Patents by Inventor Takao Kokubu

Takao Kokubu 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: 11742480
    Abstract: This positive electrode active material for nonaqueous electrolyte secondary batteries comprises composite oxide particles which contain Ni, Co and Li, while containing at least one of Mn and Al, and wherein the ratio of Ni to the total number of moles of the metal elements other than Li is 80% by mole or more. The composite oxide particles are composed of particles in an aggregated state and particles in a non-aggregated state; and the content ratio of the particles in an aggregated state to the particles in a non-aggregated state is from 5:95 to 50:50 in terms of the mass ratio.
    Type: Grant
    Filed: October 19, 2018
    Date of Patent: August 29, 2023
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Takao Kokubu, Tomoki Tsuji
  • Publication number: 20200373574
    Abstract: This positive electrode active material for nonaqueous electrolyte secondary batteries comprises composite oxide particles which contain Ni, Co and Li, while containing at least one of Mn and Al, and wherein the ratio of Ni to the total number of moles of the metal elements other than Li is 80% by mole or more. The composite oxide particles are composed of particles in an aggregated state and particles in a non-aggregated state; and the content ratio of the particles in an aggregated state to the particles in a non-aggregated state is from 5:95 to 50:50 in terms of the mass ratio.
    Type: Application
    Filed: October 19, 2018
    Publication date: November 26, 2020
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Takao Kokubu, Tomoki Tsuji
  • Patent number: 10553878
    Abstract: The present disclosure is directed to a positive electrode active material for non-aqueous electrolyte secondary batteries that is capable of suppressing an increase in battery direct current resistance due to high-temperature storage (e.g., storage at 60° C. or higher). Positive electrode active material particles in one aspect of the present disclosure include secondary particles formed by aggregation of primary particles of a lithium transition metal oxide containing Ni and Mn and include a boron compound present in the inner part and surface of the secondary particles. The difference in composition ratio between Ni and Mn in the lithium transition metal oxide is more than 0.2. The proportion of the boron element content in the inner part of the secondary particles to the total boron element content in the inner part and surface of the secondary particles is in the range from 5% by mass to 60% by mass.
    Type: Grant
    Filed: January 4, 2018
    Date of Patent: February 4, 2020
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Takao Kokubu, Atsushi Ogata
  • Patent number: 10553862
    Abstract: A positive electrode active material for a secondary battery contains second particles which are produced by aggregation of primary particles of a lithium transition metal oxide containing Ni and W, and a boron compound present inside and on the surfaces of the secondary particles.
    Type: Grant
    Filed: May 15, 2018
    Date of Patent: February 4, 2020
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Atsushi Ogata, Takao Kokubu
  • Patent number: 10454107
    Abstract: A positive electrode for nonaqueous electrolyte secondary batteries and a nonaqueous electrolyte secondary battery are provided with which loss of initial efficiency can be limited even if a positive electrode exposed to air is used. An aspect of a positive electrode according to the present invention for nonaqueous electrolyte secondary batteries is a positive electrode for nonaqueous electrolyte secondary batteries incorporating a lithium transition metal oxide, wherein the positive electrode for nonaqueous electrolyte secondary batteries contains a tungsten compound and a boron compound. It is particularly preferred that the tungsten compound be a tungsten-containing oxide.
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: October 22, 2019
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Fumiharu Niina, Takao Kokubu, Takeshi Ogasawara
  • Patent number: 10283768
    Abstract: There is provided a positive electrode for nonaqueous electrolyte secondary batteries in which a decrease in the initial discharge voltage can be suppressed even when a positive electrode exposed to the air is used. The positive electrode for a nonaqueous electrolyte secondary battery according to an aspect of the present invention contains a lithium transition metal oxide constituted by a secondary particle formed by aggregation of primary particles. A rare-earth compound adheres to at least part of a surface of the secondary particle, and a compound containing lithium and boron adheres to at least part of the surface of the secondary particle and at least part of an interface between primary particles aggregated at the surface of the secondary particle.
    Type: Grant
    Filed: July 7, 2015
    Date of Patent: May 7, 2019
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Takao Kokubu, Takeshi Ogasawara
  • Patent number: 10128495
    Abstract: A positive electrode for a nonaqueous electrolyte secondary battery that does not undergo a decrease in discharge capacity in low-temperature discharge during charge and discharge after the battery is left standing at high temperature in a charged state, for example. The positive electrode for a nonaqueous electrolyte secondary battery includes a positive electrode active material. The positive electrode active material includes a mixture of lithium nickel cobalt manganate and lithium cobaltate having a compound adhered to part of a surface thereof, the compound containing fluorine and at least one selected from zirconium, magnesium, titanium, aluminum, and a rare earth element; and a ratio of the lithium nickel cobalt manganate relative to a total amount of the positive electrode active material is 1% by mass or more and less than 70% by mass.
    Type: Grant
    Filed: January 23, 2014
    Date of Patent: November 13, 2018
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Taiki Satow, Takao Kokubu, Taizou Sunano, Takeshi Ogasawara
  • Publication number: 20180261835
    Abstract: A positive electrode active material for a secondary battery contains second particles which are produced by aggregation of primary particles of a lithium transition metal oxide containing Ni and W, and a boron compound present inside and on the surfaces of the secondary particles.
    Type: Application
    Filed: May 15, 2018
    Publication date: September 13, 2018
    Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Atsushi Ogata, Takao Kokubu
  • Publication number: 20180131006
    Abstract: The present disclosure is directed to a positive electrode active material for non-aqueous electrolyte secondary batteries that is capable of suppressing an increase in battery direct current resistance due to high-temperature storage (e.g., storage at 60° C. or higher). Positive electrode active material particles in one aspect of the present disclosure include secondary particles formed by aggregation of primary particles of a lithium transition metal oxide containing Ni and Mn and include a boron compound present in the inner part and surface of the secondary particles. The difference in composition ratio between Ni and Mn in the lithium transition metal oxide is more than 0.2. The proportion of the boron element content in the inner part of the secondary particles to the total boron element content in the inner part and surface of the secondary particles is in the range from 5% by mass to 60% by mass.
    Type: Application
    Filed: January 4, 2018
    Publication date: May 10, 2018
    Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Takao Kokubu, Atsushi Ogata
  • Publication number: 20170155141
    Abstract: There is provided a positive electrode for nonaqueous electrolyte secondary batteries in which a decrease in the initial discharge voltage can be suppressed even when a positive electrode exposed to the air is used. The positive electrode for a nonaqueous electrolyte secondary battery according to an aspect of the present invention contains a lithium transition metal oxide constituted by a secondary particle formed by aggregation of primary particles. A rare-earth compound adheres to at least part of a surface of the secondary particle, and a compound containing lithium and boron adheres to at least part of the surface of the secondary particle and at least part of an interface between primary particles aggregated at the surface of the secondary particle.
    Type: Application
    Filed: July 7, 2015
    Publication date: June 1, 2017
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Takao Kokubu, Takeshi Ogasawara
  • Publication number: 20170005333
    Abstract: A positive electrode for nonaqueous electrolyte secondary batteries and a nonaqueous electrolyte secondary battery are provided with which loss of initial efficiency can be limited even if a positive electrode exposed to air is used. An aspect of a positive electrode according to the present invention for nonaqueous electrolyte secondary batteries is a positive electrode for nonaqueous electrolyte secondary batteries incorporating a lithium transition metal oxide, wherein the positive electrode for nonaqueous electrolyte secondary batteries contains a tungsten compound and a boron compound. It is particularly preferred that the tungsten compound be a tungsten-containing oxide.
    Type: Application
    Filed: March 12, 2015
    Publication date: January 5, 2017
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Fumiharu Niina, Takao Kokubu, Takeshi Ogasawara
  • Publication number: 20160301079
    Abstract: Provided is a positive electrode for nonaqueous electrolyte secondary batteries. The positive electrode allows the batteries to operate with a limited loss of initial efficiency even if the positive electrode has been exposed to air. In an aspect of a positive electrode for nonaqueous electrolyte secondary batteries according to the present invention, the positive electrode for nonaqueous electrolyte secondary batteries contains positive electrode active material particles and a boron compound. The positive electrode active material particles are composed of a lithium transition metal oxide and a rare earth compound adhering to the surface thereof.
    Type: Application
    Filed: November 20, 2014
    Publication date: October 13, 2016
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Takao Kokubu, Takeshi Ogasawara, Fumiharu Niina
  • Publication number: 20160013478
    Abstract: A positive electrode for a nonaqueous electrolyte secondary battery that does not undergo a decrease in discharge capacity in low-temperature discharge during charge and discharge after the battery is left standing at high temperature in a charged state, for example. The positive electrode for a nonaqueous electrolyte secondary battery includes a positive electrode active material. The positive electrode active material includes a mixture of lithium nickel cobalt manganate and lithium cobaltate having a compound adhered to part of a surface thereof, the compound containing fluorine and at least one selected from zirconium, magnesium, titanium, aluminum, and a rare earth element; and a ratio of the lithium nickel cobalt manganate relative to a total amount of the positive electrode active material is 1% by mass or more and less than 70% by mass.
    Type: Application
    Filed: January 23, 2014
    Publication date: January 14, 2016
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Taiki Satow, Takao Kokubu, Taizou Sunano, Takeshi Ogasawara
  • Publication number: 20140147740
    Abstract: Provided is a positive electrode active material for a nonaqueous electrolyte secondary battery in which generation of gas resulting from a reaction between a lithium transition metal complex oxide and an electrolyte is suppressed even when the battery is stored at high temperature, thereby improving the reliability of the battery, suppressing deterioration of the lithium transition metal complex oxide, and suppressing the decrease in battery capacity. In the positive electrode active material, a compound containing zirconium and fluorine is attached to a surface of lithium cobaltate. This positive electrode active material can be produced by spraying a solution containing zirconium and fluorine onto lithium cobaltate while stirring lithium cobaltate.
    Type: Application
    Filed: July 27, 2012
    Publication date: May 29, 2014
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Takao Kokubu, Hiroyuki Matsumoto, Takeshi Ogasawara
  • Publication number: 20130337321
    Abstract: An object of the present invention is to provide a positive electrode for a nonaqueous electrolyte secondary battery capable of significantly improving cycling characteristics while decreasing production cost, a method for producing the positive electrode, and a nonaqueous electrolyte secondary battery using the positive electrode. The positive electrode includes a positive-electrode current collector, and a positive-electrode mixture layer formed on at least one of the surfaces of the positive-electrode current collector, wherein the positive-electrode mixture layer contains a positive electrode active material, a binder, a conductive agent, and at least one compound selected from the compound group consisting of rare earth acetic acid compounds, rare earth nitric acid compounds, and rare earth sulfuric acid compounds.
    Type: Application
    Filed: December 27, 2011
    Publication date: December 19, 2013
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Hiroyuki Matsumoto, Takeshi Ogasawara, Daizo Jito, Takao Kokubu
  • Patent number: 8220324
    Abstract: Identification information for identifying a tire, a tire inner pressure and a tire inner temperature are sent to a tire checking device from a first electronic device provided within a tire and measured results are shown on a display. Groove depth data from a depth meter are also received by the tire checking device and shown on the display. The tire checking device stores received management information such as a tire inner pressure, a tire inner temperature, a groove depth and so on in a memory with associating them with each tire. The stored management information is extracted by a control unit if required and shown on the display. Therefore, a tire inner pressure and a tire inner temperature are detected automatically and groove depth data are stored with being associated with each tire, and thereby the tire inner pressure, the tire inner temperature and the groove depth data can be displayed.
    Type: Grant
    Filed: December 28, 2006
    Date of Patent: July 17, 2012
    Assignee: Bridgestone Corporation
    Inventors: Takao Kokubu, Hiromasa Hada, Shigeru Yamaguchi
  • Patent number: 8138904
    Abstract: An elastic member 11 positioned between an inner surface of a casing 2 and a front face of a pressure sensing portion 8 of a pressure sensor 1 reduces a possibility of liquid and foreign matters in a tire directly reaching the pressure sensing portion 8. The elastic member also increases adhesiveness between the pressure sensing portion 8 of the pressure sensor 1 and a labyrinth structure and further prevents a potting agent 9b from flowing into the sensing portion 8. Moreover, the elastic member 11 is a member constituting at least a part of the labyrinth structure, so that it does not need that a wall is provided on the pressure sensor 1 and a dedicated seal member is provided on the pressure sensing portion 8.
    Type: Grant
    Filed: August 10, 2007
    Date of Patent: March 20, 2012
    Assignee: Bridgestone Corporation
    Inventors: Shigeru Yamaguchi, Takao Kokubu
  • Patent number: 8059279
    Abstract: Disclosed is a tire surface inspecting technique capable of surely discriminating rubber pieces of a quality different from that of a tire embedded in the surface of the tire by vulcanization from the tire. A first illuminating unit 11 include paired first light projectors 11a and 11b that project light respectively from opposite sides toward an objective line L on a tire T. A second illuminating unit 12 include paired second light projectors 12a and 12b that project light respectively from opposite sides toward the objective line L in a direction different from that in which the first illuminating unit 11 project light. The first illuminating unit 11 and the second illuminating unit 12 operate alternately for illumination. The line camera 3 forms an image of a part of the surface of the tire corresponding to the objective line L in synchronism with the respective illuminating operations of the first and second illuminating unit.
    Type: Grant
    Filed: October 23, 2007
    Date of Patent: November 15, 2011
    Assignee: Bridgestone Corporation
    Inventors: Hirotaka Iino, Tomoyuki Kaneko, Takao Kokubu
  • Patent number: 7997129
    Abstract: A split mold for vulcanizing a tire is held at a mold holding section, which is held on a rotatable base, and then a measuring section measures distances to an inner surface of the split mold in the inside diameter direction and in the axial direction. An operating section acquires two-dimensional geometric data of the inner surface of the split mold from the distances measured above, and further acquires geometric data over the entire circumference by rotating the rotatable base, and the data are combined to acquire three-dimensional geometric data of the inner surface of the split mold and make reference geometric data for tire inspection.
    Type: Grant
    Filed: July 23, 2007
    Date of Patent: August 16, 2011
    Assignee: Bridgestone Corporation
    Inventors: Tetsuya Sukegawa, Takao Kokubu
  • Publication number: 20100148950
    Abstract: An elastic member 11 positioned between an inner surface of a casing 2 and a front face of a pressure sensing portion 8 of a pressure sensor 1 reduces a possibility of liquid and foreign matters in a tire directly reaching the pressure sensing portion 8. The elastic member also increases adhesiveness between the pressure sensing portion 8 of the pressure sensor 1 and a labyrinth structure and further prevents a potting agent 9b from flowing into the sensing portion 8. Moreover, the elastic member 11 is a member constituting at least a part of the labyrinth structure, so that it does not need that a wall is provided on the pressure sensor 1 and a dedicated seal member is provided on the pressure sensing portion 8.
    Type: Application
    Filed: August 10, 2007
    Publication date: June 17, 2010
    Applicant: Bridgestone Corproation
    Inventors: Shigeru Yamaguchi, Takao Kokubu