Patents by Inventor Taketoshi Okuno

Taketoshi Okuno 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: 20230197968
    Abstract: The present invention relates to a carbonaceous material having a pore volume determined by performing Grand Canonical Monte Carlo simulation on an adsorption-desorption isotherm of carbon dioxide of 0.05 cm3/g or more and 0.20 cm3/g or less, and a ratio of desorption amount to adsorption amount (desorption amount/adsorption amount) at a relative pressure of 0.01 in the adsorption-desorption isotherm of 1.05 or more.
    Type: Application
    Filed: April 19, 2021
    Publication date: June 22, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Junichi ARIMA, Akinori YAMABATA, Taketoshi OKUNO, Shinya TAGO
  • Patent number: 11634330
    Abstract: The present invention relates to a carbonaceous material which is derived from a plant, having a specific surface area of 1800 to 3000 m2/g as measured by a BET method, a hydrogen element content of 0.42% by mass or less and an oxygen element content of 1.5% by mass or less.
    Type: Grant
    Filed: February 23, 2018
    Date of Patent: April 25, 2023
    Assignee: KURARAY CO., LTD.
    Inventors: Shohei Kobayashi, Motomi Matsushima, Taketoshi Okuno, Hideharu Iwasaki
  • Publication number: 20230113201
    Abstract: A hardly graphitizable carbonaceous material can be used in a negative electrode material for nonaqueous electrolyte secondary batteries (for example, a lithium ion battery) having not only high charge capacity but also high charge-discharge efficiency and being fully charged to be used and a method for producing the same. Such hardly graphitizable carbonaceous material may have an oxygen element content of 0.25% by mass or less.
    Type: Application
    Filed: December 6, 2022
    Publication date: April 13, 2023
    Applicant: KURARAY CO., LTD.
    Inventors: Junji FUJIOKA, Jun-Sang CHO, Taketoshi OKUNO, Hideharu IWASAKI
  • Publication number: 20220371893
    Abstract: An object of the present invention is to provide a carbonaceous material suitable as an electrode material of an electrochemical device which is increased in capacity with not only suppression of an increase in irreversible capacity, but also securement of a high electrode density, as well as a method for producing the carbonaceous material The present invention relates to a carbonaceous material for an electrochemical device, having a specific surface area of 23 m2/g or less as measured according to a BET method and an aerated energy (AE) of 40 mJ or more and 210 mJ or less as measured with a powder rheometer.
    Type: Application
    Filed: October 6, 2020
    Publication date: November 24, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Junichi ARIMA, Yasuyuki HIROTA, Akinori YAMABATA, Taketoshi OKUNO
  • Patent number: 11355755
    Abstract: A carbonaceous material for a non-aqueous electrolyte secondary battery, having an average interplanar spacing d002 of the (002) plane within a range of 0.36 to 0.42 nm calculated by using the Bragg equation according to a wide-angle X-ray diffraction method, a specific surface area within a range of 8 to 30 m2/g obtained by a nitrogen adsorption BET three-point method, a nitrogen element content of 0.5 mass % or less, an oxygen element content of 0.3 mass % or less, and an average particle diameter of 1 to 2.8 ?m according to a laser scattering method.
    Type: Grant
    Filed: October 27, 2016
    Date of Patent: June 7, 2022
    Assignee: KURARAY CO., LTD.
    Inventors: Tomohiro Kawakami, Takafumi Izawa, Taketoshi Okuno, Jun-Sang Cho, Hideharu Iwasaki
  • Patent number: 11345601
    Abstract: The present invention relates to a carbonaceous material that is suitable for the negative pole active substance of a nonaqueous electrolyte secondary battery, a negative pole for a nonaqueous electrolyte secondary battery comprising the carbonaceous material, a nonaqueous electrolyte secondary battery having the negative pole, and a method for producing the carbonaceous material. This carbonaceous material is for a negative pole active substance of a nonaqueous electrolyte secondary battery. The carbonaceous material is derived from plants, the half-width of the peak at approximately 1360 cm-1 of the Raman spectrum observed by laser Raman spectroscopy is 190 to 240 cm-1, and the specific surface area as found by multipoint BET analysis of nitrogen adsorption is 10 to 100 m2/g.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: May 31, 2022
    Assignee: KURARAY CO., LTD.
    Inventors: Takafumi Izawa, Keiichi Nishimura, Taketoshi Okuno, Hideharu Iwasaki
  • Publication number: 20220069305
    Abstract: The present invention relates to a carbonaceous material for an electrochemical device, having an average particle size D50 of 30 ?m or larger as measured by a laser scattering method, and a basic flowability energy BFE of 270 mJ to 1,100 mJ as measured using a powder flowability analyzer equipped with a measuring vessel of 50 mm in diameter and 160 mL in volume under the conditions of a blade tip speed of 100 mm/sec and a powder sample filling capacity of 120 mL and calculated by the following formula: BFE=T/(R tan ?)+F (wherein, R=48 mm, ?=5°, T represents a numerical value of the rotational torque measured by the analyzer, and F represents a numerical value of the normal stress measured by the analyzer).
    Type: Application
    Filed: December 25, 2019
    Publication date: March 3, 2022
    Applicant: KURARAY CO., LTD.
    Inventors: Junichi ARIMA, Yasuyuki HIROTA, Akinori YAMABATA, Taketoshi OKUNO
  • Patent number: 10984963
    Abstract: The present invention relates to a carbonaceous material having a specific surface area of 1,800 m2/g to 3,000 m2/g according to a BET method, an R-value of 1.2 or more and a G-band half-value width of 70 cm?1 or more according to a Raman spectrum.
    Type: Grant
    Filed: February 23, 2018
    Date of Patent: April 20, 2021
    Assignee: KURARAYCO., LTD.
    Inventors: Shohei Kobayashi, Motomi Matsushima, Taketoshi Okuno, Hideharu Iwasaki
  • Patent number: 10734650
    Abstract: Provided is a carbonaceous material used in a negative electrode of a non-aqueous electrolyte secondary battery that shows favorable charge/discharge capacities and low resistance and having favorable resistance to oxidative degradation. The carbonaceous material has an average interplanar spacing d002 of the (002) plane of 0.36 to 0.42 nm calculated by using the Bragg equation according to a wide-angle X-ray diffraction method, a specific surface area of 20 to 65 m2/g obtained by a nitrogen adsorption BET three-point method, a nitrogen element content of 0.3 mass % or less, an oxygen element content of 2.5 mass % or less, and an average particle diameter of 1 to 4 ?m according to a laser scattering method.
    Type: Grant
    Filed: October 27, 2016
    Date of Patent: August 4, 2020
    Assignee: KURARAY CO., LTD.
    Inventors: Tomohiro Kawakami, Sayaka Ide, Takafumi Izawa, Taketoshi Okuno, Jun-Sang Cho, Hideharu Iwasaki
  • Publication number: 20190375641
    Abstract: The present invention relates to a carbonaceous material which is derived from a plant, having a specific surface area of 1800 to 3000 m2/g as measured by a BET method, a hydrogen element content of 0.42% by mass or less and an oxygen element content of 1.5% by mass or less.
    Type: Application
    Filed: February 23, 2018
    Publication date: December 12, 2019
    Applicant: KURARAY CO., LTD.
    Inventors: Shohei KOBAYASHI, Motomi MATSUSHIMA, Taketoshi OKUNO, Hideharu IWASAKI
  • Publication number: 20190378662
    Abstract: The present invention relates to a carbonaceous material having a specific surface area of 1,800 m2/g to 3,000 m2/g according to a BET method, an R-value of 1.2 or more and a G-band half-value width of 70 cm?1 or more according to a Raman spectrum.
    Type: Application
    Filed: February 23, 2018
    Publication date: December 12, 2019
    Applicant: KURARAY CO., LTD.
    Inventors: Shohei KOBAYASHI, Motomi MATSUSHIMA, Taketoshi OKUNO, Hideharu IWASAKI
  • Patent number: 10472239
    Abstract: The present invention relates to a carbonaceous material derived from a plant starting material, which is useful for electronic materials for conductive materials, capacitor electrodes, storage battery electrodes, nonaqueous electrolyte secondary battery electrodes and the like. The present invention relates to a carbonaceous material for electronic materials, which is obtained by burning a carbon precursor derived from palm husk, and which is configured such that: the potassium content in the carbonaceous material is 100 ppm or less; the calcium content in the carbonaceous material is 100 ppm or less; and the elemental oxygen content in the carbonaceous material is 0.25% by weight or less.
    Type: Grant
    Filed: June 9, 2016
    Date of Patent: November 12, 2019
    Assignee: KURARAY CO., LTD.
    Inventors: Kyomi Tajima, Hidetoshi Kudo, Taketoshi Okuno, Hideharu Iwasaki
  • Patent number: 10381637
    Abstract: Provided is a less hygroscopic carbonaceous material that is obtained from a plant-derived carbonaceous raw material and that, when used as a negative electrode material for a nonaqueous electrolyte secondary battery, allows the battery to exhibit good battery characteristics. Provided is a carbonaceous material for negative electrodes of nonaqueous electrolyte secondary batteries. This carbonaceous material is a particulate carbonaceous material containing carbonaceous particles. The carbonaceous material has a BET specific surface area of 1 m2/g or more and less than 20 m2/g. Each of the carbonaceous particles of the carbonaceous material has a core and a skin covering the core. The core contains a calcined product of a plant-derived carbonaceous raw material. The skin is made of a material that has higher electron emission ability upon irradiation with an electron beam than a material of the core.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: August 13, 2019
    Assignee: KURARAY CO., LTD.
    Inventors: Akira Koshima, Taketoshi Okuno, Kenichi Koyakumaru, Hideharu Iwasaki, Kenta Aoki, Makoto Imaji, Yasuhiro Tada, Naohiro Sonobe
  • Publication number: 20190194024
    Abstract: The present invention relates to a carbonaceous material that is suitable for the negative pole active substance of a nonaqueous electrolyte secondary battery, a negative pole for a nonaqueous electrolyte secondary battery comprising the carbonaceous material, a nonaqueous electrolyte secondary battery having the negative pole, and a method for producing the carbonaceous material. This carbonaceous material is for a negative pole active substance of a nonaqueous electrolyte secondary battery. The carbonaceous material is derived from plants, the half-width of the peak at approximately 1360 cm-1 of the Raman spectrum observed by laser Raman spectroscopy is 190 to 240 cm-1, and the specific surface area as found by multipoint BET analysis of nitrogen adsorption is 10 to 100 m2/g.
    Type: Application
    Filed: August 2, 2017
    Publication date: June 27, 2019
    Applicant: KURARAY CO., LTD.
    Inventors: Takafumi IZAWA, Keiichi NISHIMURA, Taketoshi OKUNO, Hideharu IWASAKI
  • Publication number: 20180323433
    Abstract: An object of the present invention is to provide a carbonaceous material (carbonaceous material for a non-aqueous electrolyte secondary battery) used for a negative electrode of a non-aqueous electrolyte secondary battery (e.g., a lithium ion secondary battery) exhibiting favorable charge/discharge capacities and low resistance and having favorable resistance to oxidative degradation. The present invention relates to a carbonaceous material for a non-aqueous electrolyte secondary battery, having an average interplanar spacing d002 of the (002) plane within a range of 0.36 to 0.42 nm calculated by using the Bragg equation according to a wide-angle X-ray diffraction method, a specific surface area within a range of 20 to 65 m2/g obtained by a nitrogen adsorption BET three-point method, a nitrogen element content of 0.3 mass % or less, an oxygen element content of 2.5 mass % or less, and an average particle diameter of 1 to 4 ?m according to a laser scattering method.
    Type: Application
    Filed: October 27, 2016
    Publication date: November 8, 2018
    Applicants: KURARAY CO., LTD., KUREHA CORPORATION
    Inventors: Tomohiro KAWAKAMI, Sayaka IDE, Takafumi IZAWA, Taketoshi OKUNO, Jun-Sang CHO, Hideharu IWASAKI
  • Publication number: 20180309126
    Abstract: An object of the present invention is to provide a carbonaceous material (carbonaceous material for a non-aqueous electrolyte secondary battery) used for a negative electrode of a non-aqueous electrolyte secondary battery (e.g., a lithium ion secondary battery) exhibiting favorable charge/discharge capacities and low resistance and having favorable resistance to oxidative degradation. The present invention relates to a carbonaceous material for a non-aqueous electrolyte secondary battery, having an average interplanar spacing d002 of the (002) plane within a range of 0.36 to 0.42 nm calculated by using the Bragg equation according to a wide-angle X-ray diffraction method, a specific surface area within a range of 8 to 30 m2/g obtained by a nitrogen adsorption BET three-point method, a nitrogen element content of 0.5 mass % or less, an oxygen element content of 0.3 mass % or less, and an average particle diameter of 1 to 4 ?m according to a laser scattering method.
    Type: Application
    Filed: October 27, 2016
    Publication date: October 25, 2018
    Applicants: KURARAY CO., LTD., KUREHA CORPORATION
    Inventors: Tomohiro KAWAKAMI, Takafumi IZAWA, Taketoshi OKUNO, Jun-Sang CHO, Hideharu IWASAKI
  • Publication number: 20180233749
    Abstract: To provide a hardly graphitizable carbonaceous material used in a negative electrode material for nonaqueous electrolyte secondary batteries (for example, a lithium ion battery) having not only high charge capacity but also high charge-discharge efficiency and being fully charged to be used and a method for producing the same. To provide a negative electrode material for nonaqueous electrolyte secondary batteries comprising such a hardly graphitizable carbonaceous material, and a nonaqueous electrolyte secondary battery comprising such a negative electrode material for nonaqueous electrolyte secondary batteries and being fully charged to be used. A hardly graphitizable carbonaceous material, being a hardly graphitizable carbonaceous material for nonaqueous electrolyte secondary batteries fully charged to be used and having an oxygen element content of 0.25% by mass or less.
    Type: Application
    Filed: July 20, 2016
    Publication date: August 16, 2018
    Applicants: KURARAY CO., LTD., KUREHA CORPORATION
    Inventors: Junji FUJIOKA, Jun-Sang CHO, Taketoshi OKUNO, Hideharu IWASAKI
  • Publication number: 20180162733
    Abstract: The present invention relates to a carbonaceous material derived from a plant starting material, which is useful for electronic materials for conductive materials, capacitor electrodes, storage battery electrodes, nonaqueous electrolyte secondary battery electrodes and the like. The present invention relates to a carbonaceous material for electronic materials, which is obtained by burning a carbon precursor derived from palm husk, and which is configured such that: the potassium content in the carbonaceous material is 100 ppm or less; the calcium content in the carbonaceous material is 100 ppm or less; and the elemental oxygen content in the carbonaceous material is 0.25% by weight or less.
    Type: Application
    Filed: June 9, 2016
    Publication date: June 14, 2018
    Applicant: KURARAY CO., LTD.
    Inventors: Kyomi TAJIMA, Hidetoshi KUDO, Taketoshi OKUNO, Hideharu IWASAKI
  • Publication number: 20160268590
    Abstract: Provided is a less hygroscopic carbonaceous material that is obtained from a plant-derived carbonaceous raw material and that, when used as a negative electrode material for a nonaqueous electrolyte secondary battery, allows the battery to exhibit good battery characteristics. Provided is a carbonaceous material for negative electrodes of nonaqueous electrolyte secondary batteries. This carbonaceous material is a particulate carbonaceous material containing carbonaceous particles. The carbonaceous material has a BET specific surface area of 1 m2/g or more and less than 20 m2/g. Each of the carbonaceous particles of the carbonaceous material has a core and a skin covering the core. The core contains a calcined product of a plant-derived carbonaceous raw material. The skin is made of a material that has higher electron emission ability upon irradiation with an electron beam than a material of the core.
    Type: Application
    Filed: October 10, 2014
    Publication date: September 15, 2016
    Applicants: KURARAY CO., LTD., KURARAY CHEMICAL CO., LTD., KUREHA CORPORATION
    Inventors: Akira KOSHIMA, Taketoshi OKUNO, Kenichi KOYAKUMARU, Hideharu IWASAKI, Kenta AOKI, Makoto IMAJI, Yasuhiro TADA, Naohiro SONOBE
  • Patent number: 8477480
    Abstract: Laminates including a nanofiber layer and a base layer, the nanofiber layer comprising polyamide filaments formed from a polyamide (a) and having an average fiber diameter of 10 to 1000 nm, and the base layer comprising fibers at least including polyamide fibers formed from a polyamide (a), where the polyamide (a) comprises a dicarboxylic acid unit and a diamine unit and where (i) the dicarboxylic acid unit comprising a terephthalic acid unit in the proportion of not lower than 60% by mole, and (ii) the diamine unit comprising at least one diamine unit selected from the group consisting of 1,9-nonanediamine unit and 2-methyl-1,8-octanediamine unit in the proportion of not lower than 60% by mole in total are provided, as well as separators for capacitors including the laminates.
    Type: Grant
    Filed: April 14, 2010
    Date of Patent: July 2, 2013
    Assignee: Kuraray Co., Ltd.
    Inventors: Tomohiro Hayakawa, Hideo Hayashi, Taketoshi Okuno, Nozomu Sugoh, Hideki Kamada, Hiroyuki Kawai, Shinya Inada