Patents by Inventor Norihisa Yamamoto

Norihisa Yamamoto 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: 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: 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: 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: 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: 12119481
    Abstract: A negative electrode active material for a secondary battery includes silicate composite particles each of which contain a silicate phase and silicon particles dispersed in the silicate phase, the silicate phase is an oxide phase containing Si, O, and alkali metals, the alkali metals include at least Na and Li, and an atomic ratio: Na/Li of Na to Li is 0.1 to 7.1.
    Type: Grant
    Filed: August 23, 2019
    Date of Patent: October 15, 2024
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Yohei Uchiyama, Norihisa Yamamoto, Keita Okazaki
  • Patent number: 12062788
    Abstract: This negative electrode active material for a secondary cell which is one aspect of the present disclosure comprises: a silicate phase that contains Li, Si, and Mx (Mx alkali metal, alkaline earth metal, and an element other than Si); silicon particles dispersed in the silicate phase; and oxide particles that contain Zr dispersed in the silicate phase. The content of each element with respect to the total of the elements other than oxygen in the silicate phase is 3 to 45 mol % for Li, 40 to 78 mol % for Si, and 1 to 40 mol % for Mx.
    Type: Grant
    Filed: January 21, 2019
    Date of Patent: August 13, 2024
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Yohei Uchiyama, Norihisa Yamamoto, Tatsuya Akira
  • Patent number: 11990606
    Abstract: A negative electrode active material for non-aqueous electrolyte secondary batteries, including: lithium silicate composite particles including a lithium silicate phase and silicon particles dispersed in the lithium silicate phase, the lithium silicate phase being an oxide phase including Li, Si, O, and M, where M is an element other than the following elements: Group 1 elements of alkali metals, Group 16 elements of oxygen group, Group 18 elements of rare gas, and Si. An amount of each element relative to a total amount of Li, Si and M in the lithium silicate phase is 3 to 55 mol % for Li, 25 mol % or more for Si, and 3 to 50 mol % for M. A carbon material is present inside the lithium silicate composite particles; and an area ratio of the carbon material occupying a cross section of the composite particles is 0.008 to 6%.
    Type: Grant
    Filed: October 29, 2018
    Date of Patent: May 21, 2024
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Yohei Uchiyama, Norihisa Yamamoto, Tatsuya Akira
  • Patent number: 11984604
    Abstract: A lithium ion battery including a negative electrode having a negative electrode active material layer that contains lithium silicate particles and a binder. The lithium silicate particles include composite particles including a lithium silicate phase and silicon particles dispersed in the lithium silicate phase, wherein a carbon material is present inside the composite particles, and an area ratio of the carbon material occupying a cross section of the composite particles is 0.008 to 6%. The binder includes at least a first resin, wherein the first resin is at least cue selected from the group consisting of polyacrylic acid, a polyacrylic acid salt, and their derivatives. The first resin is contained in an amount of 2 mass % or less in the negative electrode active material layer.
    Type: Grant
    Filed: October 26, 2018
    Date of Patent: May 14, 2024
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Yohei Uchiyama, Taisuke Yamamoto, Tatsuya Akira, Norihisa Yamamoto, Hiroshi Minami
  • Patent number: 11936034
    Abstract: A negative electrode active substance particle according to one embodiment of the present invention, comprises a mother particle that has: a silicate phase that includes Na, Si, and at least one element selected from M, M1, M2, M3 and M4 (M is an alkali earth metal, and M1, M2, M3 and M4 are elements other than alkali metals, alkali earth metals or Si); and silicon particles dispersed in the silicate phase. The contents of the elements in the silicate phase are: 9-52 mol % of Na; 3-50 mol % of M, M1, M2, M3 and M4; and at least 25 mol % of Si.
    Type: Grant
    Filed: December 26, 2018
    Date of Patent: March 19, 2024
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Yohei Uchiyama, Norihisa Yamamoto, Tatsuya Akira
  • Publication number: 20240047686
    Abstract: A negative electrode material for a secondary battery includes a negative electrode active material and a carbon nanotube, wherein the negative electrode active material includes graphite and a material including a silicon element, and the carbon nanotube has an average fiber diameter of 0.5 nm to 6 nm and an average fiber length of 1.2 ?m to 8 ?m. A secondary battery includes a negative electrode including the negative electrode material for a secondary battery, a positive electrode, a separator interposed between the positive electrode and the negative electrode, and an electrolyte.
    Type: Application
    Filed: December 23, 2021
    Publication date: February 8, 2024
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Masaki Hasegawa, Norihisa Yamamoto, Takashi Watanabe
  • 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
  • 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
  • Patent number: 11715822
    Abstract: Negative electrode active material particles comprise base particles having: a silicate phase containing Li2O, SiO2, at least one oxide selected from M12O3, M2O2, M32O5, and M4O3 (where M1, M2, M3, and M4 are elements other than alkali metals, alkali earth metals, and Si), and a discretionary component MO (where M is an alkali earth metal); and silicon particles dispersed in the silicate phase. The element contents for the elements contained in the silicate phase are: 3-33 mol % of Li; 40-78 mol % of S; and 1-40 mol % of M1, M2, M3, and M4. If MO is contained, the M content in the silicate phase is 1-10 mol %.
    Type: Grant
    Filed: September 26, 2018
    Date of Patent: August 1, 2023
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Norihisa Yamamoto, Yohei Uchiyama, Tatsuya Akira, Kazuro Hayashida
  • 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
  • Patent number: 11670772
    Abstract: Negative electrode active material particles according to the present invention have composite particles that include: a sodium silicate phase with a Vickers hardness of 150 Hv or greater, and silicon particles dispersed in the sodium silicate phase.
    Type: Grant
    Filed: October 26, 2018
    Date of Patent: June 6, 2023
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Yohei Uchiyama, Norihisa Yamamoto, Tatsuya Akira, Kazuro Hayashida
  • 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
  • Patent number: 11271197
    Abstract: Disclosed is a negative electrode material for a non-aqueous electrolyte secondary battery, including: a lithium silicate phase; silicon particles dispersed in the lithium silicate phase; and at least one element Me dispersed in the lithium silicate phase, and selected from the group consisting of a rare-earth element and an alkaline-earth metal. The composition of the lithium silicate phase is represented, for example, by the formula: Li2zSiO2+z, and satisfies 0<z<2, and the element Me is dispersed in the lithium silicate phase, for example, as an Me oxide.
    Type: Grant
    Filed: February 16, 2018
    Date of Patent: March 8, 2022
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Taisuke Asano, Yohei Uchiyama, Taisuke Yamamoto, Tatsuya Akira, Norihisa Yamamoto, Hiroshi Minami
  • Publication number: 20210384496
    Abstract: In the present invention, negative electrode active material particles for a nonaqueous electrolyte secondary battery which can suppress decrease of charging and discharging cycle characteristics, are each provided with: a composite particle that includes a silicate phase and silicon particles dispersed in the silicate phase; and a surface layer that covers the composite particle, wherein the surface layer includes a fluorine resin.
    Type: Application
    Filed: October 17, 2019
    Publication date: December 9, 2021
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Keita Okazaki, Norihisa Yamamoto
  • Patent number: 11196040
    Abstract: Disclosed is a negative electrode material including: a lithium silicate phase that contains a lithium silicate; and silicon particles that are dispersed in the lithium silicate phase, wherein the silicon particles have a crystallite size of 10 nm or more, and the lithium silicate has a composition represented by the following formula: Li2Si2O5.(x?2)SiO2, where 2<x?18 is satisfied.
    Type: Grant
    Filed: November 17, 2017
    Date of Patent: December 7, 2021
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Yohei Uchiyama, Taisuke Yamamoto, Tatsuya Akira, Norihisa Yamamoto, Hiroshi Minami