Patents by Inventor Yasuhiro Tada

Yasuhiro Tada 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: 11322744
    Abstract: To provide an electrode mixture that suppresses gelling of an electrode mixture slurry and maintains a high binding capacity between an electrode active material and a current collector even after an extended period of time has elapsed since an electrode mixture slurry was produced. The electrode mixture includes: a binder composition—containing a first copolymer of vinylidene fluoride and a polar group-containing compound; and a second copolymer of vinylidene fluoride and chlorotrifluoroethylene—; and an electrode active material of lithium oxide having a pH of water when extracted with water of not less than 10.5.
    Type: Grant
    Filed: November 9, 2017
    Date of Patent: May 3, 2022
    Assignee: KUREHA CORPORATION
    Inventors: Kenta Aoki, Shoko Aoki, Shota Kobayashi, Yasuhiro Tada
  • Publication number: 20210376321
    Abstract: The purpose of the present invention is to provide a sodium ion secondary battery that has high discharge capacity, excellent cycling characteristics, and excellent storage characteristics. The present invention achieves said purpose by means of a carbonaceous material for a sodium ion secondary battery negative electrode. The carbon source of the carbonaceous material is a plant, and the carbonaceous material is characterized by having a BET specific surface area of 100 m2/g or less.
    Type: Application
    Filed: August 11, 2021
    Publication date: December 2, 2021
    Applicant: KURARAY CO., LTD.
    Inventors: Shota KOBAYASHI, Tetsuhiro KOBAYASHI, Yasuhiro TADA
  • Patent number: 10573891
    Abstract: The object of the present invention is to provide a carbonaceous material which is obtainable from plant-derived char and has a decreased specific surface area. Further, the object of the present invention is to provide a non-aqueous electrolyte secondary battery having excellent dedoping capacity, non-dedoping capacity, and charge-discharge efficiency. The object can be solved by a carbonaceous material for non-aqueous electrolyte secondary batteries characterized in that the carbonaceous material is obtained by heat-treating plant-derived char which is demineralized in gas-phase, and carbon precursor or volatile organic compound under a non-oxidizing gas atmosphere; and a specific surface area determined by a BET method is 10 m2/g or less.
    Type: Grant
    Filed: January 18, 2017
    Date of Patent: February 25, 2020
    Assignee: KURARAY CO., LTD.
    Inventors: Makoto Imaji, Kenta Aoki, Yasuhiro Tada, Naohiro Sonobe, Junichi Arima, Kenichi Koyakumaru, Hideharu Iwasaki, Kiyoto Otsuka, Jiro Masuko, Hajime Komatsu, Shinya Tago
  • Patent number: 10504635
    Abstract: An object of the present invention is to provide a carbonaceous material for a negative electrode for producing a nonaqueous electrolyte secondary battery capable of rapid charge and discharge and having excellent rate characteristics (output characteristics) while maintaining a large discharge capacity. The problem described above can be solved by a carbonaceous material for a nonaqueous electrolyte secondary battery negative electrode of the present invention obtained by heat-treating a non-graphitizable carbon precursor which is pulverized and contains from 13 to 80 wt. % of a volatile component. With the present invention, it is possible to provide a carbonaceous material for a nonaqueous electrolyte secondary battery negative electrode, whereby a nonaqueous electrolyte secondary battery having a large charge-discharge capacity and having excellent rate characteristics can be produced.
    Type: Grant
    Filed: February 19, 2014
    Date of Patent: December 10, 2019
    Assignee: KURARAY CO., LTD.
    Inventors: Makoto Imaji, Yasuhiro Tada, Naohiro Sonobe
  • Publication number: 20190326602
    Abstract: To provide an electrode mixture that suppresses gelling of an electrode mixture slurry and maintains a high binding capacity between an electrode active material and a current collector even after an extended period of time has elapsed since an electrode mixture slurry was produced. The electrode mixture includes: a binder composition—containing a first copolymer of vinylidene fluoride and a polar group-containing compound; and a second copolymer of vinylidene fluoride and chlorotrifluoroethylene—; and an electrode active material of lithium oxide having a pH of water when extracted with water of not less than 10.5.
    Type: Application
    Filed: November 9, 2017
    Publication date: October 24, 2019
    Applicant: Kureha Corporation
    Inventors: Kenta AOKI, Shoko AOKI, Shota KOBAYASHI, Yasuhiro TADA
  • 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: 20180287153
    Abstract: The purpose of the present invention is to provide a sodium ion secondary battery that has high discharge capacity, excellent cycling characteristics, and excellent storage characteristics. The present invention achieves said purpose by means of a carbonaceous material for a sodium ion secondary battery negative electrode. The carbon source of the carbonaceous material is a plant, and the carbonaceous material is characterized by having a BET specific surface area of 100 m2/g or less.
    Type: Application
    Filed: September 21, 2016
    Publication date: October 4, 2018
    Applicant: KURARAY CO., LTD.
    Inventors: Shota KOBAYASHI, Tetsuhiro KOBAYASHI, Yasuhiro TADA
  • Publication number: 20180269484
    Abstract: To provide a binder composition having high adhesion, without producing a copolymer or an aggregate of a copolymer and an electrode active material. A binder composition according to the present invention contains: a first vinylidene fluoride polymer with an inherent viscosity of 1.7 dL/g or higher; and a second vinylidene fluoride polymer containing acrylic acid or methacrylic acid as a monomer unit.
    Type: Application
    Filed: September 13, 2016
    Publication date: September 20, 2018
    Inventors: SHOTA KOBAYASHI, KENTA AOKI, HIROSHI SATO, YASUHIRO TADA
  • Publication number: 20180261875
    Abstract: An object of the present invention is to provide a non-aqueous electrolyte secondary battery having high discharge capacity and high charge/discharge efficiency. The aforementioned problem can be resolved by a carbonaceous material for a non-aqueous electrolyte secondary battery negative electrode, using a plant as a carbon source, where potassium element content is 0.10 wt. % or less, true density determined by a pycnometer method using butanol is from 1.35 to 1.50 g/cm3, lithium is electrochemically doped in the carbonaceous material, and in a case where an NMR spectrum of lithium nucleus is measured, a main resonance peak shifted 110 to 160 ppm to a lower magnetic field side is exhibited with regard to a resonance peak of LiCl as a reference substance.
    Type: Application
    Filed: September 21, 2016
    Publication date: September 13, 2018
    Inventors: MAKOTO IMAJI, TATSUYA YAGUCHI, SHOTA KOBAYASHI, YASUHIRO TADA
  • Patent number: 9991517
    Abstract: Provided is a carbonaceous material for a non-aqueous electrolyte secondary battery anode having high discharge capacity per unit volume and excellent storage characteristics. The carbonaceous material for a non-aqueous electrolyte secondary battery anode of the present invention has a true density (?Bt) determined by a pycnometer method using butanol of not less than 1.55 g/cm3 and less than 1.75 g/cm3 and a discharge capacity of an anode at 0.05 V to 1.5 V in terms of a lithium reference electrode standard of not less than 180 mAh/g. Furthermore, the slope 0.9/X (Vg/Ah) of a discharge curve calculated from a discharge capacity X (Ah/g) and a potential difference of 0.9 (V) corresponding to 0.2 V to 1.1 V in terms of a lithium reference electrode standard is not greater than 0.75 (Vg/Ah), and an absorbed moisture quantity after storage for 100 hours in a 25° C. 50% RH air atmosphere is not greater than 1.5 wt %.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: June 5, 2018
    Assignee: KUREHA CORPORATION
    Inventors: Makoto Imaji, Kayoko Okada, Yasuhiro Tada, Naohiro Sonobe, Mayu Komatsu
  • Patent number: 9947927
    Abstract: An object of the present invention is to provide a production method for suppressing the deformation of a negative electrode in the production of a negative electrode for an all-solid-state battery using turbostratic carbon and a solid electrolyte. The problem described above can be solved by a production method for a negative electrode for an all-solid-state battery comprising the steps of: (1) coating a carbonaceous material having a true density of from 1.30 g/cm3 to 2.10 g/cm3 determined by a butanol method with a solid electrolyte; and (2) pressure-molding the solid electrolyte-coated carbonaceous material.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: April 17, 2018
    Assignee: KUREHA CORPORATION
    Inventors: Kenta Aoki, Shota Kobayashi, Tatsuya Yaguchi, Hiroshi Imoto, Yasuhiro Tada, Naohiro Sonobe
  • Publication number: 20180083282
    Abstract: An object of the present invention is to provide a carbonaceous molded body for a battery electrode having high charge/discharge capacity, high initial charge/discharge efficiency, and excellent cycle life. The aforementioned object can be achieved by a carbonaceous molded body for a battery electrode of the present invention, including: carbon fibers where lithium can be doped and dedoped; and a carbonaceous material; wherein the thickness is 1 mm or less, atomic ratio (H/C) between hydrogen atoms and carbon atoms based on elemental analysis is 0.1 or less, porosity determined from bulk density of the molded body and true density of butanol is from 25 to 80%, and volatile matter content is 5.0 wt. % or less.
    Type: Application
    Filed: March 28, 2016
    Publication date: March 22, 2018
    Inventors: Takanori BABA, Choi YOUNG-KUK, Shota KOBAYASHI, Yasuhiro TADA
  • Patent number: 9812711
    Abstract: To provide a carbonaceous material for a non-aqueous electrolyte secondary battery anode that yields an anode for a non-aqueous electrolyte secondary battery having excellent input/output characteristics, and a non-aqueous electrolyte secondary battery having high discharge capacity per unit volume, and a non-aqueous electrolyte secondary battery and a vehicle comprising this non-aqueous electrolyte secondary battery anode. The carbonaceous material for a non-aqueous electrolyte secondary battery anode of the present invention has a number average particle size of from 0.1 to 2.0 ?m, a value of a number average particle size divided by a volume average particle size of not greater than 0.3, an average interlayer spacing d002 of an (002) plane determined by X-ray diffraction of from 0.340 to 0.390 nm, and an atomic ratio (H/C) of hydrogen and carbon of not greater than 0.10.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: November 7, 2017
    Assignee: KUREHA CORPORATION
    Inventors: Makoto Imaji, Kayoko Okada, Yasuhiro Tada, Naohiro Sonobe, Mayu Komatsu
  • Publication number: 20170162874
    Abstract: A carbonaceous material for a negative electrode of a non-aqueous electrolyte secondary battery with high energy density relative to volume and excellent cycle characteristics is provided. The negative electrode material for a non-aqueous electrolyte secondary battery of the present invention includes a carbon material mixture including, as an active material, a plurality of non-graphitic carbon materials. The carbon material mixture has a true density (?Bt) determined by a pycnometer method using butanol of 1.60 g/cm3 or greater and 2.05 g/cm3 or less, an atom ratio (H/C) of hydrogen atoms to carbon atoms determined by elemental analysis of 0.10 or less, and a discharge capacity at from 0 to 0.1 V based on a lithium reference electrode of 80 mAh/g or greater and 230 mAh/g or less.
    Type: Application
    Filed: March 27, 2015
    Publication date: June 8, 2017
    Inventors: Shota KOBAYASHI, Yasufumi IKEYAMA, Yasuhiro TADA, Naohiro SONOBE, Mayu KOMATSU
  • Publication number: 20170149062
    Abstract: To provide a carbonaceous material for a non-aqueous electrolyte secondary battery anode that yields an anode for a non-aqueous electrolyte secondary battery having excellent input/output characteristics, and a non-aqueous electrolyte secondary battery having high discharge capacity per unit volume, and a non-aqueous electrolyte secondary battery and a vehicle comprising this non-aqueous electrolyte secondary battery anode. The carbonaceous material for a non-aqueous electrolyte secondary battery anode of the present invention has a number average particle size of from 0.1 to 2.0 ?m, a value of a number average particle size divided by a volume average particle size of not greater than 0.3, an average interlayer spacing d002 of an (002) plane determined by X-ray diffraction of from 0.340 to 0.390 nm, and an atomic ratio (H/C) of hydrogen and carbon of not greater than 0.10.
    Type: Application
    Filed: March 27, 2015
    Publication date: May 25, 2017
    Applicant: KUREHA CORPORATION
    Inventors: MAKOTO IMAJI, KAYOKO OKADA, YASUHIRO TADA, NAOHIRO SONOBE, MAYU KOMATSU
  • Publication number: 20170141395
    Abstract: An object of the present invention is to provide a production method for suppressing the deformation of a negative electrode in the production of a negative electrode for an all-solid-state battery using turbostratic carbon and a solid electrolyte. The problem described above can be solved by a production method for a negative electrode for an all-solid-state battery comprising the steps of: (1) coating a carbonaceous material having a true density of from 1.30 g/cm3 to 2.10 g/cm3 determined by a butanol method with a solid electrolyte; and (2) pressure-molding the solid electrolyte-coated carbonaceous material.
    Type: Application
    Filed: March 31, 2015
    Publication date: May 18, 2017
    Inventors: KENTA AOKI, SHOTA KOBAYASHI, TATSUYA YAGUCHI, HIROSHI IMOTO, YASUHIRO TADA, NAOHIRO SONOBE
  • Publication number: 20170141394
    Abstract: Provided is a carbonaceous material for a non-aqueous electrolyte secondary battery anode having high discharge capacity per unit volume and excellent storage characteristics. The carbonaceous material for a non-aqueous electrolyte secondary battery anode of the present invention has a true density (?Bt) determined by a pycnometer method using butanol of not less than 1.55 g/cm3 and less than 1.75 g/cm3 and a discharge capacity of an anode at 0.05 V to 1.5 V in terms of a lithium reference electrode standard of not less than 180 mAh/g. Furthermore, the slope 0.9/X (Vg/Ah) of a discharge curve calculated from a discharge capacity X (Ah/g) and a potential difference of 0.9 (V) corresponding to 0.2 V to 1.1 V in terms of a lithium reference electrode standard is not greater than 0.75 (Vg/Ah), and an absorbed moisture quantity after storage for 100 hours in a 25° C. 50% RH air atmosphere is not greater than 1.5 wt %.
    Type: Application
    Filed: March 27, 2015
    Publication date: May 18, 2017
    Inventors: Makoto IMAJI, Kayoko OKADA, Yasuhiro TADA, Naohiro SONOBE, Mayu KOMATSU
  • Publication number: 20170141380
    Abstract: An object of the present invention is to provide an all-solid battery having high energy density. The problem can be solved by a negative electrode for an all-solid battery comprising: a carbonaceous material having a true density of from 1.30 g/cm3 to 1.70 g/cm3 determined by a butanol method, a specific surface area of from 0.5 to 50.0 m2/g, an average particle size Dv50 of from 1 to 50 ?m, and a combustion peak T (° C.) according to differential thermal analysis and a butanol true density ?Bt (g/cm3) satisfying the following formula (1): 300?T?100×?Bt?570??(1) and a solid electrolyte.
    Type: Application
    Filed: March 31, 2015
    Publication date: May 18, 2017
    Applicant: Kureha Corporation
    Inventors: Kenta AOKI, Shota KOBAYASHI, Tatsuya YAGUCHI, Hiroshi IMOTO, Yasuhiro TADA, Naohiro SONOBE
  • Publication number: 20170125811
    Abstract: The object of the present invention is to provide a carbonaceous material which is obtainable from plant-derived char and has a decreased specific surface area. Further, the object of the present invention is to provide a non-aqueous electrolyte secondary battery having excellent dedoping capacity, non-dedoping capacity, and charge-discharge efficiency. The object can be solved by a carbonaceous material for non-aqueous electrolyte secondary batteries characterized in that the carbonaceous material is obtained by heat-treating plant-derived char which is demineralized in gas-phase, and carbon precursor or volatile organic compound under a non-oxidizing gas atmosphere; and a specific surface area determined by a BET method is 10 m2/g or less.
    Type: Application
    Filed: January 18, 2017
    Publication date: May 4, 2017
    Applicants: KUREHA CORPORATION, KURARAY CO., LTD., KURARAY CHEMICAL CO., LTD.
    Inventors: Makoto IMAJI, Kenta AOKI, Yasuhiro TADA, Naohiro SONOBE, Junichi ARIMA, Kenichi KOYAKUMARU, Hideharu IWASAKI, Kiyoto OTSUKA, Jiro MASUKO, Hajime KOMATSU, Shinya TAGO
  • Publication number: 20170018775
    Abstract: A negative electrode material for a non-aqueous electrolyte secondary battery and the like with high discharge capacity relative to volume and excellent cycle characteristics are provided. The negative electrode material for a non-aqueous electrolyte secondary battery of the present invention comprises, as an active material, a carbon material mixture including a non-graphitic carbon material and a graphitic material. In this carbon material mixture, the non-graphitic carbon material has an atom ratio (H/C) of hydrogen atoms to carbon atoms determined by elemental analysis of 0.10 or less, and an average particle size (Dv50) of from 1 to 8 ?m; and the graphitic material has a true density (?Bt) determined by a pycnometer method using butanol of 2.15 g/cm3 or greater. The true density (?Bt) of the non-graphitic carbon material is preferably 1.52 g/cm3 or greater and less than 2.15 g/cm3.
    Type: Application
    Filed: March 27, 2015
    Publication date: January 19, 2017
    Inventors: SHOTA KOBAYASHI, YASUFUMI IKEYAMA, YASUHIRO TADA, NAOHIRO SONOBE, MAYU KOMATSU