Patents by Inventor Kaoru Dokko

Kaoru Dokko 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).

  • Production method for cathode material of lithium sulfur battery, cathode material of lithium sulfur battery, and lithium sulfur battery
    Patent number: 10270090
    Abstract: A production method for a cathode material of a lithium sulfur battery includes, in sequence: a step of preparing a first dispersed solution in which a carbon particle is dispersed in a lithium sulfate solution; a step of adding a solvent in the first dispersed solution, the solvent being a solvent in which lithium sulfate is insoluble; a step of separating a precursor particle from the first dispersed solution in which the solvent is added; and a step of changing the precursor particle into a cathode active material particle by heating the precursor particle under an inert atmosphere.
    Type: Grant
    Filed: October 23, 2015
    Date of Patent: April 23, 2019
    Assignee: NATIONAL UNIVERSITY CORPORATION YOKOHAMA NATIONAL UNIVERSITY
    Inventors: Masayoshi Watanabe, Kaoru Dokko, Zhe Li, Shiguo Zhang
  • Carbon material, fuel cell, and method for producing carbon material
    Patent number: 10211463
    Abstract: A carbon material according to an embodiment contains: 2% by mass or more and 15% by mass or less of nitrogen and 0.3% by mass or more and 2.5% by mass or less of sulfur, and 40% by mass or more of the nitrogen is a graphitic nitrogen.
    Type: Grant
    Filed: August 24, 2015
    Date of Patent: February 19, 2019
    Assignee: NISSHINBO HOLDINGS INC.
    Inventors: Masayoshi Watanabe, Kaoru Dokko, Shiguo Zhang
  • PRODUCTION METHOD FOR CATHODE MATERIAL OF LITHIUM SULFUR BATTERY, CATHODE MATERIAL OF LITHIUM SULFUR BATTERY, AND LITHIUM SULFUR BATTERY
    Publication number: 20170317343
    Abstract: A production method for a cathode material of a lithium sulfur battery includes, in sequence: a step of preparing a first dispersed solution in which a carbon particle is dispersed in a lithium sulfate solution; a step of adding a solvent in the first dispersed solution, the solvent being a solvent in which lithium sulfate is insoluble; a step of separating a precursor particle from the first dispersed solution in which the solvent is added; and a step of changing the precursor particle into a cathode active material particle by heating the precursor particle under an inert atmosphere.
    Type: Application
    Filed: October 23, 2015
    Publication date: November 2, 2017
    Applicant: NATIONAL UNIVERSITY CORPORATION YOKOHAMA NATIONAL UNIVERSITY
    Inventors: Masayoshi WATANABE, Kaoru DOKKO, Zhe LI, Shiguo ZHANG
  • Alkali metal-sulfur-based secondary battery
    Patent number: 9406975
    Abstract: An alkali metal-sulfur-based secondary battery, in which coulombic efficiency is improved by suppressing a side reaction during charge, and a reduction in discharge capacity by repetition of charge and discharge is suppressed and which has a long battery life and an improved input/output density, includes a positive electrode or a negative electrode containing a sulfur-based electrode active material; an electrolyte solution containing an ether compound such as THF and glyme and a solvent such as a fluorine-based solvent, wherein at least a part of the ether compound and the alkali metal salt forms a complex; and a counter electrode.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: August 2, 2016
    Assignee: NATIONAL UNIVERSITY CORPORATION YOKOHAMA NATIONAL UNIVERSITY
    Inventors: Masayoshi Watanabe, Kaoru Dokko, Naoki Tachikawa, Mizuho Tsuchiya, Kazuhide Ueno, Azusa Yamazaki, Kazuki Yoshida, Ryuji Harimoto, Risa Nozawa, Toshihiko Mandai, Ce Zhang, Jun-Woo Park, Yu Onozaki, Masao Iwaya
  • CARBON MATERIAL, FUEL CELL, AND METHOD FOR PRODUCING CARBON MATERIAL
    Publication number: 20150364770
    Abstract: A carbon material according to an embodiment contains: 2% by mass or more and 15% by mass or less of nitrogen and 0.3% by mass or more and 2.5% by mass or less of sulfur, and 40% by mass or more of the nitrogen is a graphitic nitrogen.
    Type: Application
    Filed: August 24, 2015
    Publication date: December 17, 2015
    Applicant: NISSHINBO HOLDINGS INC.
    Inventors: Masayoshi WATANABE, Kaoru DOKKO, Shiguo ZHANG
  • ALKALI METAL-SULFUR-BASED SECONDARY BATTERY
    Publication number: 20150072248
    Abstract: An alkali metal-sulfur-based secondary battery, in which coulombic efficiency is improved by suppressing a side reaction during charge, and a reduction in discharge capacity by repetition of charge and discharge is suppressed and which has a long battery life and an improved input/output density, includes a positive electrode or a negative electrode containing a sulfur-based electrode active material; an electrolyte solution containing an ether compound such as THF and glyme and a solvent such as a fluorine-based solvent, wherein at least a part of the ether compound and the alkali metal salt forms a complex; and a counter electrode.
    Type: Application
    Filed: March 18, 2013
    Publication date: March 12, 2015
    Applicant: NATIONAL UNIVERSITY CORPORATION YOKOHAMA NATIONAL UNIVERSITY
    Inventors: Masayoshi Watanabe, Kaoru Dokko, Naoki Tachikawa, Mizuho Tsuchiya, Kazuhide Ueno, Azusa Yamazaki, Kazuki Yoshida, Ryuji Harimoto, Risa Nozawa, Toshihiko Mandai, Ce Zhang, Jun-Woo Park, Yu Onozaki, Masao Iwaya