Patents by Inventor Marie TAKIGUCHI

Marie TAKIGUCHI 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: 20240396005
    Abstract: A positive electrode active material for a lithium secondary battery that can improve the cycle characteristic and discharge rate characteristic of the lithium secondary battery is provided. According to an embodiment of the present invention, the positive electrode active material for the lithium secondary battery has a layered structure, and contains a particle of a lithium metal composite oxide containing Li, Ni, and a specific element X, the particle contains a secondary particle which is an aggregate of primary particles, and containing a phosphorus element on the surface or on the surface and inside of the secondary particle, a value of XPS(P)/XPS(Li) is more than 0 and less than 0.2, a peak is present at 2?=21 to 25° in a powder X-ray diffraction pattern, and an amount of lithium eluted obtained by a neutralization titration method is less than 0.20 wt %.
    Type: Application
    Filed: September 30, 2022
    Publication date: November 28, 2024
    Applicant: SUMITOMO CHEMICAL COMPANY , LIMITED
    Inventors: Marie TAKIGUCHI, Masashi INOUE
  • Publication number: 20240286922
    Abstract: A lithium metal composite oxide contains a secondary particle which is an aggregate of primary particles and a single particle which exists independently of the secondary particle, in which the lithium metal composite oxide has a layered rock-salt structure, is represented by Composition Formula (I), and satisfies (1) and (2) below. (1): 1.2?LA/LB<1.60 (LA is a crystallite diameter obtained from a diffraction peak within the range of 2?=18.8±1° and LB is a crystallite diameter obtained from a diffraction peak within the range of 2?=38.3±1° in a diffraction peak obtained from powder X-ray diffraction using CuK? rays.) (2): a Me occupancy at a lithium site in the layered rock-salt structure is 2.5% or less, as determined by analyzing the diffraction peaks by the Rietveld analysis method, and the Me is Ni, Co, Mn, or X1.
    Type: Application
    Filed: June 14, 2022
    Publication date: August 29, 2024
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Marie TAKIGUCHI, Daisuke NAGAO