Patents by Inventor Yuichi Kamijo
Yuichi Kamijo 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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Patent number: 10522821Abstract: A graphite powder, preferably including scale-like particles, which satisfies the following formulae (1) and (2), wherein e(0.5) represents the initial charge-discharge efficiency of a coin cell fabricated from an electrode (work electrode) produced by compressing an electrode material employing graphite powder as an active material under a pressure of 0.5 t/cm2, a lithium metal counter electrode, a separator and an electrolytic solution; and e(3) represents the initial charge-discharge efficiency of a coin cell fabricated from an electrode (work electrode) produced by compressing an electrode material employing graphite powder as an active material under a pressure of 3 t/cm2, a lithium metal counter electrode, a separator and an electrolytic solution: e(3)(%)?e(0.5)(%)?1,??formula (1): e(3)(%)>85.??formula (2): Also disclosed is a method of producing the graphite powder; a graphite material for a battery electrode; an electrode for a lithium ion; and a lithium-ion secondary battery.Type: GrantFiled: May 18, 2018Date of Patent: December 31, 2019Assignee: SHOWA DENKO K.K.Inventors: Yasuaki Wakizaka, Yuichi Kamijo, Daisuke Kono, Yoshikuni Sato
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Publication number: 20180269469Abstract: A graphite powder, preferably including scale-like particles, which satisfies the following formulae (1) and (2), wherein e(0.5) represents the initial charge-discharge efficiency of a coin cell fabricated from an electrode (work electrode) produced by compressing an electrode material employing graphite powder as an active material under a pressure of 0.5 t/cm2, a lithium metal counter electrode, a separator and an electrolytic solution; and e(3) represents the initial charge-discharge efficiency of a coin cell fabricated from an electrode (work electrode) produced by compressing an electrode material employing graphite powder as an active material under a pressure of 3 t/cm2, a lithium metal counter electrode, a separator and an electrolytic solution: e(3)(%)?e(0.5)(%)?1,??formula (1): e(3)(%)>85.??formula (2): Also disclosed is a method of producing the graphite powder; a graphite material for a battery electrode; an electrode for a lithium ion; and a lithium-ion secondary battery.Type: ApplicationFiled: May 18, 2018Publication date: September 20, 2018Applicant: SHOWA DENKO K.K.Inventors: Yasuaki WAKIZAKA, Yuichi KAMIJO, Daisuke KONO, Yoshikuni SATO
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Publication number: 20180261828Abstract: A graphite powder, preferably including scale-like particles, which satisfies the following formulae (1) and (2), wherein e(0.5) represents the initial charge-discharge efficiency of a coin cell fabricated from an electrode (work electrode) produced by compressing an electrode material employing graphite powder as an active material under a pressure of 0.5 t/cm2, a lithium metal counter electrode, a separator and an electrolytic solution; and e(3) represents the initial charge-discharge efficiency of a coin cell fabricated from an electrode (work electrode) produced by compressing an electrode material employing graphite powder as an active material under a pressure of 3 t/cm2, a lithium metal counter electrode, a separator and an electrolytic solution: e(3)(%)?e(0.5)(%)?1,??formula (1): e(3)(%)>85.??formula (2): Also disclosed is a method of producing the graphite powder; a graphite material for a battery electrode; an electrode for a lithium ion; and a lithium-ion secondary battery.Type: ApplicationFiled: May 8, 2018Publication date: September 13, 2018Applicant: SHOWA DENKO K.K.Inventors: Yasuaki WAKIZAKA, Yuichi KAMIJO, Daisuke KONO, Yoshikuni SATO
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Patent number: 9997769Abstract: A graphite powder, preferably including scale-like particles, which satisfies the following formulae (1) and (2), wherein e(0.5) represents the initial charge-discharge efficiency of a coin cell fabricated from an electrode (work electrode) produced by compressing an electrode material employing graphite powder as an active material under a pressure of 0.5 t/cm2, a lithium metal counter electrode, a separator and an electrolytic solution; and e(3) represents the initial charge-discharge efficiency of a coin cell fabricated from an electrode (work electrode) produced by compressing an electrode material employing graphite powder as an active material under a pressure of 3 t/cm2, a lithium metal counter electrode, a separator and an electrolytic solution: e(3)(%)?e(0.5)(%)?1,??formula (1): e(3)(%)>85.??formula (2): Also disclosed is a method of producing the graphite powder; a graphite material for a battery electrode; an electrode for a lithium ion; and a lithium-ion secondary battery.Type: GrantFiled: February 3, 2014Date of Patent: June 12, 2018Assignee: SHOWA DENKO K.K.Inventors: Yasuaki Wakizaka, Yuichi Kamijo, Daisuke Kono, Yoshikuni Sato
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Publication number: 20170155149Abstract: A carbon material, being a not-scaly carbon material having specific optical structures, wherein the ratio between the peak intensity I110 of plane (110) and the peak intensity I004 of plane (004) of a graphite crystal determined by the powder XRD measurement, I110/I004, is 0.1 to 0.6; an average circularity is 0.80 to 0.95; d002 is 0.337 nm or less; and the total pore volume of pores having a diameter of 0.4 ?m or less measured by the nitrogen gas adsorption method is 8.0 ?l/g to 20.0 ?l/g; and a production method of the same.Type: ApplicationFiled: May 25, 2015Publication date: June 1, 2017Applicant: SHOWA DENKO K.K.Inventors: Naoto KAWAGUCHI, Yasuaki WAKIZAKA, Yuichi KAMIJO, Yoshiki SHIMODAIRA, Yoshikuni SATO
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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: 20150364751Abstract: A graphite powder, preferably including scale-like particles, which satisfies the following formulae (1) and (2), wherein e(0.5) represents the initial charge-discharge efficiency of a coin cell fabricated from an electrode (work electrode) produced by compressing an electrode material employing graphite powder as an active material under a pressure of 0.5 t/cm2, a lithium metal counter electrode, a separator and an electrolytic solution; and e(3) represents the initial charge-discharge efficiency of a coin cell fabricated from an electrode (work electrode) produced by compressing an electrode material employing graphite powder as an active material under a pressure of 3 t/cm2, a lithium metal counter electrode, a separator and an electrolytic solution: e(3)(%)?e(0.5)(%)?1,??formula (1): e(3)(%)>85.??formula (2): Also disclosed is a method of producing the graphite powder; a graphite material for a battery electrode; an electrode for a lithium ion; and a lithium-ion secondary battery.Type: ApplicationFiled: February 3, 2014Publication date: December 17, 2015Applicant: SHOWA DENKO K.K.Inventors: Yasuaki WAKIZAKA, Yuichi KAMIJO, Daisuke KONO, Yoshikuni SATO
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Publication number: 20150263348Abstract: 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: ApplicationFiled: October 11, 2013Publication date: September 17, 2015Applicant: 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: 20150162600Abstract: A scale-like carbon material and carbon material for a battery electrode 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 when an edge surface of the particle of the scale-like carbon material is measured with by 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 carbon material 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: ApplicationFiled: June 27, 2013Publication date: June 11, 2015Applicant: SHOWA DENKO K.K.Inventors: Yasuaki Wakizaka, Yuichi Kamijo, Tomohiro Abe, Yoshiki Shimodaira, Akinori Sudoh, Chiaki Sotowa, Yoshihito Yokoyama, Takashi Terashima