Patents by Inventor Kazuomi Ryoshi

Kazuomi Ryoshi 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: 11063258
    Abstract: A method for producing a nickel-containing hydroxide is provided that includes a particle growth step of promoting growth of nickel-containing hydroxide particles by neutralization crystallization in an aqueous solution accommodated in an agitation tank. In the particle growth step, a volume fraction of a highly supersaturated region in the aqueous solution where the molar concentration of the nickel-containing hydroxide dissolved in the aqueous solution is greater than or equal to 1.7 mol/m3 is less than 0.624% of the aqueous solution.
    Type: Grant
    Filed: June 12, 2017
    Date of Patent: July 13, 2021
    Assignee: SUMITOMO METAL MINING CO., LTD.
    Inventors: Shuhei Nakakura, Kazuhiko Tsuchioka, Koichiro Maki, Motoaki Saruwatari, Kazuomi Ryoshi, Yoshihiko Nakao
  • Patent number: 11024836
    Abstract: The present invention has an object to provide a positive electrode active material for a non-aqueous electrolyte secondary battery which not only suppresses gelation of a positive electrode mixed material paste upon producing the non-aqueous electrolyte secondary battery but also improves the stability thereof. Provided is the positive electrode active material represented by general formula LisNi1?x?y?zCoxMnyMzO2+? (0?x?0.35, 0?y?0.35, 0?z?0.10, 0.95<s<1.30, and 0???0.2, and M represents at least one element selected from V, Mg, Mo, Nb, Ti, W, and Al) and containing secondary particles formed by agglomeration of primary particles, wherein at least part of the surface of the primary particles thereof is covered with a lithium boron compound, and the amount of redundant lithium hydroxide of the positive electrode active material measured with a neutralization titration is at least 0.003% by mass and up to 0.5% by mass relative to the total of the positive electrode active material.
    Type: Grant
    Filed: May 12, 2017
    Date of Patent: June 1, 2021
    Assignee: SUMITOMO METAL MINING CO., LTD.
    Inventors: Motoaki Saruwatari, Kazuomi Ryoshi
  • Patent number: 10978711
    Abstract: A positive electrode active material for a nonaqueous electrolyte secondary battery contains a first lithium-metal composite oxide represented by General Formula: Lis1Ni1-x1-y1-z1Cox1Mny1Mz1O2+? and containing a secondary particle formed of a plurality of flocculated primary particles and either one or both of a first compound containing lithium and boron and a second compound containing lithium and tungsten. Either one or both of the following characteristics (1) and (2) are satisfied: (1) the first compound covers surfaces of the primary particles, and a boron content is at least 0.01% by mass and up to 0.5% by mass relative to the entire positive electrode active material; and (2) the second compound covers the surfaces of the primary particles, and a tungsten content is at least 0.01% by mass and up to 1.0% by mass relative to the entire positive electrode active material.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: April 13, 2021
    Assignee: SUMITOMO METAL MINING CO., LTD.
    Inventors: Yoshihiro Otsuka, Motoaki Saruwatari, Kazuomi Ryoshi
  • Publication number: 20210074990
    Abstract: A method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries is disclosed which includes cleaning a powder formed of a lithium-nickel composite oxide represented by a general formula LizNi1-x-yCoxMyO2 where 0?x?0.35; 0?y?0.10; 0.95?z?1.10; and M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al with an aqueous lithium carbonate solution and drying the cleaned powder.
    Type: Application
    Filed: November 19, 2020
    Publication date: March 11, 2021
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Hiroko Oshita, Kazuomi Ryoshi
  • Publication number: 20210066715
    Abstract: A cathode active material for a non-aqueous electrolyte secondary battery containing a lithium metal composition oxide powder, wherein the lithium metal composition oxide powder is represented by a general formula: LizNi1?x?y?tCoxAlyMtO2+? (where 0<x?0.15, 0<y?0.07, 0?t?0.1, x+y+t?0.16, 0.95?z?1.03, 0???0.15), and M is one or more elements selected from Mg, Ca, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W), and wherein Al/(Ni+Co), which is a mass ratio of Al relative to Ni+Co in the lithium metal composition oxide powder after the lithium metal composition oxide powder of 1 kg is water washed of 750 mL, is 90% or higher of that of the lithium metal composition oxide powder before water washing.
    Type: Application
    Filed: August 31, 2018
    Publication date: March 4, 2021
    Inventors: Tomoko NAKAYAMA, Takahiro TOMA, Takahiro OGAWA, Kazuomi RYOSHI
  • Publication number: 20210013509
    Abstract: A positive electrode active material for non-aqueous electrolyte secondary batteries includes a lithium-nickel composite oxide particle and a coating layer attached to at least a part of a surface of the particle. The lithium-nickel composite oxide particle contains boron therein, and the coating layer contains a titanium compound.
    Type: Application
    Filed: March 20, 2019
    Publication date: January 14, 2021
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Yoshihiro Otsuka, Kazuomi Ryoshi, Hiroko Oshita, Shuuzou Ozawa
  • Publication number: 20200381729
    Abstract: Provided is a precursor of a positive electrode active material for non-aqueous electrolyte secondary batteries which allows a non-aqueous electrolyte secondary battery to have excellent battery characteristics. A manganese composite hydroxide is obtained by adjusting the pH value of an aqueous solution for nucleation containing cobalt and/or manganese to 7.5 to 11.1 on the basis of a liquid temperature of 25° C. to form plate-shaped crystal nuclei, and adjusting the pH value of a slurry for particle growth containing the plate-shaped crystal nuclei to 10.5 to 12.5 on the basis of a liquid temperature of 25° C., and supplying a mixed aqueous solution including a metal compound containing at least manganese to the slurry, thereby performing particle growth of the plate-shaped crystal nuclei.
    Type: Application
    Filed: August 19, 2020
    Publication date: December 3, 2020
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Kazuomi RYOSHI, Kensaku MORI
  • Patent number: 10840511
    Abstract: Provided is a precursor of a positive electrode active material for non-aqueous electrolyte secondary batteries which allows a non-aqueous electrolyte secondary battery to have excellent battery characteristics. A manganese composite hydroxide is obtained by adjusting the pH value of an aqueous solution for nucleation containing cobalt and/or manganese to 7.5 to 11.1 on the basis of a liquid temperature of 25° C. to form plate-shaped crystal nuclei, and adjusting the pH value of a slurry for particle growth containing the plate-shaped crystal nuclei to 10.5 to 12.5 on the basis of a liquid temperature of 25° C., and supplying a mixed aqueous solution including a metal compound containing at least manganese to the slurry, thereby performing particle growth of the plate-shaped crystal nuclei.
    Type: Grant
    Filed: April 2, 2015
    Date of Patent: November 17, 2020
    Assignee: SUMITOMO METAL MINING CO., LTD.
    Inventors: Kazuomi Ryoshi, Kensaku Mori
  • Publication number: 20200358094
    Abstract: An object is to provide a positive electrode active material for a non-aqueous electrolyte secondary battery that can suppress gelation of a positive electrode mixture paste and can improve stability when a non-aqueous electrolyte secondary battery is manufactured. A positive electrode active material for a non-aqueous electrolyte secondary battery has a hexagonal layered crystal structure, is represented by general formula (1): Li1+sNixCoyMnzMwBtO2+?, and includes a lithium-metal composite oxide containing a secondary particle with a plurality of aggregated primary particles and a lithium-boron compound present on at least a part of surfaces of the primary particles. The amount of lithium hydroxide that elutes when the positive electrode active material is dispersed in water, measured by a neutralization titration method, is 0.01% by mass or more and 0.5% by mass or less with respect to the entire positive electrode active material.
    Type: Application
    Filed: August 23, 2018
    Publication date: November 12, 2020
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Hiroko Oshita, Motoaki Saruwatari, Kazuomi Ryoshi
  • 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: 20200343546
    Abstract: Provided is a positive electrode active material for non-aqueous electrolyte secondary batteries for making high capacity and high output compatible, non-aqueous electrolyte secondary batteries, to which the positive electrode active material is adopted, and a production method for a positive electrode active material in which the positive electrode active material can be easily produced even on an industrial scale. A positive electrode active material for non-aqueous electrolyte secondary batteries, comprising: primary particles of a lithium nickel composite oxide represented by at least General Formula: LizNi1-x-yCoxMyO2 (0.95?z?1.03, 0?x?0.20, 0?y?0.10, x+y?0.20, and M is at least one type of element selected from Mg, Al, Ca, Ti, V, Cr, Mn, Nb, Zr, and Mo); and secondary particles configured by aggregating the primary particles, wherein an LiAl compound is provided on surfaces of the primary particles.
    Type: Application
    Filed: July 31, 2018
    Publication date: October 29, 2020
    Inventors: Jun Yokoyama, Kazuomi Ryoshi
  • Publication number: 20200343547
    Abstract: Provided is a positive electrode active material for non-aqueous electrolyte secondary batteries for making high capacity and high output compatible, non-aqueous electrolyte secondary batteries, having the positive electrode active material adopted thereto, and a production method for a positive electrode active material in which the positive electrode active material can be easily produced in an industrial scale. A positive electrode active material for non-aqueous electrolyte secondary batteries, contains: primary particles of a lithium nickel composite oxide represented by at least General Formula: LizNi1-x-yCoxMyO2 (0.95?z?1.03, 0<x?0.20, 0<y?0.10, x+y?0.20, and M is at least one type of element selected from Mg, Al, Ca, Ti, V, Cr, Mn, Nb, Zr, and Mo); and secondary particles configured by flocculating the primary particles, wherein an LiAl compound and an LiW compound are provided on surfaces of the primary particles.
    Type: Application
    Filed: July 31, 2018
    Publication date: October 29, 2020
    Applicants: SUMITOMO METAL MINING CO., LTD., SUMITOMO METAL MINING CO., LTD.
    Inventors: Jun Yokoyama, Kazuomi Ryoshi
  • 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: 20200313180
    Abstract: The positive electrode active material is for a non-aqueous electrolyte secondary battery, suppressing deterioration of battery characteristics due to exposure to the atmosphere and having excellent battery capacity. A positive electrode active material for a non-aqueous electrolyte secondary battery includes a lithium-nickel composite oxide represented by general formula (1): LiaNi1-x-yCoxMyO2+? (in which 0.05?x?0.35, 0?y?0.10, 0.95?a?1.10, 0?a?0.2, and M represents at least one element selected from Mn, V, Mg, Mo, Nb, Ti, W, and Al) and Li3BO3. At least a part of a surface of the lithium-nickel composite oxide is coated with Li3BO3. The content of boron in the positive electrode active material is 0.001% by mass or more and 0.2% by mass or less with respect to the entire positive electrode active material.
    Type: Application
    Filed: August 23, 2018
    Publication date: October 1, 2020
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Kazuomi Ryoshi, Motoaki Saruwatari, Hiroko Oshita, Yoshihiro Otsuka
  • Patent number: 10781531
    Abstract: A method for producing a nickel-containing hydroxide is provided that includes a nucleation step of generating nuclei of nickel-containing hydroxide particles by neutralization crystallization in an aqueous solution accommodated in an agitation tank. In the nucleation step, a volume fraction of a highly supersaturated region in the aqueous solution where the molar concentration of the nickel-containing hydroxide dissolved in the aqueous solution is greater than or equal to 5.0 mol/m3 is less than 0.100% of the aqueous solution.
    Type: Grant
    Filed: June 12, 2017
    Date of Patent: September 22, 2020
    Assignee: SUMITOMO METAL MINING CO., LTD.
    Inventors: Shuhei Nakakura, Kazuhiko Tsuchioka, Koichiro Maki, Motoaki Saruwatari, Kazuomi Ryoshi, Yoshihiko Nakao, Masafumi Yoshida
  • Publication number: 20200251732
    Abstract: The positive electrode active material for a nonaqueous electrolyte secondary battery contains a lithium-nickel composite oxide represented by a general formula: LiaNi1?x?yCoxMyO2+? (where 0.01?x?0.35, 0?y?0.10, 0.95?a?1.10, and 0???0.2; and M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al) and a boron compound. At least part of the boron compound is present on the surface of the lithium-nickel composite oxide in the form of Li3BO3 and LiBO2, and a mass ratio (Li3BO3/LiBO2) between Li3BO3 and LiBO2 is at least 0.005 and up to 10. Boron is contained in an amount of at least 0.011% by mass and up to 0.6% by mass relative to the entire amount of the positive electrode active material.
    Type: Application
    Filed: May 31, 2018
    Publication date: August 6, 2020
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Kazuomi Ryoshi, Yoshihiro Otsuka, Hiroko Oshita
  • Publication number: 20200227718
    Abstract: Provided is a positive electrode active material for nonaqueous electrolyte secondary batteries that suppresses the gelling of a positive electrode mixture material paste and has high weather resistance, a production method thereof, and the like. A method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries includes cleaning a powder formed of a lithium-nickel composite oxide represented by a general formula LizNi1-x-yCoxMyO2 where 0?x?0.35; 0?y?0.10; 0.95?z?1.10; and M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al with an aqueous lithium carbonate solution and drying the cleaned powder.
    Type: Application
    Filed: August 25, 2016
    Publication date: July 16, 2020
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Hiroko Oshita, Kazuomi Ryoshi
  • Patent number: 10689262
    Abstract: A method for producing a nickel-containing hydroxide is provided that includes a particle growth step of promoting growth of nickel-containing hydroxide particles by neutralization crystallization in an aqueous solution accommodated in an agitation tank. In the particle growth step, an averaged value of the maximum accelerations of the flows of streamlines for the aqueous solution is greater than 600 m/s2.
    Type: Grant
    Filed: June 12, 2017
    Date of Patent: June 23, 2020
    Assignee: SUMITOMO METAL MINING CO., LTD.
    Inventors: Shuhei Nakakura, Kazuhiko Tsuchioka, Koichiro Maki, Motoaki Saruwatari, Kazuomi Ryoshi, Yoshihiko Nakao, Masafumi Yoshida
  • Publication number: 20200161653
    Abstract: Provided is a nickel-containing composite hydroxide that is a precursor of a positive-electrode active material with which a nonaqueous-electrolyte secondary battery having a low irreversible capacity and a high energy density can be configured. An aqueous alkaline aqueous solution and a complexing agent are added to an mixed aqueous solution including at least nickel and cobalt to regulate the pH (measured at a reference liquid temperature of 25° C.) of this mixed aqueous solution to 11.0 to 13.0, the ammonium concentration to 4 to 15 g/L, and the reaction temperature to 20° C. to 45° C. Using stirring blades having an inclination angle of 20° to 60° with respect to a horizontal plane, the mixture is stirred to conduct a crystallization reaction under such conditions that when the nickel-containing composite hydroxide to be obtained is roasted in air at 800° C. for 2 hours, the roasted composite hydroxide has a BET value of 12 to 50 m2/g.
    Type: Application
    Filed: January 22, 2020
    Publication date: May 21, 2020
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Kazuomi RYOSHI, Kensaku MORI, Katsuya KASE, Yasutaka KAMATA