Patents by Inventor Chiaki Sotowa
Chiaki Sotowa 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: 10535866Abstract: A scale-like graphite and carbon material for a battery electrode which is suitable for use as an electrode material for an aqueous-electrolyte secondary battery, wherein the ratio IG/ID (G value) between the peak area (ID) in a range of 1300 to 1400 cm?1 and the peak area (IG) in a range of 1580 to 1620 cm?1 by Raman spectroscopy spectra, in which an edge surface of the particle of the scale-like graphite is measured with by a Raman microspectrometer, is 5.2 to 100 and the average interplanar spacing d002 of plane (d002) by the X-ray diffraction method is 0.337 nm or less and optical structures of the scale-like graphite have a specific shape; the method for producing the same; a carbon material for a battery electrode and a paste for an electrode containing the material; and a secondary battery having excellent charge/discharge cycle characteristics and high current load characteristics.Type: GrantFiled: June 27, 2013Date of Patent: January 14, 2020Assignee: SHOWA DENKO K.K.Inventors: Yasuaki Wakizaka, Yuichi Kamijo, Tomohiro Abe, Yoshiki Shimodaira, Akinori Sudoh, Chiaki Sotowa, Yoshihito Yokoyama, Takashi Terashima
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Publication number: 20190305293Abstract: An all-solid-state lithium ion battery, including a solid electrolyte, a negative electrode, and a positive electrode. The solid electrolyte includes at least one selected from oxide-based and sulfide-based solid electrolytes, and has a 50% diameter (D50) in a cumulative particle diameter distribution on a volume basis of from 0.1 ?m to 10 ?m. The negative electrode includes the solid electrolyte, a negative electrode active material and a conductive additive. The negative electrode active material includes graphite particles each having an interlayer spacing d002 of a graphite crystal of from 0.3360 nm to 0.3370 nm and having a D50 of from 1 ?m to 10 ?m. The negative electrode includes 35 to 45 parts by mass of the negative electrode active material, 45 to 55 parts by mass of the solid electrolyte, and 5 to 10 parts by mass of the conductive additive.Type: ApplicationFiled: December 25, 2017Publication date: October 3, 2019Applicant: SHOWA DENKO K. K.Inventors: Chiaki SOTOWA, Masataka TAKEUCHI
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Patent number: 10377634Abstract: A carbon material and a material for a battery electrode which is suitable for use as an electrode material for an aqueous-electrolyte secondary battery, which material includes optical structures having a specific shape, and in which material the ratio IG/ID (R value) between the peak intensity (ID) of a peak in a range of 1300 to 1400 cm?1 and the peak intensity (IG) of a peak in a range of 1580 to 1620 cm?1 measured by Raman spectroscopy spectra when particles of the carbon material are measured with Raman microspectrometer is 0.38 or more and 1.2 or less and the average interplanar spacing d002 of plane (002) by the X-ray diffraction method is 0.335 nm or more and 0.338 nm or less; and a secondary battery excellent in charge/discharge cycle characteristics and large current load characteristics.Type: GrantFiled: October 31, 2018Date of Patent: August 13, 2019Assignee: SHOWA DENKO K.K.Inventors: Chiaki Sotowa, Takashi Terashima, Yasuaki Wakizaka
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Publication number: 20190062162Abstract: A carbon material and a material for a battery electrode which is suitable for use as an electrode material for an aqueous-electrolyte secondary battery, which material includes optical structures having a specific shape, and in which material the ratio IG/ID (R value) between the peak intensity (ID) of a peak in a range of 1300 to 1400 cm?1 and the peak intensity (IG) of a peak in a range of 1580 to 1620 cm?1 measured by Raman spectroscopy spectra when particles of the carbon material are measured with Raman microspectrometer is 0.38 or more and 1.2 or less and the average interplanar spacing d002 of plane (002) by the X-ray diffraction method is 0.335 nm or more and 0.338 nm or less; and a secondary battery excellent in charge/discharge cycle characteristics and large current load characteristics.Type: ApplicationFiled: October 31, 2018Publication date: February 28, 2019Applicant: SHOWA DENKO K.K.Inventors: Chiaki SOTOWA, Takashi TERASHIMA, Yasuaki WAKIZAKA
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Patent number: 10144646Abstract: The present invention provides a carbon material and a material for a battery electrode which is suitable for use as an electrode material for an aqueous-electrolyte secondary battery, which material comprises optical structures having a specific shape, and in which material the ratio IG/ID (R value) between the peak intensity (ID) of a peak in a range of 1300 to 1400 cm?1 and the peak intensity (IG) of a peak in a range of 1580 to 1620 cm?1 measured by Raman spectroscopy spectra when particles of the carbon material are measured with Raman microspectrometer is 0.38 or more and 1.2 or less and the average interplanar spacing d002 of plane (002) by the X-ray diffraction method is 0.335 nm or more and 0.338 nm or less; and a secondary battery excellent in charge/discharge cycle characteristics and large current load characteristics.Type: GrantFiled: July 28, 2014Date of Patent: December 4, 2018Assignee: SHOWA DENKO K.K.Inventors: Chiaki Sotowa, Takashi Terashima, Yasuaki Wakizaka
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Publication number: 20180226649Abstract: A carbon material for negative electrodes in lithium ion secondary battery, wherein a specific surface area is not less than 1.5 m2/g and not more than 6.5 m2/g, a tap density is not less than 0.5 g/cm3 and not more than 1.3 g/cm3, a Raman R value is not less than 0.1 and not more than 0.4, no diffraction peak is present in a range of diffraction angle of 42.7° to 43.7° in X-ray diffraction analysis, d002 is not more than 0.337 nm, and at most one peak is present in a range of not less than 500° C. and less than 1000° C. in thermogravimetric-differential thermal analysis.Type: ApplicationFiled: April 4, 2018Publication date: August 9, 2018Applicant: SHOWA DENKO K.K.Inventors: Yasuaki WAKIZAKA, Chiaki SOTOWA, Takashi TERASHIMA
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Patent number: 9905839Abstract: A composite electrode material consisting of a carbon coated complex oxide, fibrous carbon and a binder. Said material is prepared by a method which includes 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: GrantFiled: January 7, 2014Date of Patent: February 27, 2018Assignees: HYDRO-QUEBEC, SHOWA DENKO K.K.Inventors: Karim Zaghib, Chiaki Sotowa, Patrick Charest, Masataka Takeuchi, Abdelbast Guerfi
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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: 9614218Abstract: A composite carbon particle for use in a negative electrode of a lithium-ion secondary battery, the composite carbon particle including a core particle composed of a carbon material obtained by heating, at not higher than 2500° C., petroleum coke having a Hardgrove grindability index (HGI value) of 30 to 60 (defined by ASTM D409), and a covering layer composed of a carbonaceous material obtained by heating an organic compound at 1000° C. to 2000° C. The composite carbon particle has a 50% particle diameter (D50) of 1 ?m to 30 ?m in a volume-based cumulative particle size distribution as measured by a laser diffraction method.Type: GrantFiled: October 11, 2013Date of Patent: April 4, 2017Assignee: SHOWA DENKO K.K.Inventors: Masataka Takeuchi, Yoshihito Yokoyama, Chiaki Sotowa
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Patent number: 9531008Abstract: The present invention relates to a lithium battery positive electrode comprising an active substance that can occlude and release lithium ion, a carbon-based conductivity enhancer, and a binder, characterized in that the positive electrode contains the carbon-based conductivity enhancer in an amount of 0.1 to 2 mass % on the basis of the entire mass of the positive electrode, and that the carbon-based conductivity enhancer contains a carbon fiber having a mean fiber diameter of 1 to 200 nm, wherein the active substance that can occlude and release lithium ion is contained in an amount, as calculated from the true density of the active substance, of 70% by volume or more on the basis of the total volume of the positive electrode; and relates to a lithium battery using the a lithium battery positive electrode. The positive electrode obtained by the present invention has an excellent electrolyte permeability and electrolyte retention. Therefore, it is better adapted to high-density lithium battery.Type: GrantFiled: August 12, 2005Date of Patent: December 27, 2016Assignee: SHOWA DENKO K.K.Inventors: Masataka Takeuchi, Chiaki Sotowa
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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: 9419281Abstract: 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: GrantFiled: April 16, 2009Date of Patent: August 16, 2016Assignee: SHOWA DENKO K.K.Inventors: Kyung-Hee Han, Jeong-Hun Oh, Jong-Sung Kim, Chul Youm, Masataka Takeuchi, Akinori Sudoh, Chiaki Sotowa
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Patent number: 9406936Abstract: A carbon material containing boron atom in an amount of 0.001 to 0.5 mass %, in which the average interplanar spacing (d002) of plane (002) is 0.337 nm or less. By observing optical structures in cross-section of formed bodies made of the carbon material, when areas are accumulated from a smallest structure in an ascending order, SOP represents an area of an optical structure whose accumulated area corresponds to 60% of the total area of all optical structures; when the structures are counted from a structure of a smallest aspect ratio in an ascending order, AROP represents the aspect ratio of the structure which ranks at the position of 60% in total number of all the structures; and when D50 represents an average particle diameter; SOP, AROP and D50 satisfy the following relationship: 1.5?AROP?6 and 0.2×D50?(SOP×AROP)1/2<2×D50. Also disclosed is a secondary battery using the carbon material as an electrode material.Type: GrantFiled: October 11, 2013Date of Patent: August 2, 2016Assignee: SHOWA DENKO K.K.Inventors: Yasuaki Wakizaka, Yuichi Kamijo, Tomohiro Abe, Yoshiki Shimodaira, Akinori Sudoh, Chiaki Sotowa, Yoshihito Yokoyama, Takashi Terashima, Naoto Kawaguchi
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Publication number: 20160185600Abstract: The present invention provides a carbon material and a material for a battery electrode which is suitable for use as an electrode material for an aqueous-electrolyte secondary battery, which material comprises optical structures having a specific shape, and in which material the ratio IG/ID (R value) between the peak intensity (ID) of a peak in a range of 1300 to 1400 cm?1 and the peak intensity (IG) of a peak in a range of 1580 to 1620 cm?1 measured by Raman spectroscopy spectra when particles of the carbon material are measured with Raman microspectrometer is 0.38 or more and 1.2 or less and the average interplanar spacing d002 of plane (002) by the X-ray diffraction method is 0.335 nm or more and 0.338 nm or less; and a secondary battery excellent in charge/discharge cycle characteristics and large current load characteristics.Type: ApplicationFiled: July 28, 2014Publication date: June 30, 2016Applicant: SHOWA DENKO K.K.Inventors: Chiaki SOTOWA, Takashi TERASHIMA, Yasuaki WAKIZAKA
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Patent number: 9368796Abstract: A graphite material having pores which, when 200 rectangular regions of 6 ?m×8 ?m are randomly selected in a surface image of the graphite material observed by a scanning electron microscope, in the surface of the graphite material appearing in the regions, a pore appearing on the surface and having an aperture in a shape having a diameter of 15 nm to 200 nm, a circularity degree of 0.75 to 1.0 and a major axis/minor axis ratio of 1.0 to 1.5 is visible in two regions or more. Also disclosed is a carbon material for battery electrodes, a paste for electrodes, an electrode and a lithium ion secondary battery including the graphite material.Type: GrantFiled: October 19, 2012Date of Patent: June 14, 2016Assignee: SHOW A DENKO K.K.Inventors: Yasuaki Wakizaka, Yuuichi Kamijou, Masataka Takeuchi, Takayuki Fukai, Chiaki Sotowa, Akinori Sudoh, Masako Tanaka
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Patent number: 9284192Abstract: A method for producing a graphie material for an electrode material for lithium ion batteries, including a step for exothermically graphitizing a carbon material by directly passing an electric current therethrough. The carbon material has an compact powder resistivity of 0.4 ?·cm or less when compressed to a density of 1.4 g/cm3, has an angle of repose in the range of 20° to 50° inclusive, and has a particle size (D90) in the volume-based particle size distribution measured using laser diffraction of 120 ?m or less. The average surface interval (d002) of a surface (002) of the carbon material after graphitization, measured using x-ray diffraction, is in the range of 0.3354 nm-0.3450 nm inclusive.Type: GrantFiled: October 19, 2012Date of Patent: March 15, 2016Assignee: SHOWA DENKO K.K.Inventors: Masataka Takeuchi, Yuuichi Kamijou, Yoshiyuki Nishimura, Ryusuke Miura, Takayuki Fukai, Chiaki Sotowa
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Patent number: 9276257Abstract: 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: February 21, 2014Date of Patent: March 1, 2016Assignee: SHOWA DENKO K.K.Inventors: Masataka Takeuchi, Chiaki Sotowa
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Patent number: 9240596Abstract: 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 battery.Type: GrantFiled: July 24, 2009Date of Patent: January 19, 2016Assignees: HYDRO-QUEBEC, SHOWA DENKO K.K.Inventors: Karim Zaghib, Chiaki Sotowa, Abdelbast Guerfi, Masataka Takeuchi, Patrick Charest
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Patent number: 9196899Abstract: An anode active material for use in a lithium secondary battery including a mixture of graphite I that has, according to X-ray powder diffraction, d002 of not smaller than 0.3354 nm and not greater than 0.337 nm, Lc(004) of smaller than 100 nm, La(110) of not smaller than 100 nm, and a half width of the peak of a plane (101) at a diffraction angle (2?) of 44 degrees to 45 degrees of not smaller than 0.65 degree and another graphite so as to have, according to X-ray powder diffraction, d002 of not smaller than 0.3354 nm and not greater than 0.337 nm, Lc(004) of not smaller than 80 nm, La(110) of not smaller than 100 nm, and a half width of the peak of a plane (101) at a diffraction angle (2?) of 44 degrees to 45 degrees of not smaller than 0.5 degree.Type: GrantFiled: August 5, 2011Date of Patent: November 24, 2015Assignee: SHOWA DENKO K.K.Inventors: Chiaki Sotowa, Takahiro Tamura
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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