Patents by Inventor Kengo TACHIKAWA

Kengo 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: 12199286
    Abstract: The present invention relates to an additive for an electrochemical element positive electrode comprising an activated carbon, wherein the activated carbon has a specific surface area in accordance with BET method of 1300-2500 m2/g, a pore volume of pores having a diameter of 2 nm or more of 0.35 cm3/g or less, a pore volume of pores having a diameter less than 2 nm of 0.5 cm3/g or more, and an ash content of 0.5% by weight or less.
    Type: Grant
    Filed: March 12, 2021
    Date of Patent: January 14, 2025
    Assignee: KURARAY CO., LTD.
    Inventors: Kengo Tachikawa, Mao Takayama, Yoshihisa Inui, Hiroyuki Nishinami, Yumika Nishita, Shushi Nishimura
  • Publication number: 20250006888
    Abstract: The present invention relates to an electrode including at least graphite, a binding agent, and a non-graphitic carbonaceous material, in which, in a half-cell produced with the electrode as a working electrode, Li foil as a counter electrode, and a solution in which lithium hexafluorophosphate is dissolved at a concentration of 1 mol/L in a mixed solution of ethylene carbonate/dimethyl carbonate/ethyl methyl carbonate at a volume ratio of 1/1/1, as an electrolytic solution: (A) a ratio of an area of a region A to an area of a region B (A/B) is 4.0% or more, in which the areas are calculated based on the following reference points in a cyclic voltammogram obtained by doping the electrode with lithium until a cell voltage of 0.01 V is achieved, and then sweeping the cell voltage from +0.01 V to ?0.05 V toward the reduction side and further sweeping the cell voltage to +0.5 V toward the oxidation side at a sweeping rate of 0.
    Type: Application
    Filed: November 15, 2022
    Publication date: January 2, 2025
    Applicant: KURARAY CO., LTD.
    Inventors: Yuki HASENAKA, Kengo TACHIKAWA
  • Patent number: 12080890
    Abstract: The present invention provides a carbonaceous material suitable for a negative electrode active material for non-aqueous electrolyte secondary batteries (e.g., lithium ion secondary batteries, sodium ion secondary batteries, lithium sulfur batteries, lithium air batteries) having high charge/discharge capacities, and preferably high charge/discharge efficiency and low resistance, a negative electrode comprising the carbonaceous material, a non-aqueous electrolyte secondary battery comprising the negative electrode, and a production method of the carbonaceous material. The present invention relates to a carbonaceous material having a nitrogen content obtained by elemental analysis of 3.5 mass % or more, a ratio of nitrogen content and hydrogen content (RN/H) of 6 or more and 100 or less, a ratio of oxygen content and nitrogen content (RO/N) of 0.1 or more and 1.0 or less, and a carbon interplanar spacing (d002) observed by X-ray diffraction measurement of 3.70 ? or more.
    Type: Grant
    Filed: December 8, 2022
    Date of Patent: September 3, 2024
    Assignee: KURARAY CO., LTD.
    Inventors: Takafumi Izawa, Kengo Tachikawa, Hideharu Iwasaki
  • Publication number: 20230261195
    Abstract: The present disclosure provides a binder for electricity storage device electrodes, said binder containing a polyvinyl alcohol resin and an electrolyte solution-swellable resin.
    Type: Application
    Filed: June 15, 2021
    Publication date: August 17, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Kengo Tachikawa, Yoshihisa Inui
  • Publication number: 20230178748
    Abstract: The present invention relates to an additive for an electrochemical element positive electrode comprising an activated carbon, wherein the activated carbon has a specific surface area in accordance with BET method of 1300-2500 m2/g, a pore volume of pores having a diameter of 2 nm or more of 0.35 cm3/g or less, a pore volume of pores having a diameter less than 2 nm of 0.5 cm3/g or more, and an ash content of 0.5% by weight or less.
    Type: Application
    Filed: March 12, 2021
    Publication date: June 8, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Kengo TACHIKAWA, Mao TAKAYAMA, Yoshihisa INUI, Hiroyuki NISHINAMI, Yumika NISHITA, Shushi NISHIMURA
  • Patent number: 11637286
    Abstract: The present invention provides a carbonaceous material suitable for a negative electrode active material for non-aqueous electrolyte secondary batteries (e.g., lithium ion secondary batteries, sodium ion secondary batteries, lithium sulfur batteries, lithium air batteries) having high charge/discharge capacities, and preferably high charge/discharge efficiency and low resistance, a negative electrode comprising the carbonaceous material, a non-aqueous electrolyte secondary battery comprising the negative electrode, and a production method of the carbonaceous material. The present invention relates to a carbonaceous material having a nitrogen content obtained by elemental analysis of 3.5 mass % or more, a ratio of nitrogen content and hydrogen content (RN/H) of 6 or more and 100 or less, a ratio of oxygen content and nitrogen content (RO/N) of 0.1 or more and 1.0 or less, and a carbon interplanar spacing (d002) observed by X-ray diffraction measurement of 3.70 ? or more.
    Type: Grant
    Filed: July 4, 2018
    Date of Patent: April 25, 2023
    Assignee: KURARAY CO., LTD.
    Inventors: Takafumi Izawa, Kengo Tachikawa, Hideharu Iwasaki
  • Publication number: 20230105396
    Abstract: The present invention provides a carbonaceous material suitable for a negative electrode active material for non-aqueous electrolyte secondary batteries (e.g., lithium ion secondary batteries, sodium ion secondary batteries, lithium sulfur batteries, lithium air batteries) having high charge/discharge capacities, and preferably high charge/discharge efficiency and low resistance, a negative electrode comprising the carbonaceous material, a non-aqueous electrolyte secondary battery comprising the negative electrode, and a production method of the carbonaceous material. The present invention relates to a carbonaceous material having a nitrogen content obtained by elemental analysis of 3.5 mass % or more, a ratio of nitrogen content and hydrogen content (RN/H) of 6 or more and 100 or less, a ratio of oxygen content and nitrogen content (RO/N) of 0.1 or more and 1.0 or less, and a carbon interplanar spacing (d002) observed by X-ray diffraction measurement of 3.70 ? or more.
    Type: Application
    Filed: December 8, 2022
    Publication date: April 6, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Takafumi IZAWA, Kengo TACHIKAWA, Hideharu IWASAKI
  • Patent number: 11492260
    Abstract: A problem to be solved by the present invention is to provide a carbonaceous material suitable for a negative electrode active material for non-aqueous electrolyte secondary batteries (e.g., lithium ion secondary batteries, sodium ion secondary batteries, lithium sulfur batteries, lithium air batteries) having high charge/discharge capacities and preferably high charge/discharge efficiency as well as low resistance, a negative electrode comprising the carbonaceous material, a non-aqueous electrolyte secondary battery comprising the negative electrode, and a production method of the carbonaceous material. The present invention relates to a carbonaceous material having a nitrogen element content of 1.0 mass % or more and an oxygen content of 1.5 mass % or less obtained by elemental analysis, a ratio of nitrogen element content and hydrogen element content (RN/H) of 6 or more and 100 or less, a ratio of oxygen element content and nitrogen element content (RO/N) of 0.1 or more and 1.
    Type: Grant
    Filed: July 4, 2018
    Date of Patent: November 8, 2022
    Assignee: KURARAY CO., LTD.
    Inventors: Takafumi Izawa, Kengo Tachikawa, Hideharu Iwasaki
  • Publication number: 20220085375
    Abstract: The present invention relates to a non-aqueous electrolyte cell electrode binder, comprising a water-soluble resin, wherein when the binder is in a state of an aqueous solution with a solid content concentration of 10% by mass, a viscosity at a shear rate of 10 s?1 at 25° C. of the aqueous solution is from 4 Pa·s to 30 Pa·s, and a thixotropic index defined by a viscosity ratio between a viscosity at a shear rate of 10 s?1 and a viscosity at a shear rate of 100 s?1 at 25° C. of the aqueous solution is from 1.8 to 5.
    Type: Application
    Filed: January 8, 2020
    Publication date: March 17, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Kengo TACHIKAWA, Toshimitsu TANAKA, Yoshihisa INUI, Hideharu IWASAKI
  • Publication number: 20210098788
    Abstract: The present invention provides a carbonaceous material suitable for a negative electrode active material for non-aqueous electrolyte secondary batteries (e.g., lithium ion secondary batteries, sodium ion secondary batteries, lithium sulfur batteries, lithium air batteries) having high charge/discharge capacities, and preferably high charge/discharge efficiency and low resistance, a negative electrode comprising the carbonaceous material, a non-aqueous electrolyte secondary battery comprising the negative electrode, and a production method of the carbonaceous material. The present invention relates to a carbonaceous material having a nitrogen content obtained by elemental analysis of 3.5 mass % or more, a ratio of nitrogen content and hydrogen content (RN/H) of 6 or more and 100 or less, a ratio of oxygen content and nitrogen content (RO/N) of 0.1 or more and 1.0 or less, and a carbon interplanar spacing (d002) observed by X-ray diffraction measurement of 3.70 ? or more.
    Type: Application
    Filed: July 4, 2018
    Publication date: April 1, 2021
    Applicant: KURARAYCO., LTD.
    Inventors: Takafumi IZAWA, Kengo TACHIKAWA, Hideharu IWASAKI
  • Publication number: 20210094826
    Abstract: A problem to be solved by the present invention is to provide a carbonaceous material suitable for a negative electrode active material for non-aqueous electrolyte secondary batteries (e.g., lithium ion secondary batteries, sodium ion secondary batteries, lithium sulfur batteries, lithium air batteries) having high charge/discharge capacities and preferably high charge/discharge efficiency as well as low resistance, a negative electrode comprising the carbonaceous material, a non-aqueous electrolyte secondary battery comprising the negative electrode, and a production method of the carbonaceous material. The present invention relates to a carbonaceous material having a nitrogen element content of 1.0 mass % or more and an oxygen content of 1.5 mass % or less obtained by elemental analysis, a ratio of nitrogen element content and hydrogen element content (RN/H) of 6 or more and 100 or less, a ratio of oxygen element content and nitrogen element content (RO/N) of 0.1 or more and 1.
    Type: Application
    Filed: July 4, 2018
    Publication date: April 1, 2021
    Applicant: KURARAY CO., LTD.
    Inventors: Takafumi IZAWA, Kengo TACHIKAWA, Hideharu IWASAKI