Patents by Inventor Akira Nakasuga

Akira Nakasuga 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: 10741832
    Abstract: A positive electrode active material for a lithium ion battery includes a coating layer comprising amorphous carbon on a surface of a positive electrode active material, wherein the amorphous carbon is derived from carbon contained in an oxazine resin, a ratio of a peak intensity of a G band to a peak intensity of a D band is 1.0 or greater when the amorphous carbon is measured by Raman spectroscopy, an average film thickness of the coating layer is 100 nm or less, and a coefficient of variation (CV value) of a film thickness of the coating layer is 10% or less.
    Type: Grant
    Filed: March 27, 2017
    Date of Patent: August 11, 2020
    Assignee: SEKISUI CHEMICAL CO., LTD.
    Inventors: Ren-de Sun, Shoji Nozato, Akira Nakasuga, Masanori Nakamura
  • Publication number: 20200207777
    Abstract: Provided is a new polycyclic aromatic hydrocarbon derivative. The polycyclic aromatic hydrocarbon derivative is a derivative of a polycyclic aromatic hydrocarbon having 6 or more aromatic rings and has a substituent represented by the following formula (1). (In the formula (1), R1 and R2 are carbon atoms of the aromatic rings in the polycyclic aromatic hydrocarbon, and R3 to R5 are carbon atoms of an aromatic ring or a heterocyclic ring in a group having the aromatic ring or the heterocyclic ring. n is 0 or 1, and m is the number of substituents.
    Type: Application
    Filed: July 17, 2018
    Publication date: July 2, 2020
    Inventors: Akira Nakasuga, Shoji Nozato, Hiroji Fukui, Takeharu Haino, Ryo Sekiya
  • Patent number: 10680237
    Abstract: There is provided an active material-exfoliated graphite composite that allows a lithium ion secondary battery to be obtained in which the initial capacity is large and deterioration in charge and discharge cycle characteristics is less likely to occur, when used for a negative electrode material for lithium ion secondary batteries. An active material-exfoliated graphite composite comprising: partially exfoliated graphite having a structure in which graphite is partially exfoliated; and an active material that is in the form of particles capable of intercalating and deintercalating lithium ions by composite formation with the partially exfoliated graphite, or particles capable of adsorbing and desorbing lithium ions by composite formation with the partially exfoliated graphite, wherein the active material has an average particle diameter of 1 ?m or more and 100 ?m or less.
    Type: Grant
    Filed: March 22, 2016
    Date of Patent: June 9, 2020
    Assignee: SEKISUI CHEMICAL CO., LTD.
    Inventors: Akihiko Fujiwara, Shoji Nozato, Akira Nakasuga, Hiroshi Yoshitani
  • Publication number: 20200176816
    Abstract: Provided is a carbon material that can improve the cycle characteristic in charge and discharge of an all-solid-state battery. The carbon material is a carbon material to be contained in a positive electrode and/or a negative electrode of an all-solid-state battery comprising a group 1- or group 2-ionic conductive solid electrolyte, wherein in an X-ray diffraction spectrum of a mixture of the carbon material and Si in a weight ratio of 1:1, a ratio a/b is 0.2 or higher and 10.0 or lower, where a represents a height of the highest peak in the range of 2? of 24° or larger and smaller than 28° and b represents a height of the highest peak in the range of 2? of 28° or larger and smaller than 30°.
    Type: Application
    Filed: August 1, 2018
    Publication date: June 4, 2020
    Inventors: Yuuki Sawada, Hiroki Masuda, Akira Nakasuga, Akihiko Fujiwara
  • Patent number: 10658126
    Abstract: There is provided a capacitor electrode material that does not require the use of a conductive aid and can increase the capacitance of an electric double layer capacitor. A capacitor electrode material comprising resin-remaining partially exfoliated graphite obtained by pyrolyzing a resin in a composition in which the resin is fixed to graphite or primary exfoliated graphite by grafting or adsorption, the resin-remaining partially exfoliated graphite having a structure in which graphite is partially exfoliated, with part of the resin remaining; and a binder resin.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: May 19, 2020
    Assignees: SEKISUI CHEMICAL CO., LTD., OITA UNIVERSITY
    Inventors: Akihiko Fujiwara, Shoji Nozato, Akira Nakasuga, Shunji Hyodo, Hiroshi Yoshitani, Masahiro Toyoda
  • Patent number: 10647912
    Abstract: A carbon-coated vanadium dioxide particle includes a vanadium dioxide particle; and a coating layer containing amorphous carbon on a surface of the vanadium dioxide particle, the amorphous carbon being derived from carbon contained in an oxazine resin, and having a peak intensity ratio of a G band to a band of 1.5 or greater as determined from a Raman spectrum. The coating layer has an average thickness of 50 nm or less. The coating layer has a coefficient of variation (CV value) of thickness of 7% or less.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: May 12, 2020
    Assignee: SEKISUI CHEMICAL CO., LTD.
    Inventors: Ren-de Sun, Shoji Nozato, Akira Nakasuga, Masanori Nakamura, Naoyuki Nagatani, Keigo Oowashi
  • Patent number: 10644318
    Abstract: Provided is a carbonaceous material capable of enhancing the initial charge and discharge efficiency and the cycle characteristics of lithium ion secondary batteries. The carbonaceous material is used as an electrode material for a lithium ion secondary battery and has a volume resistivity of 0.7 ?·cm or less as measured at a pressure of 13 MPa in the form of a mixture of 5 wt % of the carbonaceous material and 95 wt % of lithium cobaltate.
    Type: Grant
    Filed: May 10, 2016
    Date of Patent: May 5, 2020
    Assignee: SEKESUI CHEMICAL CO., LTD.
    Inventors: Takuya Wada, Hiroki Masuda, Naoki Sasagawa, Akira Nakasuga, Shoji Nozato
  • Publication number: 20200136143
    Abstract: Provided is a carbon material-containing dispersion liquid that is excellent in dispersibility when used as a slurry for electrode formation of a secondary battery, and is capable of enhancing the battery characteristics such as output characteristics of the secondary battery. A carbon material-containing dispersion liquid includes a carbon material and a dispersion medium for the carbon material. In the carbon material-containing dispersion liquid, a concentration of the carbon material in the carbon material-containing dispersion liquid is 0.01% by weight or more and 20% by weight or less, and a light transmittance at a wavelength of 650 nm of a supernatant of the carbon material-containing dispersion liquid when the carbon material-containing dispersion liquid is left to stand at 25° C. for 24 hours after preparation is 1% or more and 60% or less.
    Type: Application
    Filed: June 4, 2018
    Publication date: April 30, 2020
    Inventors: Hiroki Masuda, Yuuki Sawada, Akira Nakasuga, Akihiko Fujiwara
  • Publication number: 20200118702
    Abstract: Provided is a conductive paste which makes it possible to form a conductive layer having excellent conductivity even when spherical copper powder having a small particle diameter is used. Disclosed is a conductive paste containing a conductive filler and a binder resin.
    Type: Application
    Filed: June 28, 2018
    Publication date: April 16, 2020
    Inventors: Masahiro Ishii, Akira Nakasuga, Shoji Nozato, Shigekatsu Ohnishi
  • Publication number: 20190292444
    Abstract: A light-modulating material of which the light transmittance can be controlled over a wide region from visible light to infrared light by voltage application is provided. The light-modulating material comprises a graphene-like carbon material having an aspect ratio of 3 or more and 330 or less.
    Type: Application
    Filed: July 21, 2017
    Publication date: September 26, 2019
    Inventors: Rende Sun, Akira Nakasuga, Shoji Nozato, Keigo Oowashi, Hiroji Fukui, Takeharu Haino, Ryo Sekiya
  • Publication number: 20190284389
    Abstract: Provided is a gas barrier material having superior gas barrier properties. This gas barrier material 1 comprises a matrix resin 2, and a carbon material 3 disposed in the matrix resin 2, wherein the carbon material 3 contains a partially exfoliated graphite having a structure in which graphite is partially exfoliated.
    Type: Application
    Filed: February 27, 2018
    Publication date: September 19, 2019
    Inventors: Mikitoshi Suematsu, Hiroji Fukui, Akira Nakasuga, Shoji Nozato
  • Publication number: 20190173087
    Abstract: There is provided an electrode material for electricity storage devices, which enables suppression of heat generation in charge and discharge at large currents. The electrode material for electricity storage devices comprises a first carbon material having a graphite structure wherein graphite is partially exfoliated, and a second carbon material different from the first carbon material, wherein the ratio A/B, where A represents a weight of the first carbon material and B represents a weight of the second carbon material, is within the range of 0.01 or higher and 100 or lower.
    Type: Application
    Filed: August 29, 2017
    Publication date: June 6, 2019
    Inventors: Yuuki Sawada, Hiroki Masuda, Akira Nakasuga, Akihiko Fujiwara, Takuya Wada
  • Patent number: 10167198
    Abstract: There is provided a method for producing relatively easily handleable exfoliated graphite by exfoliating graphite without complicated steps, and exfoliated graphite obtained by the method. A method for producing exfoliated graphite, comprising steps of preparing a composition which comprises graphite or primary exfoliated graphite and a polymer and in which the polymer is fixed to the graphite or primary exfoliated graphite; and pyrolyzing the polymer contained in the composition to exfoliate the graphite or primary exfoliated graphite and remove the polymer by pyrolysis.
    Type: Grant
    Filed: February 12, 2013
    Date of Patent: January 1, 2019
    Assignee: SEKISUI CHEMICAL CO., LTD.
    Inventors: Shoji Nozato, Akira Nakasuga, Hiroshi Yoshitani
  • Publication number: 20180354798
    Abstract: The present invention provides black particles having high electrical insulation properties, high blackness in a visible light region, and excellent dispersibility, and a method for producing the black particles. The present invention relates to black particles containing amorphous carbon, the amorphous carbon being derived from carbon contained in an oxazine resin, the black particles having a specific gravity of 1.8 g/cm3 or less, a zeta potential of ?70 to +80 mV, an average total light reflectance measured at a wavelength of 400 to 800 nm of 5% or less, and a peak intensity ratio between G band and D band as determined from a Raman spectrum of 1.2 or more.
    Type: Application
    Filed: February 17, 2017
    Publication date: December 13, 2018
    Applicants: SEKISUI CHEMICAL CO., LTD., NATIONAL UNIVERSITY CORPORATION KUMAMOTO UNIVERSITY
    Inventors: Ren-de SUN, Shoji NOZATO, Akira NAKASUGA, Hirotaka IHARA, Makoto TAKAFUJI, Yutaka KUWAHARA, Akiko MURAKAMI
  • Patent number: 10121717
    Abstract: A carbon-coated thermal conductive material includes a coating layer comprising amorphous carbon on a surface of a thermal conductive material, wherein the thermal conductive material comprises a metal oxide, a metal nitride, a metal material, or a carbon-based material having a thermal conductivity of 10 W/mK or greater, the amorphous carbon is derived from carbon contained in an oxazine resin, a ratio of a peak intensity of a G band to a peak intensity of a D band is 1.0 or greater when the amorphous carbon is measured by Raman spectroscopy, an average film thickness of the coating layer is 500 nm or less, and a coefficient of variation (CV value) of a film thickness of the coating layer is 15% or less.
    Type: Grant
    Filed: March 27, 2017
    Date of Patent: November 6, 2018
    Assignee: SEKISUI CHEMICAL CO., LTD.
    Inventors: Ren-de Sun, Shoji Nozato, Akira Nakasuga, Masanori Nakamura
  • Patent number: 10113047
    Abstract: There is provided an exfoliated graphite-resin composite material that has high dispersibility in resins and the like and is easily handled. An exfoliated graphite-resin composite material in which exfoliated graphite and a resin form a composite. When an amount of methylene blue adsorbed per g of the exfoliated graphite-resin composite material (?mol/g) is y, the amount of methylene blue adsorbed as measured based on a difference between an absorbance of a methanol solution of methylene blue at a concentration of 10 mg/L and an absorbance of a supernatant liquid obtained by introducing the exfoliated graphite-resin composite material into the methanol solution of methylene blue and performing centrifugation, and a BET specific surface area (m2/g) of the exfoliated graphite-resin composite material is x, a ratio y/x is 0.15 or more, and the BET specific surface area is 25 m2/g or more.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: October 30, 2018
    Assignee: SEKISUI CHEMICAL CO., LTD.
    Inventors: Shoji Nozato, Akira Nakasuga, Hiroshi Yoshitani
  • Patent number: 9919926
    Abstract: The present invention provides a method for producing a random-structure GIC in which exfoliated graphite having a low regularity of a graphene stacked state and a small number of stacked graphene layers can be easily obtained by exfoliation treatment. The method includes the steps of providing an alkali metal-GIC having an alkali metal intercalated between graphene layers and bringing a polar protic solvent into contact with the alkali metal-GIC in a non-oxidizing atmosphere.
    Type: Grant
    Filed: March 4, 2014
    Date of Patent: March 20, 2018
    Assignees: SEKISUI CHEMICAL CO., LTD., OITA UNIVERSITY
    Inventors: Takuya Wada, Akira Nakasuga, Masahiro Toyoda
  • Publication number: 20180062179
    Abstract: Provided is a carbonaceous material capable of enhancing the initial charge and discharge efficiency and the cycle characteristics of lithium ion secondary batteries. The carbonaceous material is used as an electrode material for a lithium ion secondary battery and has a volume resistivity of 0.7 ?·cm or less as measured at a pressure of 13 MPa in the form of a mixture of 5 wt % of the carbonaceous material and 95 wt % of lithium cobaltate.
    Type: Application
    Filed: May 10, 2016
    Publication date: March 1, 2018
    Inventors: Takuya WADA, Hiroki MASUDA, Naoki SASAGAWA, Akira NAKASUGA, Shoji NOZATO
  • Patent number: 9884934
    Abstract: Provided is a production method which can attain exfoliating treatment of graphite and a process of grafting a polymer onto exfoliated graphite simultaneously and thus makes it possible to easily obtain an exfoliated graphite-polymer composite material in a short time. A method for producing an exfoliated graphite-polymer composite material includes a step of mixing graphite or primary exfoliated graphite, a depolymerizable monomer of which the polymer is decomposed by heating to generate radicals and also to form a monomer or an oligomer, or the polymer A of the monomer, or a polymer B which forms radicals at a temperature close to its decomposition temperature to obtain a mixture; and a heating step of putting the mixture in a non-open container to heat the mixture to a first temperature range from the ceiling temperature or higher to the onset decomposition temperature or lower, or to a temperature higher than the first temperature range.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: February 6, 2018
    Assignee: SEKISUI CHEMICAL CO., LTD.
    Inventors: Akira Nakasuga, Shouji Nozato, Takuya Wada, Hiroshi Yoshitani
  • Publication number: 20170298261
    Abstract: There is provided a thermally conductive sheet having excellent thermal conductivity in the thickness direction of the sheet. A thermally conductive sheet comprising expanded graphite; and orientation-controlling particles, wherein at least part of the expanded graphite is oriented in a direction different from a plane direction of the sheet by the orientation-controlling particles.
    Type: Application
    Filed: November 27, 2015
    Publication date: October 19, 2017
    Inventors: Shoji Nozato, Akira Nakasuga, Akihiko Fujiwara, Hirotaka Ihara, Makoto Takafuji, Eisaku Sato