Patents by Inventor Yusuke TACHIKAWA

Yusuke TACHIKAWA 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: 12255319
    Abstract: Provided is a positive electrode for a lithium ion secondary battery that suppresses both a decrease in discharge capacity and an increase in internal resistance due to charging and discharging. The positive electrode for the lithium ion secondary battery includes a positive-electrode current collector and a layered structure provided on the positive-electrode current collector, in which the outermost layer of the layered structure contains a first positive-electrode active material represented by Li1+XMAO2 wherein X satisfies ?0.15?X?0.15, MA represents an element group including Ni, Co, and Mn, and the innermost layer of the layered structure contains a second positive-electrode active material represented by Li1+YMBO2 wherein Y satisfies ?0.15?Y?0.15, and MB represents an element group including Ni, Co, and at least one of Mn or Al.
    Type: Grant
    Filed: November 12, 2020
    Date of Patent: March 18, 2025
    Assignee: VEHICLE ENERGY JAPAN INC.
    Inventors: Takeshi Miki, Yuki Takei, Yusuke Tachikawa, Shuichi Suzuki
  • Publication number: 20250038253
    Abstract: A solid electrolyte battery comprises a positive electrode layer, a negative electrode layer and a solid electrolyte layer formed between the positive electrode layer and the negative electrode layer, and which is characterized in that: the negative electrode layer comprises a first negative electrode layer, and a second negative electrode layer that is superposed on the first negative electrode layer so as to be in contact with the solid electrolyte layer; the active material of the first negative electrode layer is a crystalline carbon; the active material of the second negative electrode layer is an amorphous carbon; a negative electrode layer solid electrolyte is mixed into the first negative electrode layer and the second negative electrode layer; and (average particle size (D50) of negative electrode layer solid electrolyte 32)<(average particle size (D50) of crystalline carbon 2)<(average particle size (D50) of amorphous carbon 1) is satisfied.
    Type: Application
    Filed: September 7, 2022
    Publication date: January 30, 2025
    Applicant: Vehicle Energy Japan Inc.
    Inventors: Yuki YAMAMOTO, Yusuke TACHIKAWA
  • Publication number: 20240266536
    Abstract: An object of the present invention is to provide a lithium ion secondary battery having a high power over a wide range of low SOC to high SOC while securing a battery capacity, and having a good storage property (a capacity retention rate). One aspect of the present embodiment includes a lithium ion secondary battery which includes: a positive electrode; and a negative electrode, in which the negative electrode includes a current collector and a negative electrode active material layer disposed on at least one side of the current collector, the negative electrode active material layer includes a negative electrode active material including graphite particles (A) and graphite particles (B) on which amorphous carbon fine particles are supported, and the number of the amorphous carbon fine particles per unit area is 0.4 pieces/?m2 or more in the graphite particles (B) on which the amorphous carbon fine particles are supported.
    Type: Application
    Filed: March 29, 2022
    Publication date: August 8, 2024
    Inventors: Akira INABA, Yusuke TACHIKAWA, Tatsuya TOOYAMA, Yasutaka KUROKI, Takeshi MIKI
  • Publication number: 20230318139
    Abstract: A lithium ion secondary battery can suppress the deterioration of the insulating property of a positive electrode insulating layer by preventing the material of the positive electrode insulating layer from sinking into a positive electrode active material layer. A lithium ion secondary battery according is a lithium ion secondary battery including a positive electrode and a negative electrode that are laminated upon each other. The lithium ion secondary battery is characterized in that the positive electrode includes: a positive electrode foil; a positive electrode active material layer formed on a surface of the positive electrode foil; and a positive electrode insulating layer formed on a surface of the positive electrode active material layer, in which the positive electrode active material layer includes a positive electrode active material and a first nonaqueous binder, and the positive electrode insulating layer includes an inorganic filler, a second nonaqueous binder, and a dispersant.
    Type: Application
    Filed: September 17, 2021
    Publication date: October 5, 2023
    Applicant: Vehicle Energy Japan Inc.
    Inventors: Yusuke TACHIKAWA, Yasutaka KUROKI, Takeshi MIKI
  • Publication number: 20230290931
    Abstract: A lithium ion secondary battery is provided which has a sufficient discharge capacity and has a low internal resistance in a low SOC range. The lithium ion secondary battery includes: a positive electrode including a positive electrode mixture containing a positive electrode active material represented by the following formula: Li1+xMAO2; (where X satisfies ?0.15?X?0.15, MA represents a group of elements including at least one selected from the group consisting of Mn and Al, Ni, and Co.); and a negative electrode including a negative electrode mixture containing a negative electrode active material containing a carbon-based material, a negative electrode additive containing a copper oxide, and a binder, in which the negative electrode mixture contains the copper oxide in an amount of 0.5 wt % or more and 15 wt % or less based on the total weight of the negative electrode active material and the negative electrode additive.
    Type: Application
    Filed: September 21, 2021
    Publication date: September 14, 2023
    Applicant: Vehicle Energy Japan Inc.
    Inventors: Takeshi MIKI, Shuichi SUZUKI, Yusuke TACHIKAWA
  • Publication number: 20220352505
    Abstract: Provided is a positive electrode for a lithium ion secondary battery that suppresses both a decrease in discharge capacity and an increase in internal resistance due to charging and discharging. The positive electrode for the lithium ion secondary battery includes a positive-electrode current collector and a layered structure provided on the positive-electrode current collector, in which the outermost layer of the layered structure contains a first positive-electrode active material represented by Li1+XMAO2 wherein X satisfies ?0.15?X?0.15, MA represents an element group including Ni, Co, and Mn, and the innermost layer of the layered structure contains a second positive-electrode active material represented by Li1+YMBO2 wherein Y satisfies ?0.15?Y?0.15, and MB represents an element group including Ni, Co, and at least one of Mn or Al.
    Type: Application
    Filed: November 12, 2020
    Publication date: November 3, 2022
    Applicant: Vehicle Energy Japan Inc.
    Inventors: Takeshi MIKI, Yuki TAKEI, Yusuke TACHIKAWA, Shuichi SUZUKI