Patents by Inventor Masaru Kubota

Masaru Kubota 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: 20240213489
    Abstract: Disclosed is a method in which both the suppression of granulation of an active material and the acceleration of production steps are achieved when producing an electrode mixture containing a coated active material. The method comprises dropletizing a slurry containing an active material and a coating liquid to obtain slurry droplets, gas-flow drying the slurry droplets in a heating gas to obtain a first and a second precursor, and firing the first and the second precursor to obtain a first and second particle, wherein the first precursor contains the active material and a component from the coating liquid, the second precursor is free of the active material and contains a component from the coating liquid, the first particle has the active material and a coating layer, and the second particle is free of the active material and contains a component same as that constituting the coating layer.
    Type: Application
    Filed: January 26, 2024
    Publication date: June 27, 2024
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masaru Kubota, Kazuki Muraishi, Aiko Nagano
  • Publication number: 20240079574
    Abstract: A positive electrode for an all-solid-state battery that comprises a sulfide-based solid electrolyte and a covered active material. The covered active material includes a positive electrode active material particle and a coating film covering at least part of a surface of the positive electrode active material particle. The coating film includes a lithium-ion-conductive oxide, and also includes NOx at at least a surface thereof. A NOx content at the surface of the coating film is more than 1000 ppm.
    Type: Application
    Filed: July 6, 2023
    Publication date: March 7, 2024
    Inventors: Heidy Hodex VISBAL MENDOZA, Masaru KUBOTA, Nobuki KYONO
  • Publication number: 20240021797
    Abstract: A composite particle comprising: a positive electrode active material particle; and a coating film, wherein the coating film covers at least part of a surface of the positive electrode active material particle, and the coating film includes fluorine and at least one selected from the group consisting of phosphorus and a glass network forming element.
    Type: Application
    Filed: July 11, 2023
    Publication date: January 18, 2024
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHa
    Inventors: Masaru KUBOTA, Hidenori MIKI
  • Publication number: 20240021868
    Abstract: An electrode comprises a sulfide-based solid electrolyte and a composite particle. The sulfide-based solid electrolyte includes S and P, has a PS4 crystalline phase, and has a molar ratio of the PS4 crystalline phase to a total amount of phases consisting of P and S of 60% or more. The composite particle comprises a positive electrode active material particle and a coating film covering at least part of a surface of the positive electrode active material particle. The coating film includes a phosphorus compound. The phosphorus compound includes at least one of a first element (a glass network forming element) and a second element (a transition element) as well as phosphorus. In the coating film, a relationship of “expression (1): CLi/(CP+CE1+CE2)?2.5” is satisfied. CLi, CP, CE1, and CE2 represent element concentrations of respective elements measured by XPS.
    Type: Application
    Filed: April 7, 2023
    Publication date: January 18, 2024
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Heidy Hodex VISBAL MENDOZA, Masaru KUBOTA
  • Publication number: 20230420735
    Abstract: A solid-state battery having a low heat generation amount and low resistance, and a method for producing the same. The solid-state battery is a solid-state battery comprising: a cathode comprising a cathode layer that contains an oxide-based cathode active material, an anode comprising an anode layer that contains an anode active material, and a solid electrolyte layer being disposed between the cathode layer and the anode layer and containing a solid electrolyte, wherein at least any one of the cathode layer and the solid electrolyte layer contains a sulfide-based solid electrolyte, and wherein the sulfide-based solid electrolyte comprises a high oxygen concentration layer on a contact surface with the oxide-based cathode active material, the high oxygen concentration layer having a higher oxygen element concentration than other parts except the contact surface.
    Type: Application
    Filed: September 7, 2023
    Publication date: December 28, 2023
    Inventors: Jun YOSHIDA, Shinya SHIOTANI, Masaru KUBOTA, Yohei SHINDO, Takeshi USAMI
  • Publication number: 20230402645
    Abstract: An electrode comprises a sulfide-based solid electrolyte, an electrolyte microparticle, and a composite particle. The sulfide-based solid electrolyte includes S and P, has a PS4 crystalline phase, and has a molar ratio of the PS4 crystalline phase to a total amount of phases consisting of P and S of 60% or more. A ratio of a D50 of the electrolyte microparticle to a D50 of the sulfide-based solid electrolyte is 0.5 or less. The composite particle comprises a positive electrode active material particle and a coating film. The coating film includes a phosphorus compound. The phosphorus compound includes at least one of a first element (a glass network forming element) and a second element (a transition element) as well as phosphorus. In the coating film, a relationship of “expression (1): CLi(CP+CE1+CE2)?2.5” is satisfied. CLi, CP, CE1, and CE2 represent element concentrations of respective elements measured by XPS.
    Type: Application
    Filed: April 7, 2023
    Publication date: December 14, 2023
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Heidy Hodex VISBAL MENDOZA, Masaru KUBOTA
  • Publication number: 20230361280
    Abstract: A composite particle includes a positive electrode active material particle and a coating film. The positive electrode active material particle contains a lithium-containing composite oxide having a layered rock salt structure, and the coating film covers at least a part of a surface of the positive electrode active material particle. The coating film contains a phosphate compound, and satisfies a relationship of the following formula (1): XP/T ? 0.04 (1). In the above formula (1), XP indicates a mass fraction of phosphorus contained in the composite particle measured by inductively coupled plasma atomic emission spectroscopy, and T indicates a film thickness of the coating film measured by a scanning electron microscope.
    Type: Application
    Filed: January 23, 2023
    Publication date: November 9, 2023
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hideaki WATANABE, Masaru KUBOTA
  • Publication number: 20230343961
    Abstract: A composite particle includes a positive electrode active material particle and a coating film. In a method for producing the composite particle, the coating film covers at least a part of a surface of the positive electrode active material particle, the coating film contains a phosphorus compound, and a glass-transition temperature of the coating film is 300° C. or less.
    Type: Application
    Filed: February 1, 2023
    Publication date: October 26, 2023
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hideaki WATANABE, Masaru Kubota, Ryosuke FURUYA
  • Patent number: 11791497
    Abstract: A solid-state battery having a low heat generation amount and low resistance, and a method for producing the same. The solid-state battery is a solid-state battery comprising: a cathode comprising a cathode layer that contains an oxide-based cathode active material, an anode comprising an anode layer that contains an anode active material, and a solid electrolyte layer being disposed between the cathode layer and the anode layer and containing a solid electrolyte, wherein at least any one of the cathode layer and the solid electrolyte layer contains a sulfide-based solid electrolyte, and wherein the sulfide-based solid electrolyte comprises a high oxygen concentration layer on a contact surface with the oxide-based cathode active material, the high oxygen concentration layer having a higher oxygen element concentration than other parts except the contact surface.
    Type: Grant
    Filed: December 14, 2020
    Date of Patent: October 17, 2023
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Jun Yoshida, Shinya Shiotani, Masaru Kubota, Yohei Shindo, Takeshi Usami
  • Publication number: 20230322580
    Abstract: In a method for producing a coated active material, a coating layer containing niobium is formed on at least a part of a surface of an active material. The method includes: transforming a slurry containing the active material and a coating solution containing niobium into droplets to obtain slurry droplets; drying the slurry droplets in a heated gas stream to obtain a precursor; and baking the precursor. The active material that is used to obtain the slurry droplets contains less than 0.68 wt% of sulfur as an impurity.
    Type: Application
    Filed: February 16, 2023
    Publication date: October 12, 2023
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazuki MURAISHI, Masaru KUBOTA
  • Publication number: 20230327126
    Abstract: The conductive material is used for the positive electrode of the battery. The conductive material includes a substrate and a film. The film covers at least a portion of the surface of the substrate. The substrate comprises a conductive carbon material. The film includes a glass network forming element and oxygen.
    Type: Application
    Filed: February 2, 2023
    Publication date: October 12, 2023
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Heidy Hodex VISBAL MENDOZA, Masaru KUBOTA
  • Publication number: 20230303864
    Abstract: The coating liquid includes a solute and a solvent. The solute comprises a phosphoric acid compound and a lithium compound. The coating liquid has a pH of 2.5 to 10.7.
    Type: Application
    Filed: January 30, 2023
    Publication date: September 28, 2023
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Masaru Kubota
  • Publication number: 20230307645
    Abstract: The composite particle includes a positive electrode active material particle and a coating film. The coating film covers at least a part of a surface of the positive electrode active material particle. The coating film includes a phosphorus compound. The phosphorus compound includes at least one of Na and K and P.
    Type: Application
    Filed: January 24, 2023
    Publication date: September 28, 2023
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masaru KUBOTA, Shinji NAKANISHI
  • Publication number: 20230299292
    Abstract: A composite particle includes a positive electrode active material particle and a coating film. The coating film covers at least a part of a surface of the positive electrode active material particle. The coating film includes a phosphorus compound. The phosphorus compound includes either or both of a first element and a second element, and phosphorus. The first element is a glass network-forming element. The second element is a transition element. The relationship of CLi/(CP+CE1+CE2)?2.5 is satisfied, where CLi, CP, CE1, and CE2 represent elemental concentrations obtained by measuring the composite particle by X-ray photoelectron spectroscopy, CLi represents an elemental concentration of lithium, CP represents an elemental concentration of phosphorus, CE1 represents an elemental concentration of the first element, and CE2 represents an elemental concentration of the second element.
    Type: Application
    Filed: February 1, 2023
    Publication date: September 21, 2023
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Masaru KUBOTA
  • Publication number: 20230299272
    Abstract: A main object of the present disclosure is to provide a coated active material capable of reducing a battery resistance. The present disclosure achieves the object by providing a coated active material comprising: an active material including Ni, and a coating layer configured to coat at least a part of a surface of the active material, and a NiO layer is formed between the active material and the coating layer, and an average thickness of the NiO layer is 0.9 nm or less.
    Type: Application
    Filed: March 7, 2023
    Publication date: September 21, 2023
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, PANASONIC HOLDINGS CORPORATION
    Inventors: Kazuki MURAISHI, Masaru KUBOTA, Yusuke NISHIO, Kenji NAGAO
  • Publication number: 20230299283
    Abstract: In a method for producing a coated active material, a coating layer containing Nb is formed on at least a part of a surface of an active material. The method includes: transforming a slurry containing the active material and a coating solution containing Nb into droplets to obtain slurry droplets; drying the slurry droplets in a heated gas stream to obtain a precursor; and baking the precursor. When obtaining the slurry droplets, a temperature of the slurry before the slurry is transformed into droplets is 5° C. or more and less than 25° C.
    Type: Application
    Filed: February 27, 2023
    Publication date: September 21, 2023
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, Panasonic Holdings Corporation
    Inventors: Kazuki MURAISHI, Masaru KUBOTA, Izuru SASAKI, Kenji NAGAO
  • Publication number: 20230268510
    Abstract: A composite particle includes a positive electrode active material particle and a coating film. The coating film covers at least part of a surface of the positive electrode active material particle. The coating film includes a phosphorus compound. The composite particle satisfies a relationship of “CLi/CP?2.5”. “CLi” represents a concentration of Li element measured by XPS. “CP” represents a concentration of P element measured by XPS.
    Type: Application
    Filed: February 14, 2023
    Publication date: August 24, 2023
    Inventor: Masaru KUBOTA
  • Publication number: 20230265291
    Abstract: The coating liquid includes a solute and a solvent. The solute comprises a phosphoric acid compound. “I0/(I0+I1+I2)” is 0.7 or less. In the 31P-NMR spectrum, I0 indicates the area of the signal from the PO4, Q0 unit, I1 indicates the area of the signal from the PO4, Q1 unit, and I2 indicates the area of the signal from the PO4, Q2 unit.
    Type: Application
    Filed: December 20, 2022
    Publication date: August 24, 2023
    Inventor: Masaru KUBOTA
  • Publication number: 20230088894
    Abstract: Disclosed is a method in which both the suppression of granulation of an active material and the acceleration of production steps are achieved when producing an electrode mixture containing a coated active material. The method comprises dropletizing a slurry containing an active material and a coating liquid to obtain slurry droplets, gas-flow drying the slurry droplets in a heating gas to obtain a first and a second precursor, and firing the first and the second precursor to obtain a first and second particle, wherein the first precursor contains the active material and a component from the coating liquid, the second precursor is free of the active material and contains a component from the coating liquid, the first particle has the active material and a coating layer, and the second particle is free of the active material and contains a component same as that constituting the coating layer.
    Type: Application
    Filed: September 15, 2022
    Publication date: March 23, 2023
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masaru Kubota, Kazuki Muraishi, Aiko Nagano
  • Publication number: 20230051009
    Abstract: Provided is a lithium-containing oxide precursor solution for coating an electrode active material that is capable of improving the coverage of a coating layer that is formed by applying the lithium-containing oxide precursor solution to the surface of powder of the electrode active material and king it, and that is easy to handle in a normal atmosphere because a solution composed mainly of water is used as a solvent. The lithium-containing oxide precursor solution for coating an electrode active material includes Li in an amount of 0.1 mass % or more and 5.0 mass % or less, at least one element selected from Nb, F, Fe, P, Ta, V, Ge, B, Al, Ti, Si, W, Zr, Mo, S, Cl, Br, and I in an amount of 0.05 mass % or more and 35 mass % or less, and water in an amount of 60 mass % or more and 98.4 mass % or less. The value of absorbance of the solution at a wavelength of 660 nm is 0.1 or less, and the value of surface energy thereof is 72 mN/m or less.
    Type: Application
    Filed: August 1, 2022
    Publication date: February 16, 2023
    Applicants: DOWA ELECTRONICS MATERIALS CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masahiro YOSHIDA, Hidefumi FUJITA, Koji TANOUE, Kazuki MURAISHI, Masaru KUBOTA, Yuki ISHIGAKI