchi, Patrick Charest
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Publication number: 20110068294Abstract: The invention relates to a composite electrode material consisting of a carbon coated complex oxide, fibrous carbon and a binder. Said material is prepared by a method which comprises co-grinding an active electrode material and fibrous carbon, and adding a binder to the co-grinded mixture to lower the viscosity of the mixture. The fibrous carbon is preferably vapor grown carbon fibers.Type: ApplicationFiled: February 24, 2009Publication date: March 24, 2011Applicant: SHOWA DENKO K.K.Inventors: Karim Zaghib, Chiaki Sotowa, Patrick Charest, Masataka Takeuchi, Abdelbast Guerfi
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Publication number: 20100221543Abstract: A graphite material is provided wherein D50% is 2 to 9 ?m in particle diameter distribution based on volume as measured by laser diffraction, a specific surface area is 2 to 6 m2/g and no coating layer is substantially included in a surface of the particle. Also provided is a graphite material comprising substantially single-composition particles having an isotropic crystal structure, wherein D50% is 2 to 9 ?m in particle diameter distribution based on volume as measured by laser diffraction, and a specific surface area is 2 to 6 m2/g.Type: ApplicationFiled: May 12, 2010Publication date: September 2, 2010Applicant: SHOWA DENKO K.K.Inventors: Akinori Sudoh, Masataka Takeuchi
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Patent number: 7763365Abstract: A polymer light emitting material, wherein the material has a light emitting mechanism based on transition from an excited triplet state to a ground state or transition through an excited triplet state to a ground state of an electron energy level, and the material comprises a nonionic light emitting part which constitutes a part of the polymer or is bound to the polymer. The polymer light emitting material exhibits high light emission efficiency above 5%, which is the limit of external quantum efficiency of fluorescence and can be designed so as to have a large area and hence are suitable for mass production of organic light emitting devices.Type: GrantFiled: February 6, 2008Date of Patent: July 27, 2010Assignee: Showa Denko K.K.Inventors: Masataka Takeuchi, Shuichi Naijo, Naoko Ito, Koro Shirane, Takashi Igarashi, Yoshiaki Takahashi, Motoaki Kamachi
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Patent number: 7736757Abstract: A polymer light emitting material, wherein the material has a light emitting mechanism based on transition from an excited triplet state to a ground state or transition through an excited triplet state to a ground state of an electron energy level, and the material comprises a nonionic light emitting part which constitutes a part of the polymer or is bound to the polymer. The polymer light emitting material exhibits high light emission efficiency above 5%, which is the limit of external quantum efficiency of fluorescence and can be designed so as to have a large area and hence are suitable for mass production of organic light emitting devices.Type: GrantFiled: February 6, 2008Date of Patent: June 15, 2010Assignee: Showa Denko K.K.Inventors: Masataka Takeuchi, Shuichi Naijo, Naoko Ito, Koro Shirane, Takashi Igarashi, Yoshiaki Takahashi, Motoaki Kamachi
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Patent number: 7635527Abstract: A polymer light emitting material, wherein the material has a light emitting mechanism based on transition from an excited triplet state to a ground state or transition through an excited triplet state to a ground state of an electron energy level, and the material comprises a nonionic light emitting part which constitutes a part of the polymer or is bound to the polymer. The polymer light emitting material exhibits high light emission efficiency above 5%, which is the limit of external quantum efficiency of fluorescence and can be designed so as to have a large area and hence are suitable for mass production of organic light emitting devices.Type: GrantFiled: February 6, 2008Date of Patent: December 22, 2009Assignee: Showa Denko K.K.Inventors: Masataka Takeuchi, Shuichi Naijo, Naoko Ito, Koro Shirane, Takeshi Igarashi, Yoshiaki Takahashi, Motoaki Kamachi
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Publication number: 20090242849Abstract: A carbon raw material such as a green coke in which loss on heat when it is heated from 300 to 1200° C. under an inert atmosphere is no less than 5% by mass and no more than 20% by mass is pulverized and then the pulverized carbon raw material is graphitized to obtain a graphite material suitable for a carbon material for anode in a lithium-ion secondary battery or the like that enables to make electrodes having a high-energy density and a large-current load characteristic since it has a small specific surface area and a small average particle diameter while maintaining high beginning efficiency and a high discharge capacity in the first round of charging and discharging. And an electrode for batteries are obtained using the graphite material.Type: ApplicationFiled: December 5, 2006Publication date: October 1, 2009Applicant: SHOWA DENKO K.K.Inventors: Akinori Sudoh, Masataka Takeuchi
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Publication number: 20090202917Abstract: The invention provides composite graphite particles, comprising a core material consisting of graphite having a interlayer distance d(002) of 0.337 nm or less and a surface layer consisting of graphite in which the intensity ratio ID/IG (R value) between the peak intensities (ID) in a range of 1300 to 1400 cm?1 and ( IG) in a range of 1580 to 1620 cm?1 as measured by Raman scattering spectroscopy is 0.3 or higher, wherein the peak intensity ratio I110/I004 between the peak intensities (I110)of face (110) and (I004)of face (004) obtained by XRD measurement on the graphite crystal is 0.15 or higher when the graphite has been mixed with a binder and pressure-molded to a density of 1.55 to 1.Type: ApplicationFiled: December 20, 2006Publication date: August 13, 2009Applicant: Showa Denko K.K.Inventors: Chiaki Sotowa, Masataka Takeuchi
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Patent number: 7572553Abstract: The invention relates to a high-density electrode, obtained by impregnating a high-density electrode which comprises an electrode active substance and carbon fiber having a fiber filament diameter of 1 to 1,000 nm and has a porosity of 25% or less, with a solid polymer electrolyte; and to a battery including the resultant (high-density) electrode. According to the invention, electrolytic solution permeability and electrolytic solution retainability, which are matters of importance in realizing a high-density electrode for achieving a battery having a high energy density, can be improved.Type: GrantFiled: July 27, 2004Date of Patent: August 11, 2009Assignee: Showa Denko K.K.Inventors: Takashi Ohkubo, Akinori Sudoh, Masataka Takeuchi
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Publication number: 20090123850Abstract: The invention relates to an anode for lithium secondary battery comprising vapor grown carbon fiber uniformly dispersed without forming an agglomerate of 10 ?m or larger in an anode active material using natural graphite or artificial graphite, which anode is excellent in long cycle life and large current characteristics. Composition used for production for the anode can be produced, for example, by mixing a thickening agent solution containing an anode active material, a thickening agent aqueous solution and styrene butadiene rubber as binder with a composition containing carbon fiber dispersed in a thickening agent with a predetermined viscosity or by mixing an anode active material with vapor grown carbon fiber in dry state and then adding polyvinylidene difluoride thereto.Type: ApplicationFiled: July 3, 2006Publication date: May 14, 2009Applicant: SHOWA DENKO K.K.Inventors: Masataka Takeuchi, Chiaki Sotowa
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Publication number: 20080290793Abstract: A polymer light emitting material, wherein the material has a light emitting mechanism based on transition from an excited triplet state to a ground state or transition through an excited triplet state to a ground state of an electron energy level, and the material comprises a nonionic light emitting part which constitutes a part of the polymer or is bound to the polymer. The polymer light emitting material exhibits high light emission efficiency above 5%, which is the limit of external quantum efficiency of fluorescence and can be designed so as to have a large area and hence are suitable for mass production of organic light emitting devices.Type: ApplicationFiled: February 6, 2008Publication date: November 27, 2008Applicant: Showa Denko K.K.Inventors: Masataka Takeuchi, Shuichi Naijo, Naoko Ito, Koro Shirane, Takeshi Igarashi, Yoshiaki Takahashi, Motoaki Kamachi