Patents by Inventor Taira Aida

Taira Aida 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: 11121368
    Abstract: An object of the present invention is to provide a positive electrode material for a nonaqueous electrolyte secondary battery, which is capable of inhibiting the gelation of a positive electrode composite material paste without decreasing the charge and discharge capacity and the output characteristics, when used as a positive electrode material for batteries. The positive electrode active material for a nonaqueous electrolyte secondary battery comprises a mixture containing a lithium metal composite oxide represented by a general formula LiaNi1-x-y-zCoxMnyMzO2 (wherein, 0.03?x?0.35, 0?y?0.35, 0?z?0.05, 0.97?a?1.30, and M is at least one type of element selected from V, Fe, Cu, Mg, Mo, Nb, Ti, Zr, W and Al) and an ammonium tungstate powder, wherein when 5 g of the positive electrode material is mixed with 100 ml of pure water, the mixture is stirred for 10 minutes and then left to stand for 30 minutes, and then the pH of a supernatant fluid at 25° C. was measured, the pH ranges from 11.2 to 11.8.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: September 14, 2021
    Assignee: SUMITOMO METAL MINING CO., LTD.
    Inventors: Koji Yamaji, Taira Aida, Ryozo Ushio
  • Patent number: 11108042
    Abstract: A positive electrode composite material for a lithium ion secondary battery that makes it possible to appropriately reduce the electric resistance in a positive electrode and to realize a high-performance lithium ion secondary battery. The positive electrode composite material to be used in the positive electrode of the lithium ion secondary battery includes a particulate positive electrode active material composed of a lithium composite oxide having a layered crystal structure including at least lithium, and a conductive oxide. Here, a particulate region where primary particles of the conductive oxide are aggregated, and a film-shaped region where the conductive oxide is formed in a film shape adhere to at least a part of the surface of the positive electrode active material. The average particle diameter based on cross-sectional TEM observation of primary particles in the particulate region is equal to or greater than 0.
    Type: Grant
    Filed: February 8, 2018
    Date of Patent: August 31, 2021
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, SUMITOMO METAL MINING CO., LTD.
    Inventors: Daisuke Horikawa, Ryuta Sugiura, Taira Aida, Satoshi Kanada
  • Patent number: 11024839
    Abstract: A transition metal-containing composite hydroxide comprises secondary particles having: a center portion of fine primary particles; and an outer-shell portion having a high-density layer of plate-shaped primary particles formed outside the center portion, a low-density layer of the fine primary particles formed outside the high-density layer, and an outer-shell layer of the plate-shaped primary particles formed outside the low-density layer. The composite hydroxide is obtained by a method comprising a nucleation step in an oxidizing atmosphere and a particle growth step, the particle growth step comprising: a first stage of maintaining the oxidizing atmosphere; a second stage of switching to and maintaining a non-oxidizing atmosphere; a third stage of switching again to and maintaining the oxidizing atmosphere; and a fourth stage of switching again to and maintaining the non-oxidizing atmosphere.
    Type: Grant
    Filed: November 21, 2017
    Date of Patent: June 1, 2021
    Assignee: SUMITOMO METAL MINING CO., LTD.
    Inventors: Takahiro Toma, Hiroko Senba, Taira Aida, Tetsufumi Komukai
  • Patent number: 11018335
    Abstract: A positive electrode for a lithium ion secondary battery includes a positive electrode composite material layer. The positive electrode composite material layer includes composite particles and electron conductive particles. The composite particles include positive electrode active material particles and a coating film. The coating film is formed on the surface of the positive electrode active material particles. The coating film contains a first electron conductive oxide. The electron conductive particles are dispersed in the positive electrode composite material layer. The electron conductive particles contain a second electron conductive oxide. Each of the first electron conductive oxide and the second electron conductive oxide has a perovskite structure.
    Type: Grant
    Filed: April 17, 2018
    Date of Patent: May 25, 2021
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, SUMITOMO METAL MINING CO., LTD.
    Inventors: Daisuke Horikawa, Ryuta Sugiura, Satoshi Kanada, Tetsutaro Hayashi, Taira Aida
  • Patent number: 10971720
    Abstract: A positive electrode active material includes secondary particles. The secondary particles include a plurality of primary particles. The primary particles include a lithium-containing composite metal oxide. Inside the secondary particles, an electron conducting oxide is disposed at at least a part of a grain boundary between the primary particles. The electron conducting oxide has a perovskite structure.
    Type: Grant
    Filed: April 16, 2018
    Date of Patent: April 6, 2021
    Assignees: Toyota Jidosha Kabushiki Kaisha, Sumitomo Metal Mining Co., Ltd.
    Inventors: Ryuta Sugiura, Satoshi Kanada, Tetsutaro Hayashi, Taira Aida
  • Publication number: 20200358093
    Abstract: The present invention provides a composite oxide that can achieve a high low-temperature output characteristic, a method for manufacturing the same, and a positive electrode active material in which the generation of soluble lithium is suppressed and a problem of gelation is not caused during the paste preparation. A positive electrode active material for non-aqueous electrolyte secondary batteries, including a lithium-metal composite oxide powder including a secondary particle configured by aggregating primary particles containing lithium, nickel, manganese, and cobalt, or a lithium-metal composite oxide powder including both the primary particles and the secondary particle. The secondary particle has a porous structure inside as a main inside structure, the slurry pH is 11.5 or less, the soluble lithium content rate is 0.5[% by mass] or less, the specific surface area is 3.0 to 4.0 [m2/g], and the porosity is more than 50 to 80[%].
    Type: Application
    Filed: July 31, 2018
    Publication date: November 12, 2020
    Inventors: Hiroko Oshita, Kazuomi Ryoshi, Taira Aida, Koji Yamaji, Jiro Okada
  • Publication number: 20200350565
    Abstract: The present invention provides a composite oxide that can achieve a high low-temperature output characteristic, a method for manufacturing the same, and a positive electrode active material in which the generation of soluble lithium is suppressed and a problem of gelation is not caused during the paste preparation. A positive electrode active material for non-aqueous electrolyte secondary batteries, including a lithium-metal composite oxide powder including a secondary particle configured by aggregating primary particles containing lithium, nickel, manganese, and cobalt, or a lithium-metal composite oxide powder including both the primary particles and the secondary particle, wherein the secondary particle has a hollow structure inside as a main inside structure, the slurry pH is 11.5 or less, the soluble lithium content rate is 0.5 [96 by mass] or less, the specific surface area is 2.0 to 3.0 [m2/g], and the porosity is 20 to 50 [96].
    Type: Application
    Filed: July 31, 2018
    Publication date: November 5, 2020
    Inventors: Hiroko Oshita, Kazuomi Ryoshi, Taira Aida, Koji Yamaji, Jiro Okada
  • Publication number: 20200335781
    Abstract: The present invention provides a lithium-nickel-manganese-cobalt composite oxide in which the reactivity between a lithium raw material and a metal composite hydroxide is improved so that a high low-temperature output characteristic can be achieved, a method for manufacturing the composite oxide, and a positive electrode active material and the like without causing a problem of gelation during the paste preparation. A positive electrode active material for non-aqueous electrolyte secondary batteries, including a lithium-metal composite oxide powder including a secondary particle configured by aggregating primary particles containing lithium, nickel, manganese, and cobalt, or a lithium-metal composite oxide powder including both the primary particles and the secondary particle. The secondary particle has a solid structure inside as a main inside structure, the slurry pH is 11.5 or less, the soluble lithium content rate is 0.5 [% by mass] or less, and the specific surface area is 1.0 to 2.0 [m2/g].
    Type: Application
    Filed: July 31, 2018
    Publication date: October 22, 2020
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Hiroko Oshita, Kazuomi Ryoshi, Taira Aida, Koji Yamaji, Jiro Okada
  • Publication number: 20200227732
    Abstract: A positive electrode active material for a non-aqueous electrolyte secondary battery includes a lithium metal composite oxide, wherein the lithium metal composite oxide is represented by a general formula: LiaNi1?x?y?zCoxDyEzO2 (wherein, in the formula, 0.05?x?0.35, 0?y?0.35, 0.002?z?0.05, 1.00?a?1.30, an element D is at least one type of element selected from Mn, V, Mo, Nb, Ti, and W, and an element E is an element forming an alloy with lithium at a potential more noble than a potential in which ions of the element E are reduced), wherein the lithium metal composite oxide includes primary and secondary particles formed by aggregating the primary particles, wherein an oxide containing the element E exists at a surface of at least either of the primary and secondary particles.
    Type: Application
    Filed: June 27, 2018
    Publication date: July 16, 2020
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Takahiro TOMA, Atsushi FUKUI, Taira AIDA, Tetsufumi KOMUKAI
  • Publication number: 20200161644
    Abstract: Provided is a positive electrode active material that is capable of simultaneously improving the battery capacity, output characteristics and cycling characteristics of a secondary battery. When obtaining a transition metal-containing composite hydroxide that is a precursor to the positive electrode active material, by adjusting the pH value of a reaction aqueous solution to be within the range 12.0 to 14.0 and performing generation of nuclei (nucleation), and then adjusting the pH value of the reaction aqueous solution to be within the range 10.5 to 12.
    Type: Application
    Filed: December 10, 2019
    Publication date: May 21, 2020
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Takahiro TOMA, Taira AIDA, Tetsufumi KOMUKAI, Yasutaka KAMATA
  • Patent number: 10601036
    Abstract: Provided is a precursor of a positive electrode active material containing, in a reduced amount, impurities which do not contribute to a charge/discharge reaction but rather corrode a firing furnace and peripheral equipment and thus having excellent battery characteristics and safety, and production method thereof. A method for producing a precursor of a positive electrode active material for nonaqueous electrolyte secondary batteries having a hollow structure or porous structure includes obtaining the precursor by washing nickel-manganese composite hydroxide particles having a particular composition ratio and a pore structure in which pores are present within the particles with an aqueous carbonate solution having a carbonate concentration of 0.1 mol/L or more.
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: March 24, 2020
    Assignee: SUMITOMO METAL MINING CO., LTD.
    Inventors: Taira Aida, Hiroyuki Toya
  • Publication number: 20200058936
    Abstract: A positive electrode composite material for a lithium ion secondary battery that makes it possible to appropriately reduce the electric resistance in a positive electrode and to realize a high-performance lithium ion secondary battery. The positive electrode composite material to be used in the positive electrode of the lithium ion secondary battery includes a particulate positive electrode active material composed of a lithium composite oxide having a layered crystal structure including at least lithium, and a conductive oxide. Here, a particulate region where primary particles of the conductive oxide are aggregated, and a film-shaped region where the conductive oxide is formed in a film shape adhere to at least a part of the surface of the positive electrode active material. The average particle diameter based on cross-sectional TEM observation of primary particles in the particulate region is equal to or greater than 0.
    Type: Application
    Filed: February 8, 2018
    Publication date: February 20, 2020
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, SUMITOMO METAL MINING CO., LTD.
    Inventors: Daisuke HORIKAWA, Ryuta SUGIURA, Taira AIDA, Satoshi KANADA
  • Patent number: 10547052
    Abstract: The presently disclosed subject matter is directed to transition metal-containing composite hydroxides, their use, and manufacturing methods thereof. More particularly, the subject matter describes a positive electrode active material for a non-aqueous electrolyte secondary battery that uses a transition metal-containing composite hydroxide as a precursor and a manufacturing method thereof. In some embodiments, the non-aqueous electrolyte secondary battery uses a positive electrode active material for a non-aqueous electrolyte secondary battery as a positive electrode material.
    Type: Grant
    Filed: June 9, 2016
    Date of Patent: January 28, 2020
    Assignee: SUMITOMO METAL MINING CO., LTD.
    Inventors: Takahiro Toma, Taira Aida, Tetsufumi Komukai, Yasutaka Kamata
  • Publication number: 20200006770
    Abstract: Provided is a cathode active material that can simultaneously improve the capacity characteristics, output characteristics, and cycling characteristics of a rechargeable battery when used as cathode material for a non-aqueous electrolyte rechargeable battery. After performing nucleation by controlling an aqueous solution for nucleation that includes a metal compound that includes at least a transition metal and an ammonium ion donor so that the pH value becomes 12.0 to 14.0 (nucleation process), nuclei are caused to grow by controlling aqueous solution for particle growth that includes the nuclei so that the pH value is less than in the nucleation process and is 10.5 to 12.0 (particle growth process).
    Type: Application
    Filed: August 13, 2019
    Publication date: January 2, 2020
    Inventors: Yasutaka KAMATA, Taira AIDA, Hiroyuki TOYA
  • Publication number: 20190379043
    Abstract: A positive electrode active material and its precursor capable of further improving output characteristics while maintaining capacity characteristics and cycle characteristics of a positive electrode active material having the solid structure is provided.
    Type: Application
    Filed: November 21, 2017
    Publication date: December 12, 2019
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Takahiro TOMA, Taira AIDA, Tetsufumi KOMUKAI
  • Publication number: 20190379038
    Abstract: A transition metal-containing composite hydroxide comprises secondary particles having: a center portion of fine primary particles; and an outer-shell portion having a high-density layer of plate-shaped primary particles formed outside the center portion, a low-density layer of the fine primary particles formed outside the high-density layer, and an outer-shell layer of the plate-shaped primary particles formed outside the low-density layer. The composite hydroxide is obtained by a method comprising a nucleation step in an oxidizing atmosphere and a particle growth step, the particle growth step comprising: a first stage of maintaining the oxidizing atmosphere; a second stage of switching to and maintaining a non-oxidizing atmosphere; a third stage of switching again to and maintaining the oxidizing atmosphere; and a fourth stage of switching again to and maintaining the non-oxidizing atmosphere.
    Type: Application
    Filed: November 21, 2017
    Publication date: December 12, 2019
    Inventors: Takahiro TOMA, Hiroko SENBA, Taira AIDA, Tetsufumi KOMUKAI
  • Publication number: 20190372090
    Abstract: Provided is a positive electrode material that allows reducing battery resistance. The positive electrode material disclosed herein has particles of a positive electrode active material, each having a void communicating between the surface and at least the interior; and an electronic conductor present on the surface of the particles of the positive electrode active material. The positive electrode active material has a layered rock salt structure, and has a composition represented by Formula (I) below. The electronic conductor has a composition represented by Formula (II) below, Li1+uNixMnyCozMtO2??(I) La1?pMapCo1?qMbqO3????(II) wherein the symbols in the formulas are as defined in the specification.
    Type: Application
    Filed: May 13, 2019
    Publication date: December 5, 2019
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, SUMITOMO METAL MINING CO., LTD.
    Inventors: Ryuta SUGIURA, Taira AIDA, Tetsutaro HAYASHI, Satoshi KANADA
  • Publication number: 20190372119
    Abstract: A positive electrode active material for a non-aqueous electrolyte secondary battery that can improve the output characteristics without deteriorating its battery capacity and cycling characteristics. The positive electrode active material comprises a lithium transition metal-containing composite oxide comprising secondary particles that are constructed by an aggregation of a plurality of primary particles. The secondary particles comprise an outer shell section where the primary particles are aggregated, a center section constructed by an inner space existing inside the outer shell section, and at least one through-hole formed in the outer shell section and communicating the center section and outside, and the ratio of the inner diameter of the through-hole with respect to the thickness of the outer shell section is 0.3 or more.
    Type: Application
    Filed: November 22, 2017
    Publication date: December 5, 2019
    Inventors: Takahiro TOMA, Taira AIDA, Tetsufumi KOMUKAI, Ryuta SUGIURA
  • Publication number: 20190341610
    Abstract: Provided is a precursor of a positive electrode active material containing, in a reduced amount, impurities which do not contribute to a charge/discharge reaction but rather corrode a firing furnace and peripheral equipment and thus having excellent battery characteristics and safety, and production method thereof. A method for producing a precursor of a positive electrode active material for nonaqueous electrolyte secondary batteries having a hollow structure or porous structure includes obtaining the precursor by washing nickel-manganese composite hydroxide particles having a particular composition ratio and a pore structure in which pores are present within the particles with an aqueous carbonate solution having a carbonate concentration of 0.1 mol/L or more.
    Type: Application
    Filed: July 12, 2019
    Publication date: November 7, 2019
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Taira Aida, Hiroyuki Toya
  • Patent number: 10424787
    Abstract: Provided is a cathode active material that can simultaneously improve the capacity characteristics, output characteristics, and cycling characteristics of a rechargeable battery when used as cathode material for a non-aqueous electrolyte rechargeable battery. After performing nucleation by controlling an aqueous solution for nucleation that includes a metal compound that includes at least a transition metal and an ammonium ion donor so that the pH value becomes 12.0 to 14.0 (nucleation process), nuclei are caused to grow by controlling aqueous solution for particle growth that includes the nuclei so that the pH value is less than in the nucleation process and is 10.5 to 12.0 (particle growth process).
    Type: Grant
    Filed: May 12, 2014
    Date of Patent: September 24, 2019
    Assignee: SUMITOMO METAL MINING CO., LTD.
    Inventors: Yasutaka Kamata, Taira Aida, Hiroyuki Toya