Patents by Inventor Kento Hoshi

Kento Hoshi 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: 20210273224
    Abstract: A negative electrode material for a lithium-ion secondary battery includes: graphitic particles having a standard deviation of degree of circularity of from 0.05 to 0.10 in a range in which a cumulative frequency of degree of circularity from a lower degree of circularity is from 10% by particle to 90% by particle in a cumulative frequency distribution with respect to a degree of circularity obtained using a flow-type particle analyzer; and carbon particles having an average degree of circularity of 0.94 or less, the average degree of circularity being obtained using a flow-type particle analyzer.
    Type: Application
    Filed: July 11, 2018
    Publication date: September 2, 2021
    Inventors: Kento HOSHI, Yoshinori UCHIYAMA
  • Patent number: 11031597
    Abstract: A negative electrode material for a lithium-ion secondary battery contains graphitic particles of which a standard deviation of circularity at a cumulative frequency ranging from 10% by particle to 90% by particle from the lower circularity, determined by a flow-type particle analyzer, is from 0.05 to 0.1.
    Type: Grant
    Filed: January 4, 2018
    Date of Patent: June 8, 2021
    Assignee: SHOWA DENKO MATERIALS CO., LTD.
    Inventors: Kento Hoshi, Hideyuki Tsuchiya, Tsutomu Satoh
  • Publication number: 20210135220
    Abstract: An anode material for a lithium ion secondary battery including a carbon material satisfying the following (1) to (3), (6), and (7): (1) an average particle size (D50) is 22 ?m or less, (2) D90/D10 of particle sizes is 2.2 or less, (3) a linseed oil absorption amount is 50 mL/100 g or less, (6) a portion of the carbon material with a sphericity of from 0.6 to 0.8 and a particle size of from 10 ?m to 20 ?m is 5% by number or more, and (7) a portion of the carbon material with the sphericity of 0.7 or less and a particle size of 10 ?m or less is 0.3% by number or less.
    Type: Application
    Filed: January 29, 2018
    Publication date: May 6, 2021
    Inventors: Motohiro ISAKA, Hideyuki TSUCHIYA, Kento HOSHI, Tsutomu SATOH, Keita SUGA
  • Publication number: 20210083288
    Abstract: This negative electrode material for lithium ion secondary batteries has a C of 5.5 or less, C being a value obtained from a formula C=(pressure B?pressure A)/(1.70?1.35), where pressure A (kN/cm2) is defined as the pressure at which, when a 3.0 g specimen packed into a column space having a diameter of 15 mm is pressed down at a rate of 10 mm/min, a density of 1.35 g/cm3 is obtained, and pressure B (kN/cm2) is defined as the pressure at which a density of 1.70 g/cm3 is obtained.
    Type: Application
    Filed: March 28, 2018
    Publication date: March 18, 2021
    Applicant: HITACHI CHEMICAL COMPANY, LTD.
    Inventors: Hideyuki TSUCHIYA, Takashi SAKAMOTO, Takeshi MASAYOSHI, Kento HOSHI, Takayuki MIYAUCHI, Takashi KUBOTA
  • Publication number: 20190348679
    Abstract: A negative electrode material for a lithium-ion secondary battery contains graphitic particles of which a standard deviation of circularity at a cumulative frequency ranging from 10% by particle to 90% by particle from the lower circularity, determined by a flow-type particle analyzer, is from 0.05 to 0.1.
    Type: Application
    Filed: January 4, 2018
    Publication date: November 14, 2019
    Inventors: Kento HOSHI, Hideyuki TSUCHIYA, Tsutomu SATOH
  • Publication number: 20190097218
    Abstract: Provided is an anode material for a lithium ion secondary battery, which the anode material satisfies at least one of the following (1) or (2). (1) The anode material includes: a first carbon material as a core; and a second carbon material present on at least a part of a surface of the first carbon material, and having a crystallinity lower than the crystallinity of the first carbon material; and the anode material has at least two peaks within the range of from 395 eV to 405 eV in an X-ray photoelectron spectrum thereof. (2) The anode material has an R value of from 0.1 to 1.0, and has at least two peaks within the range of from 395 eV to 405 eV in an X-ray photoelectron spectrum thereof.
    Type: Application
    Filed: April 28, 2017
    Publication date: March 28, 2019
    Inventors: Tsutomu SATOH, Hideyuki TSUCHIYA, Motohiro ISAKA, Kento HOSHI, Keita SUGA, Yoshinori UCHIYAMA
  • Patent number: 9899673
    Abstract: The invention addresses the problem of providing a lithium ion secondary battery excellent in initial charge-discharge characteristics and life characteristics. To solve the above problem, the invention provides a lithium ion secondary battery in which an electrode group having a positive electrode and a negative electrode is housed in a battery can, wherein the negative electrode includes a negative electrode active material supported on a negative electrode foil, and the negative electrode active material includes cores having SiO as a main component, a composite oxide coating layer of Fe and SiO2 disposed on the periphery of each of the cores, and a carbon coating layer disposed on the periphery of the composite oxide coating layer of Fe and SiO2.
    Type: Grant
    Filed: May 19, 2014
    Date of Patent: February 20, 2018
    Assignee: Hitachi, Ltd.
    Inventors: Naokage Tanaka, Kento Hoshi, Shuichi Suzuki, Hiroshi Haruna
  • Patent number: 9735428
    Abstract: Provided is a negative electrode material for a lithium ion secondary battery, which has excellent high-temperature storage characteristics and cycle characteristics. The negative electrode material for a lithium ion secondary battery has a high molecular weight polymer adsorbed on a carbon material, the O/C value of surface functional group quantity is 4.5% or more and 25% or less in the negative electrode material for a lithium ion secondary battery, and the S/C value of surface functional group quantity is 0.05% or more and 2.5% or less in the negative electrode material for a lithium ion secondary battery. Also provided are a negative electrode for a lithium ion secondary battery, lithium ion secondary battery, and methods for producing the negative electrode material, the negative electrode, and the battery.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: August 15, 2017
    Assignee: HITACHI, LTD.
    Inventors: Akihide Tanaka, Etsuko Nishimura, Kento Hoshi
  • Publication number: 20170104211
    Abstract: The invention addresses the problem of providing a lithium ion secondary battery excellent in initial charge-discharge characteristics and life characteristics. To solve the above problem, the invention provides a lithium ion secondary battery in which an electrode group having a positive electrode and a negative electrode is housed in a battery can, wherein the negative electrode includes a negative electrode active material supported on a negative electrode foil, and the negative electrode active material includes cores having SiO as a main component, a composite oxide coating layer of Fe and SiO2 disposed on the periphery of each of the cores, and a carbon coating layer disposed on the periphery of the composite oxide coating layer of Fe and SiO2.
    Type: Application
    Filed: May 19, 2014
    Publication date: April 13, 2017
    Inventors: Naokage TANAKA, Kento HOSHI, Shuichi SUZUKI, Hiroshi HARUNA
  • Patent number: 9614216
    Abstract: The invention provides a negative electrode material for lithium ion secondary battery, including a composite particle of a first particle containing a carbonic substance A and a second particle containing silicon, which are combined with a carbonic substance B, wherein, when a cross-section of the composite particle is observed with respect to: the content of silicon atom in a core region in a circle having a center thereof on the midpoint of the major axis, which constitutes the maximum length, and having a radius of ? of the length of the minor axis orthogonally intersecting the major axis at the midpoint thereof, and the content thereof in a rim region extending from the circumference to a depth of ? of the length of the minor axis, the ratio of the content in the rim region to that in the core region is 2 or higher.
    Type: Grant
    Filed: December 9, 2011
    Date of Patent: April 4, 2017
    Assignee: HITACHI CHEMICAL COMPANY, LTD.
    Inventors: Masayuki Kouzu, Kento Hoshi, Toshikatsu Shimazaki
  • Publication number: 20150349341
    Abstract: A reduction in irreversible capacity is attained without degrading other battery characteristics. A negative electrode material, a negative electrode for lithium ion secondary battery, a lithium ion secondary battery, and a manufacturing method thereof, the negative electrode material containing a carbonaceous material, in which the interplanar spacing (d002) between (002) planes of the carbonaceous material determined by an X-ray wide-angle diffraction method is smaller than or equal to 0.338 nm, the integrated pore volume of the carbonaceous material in pore diameters of 2 nm or more to 3.5 nm or less determined from a gas adsorption method is 3.0×10?2 cc/g or less, and, for example, a water-soluble polymer is contained in the carbonaceous material.
    Type: Application
    Filed: June 12, 2013
    Publication date: December 3, 2015
    Applicant: Hitachi, Ltd.
    Inventors: Kento HOSHI, Akihide TANAKA, Etsuko NISHIMURA
  • Publication number: 20150207146
    Abstract: Provided is a negative electrode material for a lithium ion secondary battery, which has excellent high-temperature storage characteristics and cycle characteristics. The negative electrode material for a lithium ion secondary battery has a high molecular weight polymer adsorbed on a carbon material, the O/C value of surface functional group quantity is 4.5% or more and 25% or less in the negative electrode material for a lithium ion secondary battery, and the S/C value of surface functional group quantity is 0.05% or more and 2.5% or less in the negative electrode material for a lithium ion secondary battery. Also provided are a negative electrode for a lithium ion secondary battery, lithium ion secondary battery, and methods for producing the negative electrode material, the negative electrode, and the battery.
    Type: Application
    Filed: June 28, 2013
    Publication date: July 23, 2015
    Applicant: HITACHI, LTD.,
    Inventors: Akihide Tanaka, Etsuko Nishimura, Kento Hoshi
  • Publication number: 20130302675
    Abstract: The invention provides a negative electrode material for lithium ion secondary battery, including a composite particle of a first particle containing a carbonic substance A and a second particle containing silicon, which are combined with a carbonic substance B, wherein, when a cross-section of the composite particle is observed with respect to: the content of silicon atom in a core region in a circle having a center thereof on the midpoint of the major axis, which constitutes the maximum length, and having a radius of ? of the length of the minor axis orthogonally intersecting the major axis at the midpoint thereof, and the content thereof in a rim region extending from the circumference to a depth of ? of the length of the minor axis, the ratio of the content in the rim region to that in the core region is 2 or higher.
    Type: Application
    Filed: December 9, 2011
    Publication date: November 14, 2013
    Applicant: HITACHI CHEMICAL COMPANY, LTD.
    Inventors: Masayuki Kouzu, Kento Hoshi, Toshikatsu Shimazaki