Patents by Inventor Tomoaki Takasaki

Tomoaki Takasaki 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).

  • Patent number: 9620770
    Abstract: Disclosed is a nickel positive electrode for a fiber battery having a long life duration, and also being enabling a high output and high capacity to be attained. For this purpose, the nickel positive electrode for a fiber battery is obtained by coating a carbon fiber with nickel, then causing a cathodic polarization in a nickel nitrate bath using the nickel-coated carbon fiber as a cathode, and then immersing the precipitate, which was deposited on the surface of the carbon fiber by the cathodic polarization, in an aqueous caustic alkali solution.
    Type: Grant
    Filed: November 18, 2009
    Date of Patent: April 11, 2017
    Assignees: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Tomoaki Takasaki, Tetsuo Sakai, Takashi Mukai, Tsutomu Iwaki, Kazuo Tsutsumi, Kazuya Nishimura
  • Patent number: 9350018
    Abstract: A secondary battery includes: a fiber negative electrode having a surface on which a negative electrode active material coating is formed, the coating containing a compound of AaMbXcZd; a fiber positive electrode including a positive electrode active material coating containing nickel hydroxide; an aqueous electrolyte solution; and a separator. The negative electrode coating has an uncoated surface. A is selected from the group consisting of Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, and Ba; M is selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Nb, Mo, Ru, Pd, Ag, Ta, W, Pr, Sm, Eu, and Pb; X is selected from the group consisting of B, Al, Si, P, S, Ga, and Ge; Z is selected from the group consisting of O, S, N, F, Cl, Br, and I; and 0?a?6, 1?b?5, 0?c?4, 0<d?12, and 0?a/b?4.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: May 24, 2016
    Assignees: KAWASAKI JUKOGYO KABUSHIKI KAISHA, NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Kazuo Tsutsumi, Kazuya Nishimura, Tomoaki Takasaki, Tetsuo Sakai, Jinhan Yao, Takashi Mukai
  • Patent number: 9281539
    Abstract: An object of the present invention is to provide a highly efficient electrical storage device that uses a fiber positive electrode and a fiber negative electrode and in which lithium ion is used as an intercalating species, and to provide a method of fabricating the electrical storage device.
    Type: Grant
    Filed: July 13, 2010
    Date of Patent: March 8, 2016
    Assignee: KAWASAKAI JUKOGYO KABUSHIKI KAISHA
    Inventors: Kazuo Tsutsumi, Kazuya Nishimura, Tomoaki Takasaki, Masateru Nakoji, Tetsuo Sakai, Jinhan Yao, Makoto Saito, Takashi Mukai
  • Patent number: 9065139
    Abstract: Provided is a method for mass manufacturing, at low cost, of a fiber positive electrode for a lithium secondary battery, which has excellent charge/discharge cycle characteristics, and which is capable of charging/discharging with high current density, and a main active material of which is a lithium-doped transition metal oxide. The method includes the steps of: (a) forming a tubular coating of either a transition metal oxide or a transition metal hydroxide on a carbon fiber current collector; and (b) performing, in a lithium ion containing solution in a sealed system under presence of an oxidant or a reductant, heat treatment at 100 to 250° C. on the carbon fiber current collector, on which the tubular coating of either the transition metal oxide or the transition metal hydroxide is formed, to obtain a coating of a lithium-doped transition metal oxide on the carbon fiber current collector.
    Type: Grant
    Filed: February 2, 2010
    Date of Patent: June 23, 2015
    Assignees: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Tetsuo Sakai, Jinhan Yao, Takashi Mukai, Tomoaki Takasaki, Kazuo Tsutsumi, Kazuya Nishimura
  • Publication number: 20130273402
    Abstract: A secondary battery includes: a fiber negative electrode having a surface on which a negative electrode active material coating is formed, the coating containing a compound of AaMbXcZd; a fiber positive electrode including a positive electrode active material coating containing nickel hydroxide; an aqueous electrolyte solution; and a separator. The negative electrode coating has an uncoated surface. A is selected from the group consisting of Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, and Ba; M is selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Nb, Mo, Ru, Pd, Ag, Ta, W, Pr, Sm, Eu, and Pb; X is selected from the group consisting of B, Al, Si, P, S, Ga, and Ge; Z is selected from the group consisting of O, S, N, F, Cl, Br, and I; and 0?a?6, 1?b?5, 0?c?4, 0<d?12, and 0?a/b?4.
    Type: Application
    Filed: March 11, 2011
    Publication date: October 17, 2013
    Applicants: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Kazuo Tsutsumi, Kazuya Nishimura, Tomoaki Takasaki, Tetsuo Sakai, Jinhan Yao, Takashi Mukai
  • Publication number: 20120219844
    Abstract: An object of the present invention is to provide a highly efficient electrical storage device that uses a fiber positive electrode and a fiber negative electrode and in which lithium ion is used as an intercalating species, and to provide a method of fabricating the electrical storage device.
    Type: Application
    Filed: July 13, 2010
    Publication date: August 30, 2012
    Applicants: National Institute of Advanced Industrial Science and Technology, Kawasaki Jukogyo Kabushiki Kaisha
    Inventors: Kazuo Tsutsumi, Kazuya Nishimura, Tomoaki Takasaki, Masateru Nakoji, Tetsuo Sakai, Jinhan Yao, Makoto Saito, Takashi Mukai
  • Publication number: 20120214040
    Abstract: The present invention provides a method of efficiently fabricating a large number of fiber electrodes at the same time from a large number of fibers while taking advantage of inherent characteristics of fiber electrodes. A fiber electrode fabrication method according to the present invention includes: a step (2, 2a) of spreading a fiber tow; a step (3, 4, 5) of obtaining fiber positive electrodes or fiber negative electrodes by forming a positive electrode active material coating or a negative electrode active material coating on each of single fibers that are obtained by spreading the fiber tow; and a step (6, 6a) of forming a separator coating on the fiber positive electrodes or the fiber negative electrodes.
    Type: Application
    Filed: July 13, 2010
    Publication date: August 23, 2012
    Applicants: NATIONLA INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Kazuo Tsutsumi, Kazuya Nishimura, Tomoaki Takasaki, Masateru Nakoji, Tetsuo Sakai, Makoto Saito, Jinhan Yao, Takashi Mukai
  • Publication number: 20120040246
    Abstract: Provided is a method for mass manufacturing, at low cost, of a fiber positive electrode for a lithium secondary battery, which has excellent charge/discharge cycle characteristics, and which is capable of charging/discharging with high current density, and a main active material of which is a lithium-doped transition metal oxide. The method includes the steps of: (a) forming a tubular coating of either a transition metal oxide or a transition metal hydroxide on a carbon fiber current collector; and (b) performing, in a lithium ion containing solution in a sealed system under presence of an oxidant or a reductant, heat treatment at 100 to 250° C. on the carbon fiber current collector, on which the tubular coating of either the transition metal oxide or the transition metal hydroxide is formed, to obtain a coating of a lithium-doped transition metal oxide on the carbon fiber current collector.
    Type: Application
    Filed: February 2, 2010
    Publication date: February 16, 2012
    Inventors: Tetsuo Sakai, Jinhan Yao, Takashi Mukai, Tomoaki Takasaki, Kazuo Tsutsumi, Kazuya Nishimura
  • Publication number: 20110287320
    Abstract: Disclosed is a nickel positive electrode for a fiber battery having a long life duration, and also being enabling a high output and high capacity to be attained. For this purpose, the nickel positive electrode for a fiber battery is obtained by coating a carbon fiber with nickel, then causing a cathodic polarization in a nickel nitrate bath using the nickel-coated carbon fiber as a cathode, and then immersing the precipitate, which was deposited on the surface of the carbon fiber by the cathodic polarization, in an aqueous caustic alkali solution.
    Type: Application
    Filed: November 18, 2009
    Publication date: November 24, 2011
    Applicants: KAWASAKI JUKOGYO KABUSHIKI KAISHA, NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Tomoaki Takasaki, Tetsuo Sakai, Takashi Mukai, Tsutomu Iwaki, Kazuo Tsutsumi, Kazuya Nishimura