Patents by Inventor Motoharu Saito

Motoharu Saito 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).

  • Publication number: 20110200879
    Abstract: A non-aqueous electrolyte secondary battery has a positive electrode containing a positive electrode active material, a negative electrode, and a non-aqueous electrolyte. The positive electrode active material includes a lithium-containing oxide obtained by ion exchanging a portion of sodium contained in a cobalt-containing oxide with lithium, the cobalt-containing oxide represented by the formula Lix1Nay1Co?Mn?MzO? where: M is at least one element selected from the group consisting of Mg, Ni, Zr, Mo, W, Al, Cr, V, Ce, Ti, Fe, K, Ca, and In; 0<x1<0.45; 0.66<y1<0.75; 0.62???0.72; 0.28???0.38; 0?z?0.1; and 1.9???2.1.
    Type: Application
    Filed: February 11, 2011
    Publication date: August 18, 2011
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Motoharu Saito, Masahisa Fujimoto
  • Publication number: 20100248023
    Abstract: A non-aqueous electrolyte battery has a working electrode 1 having a positive electrode active material, a counter electrode 2, and a non-aqueous electrolyte containing lithium. The positive electrode active material includes a lithium pre-doped transition metal oxide prepared by pre-doping lithium into a sodium-containing transition metal oxide having an initial charge-discharge efficiency of higher than 100% as determined by charging and discharging using a lithium metal negative electrode as a counter electrode, and the sodium-containing transition metal oxide is represented by the compositional formula NaaLibMO2±?, where 0.5?a<1.0, 0<b?0.5, 0???0.1, and M is at least one element selected from the group consisting of Ni, Co, and Mn.
    Type: Application
    Filed: March 26, 2010
    Publication date: September 30, 2010
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Sho Tsuruta, Motoharu Saito, Katsunori Yanagida, Masahisa Fujimoto
  • Publication number: 20100248040
    Abstract: A non-aqueous electrolyte secondary battery is provided that has a high discharge capacity and in which the structure is stable even when lithium is extracted to a high potential so that good cycle performance can be obtained. A non-aqueous electrolyte secondary battery has a negative electrode, a non-aqueous electrolyte, and a positive electrode having a positive electrode active material comprising sodium oxide, characterized in that: the sodium oxide contains lithium; and the molar amount of the lithium is less than the molar amount of the sodium.
    Type: Application
    Filed: November 15, 2006
    Publication date: September 30, 2010
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Motoharu Saito, Hideyuki Koga, Katsutoshi Takeda, Masahisa Fujimoto
  • Publication number: 20100239912
    Abstract: A non-aqueous electrolyte secondary battery has a positive electrode containing a positive electrode active material containing a lithium-containing oxide active material, a negative electrode, and a non-aqueous electrolyte. The lithium-containing oxide active material is represented by the general formula LiaMgbMO2±?, where 0.65?a?1.05, 0<b?0.3, 0 ???0.3, and M is at least one of manganese and cobalt.
    Type: Application
    Filed: March 22, 2010
    Publication date: September 23, 2010
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Motoharu Saito, Sho Tsuruta, Masahisa Fujimoto
  • Publication number: 20100173202
    Abstract: A positive electrode active material is formed of a lithium containing layered oxide. The lithium containing layered oxide contains either or both of LiANaBMnxCoyO2±? that belongs to a space group P63mc or LiANaBMnxCoyO2±? that belongs to a space group Cmca. The lithium containing layered oxide contains the LiANaBMnxCoyO2±? as a solid solution, a mixture or both of them. In the LiANaBMnxCoyO2±?, 0.5?A?1.2, 0<B?0.01, 0.40?x?0.55, 0.40?y?0.55, 0.80?x+y?1.10 and 0???0.3.
    Type: Application
    Filed: June 25, 2008
    Publication date: July 8, 2010
    Inventors: Motoharu Saito, Masahisa Fujimoto, Katsutoshi Takeda
  • Publication number: 20100129715
    Abstract: A positive electrode active material is made of sodium containing oxide. The sodium containing oxide contains NaALiBMO2±? that belongs to a space group P63/mmc of a hexagonal system, where the M includes at least one of manganese (Mn) and cobalt (Co). In the NaALiBMO2±?, the composition ratio A of sodium (Na) is not less than 0.5 and not more than 1.1, the composition ratio B of lithium (Li) is larger than 0 and not more than 0.3, and the ? is not less than 0 and not more than 0.3.
    Type: Application
    Filed: March 21, 2008
    Publication date: May 27, 2010
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Motoharu Saito, Katsutoshi Takeda, Masahisa Fujimoto, Hiroshi Sawada
  • Publication number: 20100104944
    Abstract: A mixed positive electrode active material is used. The mixed positive electrode active material is obtained by mixing a layered oxide whose initial charge-discharge efficiency when lithium metal is used for a counter electrode is less than 100% (hereinafter referred to as a first layered oxide) and a layered oxide whose initial charge-discharge efficiency is 100% or more (hereinafter referred to as a second layered oxide). Examples of the first layered oxide include Li1+aMnxCoyNizO2. A sodium oxide such as LiANaBMnXCoYNiZO2 other than a layered compound from which lithium is previously extracted by acid treatment or the like can be used as the second layered oxide whose initial charge-discharge efficiency is 100% or more. A layered oxide obtained by replacing (ion exchange) sodium in the foregoing LiANaBMnXCoYNiZO2 with lithium can be also used as the second layered oxide.
    Type: Application
    Filed: December 26, 2007
    Publication date: April 29, 2010
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Motoharu Saito, Hideyuki Koga, Katsutoshi Takeda, Hiroshi Sawada, Masahisa Fujimoto
  • Patent number: 7695868
    Abstract: The positive electrode active material of a positive electrode includes a sodium-containing transition metal oxide (NaaLibMxO2±?). The M includes at least two of manganese (Mn), iron (Fe), cobalt (Co), and nickel (Ni). For a negative electrode, a sodium metal or a metal that forms an alloy with sodium is used. A non-aqueous electrolyte produced by dissolving an electrolytic salt (sodium salt) in a non-aqueous solvent is used. Examples of the non-aqueous solvent may include a cyclic carbonate, a chain carbonate, esters, cyclic ethers, chain ethers, nitrites, amides and a combination thereof.
    Type: Grant
    Filed: March 19, 2007
    Date of Patent: April 13, 2010
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Takao Inoue, Motoharu Saito, Masahisa Fujimoto, Masaharu Itaya
  • Publication number: 20100081056
    Abstract: A positive electrode active material includes a manganese oxide containing lithium and at least one substance selected from the group consisting of sodium, potassium, and rubidium. The manganese oxide has a strongest peak in the range of 2?=42.0° to 46.0° and a second strongest peak in the range of 2?=64.0° to 66.0°, as determined by X-ray powder diffraction analysis (Cuk?) of the manganese oxide.
    Type: Application
    Filed: September 30, 2009
    Publication date: April 1, 2010
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Motoharu Saito, Masahisa Fujimoto
  • Publication number: 20090011335
    Abstract: A high-capacity positive electrode active material is provided that enables a non-aqueous electrolyte secondary battery to have excellent load characteristics and high initial charge-discharge efficiency. A non-aqueous electrolyte secondary battery has a positive electrode, a negative electrode, and a non-aqueous electrolyte, and performs charge and discharge by transferring lithium ions between the positive electrode and the negative electrode. The positive electrode has a positive electrode mixture and a positive electrode current collector. The positive electrode mixture contains a positive electrode active material, a conductive agent, and a binder agent (binder). The positive electrode active material includes Li1+x?a(MnyM1?y)1?xO2±b, where 0<a<0.3, 0<b<0.1, 0<x<0.4, 0<y<1, and 0.95<1+x?a<1.15, and M is at least one transition metal other than manganese (Mn).
    Type: Application
    Filed: June 25, 2008
    Publication date: January 8, 2009
    Inventors: Katsutoshi Takeda, Motoharu Saito, Hiroshi Sawada, Masahisa Fujimoto
  • Publication number: 20080261115
    Abstract: A non-aqueous electrolyte secondary battery includes a positive electrode having a positive electrode mixture, a negative electrode, and a non-aqueous electrolyte. The positive electrode mixture contains as a positive electrode active material Li1+x(MnyNizCo1?y?z)1?xO2, where 0<x<0.4, 0<y?1, and 0?z?1. The positive electrode mixture has a filling density of from 2.2 g/cm3 to 3.6 g/cm3, and a film thickness of less than 50 ?m.
    Type: Application
    Filed: March 7, 2008
    Publication date: October 23, 2008
    Inventors: Motoharu Saito, Katsutoshi Takeda, Hideyuki Koga, Hiroshi Sawada, Masahisa Fujimoto, Denis Yau Wai Yu
  • Publication number: 20070218361
    Abstract: The positive electrode active material of a positive electrode includes a sodium-containing transition metal oxide (NaaLibMxO2±?). The M includes at least two of manganese (Mn), iron (Fe), cobalt (Co), and nickel (Ni). For a negative electrode, a sodium metal or a metal that forms an alloy with sodium is used. A non-aqueous electrolyte produced by dissolving an electrolytic salt (sodium salt) in a non-aqueous solvent is used. Examples of the non-aqueous solvent may include a cyclic carbonate, a chain carbonate, esters, cyclic ethers, chain ethers, nitrites, amides and a combination thereof.
    Type: Application
    Filed: March 19, 2007
    Publication date: September 20, 2007
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Takao Inoue, Motoharu Saito, Masahisa Fujimoto, Masaharu Itaya
  • Patent number: D565657
    Type: Grant
    Filed: May 25, 2006
    Date of Patent: April 1, 2008
    Assignee: Kuretake Co., Ltd.
    Inventors: Makiko Kitamura, Motoharu Saito, Ryoichi Isono
  • Patent number: D567289
    Type: Grant
    Filed: May 25, 2006
    Date of Patent: April 22, 2008
    Assignee: Kuretake Co., Ltd.
    Inventors: Makiko Kitamura, Motoharu Saito, Ryoichi Isono