Patents by Inventor Nagisa Watanabe

Nagisa Watanabe 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).

  • Publication number: 20220190309
    Abstract: A method for producing an electrode sheet includes heating before pressing to heat the electrode sheet to soften or melt binder particles contained in an electrode mixture layer and roll-pressing the electrode sheet heated in the heating before pressing by use of first and second rolls. In the roll-pressing, the temperature of an outer peripheral surface of a first roll with which an outer surface of the electrode mixture layer of the electrode sheet contacts is set lower than the temperature of an outer peripheral surface of the second roll, and the electrode sheet is roll-pressed so that an adhesive strength of binder particles in the electrode mixture layer to the first roll is reduced lower than an adhesive strength of the binder particles to a current collecting foil.
    Type: Application
    Filed: December 13, 2021
    Publication date: June 16, 2022
    Inventors: Tomoyuki UEZONO, Sokichi OKUBO, Momoka MIYAJIMA, Nagisa SHIMASAKI, Masaki WATANABE, Miyuki MATSUYAMA
  • Patent number: 9997772
    Abstract: Providing a negative-electrode material for nonaqueous-electrolyte secondary battery, the negative-electrode material including lithium silicate particles coated by a carbonaceous substance, a production process for the same, a negative electrode for nonaqueous-electrolyte secondary battery, and a nonaqueous-electrolyte secondary battery. A negative-electrode material for nonaqueous-electrolyte secondary battery includes lithium silicate particles having a surface at least some of which is coated by a carbonaceous substance formed by heating a carbon-containing compound at a thermal decomposition temperature of the carbon-containing compound or more and 1,100±° C. or less, the carbon-containing compound being a solid at ordinary temperature and exhibiting a zeta-potential absolute value being 60 or more against N-methyl-2-pyrrolidone (or NMP).
    Type: Grant
    Filed: August 23, 2013
    Date of Patent: June 12, 2018
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Tomohiro Niimi, Yusuke Sugiyama, Nagisa Watanabe, Kazuhito Kawasumi, Masakazu Murase, Masataka Nakanishi
  • Publication number: 20160233485
    Abstract: A lithium ion secondary cell comprises a negative electrode mixture layer containing 5 to 45% by mass of at least one negative electrode active material selected from the group consisting of hard carbon, soft carbon, Sn, Sn alloys, Si, Si alloys, SiOx (0<x<2), Ge, Ge alloys, carbon nanotubes, and carbon nanofibers, and a positive electrode mixture layer containing a lithium-containing transition metal oxide. The negative electrode mixture layer satisfies (Initial charge capacity per unit mass of the negative electrode mixture layer)/(Initial discharge capacity per unit mass of the negative electrode mixture layer)?1.3.
    Type: Application
    Filed: May 23, 2014
    Publication date: August 11, 2016
    Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Nagisa WATANABE, Junichi NIWA
  • Publication number: 20150188127
    Abstract: Providing a negative-electrode material for nonaqueous-electrolyte secondary battery, the negative-electrode material including lithium silicate particles coated by a carbonaceous substance, a production process for the same, a negative electrode for nonaqueous-electrolyte secondary battery, and a nonaqueous-electrolyte secondary battery. A negative-electrode material for nonaqueous-electrolyte secondary battery includes lithium silicate particles having a surface at least some of which is coated by a carbonaceous substance formed by heating a carbon-containing compound at a thermal decomposition temperature of the carbon-containing compound or more and 1,100° C. or less, the carbon-containing compound being a solid at ordinary temperature and exhibiting a zeta-potential absolute value being 60 or more against N-methyl-2-pyrrolidone (or NMP).
    Type: Application
    Filed: August 23, 2013
    Publication date: July 2, 2015
    Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Tomohiro Niimi, Yusuke Sugiyama, Nagisa Watanabe, Kazuhito Kawasumi, Masakazu Murase, Masataka Nakanishi
  • Publication number: 20150111110
    Abstract: A solid electrolyte has a sheet shape, and is composed of an oxide sintered body. The solid electrolyte includes a layer-shaped dense portion whose sintered density is 90% or more, and a porous portion formed on a superficial side of the solid electrolyte so as to be continuous from at least one of opposite surfaces of the dense portion, and having a porosity of 50% or more. A secondary battery includes a positive electrode, and a negative electrode, the positive electrode and negative electrode arranged at opposite facing positions interposing the solid electrolyte.
    Type: Application
    Filed: April 25, 2013
    Publication date: April 23, 2015
    Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Nagisa Watanabe, Kazuhito Kawasumi, Junichi Niwa, Masataka Nakanishi