Patents by Inventor Atsuo Yamada

Atsuo Yamada 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).

  • Publication number: 20160226069
    Abstract: A low-cost positive electrode material for sodium ion secondary batteries has a high redox potential. A sodium ion secondary battery uses this material as a positive electrode active material. The positive electrode active material for sodium ion secondary batteries contains a sulfate represented by NamMn(SO4)3 (in which M represents a transition metal element; m is 2±2x (in which x satisfies 0?x?0.5); and n is 2±y (in which y satisfies 0?y?0.5)).
    Type: Application
    Filed: September 3, 2014
    Publication date: August 4, 2016
    Inventors: Atsuo YAMADA, Prabeer BARPANDA, Gosuke OYAMA, Shin-ichi NISHIMURA
  • Publication number: 20160226100
    Abstract: To improve battery characteristics by an optimum combination of an electrolytic solution and a negative electrode active material. An electrolytic solution of a nonaqueous electrolyte secondary battery contains a metal salt, and an organic solvent having a heteroatom and satisfying, regarding an intensity of a peak derived from the organic solvent in a vibrational spectroscopy spectrum, Is>Io, when an intensity of an original peak of the organic solvent is represented as Io and an intensity of a peak resulting from shifting of the original peak is represented as Is. As a negative electrode, any of the following (1) to (5) is used: (1) a graphite whose G/D ratio, which is a ratio of G-band and D-band peaks in a Raman spectrum, is not lower than 3.
    Type: Application
    Filed: September 25, 2014
    Publication date: August 4, 2016
    Applicant: THE UNIVERSITY OF TOKYO
    Inventors: Atsuo YAMADA, Yuki YAMADA, Yoshihiro NAKAGAKI, Tomoyuki KAWAI, Yuki HASEGAWA, Kohei MASE, Nobuhiro GODA
  • Publication number: 20160218390
    Abstract: A positive electrode of a nonaqueous secondary battery has a positive electrode active material including at least one selected from lithium metal complex oxides having a layered rock salt structure, lithium metal complex oxides having a spinel structure, and polyanion based materials. The electrolytic solution contains a metal salt whose cation is an alkali metal, an alkaline earth metal, or aluminum, and an organic solvent having a heteroelement. Regarding an intensity of a peak derived from the organic solvent in a vibrational spectroscopy spectrum of the electrolytic solution, when an intensity of an original peak of the organic solvent is represented as Io and an intensity of a peak resulting from shifting of the original peak is represented as Is; Is>Io is satisfied. The nonaqueous secondary battery may have a usage maximum potential of the positive electrode of not lower than 4.5 V when Li/Li+ is used for reference potential.
    Type: Application
    Filed: September 25, 2014
    Publication date: July 28, 2016
    Applicant: THE UNIVERSITY OF TOKYO
    Inventors: Atsuo YAMADA, Yuki YAMADA, Tomoyuki KAWAI, Yoshihiro NAKAGAKI, Kohei MASE, Yuki HASEGAWA, Nobuhiro GODA
  • Publication number: 20160218394
    Abstract: Provided is an electrolytic solution in which a metal salt and a solvent exist in a new state. The electrolytic solution of the present invention is an electrolytic solution containing a salt whose cation is an alkali metal, an alkaline earth metal, or aluminum, and an organic solvent having a heteroelement. Regarding an intensity of a peak derived from the organic solvent in a vibrational spectroscopy spectrum of the electrolytic solution, Is>Io is satisfied when an intensity of an original peak of the organic solvent is represented as Io and an intensity of a peak resulting from shifting of the original peak is represented as Is.
    Type: Application
    Filed: September 25, 2014
    Publication date: July 28, 2016
    Applicant: THE UNIVERSITY OF TOKYO
    Inventors: Atsuo YAMADA, Yuki YAMADA, Tomoyuki KAWAI, Yuki HASEGAWA, Yoshihiro NAKAGAKI, Kohei MASE, Manabu MIYOSHI, Junichi NIWA, Nobuhiro GODA
  • Publication number: 20150280230
    Abstract: The present invention provides a cell that has a high theoretical voltage and theoretical capacity, and can be discharged and recharged multiple times. The cell includes a cathode, an anode, and an electrolyte, wherein the cathode contains a cathode active material containing an alkali metal compound represented by the formula (1): AxOy??(1) (wherein A is an alkali metal atom, x is 0.5 to 2.5, and y is 0.5 to 2.5), the anode contains an anode active material containing at least one selected from the group consisting of an alkali metal, tin, titanium, boron, nitrogen, silicon, and carbon, and the cathode, the anode, and the electrolyte are hermetically sealed in the cell.
    Type: Application
    Filed: September 25, 2013
    Publication date: October 1, 2015
    Applicants: The University of Tokyo, Nippon Shokubai Co., Ltd.
    Inventors: Noritaka Mizuno, Tetsuichi Kudo, Mitsuhiro Hibino, Yoshiyuki Ogasawara, Yosuke Suga, Atsuo Yamada, Yuki Yamada, Shin-ichi Okuoka, Koji Yonehara, Hironobu Ono, Yasutaka Sumida
  • Patent number: 9112241
    Abstract: To provide a positive electrode active material containing a pyrophosphate compound, ensuring that mixing of impurities is easily prevented to facilitate the synthesis and a high capacity battery is obtained, and a lithium ion battery using the positive electrode material. That is, the present invention relates to a pyrophosphate compound represented by the formula: Li2M1-xFexP2O7 (wherein M represents one or more elements selected from Mn, Zr, Mg, Co, Ni, V and Cu, and 0.3?x?0.9).
    Type: Grant
    Filed: December 3, 2010
    Date of Patent: August 18, 2015
    Assignee: The University of Tokyo
    Inventors: Atsuo Yamada, Shinichi Nishimura, Ryuichi Natsui
  • Publication number: 20150050563
    Abstract: A new electrolytic solution system for lithium secondary batteries. Provided is a lithium secondary battery electrolytic solution containing a nonaqueous solvent and a lithium salt. The nonaqueous solvent is mixed at an amount of not more than 3 mol with respect to 1 mol of the lithium salt.
    Type: Application
    Filed: March 25, 2013
    Publication date: February 19, 2015
    Applicant: THE UNIVERSITY OF TOKYO
    Inventors: Yuki Yamada, Atsuo Yamada, Makoto Yaegashi, Haosheu Zhou, Fujun Li
  • Patent number: 8349217
    Abstract: The present invention has features in that a lithium transition metal silicate obtained by sintering a mixture containing a transition metal compound containing at least one transition metal selected from the group consisting of Mn, Fe, Co and Ni; a lithium compound; and a silicon-based polymer compound, is used as a positive electrode material for a secondary battery. The lithium transition metal silicate of the present invention has a high lithium occlusion and release efficiency per unit amount of a transition metal. A secondary battery in which the cost is low, stability and safety are high, and superior charge and discharge characteristics are exhibited can be provided.
    Type: Grant
    Filed: March 26, 2008
    Date of Patent: January 8, 2013
    Assignees: Tokyo Institute of Technology, Dow Corning Toray Co., Ltd
    Inventors: Atsuo Yamada, Shogo Hayase, Yoshiki Fujita, Shinichi Nishimura, Mamoru Tachikawa, Takakazu Hino
  • Publication number: 20120235082
    Abstract: To provide a positive electrode active material containing a pyrophosphate compound, ensuring that mixing of impurities is easily prevented to facilitate the synthesis and a high capacity battery is obtained, and a lithium ion battery using the positive electrode material. That is, the present invention relates to a pyrophosphate compound represented by the formula: Li2M1-xFexP2O7 (wherein M represents one or more elements selected from Mn, Zr, Mg, Co, Ni, V and Cu, and 0.3?x?0.9).
    Type: Application
    Filed: December 3, 2010
    Publication date: September 20, 2012
    Inventors: Atsuo Yamada, Shinichi Nishimura, Ryuichi Natsui
  • Publication number: 20110045753
    Abstract: A polishing pad which comprises a laminate of an abrasive layer with a cushioning layer. The abrasive layer has a Microrubber A hardness of 75 degrees or higher and a thickness of 0.8-3.0 mm. The cushioning layer comprises an unfoamed elastomer and has a thickness of 0.05-1.5 mm. The abrasive layer has at least two kinds of grooves formed in the surface. One of the two kinds of grooves is first grooves and the other is second grooves. The first grooves each has a groove width of 0.5-1.2 mm, and has a groove pitch of 7.5-50 mm. The second grooves each has a groove width of 1.5-3 mm, and has a groove pitch of 20-50 mm. Each of the first grooves and each of the second grooves are open to side edge faces of the abrasive layer.
    Type: Application
    Filed: May 13, 2009
    Publication date: February 24, 2011
    Applicant: Toray Industries, Inc.
    Inventors: Kuniyasu Shiro, Miyuki Hanamoto, Kazuhiko Hashisaka, Tsutomu Kobayashi, Atsuo Yamada
  • Publication number: 20100140540
    Abstract: The present invention has features in that a lithium transition metal silicate obtained by sintering a mixture containing a transition metal compound containing at least one transition metal selected from the group consisting of Mn, Fe, Co and Ni; a lithium compound; and a silicon-based polymer compound, is used as a positive electrode material for a secondary battery. The lithium transition metal silicate of the present invention has a high lithium occlusion and release efficiency per unit amount of a transition metal. A secondary battery in which the cost is low, stability and safety are high, and superior charge and discharge characteristics are exhibited can be provided.
    Type: Application
    Filed: March 26, 2008
    Publication date: June 10, 2010
    Inventors: Atsuo Yamada, Shogo Hayase, Yoshiki Fujita, Shinichi Nishimura, Mamoru Tachikawa, Takakazu Hino
  • Patent number: 7217474
    Abstract: A non-aqueous electrolyte secondary battery employing a positive electrode active material containing a compound represented by the general formula LixMyPO4, where 0<x?2 and 0.8?y?1.2, with M containing a 3d transition metal, where LixMyPO4 encompasses that with the grain size not larger than 10 ?m. The non-aqueous electrolyte secondary battery has superior cyclic characteristics and a high capacity.
    Type: Grant
    Filed: April 10, 2006
    Date of Patent: May 15, 2007
    Assignee: Sony Corporation
    Inventors: Atsuo Yamada, Guohua Li, Hideto Azuma
  • Patent number: 7147969
    Abstract: A non-aqueous electrolyte secondary battery employing a positive electrode active material containing a compound represented by the general formula LixMyPO4, where 0<x?2 and 0.8?y?1.2, with M containing a 3d transition metal, where LixMyPO4 encompasses that with the grain size not larger than 10 ?m. The non-aqueous electrolyte secondary battery has superior cyclic characteristics and a high capacity.
    Type: Grant
    Filed: June 30, 2003
    Date of Patent: December 12, 2006
    Assignee: Sony Corporation
    Inventors: Atsuo Yamada, Guohua Li, Hideto Azuma
  • Publication number: 20060188782
    Abstract: A non-aqueous electrolyte secondary battery employing a positive electrode active material containing a compound represented by the general formula LixMyPO4, where 0<x?2 and 0.8?y?1.2, with M containing a 3d transition metal, where LixMyPO4 encompasses that with the grain size not larger than 10 ?m. The non-aqueous electrolyte secondary battery has superior cyclic characteristics and a high capacity.
    Type: Application
    Filed: April 10, 2006
    Publication date: August 24, 2006
    Inventors: Atsuo Yamada, Guohua Li, Hideto Azuma
  • Patent number: 7045240
    Abstract: A power generating apparatus includes a proton conductor unit, containing a fullerene derivative, a hydrogen electrode bonded to one surface of the proton conductor unit, an oxygen electrode bonded to the other surface of the proton conductor unit, and a hydrogen gas supplying unit for supplying a hydrogen gas at a pressure of approximately 0.2 to approximately 3.5 atm to the hydrogen electrode. The present power generating apparatus effectively suppresses transmission of hydrogen and oxygen gases so that it is possible to prevent the hydrogen gas from being emitted to atmosphere due to transmission as well as to prevent the oxygen gas from reaching the hydrogen electrode on transmission to prevent the hydrogen gas from being consumed without contributing to power generation.
    Type: Grant
    Filed: January 9, 2002
    Date of Patent: May 16, 2006
    Assignee: Sony Corporation
    Inventors: Atsuo Yamada, Hisashi Kajiura, Masashi Shiraishi, Ryuichiro Maruyama, Yasuhiro Watanabe, Takahiro Nakamura, Hiroshi Miyazawa
  • Publication number: 20050276748
    Abstract: A method for generating hydrogen gas, an apparatus for producing hydrogen gas, and an energy conversion system, which are so designed as to generate hydrogen extremely efficiently without the help of catalyst are provided. The hydrogen gas is generated by decomposing a metal hydride in a mixture composed of said metal hydride, water, and a second solution which has a pH value lower than that of the aqueous solution of said metal hydride wherein the metal hydride is represented by a formula: ?z(1-x)?zx[BHy], where ? and ? are mutually different elements selected from Groups 1A, 2A, and 2B of the periodic table; and x, y, and z are defined respectively by 0?x?1, 3<y<6, and 0<z<3.
    Type: Application
    Filed: August 22, 2003
    Publication date: December 15, 2005
    Inventors: Hiroyuki Morioka, Atsuo Yamada, Go Sudo, Koji Inomata, Yuichi Tokita
  • Publication number: 20050164878
    Abstract: A hydrogen occluding material which occludes much more hydrogen than conventional alkali metal hydride (such as NaAlH4) through reversible reactions and yet permits hydrogen occlusion and release in one stage at a lower operating temperature, and a method for using said hydrogen occluding material are provided. A hydrogen occluding material which comprises an aluminum hydride represented by the formula (1) below. AlHx ??(1) (where 0?x?3.) A method for using a hydrogen occluding material, said method comprising hydrogenating and/or dehydrogenating at 200° C. or below a hydrogen occluding material composed of an aluminum hydride represented by the formula (1) above.
    Type: Application
    Filed: June 17, 2003
    Publication date: July 28, 2005
    Inventors: Hiroyuki Morioka, Atsuo Yamada, Saicheong Chung
  • Publication number: 20050069480
    Abstract: Reflux systems and methods for purifying carbon nanostructures using same are provided. The reflux system includes a solvent flask, an extraction tube connected to the solvent flask by a siphon tube and a vapor tube each extending between the extraction tube and the solvent flask, and an energy application disposed around the bottom portion of the extraction tube. The reflux systems can be used in a one-step method of purifying carbon nanostructures that includes placing a soot sample that contains the carbon nanostructures and amorphous carbon in a filter and disposing the filter in the extraction tube.
    Type: Application
    Filed: December 7, 2001
    Publication date: March 31, 2005
    Inventors: Houjin Huang, Masashi Shiraishi, Atsuo Yamada, Hisashi Kajiura, Masafumi Ata
  • Patent number: 6855231
    Abstract: Methods and devices for producing fullerene are provided. The present invention includes a pair of electrodes spaced apart to define a region wherein an arc discharge can be conducted between the electrode pair and a gas containing carbon can be supplied to the region such that fullerene can be easily and readily produced.
    Type: Grant
    Filed: April 18, 2001
    Date of Patent: February 15, 2005
    Assignee: Sony Corporation
    Inventors: Hisashi Kajiura, Mitsuaki Miyakoshi, Masashi Shiraishi, Masafumi Ata, Atsuo Yamada
  • Publication number: 20040241079
    Abstract: A substance-occluding material, an electrochemical device employing same and a method of producing same are provided. The substance-occluding material wherein a substance, for example, a fullerene molecule, different from a substance to be occluded, such as hydrogen gas, is contained in the inside of a tubular material, such as carbon nanotube.
    Type: Application
    Filed: March 2, 2004
    Publication date: December 2, 2004
    Inventors: Taishi Takenobu, Masashi Shiraishi, Atsuo Yamada, Hiromichi Kataura