Patents by Inventor Tsuyoshi Okawa

Tsuyoshi Okawa 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: 9450244
    Abstract: A battery capable of improving load characteristics, low-temperature characteristics and high-temperature cycle characteristics is provided. A cathode (13) includes a lithium cobalt complex oxide represented by LiaCoxMIyMIIzO2 (MI includes at least one kind selected from the group consisting of Al, Cr, V, Mn and Fe, MII includes at least one kind selected from the group consisting of Mg and Ca, 0.9?a?1.1, 0.9?x<1, 0.001?y?0.05, 0.001?z?0.05, x+y+z=1), and further includes Zr as a sub-component element. The content of Zr is within a range from 0.01 mol % to 10 mol % both inclusive as a ratio (Zr/Co) of Zr to Co in the lithium cobalt complex oxide.
    Type: Grant
    Filed: March 28, 2006
    Date of Patent: September 20, 2016
    Assignee: Sony Corporation
    Inventors: Kei Yonezawa, Takashi Sato, Tsuyoshi Okawa, Yoshikatsu Yamamoto
  • Publication number: 20090004567
    Abstract: A battery capable of improving load characteristics, low-temperature characteristics and high-temperature cycle characteristics is provided. A cathode (13) includes a lithium cobalt complex oxide represented by LiaCoxMIyMIIzO2 (MI includes at least one kind selected from the group consisting of Al, Cr, V, Mn and Fe, MII includes at least one kind selected from the group consisting of Mg and Ca, 0.9?a?1.1, 0.9?x<1, 0.001?y?0.05, 0.001?z?0.05, x+y+z=1), and further includes Zr as a sub-component element. The content of Zr is within a range from 0.01 mol % to 10 mol % both inclusive as a ratio (Zr/Co) of Zr to Co in the lithium cobalt complex oxide.
    Type: Application
    Filed: March 28, 2006
    Publication date: January 1, 2009
    Applicant: SONY CORPORATION
    Inventors: Kei Yonezawa, Takashi Sato, Tsuyoshi Okawa, Yoshikatsu Yamamoto
  • Patent number: 7122272
    Abstract: A cell in which liquid leakage or destruction may be prevented as the apparent energy density per unit volume of the cell is maintained. The cell uses, as a cathode active material, a compound of an olivinic crystal structure having the formula LixFe1?yMyPO4, where M is at least one selected from the group of Mn, Cr, Co, Cu, Ni, V, Mo, Ti, Zn, Al, Ga, Mg, B and Nb, with 0.05?x?1.2 and 0?y?0.8. By adjusting the amount of the electrolyte solution, the amount of the void in the container is set so as to be not less than 0.14 cc and not more than 0.3 cc per 1 Ah of the cell capacity.
    Type: Grant
    Filed: October 5, 2001
    Date of Patent: October 17, 2006
    Assignee: Sony Corporation
    Inventors: Tsuyoshi Okawa, Mamoru Hosoya, Junji Kuyama, Yuzuru Fukushima
  • Publication number: 20040111873
    Abstract: A method for manufacturing a cathode active material comprising: a mixing step of mixing at least Fe3(PO4)2.nH2O (n designates the number of hydrates and ranges from 0 to 8.) with Li3PO4; and a sintering step of sintering a mixed material obtained in the mixing step when the cathode active material represented by a composition of LixFe1-yMyPO4 (M is at least a kind of materials such as Mn, Cr, Co, Cu, Ni, V, Mo, Ti, Zn, Al, Ga, Mg, B, and Nb, x is located within a range expressed by 0.05≦x≦1.2, and y is located within a range expressed by 0≦y<0.8.) is synthesized, wherein a half-value width of a maximum diffraction peak of the mixed material in an X-ray diffraction using CuK&agr; ray is 1.0° or smaller.
    Type: Application
    Filed: September 26, 2003
    Publication date: June 17, 2004
    Inventors: Tsuyoshi Okawa, Yuzuru Fukushima
  • Patent number: 6656635
    Abstract: A non-aqueous electrolyte secondary cell containing a compound of an olivinic structure as a cathode active material is to be improved in load characteristics and cell capacity. To this end, there is provided a non-aqueous electrolyte secondary cell including a cathode having a layer of a cathode active material containing a compound represented by the general formula LixFe1-yMyPO4, where M is at least one selected from the group consisting of Mn, Cr, Co, Cu, Ni, V, Mo, Ti, Zn, Al, Ga, Mg, B and Nb, with 0.05≦x≦1.2 and 0≦y≦0.8, an anode having a layer of a cathode active material containing the anode active material and a non-aqueous electrolyte, wherein the layer of the cathode active material has a film thickness in a range from 25 to 110 &mgr;m. If a layer of a cathode active material is provided on each surface of a cathode current collector, the sum of the film thicknesses of the layers of the cathode active material ranges between 50 and 220 &mgr;m.
    Type: Grant
    Filed: October 5, 2001
    Date of Patent: December 2, 2003
    Assignee: Sony Corporation
    Inventors: Tsuyoshi Okawa, Mamoru Hosoya, Junji Kuyama, Yuzuru Fukushima
  • Publication number: 20020106563
    Abstract: A cell in which liquid leakage or destruction may be prevented as the apparent energy density per unit volume of the cell is maintained. The cell uses, as a cathode active material, a compound of an olivinic crystal structure having the formula LixFe1−yMyPO4, where M is at least one selected from the group of Mn, Cr, Co, Cu, Ni, V, Mo, Ti, Zn, Al, Ga, Mg, B and Nb and 0.05≦x≦1.2 and 0≦y≦0.8. By adjusting the amount of the electrolyte solution, the amount of the void in the container is set so as to be not less than 0.14 cc and not more than 3.3 cc per 1 Ah of the cell capacity.
    Type: Application
    Filed: October 5, 2001
    Publication date: August 8, 2002
    Inventors: Tsuyoshi Okawa, Mamoru Hosoya, Junji Kuyama, Yuzuru Fukushima
  • Publication number: 20020106564
    Abstract: A non-aqueous electrolyte secondary cell containing a compound of an olivinic structure as a cathode active material is to be improved in load characteristics and cell capacity. To this end, there is provided a non-aqueous electrolyte secondary cell including a cathode having a layer of a cathode active material containing a compound represented by the general formula LixFe1-yMyPO4, where M is at least one selected from the group consisting of Mn, Cr, Co, Cu, Ni, V, Mo, Ti, Zn, Al, Ga, Mg, B and Nb, with 0.05≦x≦1.2 and 0≦y≦0.8, an anode having a layer of a cathode active material containing the anode active material and a non-aqueous electrolyte, wherein the layer of the cathode active material has a film thickness in a range from 25 to 110 &mgr;m. If a layer of a cathode active material is provided on each surface of a cathode current collector, the sum of the film thicknesses of the layers of the cathode active material ranges between 50 and 220 &mgr;m.
    Type: Application
    Filed: October 5, 2001
    Publication date: August 8, 2002
    Inventors: Tsuyoshi Okawa, Mamoru Hosoya, Junji Kuyama, Yuzuru Fukushima