Patents by Inventor Mitsutoshi Otaki

Mitsutoshi Otaki 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: 10910666
    Abstract: Disclosed is a method for producing an all-solid-state lithium ion secondary battery being excellent in cycle characteristics. The production method may be a method for producing an all-solid-state lithium ion secondary battery, wherein the method comprises an anode mixture forming step of obtaining an anode mixture by drying a raw material for an anode mixture, which contains an anode active material, a solid electrolyte and an electroconductive material; and wherein, for the anode mixture after being dried in the anode mixture forming step, a voidage V of the inside of the anode mixture calculated by the following formula (1) is 43% or more and 54% or less: V=100?(D1/D0)×100??Formula (1).
    Type: Grant
    Filed: April 11, 2018
    Date of Patent: February 2, 2021
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Norihiro Ose, Hajime Hasegawa, Mitsutoshi Otaki, Yusuke Kintsu
  • Publication number: 20210020938
    Abstract: A main object of the present disclosure is to provide an active material wherein an expansion upon intercalation of a metal ion such as a Li ion is suppressed. The present disclosure achieves the object by providing an active material comprising a silicon clathrate type crystal phase, and the active material includes a Na element, a Si element and a M element that is a metal element with an ion radius larger than the Si element, and a proportion of the M element to a total of the Si element and the M element is 0.1 atm % or more and 5 atm % or less.
    Type: Application
    Filed: June 19, 2020
    Publication date: January 21, 2021
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroyuki YAMAGUCHI, Hironori DAIKOKU, Jun YOSHIDA, Kazuhiro SUZUKI, Mitsutoshi OTAKI
  • Patent number: 10847836
    Abstract: A method for producing a solid-state secondary battery system comprising a lithium ion solid-state battery that comprises a cathode, an anode and a solid electrolyte layer disposed between the cathode and the anode, and a controller for controlling charge and discharge voltages of the lithium ion solid-state battery in use, the method comprising: obtaining an anode member from an anode material which contains at least elemental Si particles serving as an anode active material and a fibrous carbon serving as a conductive additive material, and in which the contained fibrous carbon is 4.8 vol % or more, obtaining a battery member by disposing a solid electrolyte member between the anode member and a cathode member and attaching them, and carrying out initial constant current charging on the battery member, at a charge rate of 1.0 C or more, to a voltage higher than a maximum charge voltage controlled by the controller.
    Type: Grant
    Filed: February 21, 2019
    Date of Patent: November 24, 2020
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Mitsutoshi Otaki, Norihiro Ose, Shigenori Hama
  • Patent number: 10818977
    Abstract: A main object of the present disclosure is to provide a method for producing an all solid state battery capable of satisfying both of improving capacity durability and suppressing the increase of an initial resistance. The above object is achieved by providing a method for producing an all solid state battery, the method comprising: a preparing step of preparing an all solid state battery including a cathode layer, a solid electrolyte layer, and an anode layer, in this order; and an initial charging step of initially charging the all solid state battery, wherein the anode layer includes a metal particle capable of being alloyed with Li, and having two kinds or more of crystal orientation in one particle, as an anode active material, and in the initial charging step, the all solid state battery is charged to a battery voltage of 4.35 V or more and 4.55 V or less.
    Type: Grant
    Filed: April 8, 2019
    Date of Patent: October 27, 2020
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Mitsutoshi Otaki, Norihiro Ose, Shigenori Hama
  • Patent number: 10818975
    Abstract: [Problem] To provide a method for the production of an all-solid-state battery using an alloy-based negative electrode active material in which it is possible to suppress degradation in performance of the all-solid-state battery during actual use while the restraint pressure during actual use of the all-solid-state battery is relatively small. [Solving Means] The method for producing an all-solid-state battery of the present disclosure produces an all-solid-state battery having a battery laminate comprising a positive electrode current collector layer, a positive electrode active material layer, a solid electrolyte layer, a negative electrode active material layer, and a negative electrode current collector layer laminated in this order, wherein the battery laminate is restrained in the lamination direction by an actual use restraint member. The negative electrode active material layer contains particles of an alloy-based negative electrode active material.
    Type: Grant
    Filed: September 12, 2018
    Date of Patent: October 27, 2020
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Mitsutoshi Otaki, Norihiro Ose, Shigenori Hama
  • Patent number: 10777841
    Abstract: Disclosed is an all-solid-state lithium ion secondary battery excellent in cycle characteristics. The battery may be an all-solid-state lithium ion secondary battery, wherein an anode comprises anode active material particles, an electroconductive material and a solid electrolyte; wherein the anode active material particles comprise at least one active material selected from the group consisting of elemental silicon and SiO; and wherein, for the anode active material particles, a value A obtained by the following formula (1) is 6.1 or more and 54.8 or less: A=SBET×dmed×D??Formula (1) where SBET is a BET specific surface area (m2/g) of the anode active material particles; dmed is a median diameter D50 (?m) of the anode active material particles; and D is a density (g/cm3) of the anode active material particles.
    Type: Grant
    Filed: June 21, 2018
    Date of Patent: September 15, 2020
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Mitsutoshi Otaki, Norihiro Ose, Shigenori Hama, Kazuyuki Taniguchi, Yoshiyasu Yamada, Tetsuo Nakanishi
  • Patent number: 10714737
    Abstract: A main object of the present disclosure is to provide an all solid lithium battery with excellent capacity durability. The above object is achieved by providing an anode layer to be used in an all solid lithium battery, the anode layer comprising: a metal particle capable of being alloyed with Li, as an active material; and the metal particle has two kinds or more of crystal orientation in one particle.
    Type: Grant
    Filed: December 22, 2017
    Date of Patent: July 14, 2020
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Mitsutoshi Otaki, Norihiro Ose, Shigenori Hama
  • Patent number: 10658704
    Abstract: A method of manufacturing an electrode laminate, which includes an active material layer and a solid electrolyte layer formed on the active material layer, includes: an active material layer forming step of forming an active material layer; and a solid electrolyte layer forming step of forming a solid electrolyte layer on the active material layer by applying a solid electrolyte layer-forming slurry to the active material layer and drying the solid electrolyte layer-forming slurry. In this method, a surface roughness Ra value of the active material layer is 0.29 ?m to 0.98 ?m when calculated using a laser microscope.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: May 19, 2020
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kengo Haga, Junichiro Nishino, Norihiro Ose, Hajime Hasegawa, Mitsutoshi Otaki, Hiroki Kubo, Keisuke Omori
  • Patent number: 10651667
    Abstract: An all-solid-state battery system comprising an all-solid-state battery comprising a positive electrode active material layer, a solid electrolyte layer, and a negative electrode active material layer, and a control device configured to control a charge-discharge voltage during use of the all-solid-state battery. The negative electrode active material layer includes alloy negative electrode active material particles. The amorphization degree of the alloy negative electrode active material particles is in the range of 27.8% to 82.8% and a ratio Z/W is in the range of 0.32 to 0.60, where Z is a controlled discharge capacity of the all-solid-state battery, and W is a theoretical capacity of the alloy negative electrode active material particles × a total weight of the alloy negative electrode active material particles × the amorphization degree.
    Type: Grant
    Filed: July 16, 2018
    Date of Patent: May 12, 2020
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Mitsutoshi Otaki, Keisuke Omori, Norihiro Ose, Hajime Hasegawa, Kengo Haga
  • Patent number: 10637094
    Abstract: Disclosed is an anode mixture configured to provide an all-solid-state lithium ion secondary battery being excellent in cycle characteristics when it is used in the battery, an anode including the anode mixture, and an all-solid-state lithium ion secondary battery including the anode. The anode mixture may be an anode mixture for an all-solid-state lithium ion secondary battery, wherein the anode mixture contains an anode active material, a solid electrolyte and an electroconductive material; and wherein a value obtained by multiplying, by a bulk density of the solid electrolyte, a volume percentage (%) of the electroconductive material when a volume of the anode mixture is determined as 100 volume %, is 0.53 or more and 3.0 or less.
    Type: Grant
    Filed: April 11, 2018
    Date of Patent: April 28, 2020
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Norihiro Ose, Hajime Hasegawa, Yusuke Kintsu, Mitsutoshi Otaki
  • Publication number: 20200119396
    Abstract: Disclosed is an all-solid-state lithium ion secondary battery including an anode that contains, as an anode active material, at least one selected from the group consisting of a metal that is able to form an alloy with Li, an oxide of the metal, and an alloy of the metal and Li, and being excellent in cycle characteristics. The all-solid-state lithium ion secondary battery may be an all-solid-state lithium ion secondary battery, wherein an anode comprises an anode active material, an electroconductive material and a solid electrolyte; wherein the anode active material comprises at least one active material selected from the group consisting of a metal that is able to form an alloy with Li, an oxide of the metal, and an alloy of the metal and Li; and wherein the solid electrolyte is particles with a BET specific surface area of from 1.8 m2/g to 19.7 m2/g.
    Type: Application
    Filed: April 13, 2018
    Publication date: April 16, 2020
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Norihiro OSE, Hajime HASEGAWA, Mitsutoshi OTAKI, Yusuke KINTSU
  • Publication number: 20190319309
    Abstract: A main object of the present disclosure is to provide a method for producing an all solid state battery capable of satisfying both of improving capacity durability and suppressing the increase of an initial resistance. The above object is achieved by providing a method for producing an all solid state battery, the method comprising: a preparing step of preparing an all solid state battery including a cathode layer, a solid electrolyte layer, and an anode layer, in this order; and an initial charging step of initially charging the all solid state battery, wherein the anode layer includes a metal particle capable of being alloyed with Li, and having two kinds or more of crystal orientation in one particle, as an anode active material, and in the initial charging step, the all solid state battery is charged to a battery voltage of 4.35 V or more and 4.55 V or less.
    Type: Application
    Filed: April 8, 2019
    Publication date: October 17, 2019
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Mitsutoshi OTAKI, Norihiro OSE, Shigenori HAMA
  • Publication number: 20190267667
    Abstract: A method for producing a solid-state secondary battery system comprising a lithium ion solid-state battery that comprises a cathode, an anode and a solid electrolyte layer disposed between the cathode and the anode, and a controller for controlling charge and discharge voltages of the lithium ion solid-state battery in use, the method comprising: obtaining an anode member from an anode material which contains at least elemental Si particles serving as an anode active material and a fibrous carbon serving as a conductive additive material, and in which the contained fibrous carbon is 4.8 vol % or more, obtaining a battery member by disposing a solid electrolyte member between the anode member and a cathode member and attaching them, and carrying out initial constant current charging on the battery member, at a charge rate of 1.0 C or more, to a voltage higher than a maximum charge voltage controlled by the controller.
    Type: Application
    Filed: February 21, 2019
    Publication date: August 29, 2019
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Mitsutoshi Otaki, Norihiro Ose, Shigenori Hama
  • Patent number: 10396394
    Abstract: A method for producing a sulfide all-solid-state battery with a high capacity retention rate, and a sulfide all-solid-state battery with a high capacity retention rate. The method for producing a sulfide all-solid-state battery may comprise forming a sulfide all-solid-state battery, initially charging the sulfide all-solid-state battery after the forming of the sulfide all-solid-state battery, and exposing the sulfide all-solid-state battery to an oxygen-containing gas atmosphere at at least any one of a time of the initially charging of the sulfide all-solid-state battery and a time after the initially charging of the sulfide all-solid-state battery.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: August 27, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hajime Hasegawa, Norihiro Ose, Kengo Haga, Mitsutoshi Otaki, Keisuke Omori, Takeshi Tojigamori
  • Patent number: 10355267
    Abstract: A method is provided where an anode of an all-solid-state lithium ion secondary battery is easily doped with lithium and to provide a small resistance at a low battery capacity. The method includes a manufacturing method of a cathode including mixing at least a conductive assistant (C1) and a sulfide solid electrolyte (E1) to obtain a mixture; and mixing at least one cathode active material, a solid electrolyte (E2) and the mixture obtained from the first step to obtain a cathode mixture, wherein an amount of energy added to the sulfide solid electrolyte (E1) is larger than an amount of energy added to the solid electrolyte (E2), and the mixture is a material that releases lithium ions at a potential lower than a potential at which the cathode active material releases and occludes lithium ions. Manufacturing methods for a cathode and an all-solid-state lithium ion secondary battery including the cathode mixture are also disclosed.
    Type: Grant
    Filed: February 3, 2017
    Date of Patent: July 16, 2019
    Assignee: Toyota Jidosha Kabuhiki Kaisha
    Inventors: Norihiro Ose, Hikaru Aso, Keisuke Omori, Hajime Hasegawa, Mitsutoshi Otaki, Hideyuki Koga
  • Patent number: 10297874
    Abstract: A method of manufacturing an all-solid-state battery includes a lamination step of laminating a deactivated lithium-containing negative electrode active material layer containing deactivated lithium, a solid electrolyte layer for the all-solid-state battery, and a positive electrode active material layer for the all-solid-state battery such that the solid electrolyte layer for the all-solid-state battery is disposed between the deactivated lithium-containing negative electrode active material layer and the positive electrode active material layer for the all-solid-state battery.
    Type: Grant
    Filed: September 14, 2016
    Date of Patent: May 21, 2019
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Keisuke Omori, Hajime Hasegawa, Kengo Haga, Mitsutoshi Otaki, Norihiro Ose, Daichi Kosaka, Masato Hozumi
  • Publication number: 20190148765
    Abstract: [Problem] To provide a method for the production of an all-solid-state battery using an alloy-based negative electrode active material in which it is possible to suppress degradation in performance of the all-solid-state battery during actual use while the restraint pressure during actual use of the all-solid-state battery is relatively small. [Solving Means] The method for producing an all-solid-state battery of the present disclosure produces an all-solid-state battery having a battery laminate comprising a positive electrode current collector layer, a positive electrode active material layer, a solid electrolyte layer, a negative electrode active material layer, and a negative electrode current collector layer laminated in this order, wherein the battery laminate is restrained in the lamination direction by an actual use restraint member. The negative electrode active material layer contains particles of an alloy-based negative electrode active material.
    Type: Application
    Filed: September 12, 2018
    Publication date: May 16, 2019
    Inventors: Mitsutoshi OTAKI, Norihiro OSE, Shigenori HAMA
  • Publication number: 20190013542
    Abstract: Disclosed is an all-solid-state lithium ion secondary battery excellent in cycle characteristics. The battery may be an all-solid-state lithium ion secondary battery, wherein an anode comprises anode active material particles, an electroconductive material and a solid electrolyte; wherein the anode active material particles comprise at least one active material selected from the group consisting of elemental silicon and SiO; and wherein, for the anode active material particles, a value A obtained by the following formula (1) is 6.1 or more and 54.8 or less: A=SBET×dmed×D??Formula (1) where SBET is a BET specific surface area (m2/g) of the anode active material particles; dmed is a median diameter D50 (?m) of the anode active material particles; and D is a density (g/cm3) of the anode active material particles.
    Type: Application
    Filed: June 21, 2018
    Publication date: January 10, 2019
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Mitsutoshi OTAKI, Norihiro OSE, Shigenori HAMA, Kazuyuki TANIGUCHI, Yoshiyasu YAMADA, Tetsuo NAKANISHI
  • Publication number: 20190013541
    Abstract: Disclosed is an all-solid-state lithium ion secondary battery excellent in cycle characteristics. The battery may be an all-solid-state lithium ion secondary battery, wherein an anode comprises anode active material particles, an electroconductive material and a solid electrolyte; wherein the anode active material particles comprise at least one active material selected from the group consisting of elemental silicon and SiO; and wherein a BET specific surface area of the anode active material particles is 1.9 m2/g or more and 14.2 m2/g or less.
    Type: Application
    Filed: June 13, 2018
    Publication date: January 10, 2019
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Mitsutoshi OTAKI, Norihiro OSE, Shigenori HAMA, Kazuyuki TANIGUCHI, Yoshiyasu YAMADA, Tetsuo NAKANISHI
  • Patent number: 10128675
    Abstract: An all-solid-state battery system comprising an all-solid-state battery comprising a positive electrode active material layer, a solid electrolyte layer, and a negative electrode active material layer, and a control device configured to control a charge-discharge voltage during use of the all-solid-state battery. The negative electrode active material layer includes alloy negative electrode active material particles. The amorphization degree of the alloy negative electrode active material particles is in the range of 27.8% to 82.8% and a ratio Z/W is in the range of 0.32 to 0.60, where Z is a controlled discharge capacity of the all-solid-state battery, and W is a theoretical capacity of the alloy negative electrode active material particles×a total weight of the alloy negative electrode active material particles×the amorphization degree.
    Type: Grant
    Filed: September 14, 2016
    Date of Patent: November 13, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Mitsutoshi Otaki, Keisuke Omori, Norihiro Ose, Hajime Hasegawa, Kengo Haga