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: 9698425
    Abstract: The present invention provides an electrode material in which unevenness in a supporting amount of a carbonaceous film is less when using an electrode-active material having a carbonaceous film on a surface thereof as the electrode material, and which is capable of improving conductivity, and a method for producing the electrode material. The electrode material includes an aggregate formed by aggregating an electrode-active material in which a carbonaceous film is formed on a surface. In the electrode material, an average particle size of the aggregate is 0.5 to 100 ?m, a volume density of the aggregate is 50 to 80 vol % of a volume density in a case in which the aggregate is a solid, and 80% or more of the surface of the electrode-active material is covered with the carbonaceous film. Alternatively, the electrode material includes an aggregate formed by aggregating electrode-active material particles in which a carbonaceous film is formed on a surface.
    Type: Grant
    Filed: December 11, 2014
    Date of Patent: July 4, 2017
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Takao Kitagawa, Hirofumi Yasumiishi, Masaru Uehara
  • Patent number: 9680149
    Abstract: An electrode material includes an electrode active material having a carbonaceous film formed on a surface is used and which is capable of suppressing voltage drop when high-speed charge and discharge is carried out in a low-temperature environment. The electrode material has a particulate shape and is formed a carbonaceous film on surfaces of electrode active material particles. An average of discharge capacity ratios between a 35C discharge capacity at ?10° C. of a single particle of the electrode material and a 1C discharge capacity at ?10° C. of a single particle of the electrode material is 0.50 or more.
    Type: Grant
    Filed: May 21, 2015
    Date of Patent: June 13, 2017
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Takao Kitagawa, Hiroyuki Mine, Hirofumi Yasumiishi
  • Publication number: 20170092938
    Abstract: An electrode material tor a lithium-ion rechargeable battery of the present invention includes inorganic particles represented by General Formula LiFexMn1-x-yMyPO4 (0.05?x?1.0, 0?y?0.14; here, M represents at least one element selected from Mg, Ca, Co, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, and rare earth elements) and a carbonaceous film coating surfaces of the inorganic particles, and at least one peak of a micropore diameter distribution is present in a range of 0.4 nm to 5.0 nm. An electrode for a lithium-ion rechargeable battery of the present invention includes the electrode material for a lithium-ion rechargeable battery of the present invention. A lithium-ion rechargeable battery of the present invention includes a cathode, an anode, and a non-aqueous electrolyte, in which the electrode for a lithium-ion rechargeable battery of the present invention is used as the cathode.
    Type: Application
    Filed: January 28, 2016
    Publication date: March 30, 2017
    Inventors: Kouji OONO, Hirofumi YASUMIISHI, Takao KITAGAWA
  • Publication number: 20170092937
    Abstract: Provided are an electrode material for a lithium-ion rechargeable battery including core particles of an active material and a carbonaceous film, in which a powder resistance is 150 ?·cm or less, and a lithium-ion rechargeable battery produced using the electrode material and a lithium metal exhibits a difference between a sum of a charge capacity with an upper limit voltage of 4.2 V and the lithium-ion rechargeable battery charged at a constant current and a charge capacity with the lithium-ion rechargeable battery charged at a constant voltage for seven days at 4.2 V after the constant current charging and a discharge capacity with the lithium-ion rechargeable battery discharged at a constant current to 2 V after the constant voltage charging reaches 25 mAh/g or less, a method for manufacturing the electrode material, an electrode including the electrode material, and a lithium-ion rechargeable battery including the electrode as a cathode.
    Type: Application
    Filed: January 14, 2016
    Publication date: March 30, 2017
    Inventors: Masataka OYAMA, Kouji OONO, Takao KITAGAWA
  • Publication number: 20160322630
    Abstract: A positive electrode material for lithium ion secondary batteries includes central particles composed of LiFexMn1-x-yMyPO4 (0.05?x?1.0, 0?y?0.14, wherein M represents at least one element selected from Mg, Ca, Co, Sr, Ba, Ti, Zn, B, Al, Ga, In, Si, Ge, and rare earth elements), and a carbonaceous film that covers surfaces of the central particles, in which a specific magnetization is 0.70 emu/g or less, and an amount of water detected by a Karl Fischer titration method (coulometric titration method) in a temperature range of 100° C. or higher and 250° C. or lower is 8,000 ppm or less.
    Type: Application
    Filed: November 19, 2015
    Publication date: November 3, 2016
    Inventors: Masataka OYAMA, Akinori YAMAZAKI, Satoru OSHITARI, Ryuuta YAMAYA, Takao KITAGAWA
  • Patent number: 9455442
    Abstract: A carbon-coated active material composite, an electrode and a lithium ion battery capable of improving electron conductivity and lithium ion conductivity when an electrode active material having a carbonaceous film formed on the surface is used as an electrode material are provided. In the carbon-coated active material composite, charge migration of lithium ions occurs at an interface between a carbonaceous film and an electrode active material, an activation energy of an insertion and removal reaction of lithium ions at an interface between the carbon-coated active material composite and an electrolytic solution is 45 kJ/mol to 85 kJ/mol, a value of a carbon supported amount to a specific surface area of particles of an electrode active material is 0.01 to 0.5, and the activation energy is measured using an electrolyte solution obtained by mixing ethylene carbonate and diethyl carbonate at a 1:1 ratio.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: September 27, 2016
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Hiroyuki Mine, Takao Kitagawa
  • Patent number: 9391330
    Abstract: An electrode material containing an electrode active material, and a carbonaceous coating film which covers the electrode active material and contains sulfur; and an electrode material including a secondary particle including a plurality of primary particles as the electrode active material, wherein the primary particles are covered with a carbonaceous coating film so that the carbonaceous coating film is interposed between the primary particles and the carbonaceous coating film contains sulfur.
    Type: Grant
    Filed: December 19, 2013
    Date of Patent: July 12, 2016
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Takao Kitagawa, Mitsumasa Saito
  • Publication number: 20160190589
    Abstract: An electrode material including electrode active material particles and a carbonaceous film layer coating surfaces of the electrode active material particles and including a metal oxide, a content ratio of the metal oxide in the carbonaceous film layer being 5% by mass to 70% by mass. A method for manufacturing an electrode material, in which electrode active material particles, a metal salt or metal alkoxide containing any one or more metal atoms selected from a group consisting of Al, Zr, Si, and Ti, and an organic compound which is a precursor of carbon are mixed so that a total blending amount of the metal salt or metal alkoxide satisfies that an amount of a metal oxide in the carbonaceous film layer when the metal salt or metal alkoxide is all changed to the metal oxide is 5% by mass to 70% by mass, and are heated in a non-oxidative atmosphere.
    Type: Application
    Filed: April 27, 2015
    Publication date: June 30, 2016
    Inventors: Kouji OONO, Kenta OOISHI, Takao KITAGAWA, Masataka OYAMA, Satoru OSHITARI, Ryuuta YAMAYA
  • Publication number: 20160172664
    Abstract: An electrode material is provided in which a coating of a carbonaceous material is formed efficiently, uniformly and strongly on the surfaces of electrode active material particles, and therefore electron conductivity and the charge and discharge capacity of batteries are improved. The electrode material includes composite particles, which includes a carbonaceous substance and an electrode active material, wherein a carbonaceous material is provided on surfaces of electrode active material particles, and a standard rate constant of a redox reaction of ferrocene occurring on the surfaces of the composite particles is 1×10?5 cm/s or more.
    Type: Application
    Filed: August 7, 2014
    Publication date: June 16, 2016
    Inventors: Hiroyuki MINE, Takao KITAGAWA
  • Publication number: 20160156026
    Abstract: An electrode material in which an electrode active material having a carbonaceous film formed on the surface is used, a migration path through which lithium ions diffuse is maintained in the carbonaceous film, and the lithium ion conductivity is also improved while the electron conductivity is supported by the carbonaceous film is provided. A electrode material, wherein the electrode material have a particulate shape, the electrode material is formed a carbonaceous film on surfaces of electrode active material particles, a coating proportion of the surfaces of the electrode active material particles by the carbonaceous film is 80% or more, and an apparent density (?V) of the carbonaceous film calculated from an amount of carbon in the electrode material, a specific surface area of the electrode material, and an average film thickness of the carbonaceous film is in a range of 0.10 g/cm3 to 1.08 g/cm3.
    Type: Application
    Filed: April 27, 2015
    Publication date: June 2, 2016
    Inventors: Takao KITAGAWA, Kenta Ooishi
  • Patent number: 9356286
    Abstract: An electrode material in which an electrode active material having a carbonaceous film formed on the surface is used, a migration path through which lithium ions diffuse is maintained in the carbonaceous film, and the lithium ion conductivity is also improved while the electron conductivity is supported by the carbonaceous film is provided. A electrode material, wherein the electrode material have a particulate shape, the electrode material is formed a carbonaceous film on surfaces of electrode active material particles, a coating proportion of the surfaces of the electrode active material particles by the carbonaceous film is 80% or more, and an apparent density (?V) of the carbonaceous film calculated from an amount of carbon in the electrode material, a specific surface area of the electrode material, and an average film thickness of the carbonaceous film is in a range of 0.10 g/cm3 to 1.08 g/cm3.
    Type: Grant
    Filed: April 27, 2015
    Date of Patent: May 31, 2016
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Takao Kitagawa, Kenta Ooishi
  • Patent number: 9343741
    Abstract: An electrode material of the invention includes an agglomerate formed by agglomerating carbonaceous coated electrode active material particles obtained by forming a carbonaceous coat on surfaces of electrode active material particles at a coating rate of 80% or more, and the carbonaceous coated electrode active material particles include first carbonaceous coated electrode active material particles on which a carbonaceous coat having a film thickness in a range of 0.1 nm to 3.0 nm and an average film thickness in a range of 1.0 nm to 2.0 nm is formed and second carbonaceous coated electrode active material particles on which a carbonaceous coat having a film thickness in a range of 1.0 nm to 10.0 nm and an average film thickness in a range of more than 2.0 nm to 7.0 nm is formed.
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: May 17, 2016
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Takao Kitagawa, Tetsuya Nakabeppu
  • Publication number: 20160093878
    Abstract: An electrode material including electrode active material particles having a carbonaceous film formed on the surfaces thereof in which the coatability of the carbonaceous film can be guaranteed even when a crushing process is carried out, and the rate characteristics and the like are not degraded during charge and discharge, an electrode and a lithium ion battery having excellent charge and discharge characteristics for which the electrode material is used are provided. The electrode material includes electrode active material particles having a carbonaceous film formed on surfaces thereof, and an affinity value to N-methyl-2-pyrrolidone measured through pulse NMR is in a range of 5000 to 20000.
    Type: Application
    Filed: April 28, 2015
    Publication date: March 31, 2016
    Inventors: Kenta OOISHI, Takao Kitagawa
  • Publication number: 20150380734
    Abstract: An electrode material for which an electrode active material having a carbonaceous film formed on a surface is used and which is capable of suppressing voltage drop when high-speed charge and discharge is carried out in a low-temperature environment is provided. A electrode material, wherein the electrode material have a particulate shape, the electrode material is formed a carbonaceous film on surfaces of electrode active material particles, and an average of discharge capacity ratios between a 35 C discharge capacity at ?10° C. of a single particle of the electrode material and a 1 C discharge capacity at ?10° C. of a single particle of the electrode material is 0.50 or more.
    Type: Application
    Filed: May 21, 2015
    Publication date: December 31, 2015
    Inventors: Takao KITAGAWA, Hiroyuki Mine, Hirofumi Yasumiishi
  • Publication number: 20150380725
    Abstract: An electrode material in which an electrode active material having a carbonaceous film formed on the surface is used and which is capable of suppressing a voltage drop when high-speed charge and discharge is carried out in a low-temperature environment is provided. A electrode material, wherein the electrode material have a particulate shape, the electrode material is formed a carbonaceous film on surfaces of electrode active material particles, and the carbonaceous film is constituted randomly stacking graphene layers. Preferably, an inflection ratio of a lithium ion migration path in the carbonaceous film in the electrode material is in a range of 1.1 to 100.
    Type: Application
    Filed: February 27, 2015
    Publication date: December 31, 2015
    Inventors: Hiroyuki MINE, Hirofumi YASUMIISHI, Kouji OONO, Takao KITAGAWA
  • Patent number: 9193833
    Abstract: A phosphor-containing cured silicone that is a cured silicone which has a structure represented by general formulae (1) and/or (2) and also has units selected from general formulae (3) and/or (4), the phosphor-containing cured silicone includes a phosphor and particles having units selected from general formulae (3) and/or (4): wherein R1 to R3 are each a hydrogen atom, a methyl group, an ethyl group or a propyl group; X represents a methylene group, a dimethylene group or a trimethylene group, and may be the same or different; and R4 to R6 are each a substituted or unsubstituted monovalent hydrocarbon group, and may be the same or different. An object of the present invention is to provide a cured silicone in which a phosphor is uniformly dispersed, the cured silicone is characterized in that a silicone material has good thermal resistance and lightfastness.
    Type: Grant
    Filed: February 9, 2011
    Date of Patent: November 24, 2015
    Assignee: Toray Industries, Inc.
    Inventors: Kazuki Goto, Tetsuya Goto, Masuichi Eguchi, Takao Kitagawa, Kazunari Kawamoto, Yutaka Ishida, Hirofumi Tsuchiya, Takayoshi Akamatsu
  • Publication number: 20150325846
    Abstract: An electrode material includes an aggregate which is formed by aggregating electrode active material particles having a carbonaceous film forced on the surface thereof, in which a volume density of the aggregate is 50% by volume or more and 80% by volume or less of the volume density of a solid body which has the same external appearance as the aggregate, a coverage ratio of the carbonaceous film with respect to the surface of the electrode active material particles is 80% or more, and an average thickness of the carbonaceous film is 1.0 nm or more and 7.0 nm or less.
    Type: Application
    Filed: March 7, 2013
    Publication date: November 12, 2015
    Inventors: Takao KITAGAWA, Yoshitaka YAMAMOTO
  • Patent number: 9172087
    Abstract: An electrode material contains an agglomerate formed by agglomerating a plurality of agglomerated particles formed by agglomerating a plurality of particles of a carbonaceous coated electrode active material having a carbonaceous coat formed on a surface, the agglomerate is made up of hollow-structured particles and solid-structured particles, the average particle diameter of the agglomerate is in a range of 0.5 ?m to 100 ?m, the volume density of the agglomerate is in a range of 50% by volume to 80% by volume, the micropore distribution of micropores present in the agglomerate is monomodal, the average micropore diameter in the micropore distribution is 0.3 ?m or less, and the NMP oil absorption amount of the agglomerate is in a range of 40 g/100 g to 100 g/100 g.
    Type: Grant
    Filed: March 10, 2014
    Date of Patent: October 27, 2015
    Assignee: SUMITOMO OSAKA CEMENT CO., LTD.
    Inventors: Kenta Ooishi, Koji Oono, Takao Kitagawa, Tetsuya Nakabeppu
  • Publication number: 20150255787
    Abstract: A carbon-coated active material composite, an electrode and a lithium ion battery capable of improving electron conductivity and lithium ion conductivity when an electrode active material having a carbonaceous film formed on the surface is used as an electrode material are provided. In the carbon-coated active material composite, charge migration of lithium ions occurs at an interface between a carbonaceous film and an electrode active material, an activation energy of an insertion and removal reaction of lithium ions at an interface between the carbon-coated active material composite and an electrolytic solution is 45 kJ/mol to 85 kJ/mol, a value of a carbon supported amount to a specific surface area of particles of an electrode active material is 0.01 to 0.5, and the activation energy is measured using an electrolyte solution obtained by mixing ethylene carbonate and diethyl carbonate at a 1:1 ratio.
    Type: Application
    Filed: May 15, 2014
    Publication date: September 10, 2015
    Inventors: Hiroyuki Mine, Takao Kitagawa
  • Patent number: 9117979
    Abstract: The present invention provides a phosphor sheet in which the optical properties thereof are not impaired and which exhibits excellent film thickness uniformity even when comprising large-sized phosphor particles in high concentration. In one embodiment, the invention provides a phosphor sheet in which the content of phosphor is 53 weight % or more of the total sheet, and in another embodiment, a phosphor sheet includes at least a silicone resin, a phosphor and silicone fine particles.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: August 25, 2015
    Assignee: Toray Industries, Inc.
    Inventors: Nobuo Matsumura, Yutaka Ishida, Kazunari Kawamoto, Kazuki Goto, Takao Kitagawa, Takejiro Inoue, Hironobu Sadakuni, Hiroki Sekiguchi, Masahiro Yoshioka