Patents by Inventor Yuji Yokoyama

Yuji Yokoyama 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: 12374693
    Abstract: Provided is an electrode slurry carbon nanotube liquid dispersion which improves charge/discharge cycle characteristics. An electrode slurry carbon nanotube liquid dispersion which is one aspect of the present disclosure and contains 0.1-1.5 mass % of carbon nanotubes, a dispersion medium, and carboxymethyl cellulose, the viscosity of which at 100s?1 in a 3% aqueous solution is 2-200 mPa·s, wherein: the carboxymethyl cellulose content constitutes 50-250 parts by mass relative to 100 parts by mass of carbon nanotubes; the viscosity at 100s?1 is 50-200 mPa·s in a state in which the carbon nanotubes are dispersed; and the particle distribution according to the laser diffraction method exhibits a D10 of 0.3-1.0 ?m, a D50 of 3-10 ?m and a D90 of 60 ?m or less in a state in which the carbon nanotubes are dispersed.
    Type: Grant
    Filed: November 26, 2021
    Date of Patent: July 29, 2025
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Yusuke Fukumoto, Nobuhiro Hirano, Masanori Sugimori, Yuji Yokoyama
  • Publication number: 20250167240
    Abstract: A method for producing a carbon nanotube dispersion liquid includes performing: a first process of allowing a mixture liquid of a carbon nanotube and a solvent to pass through a valve-type homogenizer adjusted to a first valve opening degree; and a second process of allowing the mixture liquid that has been subjected to the first process to pass through the valve-type homogenizer adjusted to a second valve opening degree narrower than the first valve opening degree.
    Type: Application
    Filed: February 24, 2023
    Publication date: May 22, 2025
    Inventors: Yuji YOKOYAMA, Nobuhiro HIRANO, Masanori SUGIMORI, Satoshi KOMI
  • Patent number: 12266784
    Abstract: A negative electrode for a nonaqueous electrolyte secondary battery comprises a negative electrode core body, and a negative electrode mixture layer. When the range of 40% of the thickness of the negative electrode mixture layer from the surface of the negative electrode mixture layer on the side opposite to the negative electrode core body is defined as a first region and the range of 40% of the thickness of the negative electrode mixture layer from the interface between the negative electrode mixture layer and the negative electrode core body is defined as a second region, the BET specific surface area of the graphite included in the first region is smaller than the BET specific surface area of the graphite included in the second region.
    Type: Grant
    Filed: December 22, 2020
    Date of Patent: April 1, 2025
    Assignees: PANASONIC HOLDINGS CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masanori Sugimori, Yusuke Fukumoto, Yuji Yokoyama, Nobuhiro Hirano, Yo Kato
  • Patent number: 12257969
    Abstract: An off-road vehicle includes: a vehicle body frame to which a roll-over protection structure (ROPS) is detachably attachable; and a reinforcing frame that is detachably attachable to the vehicle body frame instead of the ROPS. The vehicle body frame includes a first vehicle body frame located forward of a driver's seat, and a second vehicle body frame located rearward of the driver's seat. The reinforcing frame couples the first vehicle body frame and the second vehicle body frame to each other.
    Type: Grant
    Filed: June 1, 2023
    Date of Patent: March 25, 2025
    Assignee: KAWASAKI MOTORS, LTD.
    Inventors: Takashi Hisamura, Naoki Kawaguchi, Yuji Yokoyama
  • Publication number: 20240399993
    Abstract: An off-road vehicle includes: a vehicle body frame to which a roll-over protection structure (ROPS) is detachably attachable; and a reinforcing frame that is detachably attachable to the vehicle body frame instead of the ROPS. The vehicle body frame includes a first vehicle body frame located forward of a driver's seat, and a second vehicle body frame located rearward of the driver's seat. The reinforcing frame couples the first vehicle body frame and the second vehicle body frame to each other.
    Type: Application
    Filed: June 1, 2023
    Publication date: December 5, 2024
    Applicant: KAWASAKI MOTORS, LTD.
    Inventors: Takashi HISAMURA, Naoki KAWAGUCHI, Yuji YOKOYAMA
  • Publication number: 20240128440
    Abstract: This negative electrode for a lithium ion secondary battery is characterized by comprising a negative electrode mixture layer containing a carbon-based negative electrode active material, a Si-based negative electrode active material, and carbon nanotubes, wherein when 100 is the ratio at which the carbon nanotubes coat the surface of the Si-based negative electrode active material, the ratio at which the carbon nanotubes coat the surface of the carbon-based negative electrode active material is at least 20 but no higher than 50.
    Type: Application
    Filed: January 24, 2022
    Publication date: April 18, 2024
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Nobuhiro Hirano, Yusuke Fukumoto, Masanori Sugimori, Yuji Yokoyama
  • Publication number: 20240105958
    Abstract: Provided is a carbon nanotube dispersion liquid for an electrode slurry such that it is possible to inhibit a decrease in a charge-discharge cycle characteristic. A carbon nanotube dispersion liquid for an electrode slurry according to one aspect of the present disclosure includes carbon nanotubes having a diameter of 0.4 to 2 nm, a dispersant, and a dispersion medium. In a Raman spectroscopy spectrum, the carbon nanotubes have a G/D ratio, which is the ratio of the peak intensities of the G-band (1560 to 1600 cm?1) and the D-band (1310 to 1350 cm?1), within the range of 50 to 200, and in a volume-based particle size distribution via a laser diffraction method, the carbon nanotubes have 3 to 5 peaks, and if the peaks are, from the small particle diameter side, P1, P2, . . . , Pn, the greatest frequency peak is in the range pf P2 to Pn-1.
    Type: Application
    Filed: December 6, 2021
    Publication date: March 28, 2024
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Masanori Sugimori, Yusuke Fukumoto, Yuji Yokoyama, Nobuhiro Hirano
  • Publication number: 20240055613
    Abstract: Provided is an electrode slurry carbon nanotube liquid dispersion which improves charge/discharge cycle characteristics. An electrode slurry carbon nanotube liquid dispersion which is one aspect of the present disclosure and contains 0.1-1.5 mass % of carbon nanotubes, a dispersion medium, and carboxymethyl cellulose, the viscosity of which at 100 s?1 in a 3% aqueous solution is 2-200 mPa·s, wherein: the carboxymethyl cellulose content constitutes 50-250 parts by mass relative to 100 parts by mass of carbon nanotubes; the viscosity at 100 s?1 is 50-200 mPa·s in a state in which the carbon nanotubes are dispersed; and the particle distribution according to the laser diffraction method exhibits a D10 of 0.3-1.0 ?m, a D50 of 3-10 ?m and a D90 of 60 ?m or less in a state in which the carbon nanotubes are dispersed.
    Type: Application
    Filed: November 26, 2021
    Publication date: February 15, 2024
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yusuke Fukumoto, Nobuhiro Hirano, Masanori Sugimori, Yuji Yokoyama
  • Patent number: 11728472
    Abstract: A negative electrode for a nonaqueous electrolyte secondary battery, which is an example of embodiments, comprises a negative electrode core body and a negative electrode mixture layer provided on the surface of the negative electrode core body. The negative electrode mixture layer includes graphite and fibrous carbon. The BET specific surface area of the graphite included in the first region is smaller than the BET specific surface area of the graphite included in the second region. In addition, the average length of the fibrous carbon included in the first region is longer than the average length of the fibrous carbon included in the second region.
    Type: Grant
    Filed: December 16, 2020
    Date of Patent: August 15, 2023
    Assignees: PANASONIC HOLDINGS CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masanori Sugimori, Yusuke Fukumoto, Yuji Yokoyama, Nobuhiro Hirano, Yo Kato
  • Patent number: 11728471
    Abstract: A negative electrode for a nonaqueous electrolyte secondary battery, which is an example of embodiments, comprises a negative electrode core body and a negative electrode mixture layer provided on the surface of the negative electrode core body. The negative electrode mixture layer includes graphite and fibrous carbon. The BET specific surface area of the graphite included in the first region is smaller than the BET specific surface area of the graphite included in the second region. In addition, the average length of the fibrous carbon included in the second region is longer than the average length of the fibrous carbon included in the first region.
    Type: Grant
    Filed: December 16, 2020
    Date of Patent: August 15, 2023
    Assignees: PANASONIC HOLDINGS CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yusuke Fukumoto, Masanori Sugimori, Yuji Yokoyama, Nobuhiro Hirano, Yo Kato
  • Patent number: 11721802
    Abstract: A negative electrode for a nonaqueous electrolyte secondary battery comprises a negative electrode core body and a negative electrode mixture layer provided. When the range of 40% of the thickness of the negative electrode mixture layer from the surface of the negative electrode mixture layer is defined as a first region and the range of 40% of the thickness of the negative electrode mixture layer from the surface of the negative electrode core body is defined as a second region, the BET specific surface area of the graphite included in the first region is smaller than that of the graphite included in the second region. The first region includes the multiwalled fibrous carbon more than the single wall fibrous carbon in terms of mass and the second region includes the single wall fibrous carbon more than the multiwalled fibrous carbon in terms of mass.
    Type: Grant
    Filed: December 18, 2020
    Date of Patent: August 8, 2023
    Assignees: PANASONIC HOLDINGS CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yusuke Fukumoto, Masanori Sugimori, Yuji Yokoyama, Nobuhiro Hirano, Yo Kato
  • Patent number: 11641017
    Abstract: A non-aqueous electrolyte secondary battery includes an electrode current collector, an intermediate layer, and an electrode active material layer. The intermediate layer is interposed between the electrode current collector and the electrode active material layer. The intermediate layer contains a metal-covered microcapsule. The metal-covered microcapsule includes a microcapsule and a metal film. The microcapsule includes a core and a shell. The shell surrounds the core. The core includes a volatile material. The shell includes a thermoplastic resin material. The metal film covers at least part of an outer surface of the microcapsule.
    Type: Grant
    Filed: December 11, 2019
    Date of Patent: May 2, 2023
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Koji Torita, Yuji Yokoyama
  • Patent number: 11594353
    Abstract: A sintered magnet contains Sm—Fe—N-based crystal grains and has high coercivity; and a magnetic powder is capable of forming a sintered magnet without lowering the coercivity even if heat is generated in association with the sintering. A sintered magnet comprises a crystal phase composed of a plurality of Sm—Fe—N-based crystal grains and a nonmagnetic metal phase present between the Sm—Fe—N crystal grains adjacent to each other, wherein a ratio of Fe peak intensity IFe to SmFeN peak intensity ISmFeN measured by an X-ray diffraction method is 0.2 or less. A magnetic powder comprises Sm—Fe—N-based crystal particles and a nonmagnetic metal layer covering surfaces of the Sm—Fe—N crystal particles.
    Type: Grant
    Filed: July 8, 2019
    Date of Patent: February 28, 2023
    Assignees: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, Murata Manufacturing Co., Ltd.
    Inventors: Kenta Takagi, Wataru Yamaguchi, Takaaki Yokoyama, Kenji Sakaguchi, Kazuhiro Yoshii, Yuji Yokoyama
  • Publication number: 20220216474
    Abstract: This negative electrode for non-aqueous electrolyte secondary batteries comprises a negative electrode core and a negative electrode mixture layer provided on the surface of the negative electrode core and including a negative electrode active substance. The negative electrode mixture layer has: a first layer including substantially only graphite having a BET specific surface area of 0.5-2.5 m2/g, as a negative electrode active substance; and a second layer including substantially only at least either an element that alloys with lithium or a compound containing said element, as a negative electrode active substance.
    Type: Application
    Filed: April 8, 2020
    Publication date: July 7, 2022
    Applicant: Panasonic Corporation
    Inventors: Yuji Yokoyama, Kouhei Tsuzuki, Kohei Masai
  • Patent number: 11223047
    Abstract: A non-aqueous electrolyte secondary battery includes an electrode array and an electrolyte solution. The electrode array includes a positive electrode that includes a positive electrode current collector and a positive electrode composite material layer; a negative electrode that includes a negative electrode current collector and a negative electrode composite material layer; and a separator. The electrode array includes cellulose nanofibers. At least one of the peel strength between the positive electrode current collector and the positive electrode composite material layer and the peel strength between the negative electrode current collector and the negative electrode composite material layer is smaller than both the peel strength between the separator and the positive electrode composite material layer and the peel strength between the separator and the negative electrode composite material layer. The greater of the two peel strengths is at least 1.5 times greater than the smaller of the two.
    Type: Grant
    Filed: March 29, 2019
    Date of Patent: January 11, 2022
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yutaka Oyama, Yuji Yokoyama
  • Publication number: 20210202933
    Abstract: A negative electrode for a nonaqueous electrolyte secondary battery comprises a negative electrode core body, and a negative electrode mixture layer. When the range of 40% of the thickness of the negative electrode mixture layer from the surface of the negative electrode mixture layer on the side opposite to the negative electrode core body is defined as a first region and the range of 40% of the thickness of the negative electrode mixture layer from the interface between the negative electrode mixture layer and the negative electrode core body is defined as a second region, the BET specific surface area of the graphite included in the first region is smaller than the BET specific surface area of the graphite included in the second region.
    Type: Application
    Filed: December 22, 2020
    Publication date: July 1, 2021
    Applicants: Panasonic Corporation, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masanori Sugimori, Yusuke Fukumoto, Yuji Yokoyama, Nobuhiro Hirano, Yo Kato
  • Publication number: 20210202932
    Abstract: A negative electrode for a nonaqueous electrolyte secondary battery comprises a negative electrode core body and a negative electrode mixture layer provided. When the range of 40% of the thickness of the negative electrode mixture layer from the surface of the negative electrode mixture layer is defined as a first region and the range of 40% of the thickness of the negative electrode mixture layer from the surface of the negative electrode core body is defined as a second region, the BET specific surface area of the graphite included in the first region is smaller than that of the graphite included in the second region. The first region includes the multiwalled fibrous carbon more than the single wall fibrous carbon in terms of mass and the second region includes the single wall fibrous carbon more than the multiwalled fibrous carbon in terms of mass.
    Type: Application
    Filed: December 18, 2020
    Publication date: July 1, 2021
    Applicants: Panasonic Corporation, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yusuke Fukumoto, Masanori Sugimori, Yuji Yokoyama, Nobuhiro Hirano, Yo Kato
  • Publication number: 20210193992
    Abstract: A negative electrode for a nonaqueous electrolyte secondary battery, which is an example of embodiments, comprises a negative electrode core body and a negative electrode mixture layer provided on the surface of the negative electrode core body. The negative electrode mixture layer includes graphite and fibrous carbon. The BET specific surface area of the graphite included in the first region is smaller than the BET specific surface area of the graphite included in the second region. In addition, the average length of the fibrous carbon included in the first region is longer than the average length of the fibrous carbon included in the second region.
    Type: Application
    Filed: December 16, 2020
    Publication date: June 24, 2021
    Applicants: Panasonic Corporation, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masanori Sugimori, Yusuke Fukumoto, Yuji Yokoyama, Nobuhiro Hirano, Yo Kato
  • Publication number: 20210193991
    Abstract: A negative electrode for a nonaqueous electrolyte secondary battery, which is an example of embodiments, comprises a negative electrode core body and a negative electrode mixture layer provided on the surface of the negative electrode core body. The negative electrode mixture layer includes graphite and fibrous carbon. The BET specific surface area of the graphite included in the first region is smaller than the BET specific surface area of the graphite included in the second region. In addition, the average length of the fibrous carbon included in the second region is longer than the average length of the fibrous carbon included in the first region.
    Type: Application
    Filed: December 16, 2020
    Publication date: June 24, 2021
    Applicants: Panasonic Corporation, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yusuke Fukumoto, Masanori Sugimori, Yuji Yokoyama, Nobuhiro Hirano, Yo Kato
  • Patent number: 11011738
    Abstract: Provided is a method for producing a negative electrode by using a negative electrode active material and ceramic particles, the method ensuring satisfactory coatability of the paste and high peel strength and hardness of the obtained negative electrode active material layer. The method for producing a negative electrode disclosed herein includes a step of coating a negative electrode paste including a negative electrode active material and ceramic particles on a negative electrode current collector; a step of drying the coated negative electrode paste to form a negative electrode active material layer; and a step of pressing the negative electrode active material layer. The ceramic particles have an aspect ratio of 1.5 or more and 20 or less. The ceramic particles have a short side length of ? or less of an average particle diameter of the negative electrode active material.
    Type: Grant
    Filed: October 12, 2017
    Date of Patent: May 18, 2021
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazuhisa Takeda, Yuji Yokoyama, Keisuke Ohara