Patents by Inventor Toyomasa NAKANO

Toyomasa NAKANO 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: 20220102706
    Abstract: A positive electrode material for lithium ion secondary batteries is provided, wherein a ratio (A/B) of an oil absorption amount (A) of powder per unit mass of the material, which is measured using N-methyl-2-pyrrolidone, to a void volume (B) of powder per unit mass of the material is 0.30 or more and 0.85 or less, and a ratio (C/D) of a powder density (C) of the material, which is measured in a powder pressure test at a pressure of 4.5 MPa, to an initial powder density (D) of the material is 1.3 or more and 1.7 or less.
    Type: Application
    Filed: March 29, 2021
    Publication date: March 31, 2022
    Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Tsutomu NOZOE, Toyomasa NAKANO
  • Patent number: 11158852
    Abstract: A positive electrode material for lithium-ion secondary batteries, wherein the positive electrode material includes a carbon-coated positive electrode active material which comprises primary particles, secondary particles, and a carbon film, wherein the primary particles and the secondary particles are coated with the carbon film, wherein the primary particles consists of a positive electrode active material in which a strain of the positive electrode active material, which is calculated by X-ray diffraction measurement, is 0.01% or higher and 0.1% or lower, and a ratio (B/A) of a crystallite diameter B (nm) of the positive electrode active material to an average primary particle diameter A (nm) of the carbon-coated positive electrode active material is 0.9 or higher and 1.5 or lower, wherein the particle diameter A is calculated from a specific surface area of the carbon-coated positive electrode active material, wherein the specific surface area is obtained using a BET method.
    Type: Grant
    Filed: September 27, 2019
    Date of Patent: October 26, 2021
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Tsutomu Nozoe, Toyomasa Nakano
  • Publication number: 20210305571
    Abstract: A positive electrode material for a lithium ion secondary battery containing carbon, in which, when a peak of the carbon that is measured by Raman scattering and is present at 2200 to 3400 cm?1 is peak-separated into peaks including five types of Voigt functions of a peak 1 having a peak top present at 2200 to 2380 cm?1, a peak 2 having a peak top present at 2400 to 2550 cm?1, a peak 3 having a peak top present at 2600 to 2750 cm?1, a peak 4 having a peak top present at 2850 to 2950 cm?1, and a peak 5 having a peak top present at 3100 to 3250 cm?1, an average of proportions of Gaussian functions in the peak 3 and the peak 4 is 90% or more and less than 100%.
    Type: Application
    Filed: September 24, 2020
    Publication date: September 30, 2021
    Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Tsutomu NOZOE, Toyomasa NAKANO
  • Publication number: 20210098780
    Abstract: A positive electrode material for a lithium ion secondary battery, including core particles and a carbonaceous film coating a surface of the core particles, in which in a Raman spectrum analysis of the carbonaceous film, in a case where a peak intensity of a spectrum in a wave number band of 1,200 to 1,400 cm?1 is set as D, a minimum intensity of 1,400 to 1,550 cm?1 is set as V, and a peak intensity of the spectrum of 1,550 to 1,700 cm?1 is set as G, an average D/G is 0.77 or more and 0.98 or less and an average V/G is 0.50 or more and 0.66 or less, and each of variation coefficients of D/G and V/G is 2% or less.
    Type: Application
    Filed: March 6, 2020
    Publication date: April 1, 2021
    Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Tsutomu NOZOE, Toyomasa NAKANO
  • Publication number: 20210098781
    Abstract: A positive electrode material for a lithium ion secondary battery, including core particles and a carbonaceous film coating a surface of the core particles, in which in a Raman spectrum analysis of the carbonaceous film, in a case where a peak intensity of a spectrum in a wave number band of 1,200 to 1,400 cm?1 is set as D, a minimum intensity of 1,400 to 1,550 cm?1 is set as V, and a peak intensity of the spectrum of 1,550 to 1,700 cm?1 is set as G, an average D/G is 0.77 or more and 0.98 or less and an average V/G is 0.50 or more and 0.66 or less, and in a case where the average D/G is set as a and the average V/G is set as b, X falls within a range of ?0.1?X?0.1 in Expression X=a?1.47b.
    Type: Application
    Filed: March 9, 2020
    Publication date: April 1, 2021
    Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Tsutomu NOZOE, Toyomasa NAKANO
  • Publication number: 20200313172
    Abstract: A positive electrode material for lithium-ion secondary batteries, wherein the positive electrode material includes a carbon-coated positive electrode active material which comprises primary particles, secondary particles, and a carbon film, wherein the primary particles and the secondary particles are coated with the carbon film, wherein the primary particles consists of a positive electrode active material in which a strain of the positive electrode active material, which is calculated by X-ray diffraction measurement, is 0.01% or higher and 0.1% or lower, and a ratio (B/A) of a crystallite diameter B (nm) of the positive electrode active material to an average primary particle diameter A (nm) of the carbon-coated positive electrode active material is 0.9 or higher and 1.5 or lower, wherein the particle diameter A is calculated from a specific surface area of the carbon-coated positive electrode active material, wherein the specific surface area is obtained using a BET method.
    Type: Application
    Filed: September 27, 2019
    Publication date: October 1, 2020
    Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Tsutomu NOZOE, Toyomasa NAKANO
  • Publication number: 20200251718
    Abstract: A positive electrode material for lithium-ion secondary batteries includes a granulated body in which a volume of pores having a pore size of 2 nm to 100 nm calculated from a cumulative pore volume distribution is 0.1 cm3/g or higher and 0.2 cm3/g or lower and a ratio of a volume of pores having a pore size of 20 nm to 70 nm is 65% or higher with respect to 100% of the volume of pores having a pore size of 2 nm to 100 nm.
    Type: Application
    Filed: September 20, 2019
    Publication date: August 6, 2020
    Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Tsutomu NOZOE, Toyomasa NAKANO