Patents by Inventor Masahiro Soga

Masahiro Soga 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: 20240405219
    Abstract: An electrode for secondary batteries according to one embodiment of the present invention is provided with a core body and a mixture layer that is formed on the core body. The mixture layer comprises a first mixture layer and a second mixture layer that is arranged on the first mixture layer. The tortuosity (?2) of the second mixture layer is lower than the tortuosity (?1) of the first mixture layer. The ratio (?2/?1) of the tortuosity (?2) to the tortuosity (?1) satisfies, for example, 0.3?(?2/?1)<1.
    Type: Application
    Filed: September 21, 2022
    Publication date: December 5, 2024
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Norihisa Yamamoto, Masahiro Soga, Naomichi Sato
  • Publication number: 20240405214
    Abstract: A secondary battery according to one embodiment of the present invention is provided with: a positive electrode that has a positive electrode core and a positive electrode mixture layer formed on said core; a negative electrode that has a negative electrode core and a negative electrode mixture layer formed on said core; and an electrolyte. The positive electrode mixture layer and the negative electrode mixture layer each includes a first mixture layer and a second mixture layer arranged on the first mixture layer. The curve ratio (?2) of the second mixture layer is less than the curve ratio (?1) of the first mixture layer.
    Type: Application
    Filed: September 22, 2022
    Publication date: December 5, 2024
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Norihisa Yamamoto, Masahiro Soga, Naomichi Sato
  • Publication number: 20240405205
    Abstract: An electrode for secondary batteries according to one example of an embodiment is provided with a core body and a mixture layer that is formed on the core body. The mixture layer includes a first mixture layer and a second mixture layer disposed on the first mixture layer, and contains graphite and silicon material as active materials, and the content of the silicon material is greater than or equal to 0.5% by mass with respect to the active material. The ratio (?2/?1) of the tortuosity factor (?2) of the second mixture layer to the tortuosity factor (?1) of the first mixture layer is less than 1.1.
    Type: Application
    Filed: September 21, 2022
    Publication date: December 5, 2024
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Masahiro Soga, Norihisa Yamamoto, Naomichi Sato
  • Publication number: 20240387810
    Abstract: This negative electrode for a rechargeable battery, according to an exemplary embodiment, comprises: a core; and a mixture layer formed on the core. The mixture layer includes: a first mixture layer; and a second mixture layer disposed on the first mixture layer. The first mixture layer and the second mixture layer have mutually different pore size distributions. In a case where a pore size corresponding to the maximum peak of the pore size distribution of the first mixture layer is defined as pore size A and a pore size corresponding to the maximum peak of the pore size distribution of the second mixture layer is defined as pore size B, the ratio of pore size A to pore size B (A/B) is greater than 0.01 and less than 1.
    Type: Application
    Filed: September 20, 2022
    Publication date: November 21, 2024
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Naomichi Sato, Norihisa Yamamoto, Masahiro Soga
  • Patent number: 12148917
    Abstract: A negative electrode for a non-aqueous electrolyte secondary battery includes a negative electrode material mixture including a negative electrode active material capable of electrochemically absorbing and desorbing lithium ions, a carbon nanotube; and an acrylic resin. The negative electrode active material includes a composite material including a silicate phase, and silicon particles dispersed in the silicate phase, and the silicate phase includes at least one selected from the group consisting of alkali metal elements and Group 2 elements.
    Type: Grant
    Filed: February 17, 2020
    Date of Patent: November 19, 2024
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Takahiro Fukuoka, Masaki Hasegawa, Masahiro Soga, Yuto Horiuchi, Takashi Yamamoto
  • Patent number: 11949091
    Abstract: A charging method of a non-aqueous electrolyte secondary battery involves a first charging step in which, defining x as the ratio of the capacity of a silicon compound to the rated capacity Q (0.1?x?0.5), charging is performed at a first fixed current value I1st that satisfies the expression below; and a high current charging step in which after completion of the first charging step, charging is performed at a fixed current value Imax higher than the first fixed current value I1st.
    Type: Grant
    Filed: January 25, 2019
    Date of Patent: April 2, 2024
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Masahiro Soga, Taisuke Yamamoto
  • Patent number: 11916220
    Abstract: A charging method of a non-aqueous electrolyte secondary battery involves a first charging step in which, defining x as the ratio of the capacity of a silicon compound to the rated capacity Q (0.1?x?0.5), charging is performed at a first fixed current value I1st that satisfies the expression below; and a high current charging step in which after completion of the first charging step, charging is performed at a fixed current value Imax higher than the first fixed current value I1st.
    Type: Grant
    Filed: January 25, 2019
    Date of Patent: February 27, 2024
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Masahiro Soga, Taisuke Yamamoto
  • Publication number: 20230361307
    Abstract: A secondary battery negative electrode according to the present invention is provided with a negative electrode mixture layer comprising: a negative electrode active material that contains an Si compound; and a binding material that includes cellulose nanofibers having a fiber diameter of 9 nm or less and a conductive material containing single-walled carbon nanotubes having a fiber diameter of less than 4 nm. The content of the cellulose nanofibers is greater than or equal to 0.005 mass % and less than 0.2 mass % in relation to the mass of the negative electrode active material.
    Type: Application
    Filed: September 15, 2021
    Publication date: November 9, 2023
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Norihisa Yamamoto, Masahiro Soga, Takashi Watanabe
  • Patent number: 11811255
    Abstract: A charging method of a non-aqueous electrolyte secondary battery involves a first charging step in which, defining x as the ratio of the capacity of a silicon compound to the rated capacity Q(0.1?x?0.5), a battery capacity Q1st that satisfies the expression below is charged at a first fixed current value; and a high current charging step in which, after completion of the first charging step, charging is performed at a fixed current value higher than the first fixed current value. 0.38x+0.063???Q1st/Q?0.38x+0.
    Type: Grant
    Filed: January 22, 2019
    Date of Patent: November 7, 2023
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Masahiro Soga, Taisuke Yamamoto
  • Publication number: 20230343942
    Abstract: This negative electrode for a secondary battery is provided with a negative electrode mixture layer comprising an Si compound-containing negative electrode active material, a conductive material and a binding material; the conductive material includes single-layer carbon nanotubes with a outermost diameter of at most 5 nm, and the binding material contains carboxymethyl cellulose salt with a weight average molecular weight of 150,000-450,000.
    Type: Application
    Filed: September 14, 2021
    Publication date: October 26, 2023
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Norihisa Yamamoto, Masahiro Soga
  • Publication number: 20230317950
    Abstract: A negative electrode for a non-aqueous electrolyte secondary battery includes a negative electrode mixture including a negative electrode active material capable of electrochemically absorbing and releasing lithium ions, carbon nanotubes, and a binder. The negative electrode active material includes a silicon-containing material, and the binder includes an acrylic polymer. The polymer includes a hydrophilic structural unit having a carboxyl group, and a hydrophobic structural unit.
    Type: Application
    Filed: June 24, 2021
    Publication date: October 5, 2023
    Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Norihisa Yamamoto, Nobuhiko Hojo, Masahiro Soga
  • Publication number: 20230216042
    Abstract: This negative electrode for nonaqueous electrolyte secondary batteries is provided with a negative electrode mixture layer that contains a negative electrode active material and carbon nanotubes. The negative electrode active material contains a first negative electrode active material and a second negative electrode active material; the first negative electrode active material and the second negative electrode active material contain lithium silicate phases, each of which contains lithium, silicon and oxygen, and silicon particles that are dispersed in the lithium silicate phases; the molar ratios of oxygen to silicon (O/Si) in the lithium silicate phases are different from each other; the carbon nanotubes have a diameter of from 1 nm to 5 nm; and the ratio of the mass of the first negative electrode active material relative to the total mass of the first negative electrode active material and the second negative electrode active material is 60% or less.
    Type: Application
    Filed: March 25, 2021
    Publication date: July 6, 2023
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Shunsuke Nambuya, Norihisa Yamamoto, Masahiro Soga
  • Publication number: 20230086333
    Abstract: A negative electrode for a nonaqueous electrolyte secondary battery includes a negative electrode mixture including a negative electrode active material capable of electrochemically storing and releasing lithium ions, a carbon nanotube, and an acrylic resin, wherein the negative electrode active material includes a silicon-containing material, and the carbon nanotube has an average diameter of 5 nm or less.
    Type: Application
    Filed: February 9, 2021
    Publication date: March 23, 2023
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Masahiro Soga, Norihisa Yamamoto
  • Publication number: 20220302451
    Abstract: A negative electrode for a secondary battery including a negative electrode active material capable of absorbing and releasing lithium ions. The negative electrode active material includes a first carbon material as a main component, and includes a second carbon material and a silicon-containing material which are present between particles of the first carbon material. The first carbon material has an average particle diameter A, the second carbon material has an average particle diameter B, and the silicon-containing material has an average particle diameter C, satisfying A>C?B.
    Type: Application
    Filed: July 21, 2020
    Publication date: September 22, 2022
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Masahiro Soga, Masaki Hasegawa, Takahiro Fukuoka
  • Publication number: 20220190320
    Abstract: A negative electrode for a non-aqueous electrolyte secondary battery includes a negative electrode material mixture including a negative electrode active material capable of electrochemically absorbing and desorbing lithium ions, a carbon nanotube; and an acrylic resin. The negative electrode active material includes a composite material including a silicate phase, and silicon particles dispersed in the silicate phase, and the silicate phase includes at least one selected from the group consisting of alkali metal elements and Group 2 elements.
    Type: Application
    Filed: February 17, 2020
    Publication date: June 16, 2022
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Takahiro Fukuoka, Masaki Hasegawa, Masahiro Soga, Yuto Horiuchi, Takashi Yamamoto
  • Publication number: 20220190314
    Abstract: A negative electrode for a non-aqueous electrolyte secondary battery includes a negative electrode mixture comprising a negative electrode active material capable of electrochemically absorbing and releasing lithium ions, a negative electrode additive, and an acrylic resin. The negative electrode active material includes a silicon containing material. The Negative electrode additive includes at least silicon dioxide and a group 2 element oxide, and the group 2 element oxide includes at least one selected from the group consisting of BeO, MgO, CaO, SrO, BaO and RaO. The acrylic resin includes at least a (meth)acrylic acid salt unit. The content of the group 2 element oxide in the negative electrode additive is less than 20 mass % relative to a total amount of the negative electrode additive.
    Type: Application
    Filed: March 11, 2020
    Publication date: June 16, 2022
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yohei Uchiyama, Taisuke Asano, Yosuke Sato, Masahiro Soga
  • Publication number: 20220158181
    Abstract: A negative electrode material mixture with a negative electrode active material including a Si-containing material and a carbon material; and a carbon nanotube. The Si-containing material includes, a first composite material in which Si particles are dispersed in a lithium silicate phase and/or a carbon phase, and a second composite material in which Si particles are dispersed in a SiO2 phase, at least the first composite material. A mass ratio X of the first composite material to a total of the first and second composite materials, and a mass ratio Y of the total of the first second composite materials to a total of the first composite material, the second composite material, and the carbon material satisfy a relational expression (1): 100Y?32.2X5+65.479X4?55.832X3+18.116X2?6.9275X?3.5356<0, X?1, and 0.06?Y. The non-aqueous electrolyte includes LiPF6 and LiN(SO2F)2.
    Type: Application
    Filed: March 2, 2020
    Publication date: May 19, 2022
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yukiho Okuno, Takahiro Fukuoka, Tasuku Ishiguro, Masahiro Soga
  • Publication number: 20200403220
    Abstract: A charging method of a non-aqueous electrolyte secondary battery involves a first charging step in which, defining x as the ratio of the capacity of a silicon compound to the rated capacity Q (0.1?x?0.5), charging is performed at a first fixed current value I1st that satisfies the expression below; and a high current charging step in which after completion of the first charging step, charging is performed at a fixed current value Imax higher than the first fixed current value I1st. 82/(81.8x+64)×(0.3/0.7)???I1st/Imax?82/(81.8x+64)×(0.3/0.7)+?(?=0.
    Type: Application
    Filed: January 25, 2019
    Publication date: December 24, 2020
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Masahiro Soga, Taisuke Yamamoto
  • Publication number: 20200403432
    Abstract: A charging method of a non-aqueous electrolyte secondary battery involves a first charging step in which, defining x as the ratio of the capacity of a silicon compound to the rated capacity Q(0.1?x?0.5), a battery capacity Q1st that satisfies the expression below is charged at a first fixed current value; and a high current charging step in which, after completion of the first charging step, charging is performed at a fixed current value higher than the first fixed current value. 0.38x+0.063???Q1st/Q?0.38x+0.
    Type: Application
    Filed: January 22, 2019
    Publication date: December 24, 2020
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Masahiro Soga, Taisuke Yamamoto
  • Patent number: D339801
    Type: Grant
    Filed: March 2, 1992
    Date of Patent: September 28, 1993
    Inventors: Atsuhiko Urushihara, Taisuke Kashima, Sumie Komuro, Hideo Nakazawa, Masahiro Soga