Patents by Inventor Takao Kitagawa

Takao Kitagawa 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: 10892485
    Abstract: An electrode material for a lithium ion secondary battery of the present invention is an electrode material for a lithium ion secondary battery including an electrode active material and a carbonaceous film that coats a surface of the electrode active material, in which a hydroxy group and a group which is at least one selected from a carboxyl group, a nitro group, and a sulfo group have been introduced to an outermost surface of the carbonaceous film, a ratio of a total count number of the group which is at least one selected from the carboxyl group, the nitro group, and the sulfo group to a count number of the hydroxy group is 0.001 or more and 10.000 or less when a surface of the carbonaceous film is analyzed through time-of-flight secondary ion mass spectrometry to obtain the ratio, a coating ratio of the carbonaceous film is set to 40% or more and 90% or less, and the carbonaceous film has at least one through-hole per 100 square nanometers.
    Type: Grant
    Filed: September 24, 2018
    Date of Patent: January 12, 2021
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Takao Kitagawa, Tetsuya Nakabeppu
  • Patent number: 10818923
    Abstract: A cathode material for a lithium-ion secondary battery of the present invention is active material particles including central particles represented by LixAyMzPO4 and a carbonaceous film that coats surfaces of the central particles, in which a median diameter is 0.50 ?m or more and 0.80 ?m or less, and a chromaticity b* in an L*a*b* color space is 1.9 or more and 2.3 or less.
    Type: Grant
    Filed: February 15, 2017
    Date of Patent: October 27, 2020
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Masataka Oyama, Takao Kitagawa
  • Patent number: 10693138
    Abstract: A cathode material is provided which comprises secondary particles of cathode active material particles including central particles of LixFeyMzPO4 and a carbonaceous film which coats the central particles, wherein a particle size distribution thereof has maximum values of a relative particle amount on both fine and coarse particle sides. A particle diameter with the maximum relative particle amount on the fine particle side is in a range A of 0.70 ?m to 2.00 ?m, and a particle diameter with the maximum relative particle amount on the coarse particle side is in a range B of 7.00 ?m to 15.00 ?m. A difference between maximum values of a relative particle amount is 2.00% to 6.00%.
    Type: Grant
    Filed: March 26, 2018
    Date of Patent: June 23, 2020
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Masataka Oyama, Koji Oono, Takao Kitagawa
  • Publication number: 20200161657
    Abstract: A lithium-ion secondary battery including a cathode, an anode, and an electrolyte, in which the lithium-ion secondary battery includes inorganic phosphate particles, and the cathode includes cathode active material particles which include central particles made of LixAyMzPO4 (0?x?1.1, 0.8?y?1.1, and 0?z?0.2; here, A represents at least one element selected from the group consisting of Fe, Mn, Co, and Ni, and M represents at least one element selected from the group consisting of Mg, Ca, Co, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, and rare earth elements) and a carbonaceous film that coats surfaces of the central particles.
    Type: Application
    Filed: January 8, 2020
    Publication date: May 21, 2020
    Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Masataka OYAMA, Takao KITAGAWA
  • Patent number: 10629908
    Abstract: A cathode material for a lithium-ion secondary battery which includes granulated bodies in which primary particles are aggregated, wherein an average particle diameter of the granulated bodies is 4.50 ?m or more and 6.20 ?m or less, and particle diameters of 90% or more of the granulated bodies are 1.00 ?m or more and 11.00 ?m or less, wherein particle diameters of the granulated bodies are evaluated such that 300 granulated bodies are randomly selected from a view of the granulated bodies using a scanning electron microscope, a plurality of diameters of each of the 300 granulated bodies that pass through a central point thereof are evaluated, and a maximum diameter selected from the plurality of diameters is considered as a particle diameter of each of granulated bodies.
    Type: Grant
    Filed: March 26, 2018
    Date of Patent: April 21, 2020
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Masataka Oyama, Takao Kitagawa
  • Patent number: 10573890
    Abstract: A cathode material for a lithium-ion secondary battery including: granulated bodies in which primary particles are aggregated, wherein an average particle diameter of the granulated bodies is 0.90 ?m or more and 2.00 ?m or less, particle diameters of 90% or more of the granulated bodies are 0.25 ?m or more and 3.50 ?m or less, wherein particle diameters of the granulated bodies are evaluated such that 300 granulated bodies are randomly selected from a view of the granulated bodies using a scanning electron microscope, a plurality of diameters of each of the 300 granulated bodies that pass through a central point thereof are evaluated, and a maximum diameter selected from said plurality of diameters is considered as a particle diameter of each of the granulated bodies.
    Type: Grant
    Filed: March 26, 2018
    Date of Patent: February 25, 2020
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Masataka Oyama, Ryuuta Yamaya, Takao Kitagawa
  • Patent number: 10566621
    Abstract: A lithium-ion secondary battery including a cathode, an anode, and an electrolyte, in which the lithium-ion secondary battery includes inorganic phosphate particles, and the cathode includes cathode active material particles which include central particles made of LixAyMzPO4 (0?x?1.1, 0.8?y?1.1, and 0?z?0.2; here, A represents at least one element selected from the group consisting of Fe, Mn, Co, and Ni, and M represents at least one element selected from the group consisting of Mg, Ca, Co, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, and rare earth elements) and a carbonaceous film that coats surfaces of the central particles.
    Type: Grant
    Filed: March 20, 2017
    Date of Patent: February 18, 2020
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD
    Inventors: Masataka Oyama, Takao Kitagawa
  • Patent number: 10566622
    Abstract: A cathode material for a lithium-ion secondary battery, the cathode material including: secondary particles which are granulated active material particles including central particles and a carbonaceous film that coats surfaces of the central particles, wherein a granulated body breakage degree ((a?b)/a) of the secondary particles is 0.03 or more and 0.30 or less, and the granulated body breakage degree is calculated based on a relative particle amount a, at which a maximum peak is shown in a particle size distribution of the secondary particles, and a relative particle amount b, at which a maximum peak in a particle size distribution of the secondary particles is shown after a dispersion treatment of the secondary particles is performed using a homogenizer.
    Type: Grant
    Filed: March 26, 2018
    Date of Patent: February 18, 2020
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Masataka Oyama, Takao Kitagawa
  • Publication number: 20190386290
    Abstract: An electrode material having an electrode active material and a pyrolytic carbonaceous electron-conducting film that coats a surface of the electrode active material, in which an amount of a surface acid of the electrode material, which is determined by a back-titration method using tetrabutylammonium hydroxide, is 1 ?mol/m2 or more and 5 ?mol/m2 or less per surface area of the electrode material.
    Type: Application
    Filed: February 22, 2019
    Publication date: December 19, 2019
    Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Kouji OONO, Takao KITAGAWA, Tetsuya NAKABEPPU
  • Patent number: 10483589
    Abstract: A lithium-ion secondary battery of the present invention includes a cathode including an electrode material having electrode active material particles and an oxide coat and a carbonaceous film which coat surfaces of the electrode active material particles, an anode including a carbon-based active material, and an electrolytic solution, and the electrolytic solution does not substantially include additives for stabilizing a coat formed on a surface of the anode.
    Type: Grant
    Filed: September 29, 2016
    Date of Patent: November 19, 2019
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Kouji Oono, Takao Kitagawa
  • Publication number: 20190305307
    Abstract: An electrode material for a lithium ion secondary battery of the present invention is an electrode material for a lithium ion secondary battery including an electrode active material and a carbonaceous film that coats a surface of the electrode active material, in which a hydroxy group and a group which is at least one selected from a carboxyl group, a nitro group, and a sulfo group have been introduced to an outermost surface of the carbonaceous film, a ratio of a total count number of the group which is at least one selected from the carboxyl group, the nitro group, and the sulfo group to a count number of the hydroxy group is 0.001 or more and 10.000 or less when a surface of the carbonaceous film is analyzed through time-of-flight secondary ion mass spectrometry to obtain the ratio, a coating ratio of the carbonaceous film is set to 40% or more and 90% or less, and the carbonaceous film has at least one through-hole per 100 square nanometers.
    Type: Application
    Filed: September 24, 2018
    Publication date: October 3, 2019
    Inventors: Takao KITAGAWA, Tetsuya NAKABEPPU
  • Publication number: 20190305364
    Abstract: A cathode material for a lithium ion secondary battery enabling diffusion of lithium ions in a two-dimensional direction or a three-dimensional direction in crystals is provided. The cathode material is formed by coating a surface of a central particle represented by-the Formula LixFe1?y?zAyMzPO4 with a carbonaceous film, in which a content of a carbon atom is 0.3% by mass or more and 3.4% by mass or less, and, in a Moessbauer spectrum obtained by Moessbauer spectroscopy, when an area intensity of a spectrum having an isomer shift value in a range of 1.0 mm/sec or more and 1.4 mm/sec or less is represented by ?, and an area intensity of a spectrum having an isomer shift value in a range of 0.3 mm/sec or more and 0.7 mm/sec or less is represented by ?, {?/((?+?)×(1?y?z)} is 0.01 or more and 0.1 or less.
    Type: Application
    Filed: September 27, 2018
    Publication date: October 3, 2019
    Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Masataka OYAMA, Satoru OSHITARI, Ryuuta YAMAYA, Takao KITAGAWA
  • Publication number: 20190103611
    Abstract: A cathode material for a lithium-ion secondary battery including: granulated bodies in which primary particles are aggregated, wherein an average particle diameter of the granulated bodies is 0.90 ?m or more and 2.00 ?m or less, particle diameters of 90% or more of the granulated bodies are 0.25 ?m or more and 3.50 ?m or less, wherein particle diameters of the granulated bodies are evaluated such that 300 granulated bodies are randomly selected from a view of the granulated bodies using a scanning electron microscope, a plurality of diameters of each of the 300 granulated bodies that pass through a central point thereof are evaluated, and a maximum diameter selected from said plurality of diameters is considered as a particle diameter of each of the granulated bodies.
    Type: Application
    Filed: March 26, 2018
    Publication date: April 4, 2019
    Inventors: Masataka OYAMA, Ryuuta YAMAYA, Takao KITAGAWA
  • Publication number: 20190103610
    Abstract: A cathode material fora lithium-ion secondary battery which includes granulated bodies in which primary particles are aggregated, wherein an average particle diameter of the granulated bodies is 4.50 ?m or more and 6.20 ?m or less, and particle diameters of 90% or more of the granulated bodies are 1.00 ?m or more and 11.00 ?m or less, wherein particle diameters of the granulated bodies are evaluated such that 300 granulated bodies are randomly selected from a view of the granulated bodies using a scanning electron microscope, a plurality of diameters of each of the 300 granulated bodies that pass through a central point thereof are evaluated, and a maximum diameter selected from the plurality of diameters is considered as a particle diameter of each of granulated bodies.
    Type: Application
    Filed: March 26, 2018
    Publication date: April 4, 2019
    Inventors: Masataka OYAMA, Takao KITAGAWA
  • Publication number: 20190097230
    Abstract: A cathode material for a lithium-ion secondary battery, the cathode material including: secondary particles which are granulated active material particles including central particles and a carbonaceous film that coats surfaces of the central particles, wherein a granulated body breakage degree ((a?b)/a) of the secondary particles is 0.03 or more and 0.30 or less, and the granulated body breakage degree is calculated based on a relative particle amount a, at which a maximum peak is shown in a particle size distribution of the secondary particles, and a relative particle amount b, at which a maximum peak in a particle size distribution of the secondary particles is shown after a dispersion treatment of the secondary particles is performed using a homogenizer.
    Type: Application
    Filed: March 26, 2018
    Publication date: March 28, 2019
    Inventors: Masataka OYAMA, Takao KITAGAWA
  • Publication number: 20180309128
    Abstract: A cathode material is provided which comprises secondary particles of cathode active material particles including central particles of LixFeyMzPO4 and a carbonaceous film which coats the central particles, wherein a particle size distribution thereof has maximum values of a relative particle amount on both fine and coarse particle sides. A particle diameter with the maximum relative particle amount on the fine particle side is in a range A of 0.70 ?m to 2.00 ?m, and a particle diameter with the maximum relative particle amount on the coarse particle side is in a range B of 7.00 ?m to 15.00 ?m. A difference between maximum values of a relative particle amount is 2.00% to 6.00%.
    Type: Application
    Filed: March 26, 2018
    Publication date: October 25, 2018
    Inventors: Masataka OYAMA, Koji OONO, Takao KITAGAWA
  • Patent number: 10109861
    Abstract: A cathode material for a lithium-ion secondary battery of the present invention includes central particles represented by LixAyMzPO4 and a carbonaceous film that coats surfaces of the central particles, an average value of R values (I1580/I1360), which are ratios of a peak intensity (I1580) of a spectrum at a frequency band of 1,580±50 cm?1 to a peak intensity (I1360) of the spectrum at a frequency band of 1,360±50 cm?1 in a Raman spectrum analysis, measured at five points is 0.80 or more and 1.10 or less, and a standard deviation of the R values measured at five points is 0.010 or less.
    Type: Grant
    Filed: February 15, 2017
    Date of Patent: October 23, 2018
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Masataka Oyama, Takao Kitagawa
  • Patent number: 10090517
    Abstract: A cathode material for a lithium-ion secondary battery includes a cathode material A which includes central particles of a cathode active material represented by LixAyMzPO4 and a carbonaceous film with which surfaces of the central particles are coated and a cathode material B which is represented by LixAyMzPO4 and is made of primary particles of a cathode active material having an olivine structure.
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: October 2, 2018
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Masataka Oyama, Takao Kitagawa
  • Publication number: 20180277846
    Abstract: A cathode material for a lithium-ion secondary battery of the present invention includes active material secondary particles formed by aggregating central particles including primary particles of a cathode active material represented by General Formula LiaAxBO4 (here, A represents at least one element selected from the group consisting of Mn, Fe, Co, and Ni, B represents at least one element selected from the group consisting of P, Si, and S, 0?a<4, and 0<x<1.5) and a carbonaceous film, wherein at least a portion of surfaces of the primary particles are coated with the carbonaceous film, and the carbonaceous film is obtained by thermal decomposition of an organic compound, in which, in a charge and discharge cycle test at 60° C.
    Type: Application
    Filed: September 20, 2017
    Publication date: September 27, 2018
    Inventors: Kouji OONO, Hirofumi Yasumiishi, Masataka OYAMA, Takao KITAGAWA
  • Publication number: 20180248188
    Abstract: An electrode for a lithium-ion secondary battery including an electrode mixture layer made of a mixture including a first electrode active material including a compound represented by General Formula LiaAbPO4, a second electrode active material including at least one compound selected from the group consisting of compounds represented by LicBdO2, a lithium cobaltate-based compound, a lithium manganate-based compound, and a lithium nickelate-based compound, a conductive auxiliary agent, and a binder, in which a thermal conductivity of the electrode for the lithium-ion secondary battery, which is derived from Expression (1) using a thermal diffusivity, a constant pressure specific heat, and an electrode density of the electrode for a lithium-ion secondary battery, is 0.9 W/(m·K) or more.
    Type: Application
    Filed: September 20, 2017
    Publication date: August 30, 2018
    Inventors: Takao KITAGAWA, Hirofumi YASUMIISHI