Patents by Inventor Hiromasa Yagi
Hiromasa Yagi 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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Publication number: 20120121794Abstract: A manufacturing method according to the present invention includes a step of allowing lithium to deposit on a substrate provided with a layer capable of forming a compound together with lithium. A first beta ray and a second beta ray are emitted toward the substrate for irradiation before the deposition step to measure backscattering, from the substrate, of the first beta ray and the second beta ray. The first beta ray and the second beta ray are emitted toward the substrate for irradiation after the deposition step to measure backscattering, from the substrate, of the first beta ray and the second beta ray. A decrement in backscattering of the first beta ray before and after lithium deposition and a decrement in backscattering of the second beta ray before and after lithium deposition are calculated. The deposition step is controlled depending on the decrement in the backscattering of the first beta ray and the decrement in the backscattering of the second beta ray.Type: ApplicationFiled: July 2, 2010Publication date: May 17, 2012Inventors: Hiromasa Yagi, Kazuyoshi Honda
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Publication number: 20110281029Abstract: Deterioration of the degree of vacuum in a vacuum chamber is prevented while securing adequate cooling performance by gas cooling. A substrate 21 is provided in a vacuum, and the cooling body 1 is provided close to a film non-formation surface of the substrate 21. A thin film is formed by depositing a film forming material on a film formation surface of the substrate 21 while introducing a cooling gas into between the substrate 21 and the cooling body 1. At this time, a gas which reacts with the film forming material is introduced as the cooling gas.Type: ApplicationFiled: December 10, 2009Publication date: November 17, 2011Inventors: Kazuyoshi Honda, Yasuharu Shinokawa, Hiromasa Yagi, Satoshi Shibutani, Sadayuki Okazaki, Yuko Ogawa, Daisuke Suetsugu
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Publication number: 20110136012Abstract: A negative electrode active material layer 3 containing at least one element selected from the group consisting of silicon, germanium, and tin is formed on a negative electrode collector 1. A negative electrode 11 is prepared by forming a lithium metal layer on the negative electrode active material layer 3. Also prepared is a positive electrode 11 having a configuration in which a positive electrode active material layer 6 containing a composite oxide represented by a general formula Li1-xMO2, where 0.2?x?0.6, and M includes at least one transition metal selected from the group consisting of cobalt, nickel, and manganese, is formed on a positive electrode current collector 5. A lithium secondary battery 100 is assembled from the negative electrode 13, the positive electrode 11, and a separator 4.Type: ApplicationFiled: July 31, 2009Publication date: June 9, 2011Inventors: Hiromasa Yagi, Kazuyoshi Honda
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Publication number: 20110070492Abstract: A method for producing an electrode for a lithium secondary battery according to the present invention includes (A) a step of causing a vaporized vapor deposition material to be incident on a surface of a current collector 11, having a plurality of bumps 12 at the surface thereof, in a direction 52 inclined with respect to the normal direction D to the surface of the current collector, thus to form an active material body 14 on each of the plurality of bumps 12 of the current collector 11; and (B) a step of stretching the current collector 11 having the active material bodies 14 formed thereon in at least one axial direction parallel to the surface of the current collector 11.Type: ApplicationFiled: May 20, 2009Publication date: March 24, 2011Inventors: Taisuke Yamamoto, Hiromasa Yagi, Masaya Ugaji
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Patent number: 7897284Abstract: A lithium secondary battery is provided with a positive electrode, a negative electrode (1), a separator interposed between the positive and negative electrodes, and an electrode assembly having the negative electrode (1), the positive electrode, and the separator. The negative electrode (1) has a negative electrode current collector (11) and negative electrode active material layers (12), (13) formed on respective surfaces of the negative electrode current collector (11). The negative electrode active material layers are composed of an alloy containing silicon, which intercalates and deintercalates lithium, and iron, which does not intercalate or deintercalate lithium.Type: GrantFiled: September 27, 2006Date of Patent: March 1, 2011Assignee: Sanyo Electric Co., Ltd.Inventors: Kei Kobayashi, Hiromasa Yagi, Masaki Hirase, Daizo Jito, Katsunobu Sayama
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Patent number: 7794881Abstract: An electrode for a lithium battery having a thin film composed of active material capable of lithium storage and release, e.g., a microcrystalline or amorphous silicon thin film, provided on a current collector, the electrode being characterized in that a constituent of the current collector is diffused into the thin film.Type: GrantFiled: October 20, 2000Date of Patent: September 14, 2010Assignee: Sanyo Electric Co., Ltd.Inventors: Masahisa Fujimoto, Shin Fujitani, Masaki Shima, Hiromasa Yagi, Hisaki Tarui, Hiroshi Kurokawa, Shigeki Matsuta, Yoichi Domoto, Yoshio Kato, Hiroshi Nakajima, Hiroaki Ikeda, Kenji Asaoka, Ryuji Ohshita
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Patent number: 7727580Abstract: A method of manufacturing an electrode for a lithium secondary battery in which a thin film of active material is deposited on a current collector is provided that eliminates adverse effects on the battery caused by protrusions adhered on an electrode surface. The method of manufacturing an electrode for lithium secondary batteries includes depositing a thin film of active material on a current collector using thin-film deposition equipment as shown in FIG. 1, and performing a compression process after depositing the thin film, whereby the heights of protrusions formed on the electrode surface are reduced.Type: GrantFiled: March 28, 2006Date of Patent: June 1, 2010Assignee: SANYO Electric Co., Ltd.Inventors: Masaki Hirase, Hiromasa Yagi, Daizo Jito, Kei Kobayashi, Katsunobu Sayama
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Patent number: 7659034Abstract: Charge-discharge cycle performance is improved in a lithium secondary battery including a negative electrode containing a negative electrode active material having silicon as its main component, provided on a surface of a current collector, a positive electrode containing a positive electrode active material, and a non-aqueous electrolyte. The positive electrode active material is a lithium transition metal oxide containing Li and Co and having a layered structure, and further containing a group IVA element of the periodic table, such as Zr, Ti, or Tf, and a group IIA element of the periodic table, such as Mg.Type: GrantFiled: November 19, 2004Date of Patent: February 9, 2010Assignee: SANYO Electric Co., Ltd.Inventors: Hiroshi Minami, Hiromasa Yagi, Katsunobu Sayama, Maruo Kamino
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Publication number: 20090280049Abstract: In a purifying method for metal grade silicon, metal grade silicon with a silicon concentration not less than 98 wt % and not more than 99.9 wt % is prepared. The metal grade silicon contains aluminum not less than 1000 ppm and not more than 10000 ppm by weight. The metal grade silicon is heated at a temperature not less than 1500° C. and not more than 1600° C. in an inert atmosphere under pressure not less than 100 Pa and not more than 1000 Pa, and maintained at the temperature in the atmosphere for a predetermined period.Type: ApplicationFiled: June 24, 2008Publication date: November 12, 2009Applicant: Panasonic CorporationInventors: Yuma Kamiyama, Kazuyoshi Honda, Yasuharu Shinokawa, Hiromasa Yagi, Tomofumi Yanagi, Kunihiko Bessho
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Patent number: 7410728Abstract: An electrode for lithium batteries, in which a thin film of active material capable of storage and release of lithium, such as a microcrystalline or amorphous silicon thin film, is provided, through an interlayer, on a current collector, the electrode being characterized in that the interlayer comprises a material alloyable with the thin film of active material.Type: GrantFiled: October 20, 2000Date of Patent: August 12, 2008Assignee: Sanyo Electric Co., Ltd.Inventors: Masahisa Fujimoto, Shin Fujitani, Masaki Shima, Hiromasa Yagi, Hisaki Tarui, Hiroshi Kurokawa, Shigeki Matsuta, Yoichi Domoto, Yoshio Kato, Hiroshi Nakajima, Hiroaki Ikeda, Kenji Asaoka, Ryuji Ohshita
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Patent number: 7241533Abstract: An electrode for a rechargeable lithium battery characterized in that thin films of active material capable of lithium storage and release, i.e., microcrystalline or amorphous silicone thin films are deposited on opposite faces of a plate-form current collector.Type: GrantFiled: October 20, 2000Date of Patent: July 10, 2007Assignee: Sanyo Electric Co., Ltd.Inventors: Hiroaki Ikeda, Masahisa Fujimoto, Shin Fujitani, Kenji Asaoka, Shigeki Matsuta, Yoichi Domoto, Ryuji Ohshita, Masaki Shima, Hiromasa Yagi, Hisaki Tarui, Hiroshi Kurokawa, Yoshio Kato, Hiroshi Nakajima, Toshikazu Yoshida
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Patent number: 7235330Abstract: An electrode for a lithium battery having a thin film composed of active material capable of lithium storage and release, e.g., a microcrystalline or amorphous silicon thin film, provided on a current collector, the electrode being characterized in that the current collector has a surface roughness Ra of 0.01 ?m or greater.Type: GrantFiled: October 20, 2000Date of Patent: June 26, 2007Assignee: Sanyo Electric Co., Ltd.Inventors: Masahisa Fujimoto, Shin Fujitani, Masaki Shima, Hiromasa Yagi, Hisaki Tarui, Hiroshi Kurokawa, Shigeki Matsuta, Yoichi Domoto, Yoshio Kato, Hiroshi Nakajima, Hiroaki Ikeda, Kenji Asaoka, Ryuji Ohshita
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Publication number: 20070077494Abstract: A lithium secondary battery is provided with a positive electrode, a negative electrode (1), a separator interposed between the positive and negative electrodes, and an electrode assembly having the negative electrode (1), the positive electrode, and the separator. The negative electrode (1) has a negative electrode current collector (11) and negative electrode active material layers (12), (13) formed on respective surfaces of the negative electrode current collector (11). The negative electrode active material layers are composed of an alloy containing silicon, which intercalates and deintercalates lithium, and iron, which does not intercalate or deintercalate lithium.Type: ApplicationFiled: September 27, 2006Publication date: April 5, 2007Applicant: SANYO ELECTRIC CO., LTD.Inventors: Kei Kobayashi, Hiromasa Yagi, Masaki Hirase, Daizo Jito, Katsunobu Sayama
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Patent number: 7195842Abstract: In an electrode for a lithium battery having a lithium storing and releasing active thin film provided on a current collector, such as a microcrystalline or amorphous silicon thin film, the electrode is characterized in that the thin film is divided into columns by gaps formed therein in a manner to extend in its thickness direction and that the columnar portions are at their bottoms adhered to the current collector.Type: GrantFiled: October 20, 2000Date of Patent: March 27, 2007Assignee: Sanyo Electric Co., Ltd.Inventors: Masahisa Fujimoto, Shin Fujitani, Masaki Shima, Hiromasa Yagi, Hisaki Tarui, Hiroshi Kurokawa, Shigeki Matsuta, Yoichi Domoto, Yoshio Kato, Hiroshi Nakajima, Hiroaki Ikeda, Kenji Asaoka, Ryuji Ohshita
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Patent number: 7192673Abstract: An electrode for a rechargeable lithium battery which includes a thin film composed of active material that expands and shrinks as it stores and releases lithium, e.g., a microcrystalline or amorphous silicon thin film, deposited on a current collector, characterized in that said current collector exhibits a tensile strength (=tensile strength (N/mm2) per sectional area of the current collector material×thickness (mm) of the current collector) of not less than 3.82 N/mm.Type: GrantFiled: October 20, 2000Date of Patent: March 20, 2007Assignee: Sanyo Electric Co., Ltd.Inventors: Hiroaki Ikeda, Masahisa Fujimoto, Shin Fujitani, Masaki Shima, Hiromasa Yagi, Hisaki Tarui, Hiroshi Kurokawa, Kenji Asaoka, Shigeki Matsuta, Yoichi Domoto, Ryuji Ohshita, Yoshio Kato, Hiroshi Nakajima, Yasuyuki Kusumoto
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Patent number: 7153611Abstract: A lithium secondary battery comprising an electrode in which an active material layer which includes an active material that electrochemically occludes and releases lithium is formed on a current collector, wherein cracks are formed in the active material layer by occlusion and release of lithium ions and thereafter a solid electrolyte is formed in the cracks in the active material layer.Type: GrantFiled: September 30, 2003Date of Patent: December 26, 2006Assignee: Sanyo Electric Co., Ltd.Inventors: Hiroshi Minami, Katsunobu Sayama, Hiromasa Yagi, Atsushi Fukui, Mariko Torimae, Yasuyuki Kusumoto, Hisaki Tarui
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Publication number: 20060228467Abstract: A method of manufacturing an electrode for a lithium secondary battery in which a thin film of active material is deposited on a current collector is provided that eliminates adverse effects on the battery caused by protrusions adhered on an electrode surface. The method of manufacturing an electrode for lithium secondary batteries includes depositing a thin film of active material on a current collector using thin-film deposition equipment as shown in FIG. 1, and performing a compression process after depositing the thin film, whereby the heights of protrusions formed on the electrode surface are reduced.Type: ApplicationFiled: March 28, 2006Publication date: October 12, 2006Inventors: Masaki Hirase, Hiromasa Yagi, Daizo Jito, Kei Kobayashi, Katsunobu Sayama
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Publication number: 20060024588Abstract: A rechargeable lithium battery including a negative electrode made by depositing a noncrystalline thin film composed entirely or mainly of silicon on a current collector, a positive electrode and a nonaqueous electrolyte, characterized in that said nonaqueous electrolyte contains carbon dioxide dissolved therein.Type: ApplicationFiled: June 3, 2004Publication date: February 2, 2006Applicant: Daizo Jito, Noriyuki Tamura, Nobuiro Sakitani, Hiroshi Minami, Hiromasa Yag, Maruo Kamino,Inventors: Daizo Jito, Noriyuki Tamura, Nobuhiro Sakitani, Hiroshi Minami, Hiromasa Yagi, Maruo Kamino, Katsunobu Sayama, Yoshio Kato, Shigeki Matsuta
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Patent number: 6899918Abstract: A method for manufacturing an electrode for a lithium secondary battery includes a step of forming an oxide film other than a natural oxide film on a current collector by oxidizing the surface of the current collector, and a step of forming an active material layer on the oxide film by a method to provide a material for the active material layer by emitting in the vapor phase, such as PVD (physical vapor deposition) including sputtering, vapor evaporation, and the like, and CVD (chemical vapor deposition) including plasma CVD.Type: GrantFiled: January 17, 2003Date of Patent: May 31, 2005Assignee: Sanyo Electric Co., Ltd.Inventors: Hiromasa Yagi, Hisaki Tarui
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Publication number: 20050106465Abstract: Charge-discharge cycle performance is improved in a lithium secondary battery including a negative electrode containing a negative electrode active material having silicon as its main component, provided on a surface of a current collector, a positive electrode containing a positive electrode active material, and a non-aqueous electrolyte. The positive electrode active material is a lithium transition metal oxide containing Li and Co and having a layered structure, and further containing a group IVA element of the periodic table, such as Zr, Ti, or Tf, and a group IIA element of the periodic table, such as Mg.Type: ApplicationFiled: November 19, 2004Publication date: May 19, 2005Inventors: Hiroshi Minami, Hiromasa Yagi, Katsunobu Sayama, Maruo Kamino