Patents by Inventor Takefumi SUMITOMO

Takefumi SUMITOMO 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).

  • Electrode active material for nonaqueous secondary battery, and method for manufacturing same
    Patent number: 11677068
    Abstract: An electrode active material for a nonaqueous secondary battery comprising: an alkali metal-transition metal composite oxide particles, a hole-doped graphene with an anion. The electrode active material for a nonaqueous secondary battery may be manufactured by a method which includes obtaining a hole-doped graphene by bringing a graphene raw material into contact with a two-coordinate boron cation, and bringing the hole-doped graphene into contact with an alkali metal-transition metal composite oxide particle.
    Type: Grant
    Filed: November 10, 2021
    Date of Patent: June 13, 2023
    Assignees: TOKYO INSTITUTE OF TECHNOLOGY, NICHIA CORPORATION
    Inventors: Takanori Fukushima, Yoshiaki Shoji, Hiroaki Takahashi, Takefumi Sumitomo, Akihiro Tokai
  • METHOD FOR PRODUCING ELECTRODE ACTIVE MATERIAL FOR NON-AQUEOUS SECONDARY BATTERY
    Publication number: 20220102695
    Abstract: Provided is a method for producing an electrode active material capable of forming a non-aqueous secondary battery with superior durability and output characteristics. The method for producing an electrode active material for a non-aqueous secondary battery includes contacting a dispersion containing graphene and a dispersion medium with alkali-metal-transition-metal composite oxide particles, and the dispersion has a dispersibility index of 0.25 or more.
    Type: Application
    Filed: January 30, 2020
    Publication date: March 31, 2022
    Applicant: NICHIA CORPORATION
    Inventors: Takefumi SUMITOMO, Zenji OKABAYASHI, Mari YAMAMOTO, Hiroaki TAKAHASHI, Akihiro TOKAI
  • ELECTRODE ACTIVE MATERIAL FOR NON-AQUEOUS SECONDARY BATTERY AND METHOD FOR PRODUCING THE SAME
    Publication number: 20220093914
    Abstract: Provided is a method for producing an electrode active material capable of forming a non-aqueous secondary battery with superior durability and output characteristics. The method for producing an electrode active material for a non-aqueous secondary battery includes contacting a carbon material containing at least one selected from the group consisting of graphene, a carbon nanotube and carbon black with a one-electron oxidant having an oxidation-reduction potential of 0.2 V or more and 1.9 V or less to obtain at least one modified carbon material, and contacting the at least one modified carbon material with alkali-metal-transition-metal composite oxide particles.
    Type: Application
    Filed: January 30, 2020
    Publication date: March 24, 2022
    Applicant: NICHIA CORPORATION
    Inventors: Takefumi SUMITOMO, Zenji OKABAYASHI, Mari YAMAMOTO, Hiroaki TAKAHASHI, Akihiro TOKAI, Masahito KUMAKURA
  • ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS SECONDARY BATTERY, AND METHOD FOR MANUFACTURING SAME
    Publication number: 20220069288
    Abstract: An electrode active material for a nonaqueous secondary battery comprising: an alkali metal-transition metal composite oxide particles, a hole-doped graphenewith an anion. The electrode active material for a nonaqueous secondary battery may be manufactured by a method which includes obtaining a hole-doped graphene by bringing a graphene raw material into contact with a two-coordinate boron cation, and bringing the hole-doped graphene into contact with an alkali metal-transition metal composite oxide particle.
    Type: Application
    Filed: November 10, 2021
    Publication date: March 3, 2022
    Applicants: TOKYO INSTITUTE OF TECHNOLOGY, NICHIA CORPORATION
    Inventors: Takanori FUKUSHIMA, Yoshiaki SHOJI, Hiroaki TAKAHASHI, Takefumi SUMITOMO, Akihiro TOKAI
  • Electrode active material for nonaqueous secondary battery, and method for manufacturing same
    Patent number: 11201322
    Abstract: An electrode active material for a nonaqueous secondary battery comprising: an alkali metal-transition metal composite oxide particles, a hole-doped graphene with an anion. The electrode active material for a nonaqueous secondary battery may be manufactured by a method which includes obtaining a hole-doped graphene by bringing a graphene raw material into contact with a two-coordinate boron cation, and bringing the hole-doped graphene into contact with an alkali metal-transition metal composite oxide particle.
    Type: Grant
    Filed: July 24, 2018
    Date of Patent: December 14, 2021
    Assignees: TOKYO INSTITUTE OF TECHNOLOGY, NICHIA CORPORATION
    Inventors: Takanori Fukushima, Yoshiaki Shoji, Hiroaki Takahashi, Takefumi Sumitomo, Akihiro Tokai
  • ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS SECONDARY BATTERY, AND METHOD FOR MANUFACTURING SAME
    Publication number: 20200176756
    Abstract: An electrode active material for a nonaqueous secondary battery comprising: an alkali metal-transition metal composite oxide particles, a hole-doped graphene with an anion. The electrode active material for a nonaqueous secondary battery may be manufactured by a method which includes obtaining a hole-doped graphene by bringing a graphene raw material into contact with a two-coordinate boron cation, and bringing the hole-doped graphene into contact with an alkali metal-transition metal composite oxide particle.
    Type: Application
    Filed: July 24, 2018
    Publication date: June 4, 2020
    Applicants: TOKYO INSTITUTE OF TECHNOLOGY, NICHIA CORPORATION
    Inventors: Takanori FUKUSHIMA, Yoshiaki SHOJI, Hiroaki TAKAHASHI, Takefumi SUMITOMO, Akihiro TOKAI