Patents by Inventor Risa NAGAI

Risa NAGAI 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: 11876172
    Abstract: An all-solid battery includes at least a unit cell including a positive electrode, a negative electrode, and an ion-conductive solid electrolyte layer interposed between the positive electrode and the negative electrode. The solid electrolyte layer includes an inorganic solid electrolyte, and a resistance R1 of the unit cell when the pressure applied in a thickness direction of the unit cell is 100 kPa is 90 ?cm2 or less.
    Type: Grant
    Filed: January 23, 2018
    Date of Patent: January 16, 2024
    Assignee: HITACHI ZOSEN CORPORATION
    Inventors: Hidetake Okamoto, Shunji Kinoshita, Risa Nagai
  • Patent number: 11121403
    Abstract: In a production method of an electrode for all-solid-state batteries, the electrode having an electrode mixture layer containing active material particles and solid electrolyte particles, the solid electrolyte particles include a first group of particles having an average particle diameter d1, and a second group of particles having an average particle diameter d2. The production method includes: a first mixing step of dry-mixing the active material particles and the first group of particles, to obtain a mixture A; a second mixing step of dry-mixing the mixture A and the second group of particles, to obtain a mixture B; and a pressing step of pressing the mixture B to form the electrode mixture layer. A ratio of the average particle diameter d2 to the average particle diameter d1:d2/d1 satisfies d2/d1?1.5.
    Type: Grant
    Filed: January 23, 2018
    Date of Patent: September 14, 2021
    Assignee: Hitachi Zosen Corporation
    Inventors: Hirokazu Kawase, Risa Nagai
  • Publication number: 20210119246
    Abstract: In a production method of an electrode for all-solid-state batteries, the electrode having an electrode mixture layer containing active material particles and solid electrolyte particles, the solid electrolyte particles include a first group of particles having an average particle diameter d1, and a second group of particles having an average particle diameter d2. The production method includes: a first mixing step of dry-mixing the active material particles and the first group of particles, to obtain a mixture A; a second mixing step of dry-mixing the mixture A and the second group of particles, to obtain a mixture B; and a pressing step of pressing the mixture B to form the electrode mixture layer. A ratio of the average particle diameter d2 to the average particle diameter d1: d2/d1 satisfies d2/d1?1.5.
    Type: Application
    Filed: January 23, 2018
    Publication date: April 22, 2021
    Inventors: Hirokazu KAWASE, Risa NAGAI
  • Publication number: 20200044283
    Abstract: An all-solid battery includes at least a unit cell including a positive electrode, a negative electrode, and an ion-conductive solid electrolyte layer interposed between the positive electrode and the negative electrode. The solid electrolyte layer includes an inorganic solid electrolyte, and a resistance R1 of the unit cell when the pressure applied in a thickness direction of the unit cell is 100 kPa is 90 ?cm2 or less.
    Type: Application
    Filed: January 23, 2018
    Publication date: February 6, 2020
    Inventors: Hidetake OKAMOTO, Shunji KINOSHITA, Risa NAGAI