Patents by Inventor Akira KOUYAMA

Akira KOUYAMA 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).

  • Nonaqueous electrolyte secondary battery
    Patent number: 10224570
    Abstract: The invention provides a lithium ion secondary battery which exhibits excellent output characteristics and in which decline in the power characteristics is suppressed for a long period of time even after charge-discharge cycling. The lithium ion secondary battery includes a positive electrode, a negative electrode and a nonaqueous electrolyte solution. The positive electrode has a maximum achievable potential of 4.5 V or more versus metallic lithium. The nonaqueous electrolyte solution includes (A) a nonfluorinated cyclic carbonate, (B) a fluorinated cyclic carbonate, and (C) a fluorinated acyclic carbonate. The nonfluorinated cyclic carbonate (A) accounts for more than 10% by volume of (A), (B) and (C) combined.
    Type: Grant
    Filed: March 28, 2014
    Date of Patent: March 5, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takeshi Abe, Toshiyuki Kawai, Akira Kouyama
  • NONAQUEOUS ELECTROLYTE SECONDARY BATTERY
    Publication number: 20160079629
    Abstract: The invention provides a lithium ion secondary battery which exhibits excellent output characteristics and in which decline in the power characteristics is suppressed for a long period of time even after charge-discharge cycling. The lithium ion secondary battery includes a positive electrode, a negative electrode and a nonaqueous electrolyte solution. The positive electrode has a maximum achievable potential of 4.5 V or more versus metallic lithium. The nonaqueous electrolyte solution includes (A) a nonfluorinated cyclic carbonate, (B) a fluorinated cyclic carbonate, and (C) a fluorinated acyclic carbonate. The nonfluorinated cyclic carbonate (A) accounts for more than 10% by volume of (A), (B) and (C) combined.
    Type: Application
    Filed: March 28, 2014
    Publication date: March 17, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takeshi ABE, Toshiyuki KAWAI, Akira KOUYAMA