Patents by Inventor Yoshio Ukyo

Yoshio Ukyo 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: 8507130
    Abstract: The present invention provides a water based lithium secondary battery that can inhibit deteriorations in capacity owing to charge-and-discharge operations and maintain a high capacity even after it is charged and discharged repeatedly. The water based lithium secondary battery includes a positive electrode, a negative electrode, a separator 4 sandwiched between these, and an aqueous electrolyte solution obtained by dissolving an electrolyte made of a lithium salt in a water based solvent. As the water based solvent, a pH buffer solution is employed. The buffer solution is obtained by dissolving an acid and its conjugate base's salt, a base and its conjugate acid's salt, a salt made from a weak acid and a strong base, a salt made from a weak base and a strong acid, or a salt made from a weak acid and a weak base in water.
    Type: Grant
    Filed: June 30, 2008
    Date of Patent: August 13, 2013
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Hiroki Kondo, Tsuyoshi Sasaki, Osamu Hiruta, Yuichi Itou, Chikaaki Okuda, Youji Takeuchi, Yoshio Ukyo
  • Publication number: 20100136427
    Abstract: The present invention provides a water based lithium secondary battery that can inhibit deteriorations in capacity owing to charge-and-discharge operations and maintain a high capacity even after it is charged and discharged repeatedly. The water based lithium secondary battery includes a positive electrode, a negative electrode, a separator sandwiched between these, and an aqueous electrolyte solution obtained by dissolving an electrolyte made of a lithium salt in a water based solvent. As the water based solvent, a pH buffer solution is employed. The buffer solution is obtained by dissolving an acid and its conjugate base's salt, a base and its conjugate acid's salt, a salt made from a weak acid and a strong base, a salt made from a weak base and a strong acid, or a salt made from a weak acid and a weak base in water.
    Type: Application
    Filed: June 30, 2008
    Publication date: June 3, 2010
    Applicant: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Hiroki Kondo, Tsuyoshi Sasaki, Osamu Hiruta, Yuichi Itou, Chikaaki Okuda, Youji Takeuchi, Yoshio Ukyo
  • Patent number: 7675291
    Abstract: A battery characteristic detecting method according to the invention includes a first step in which constant current discharge from a battery is performed at a predetermined current value, and a voltage during constant current discharge is measured; a second step in which overpotential for mass transfer control in the battery or resistance for the mass transfer control in the battery is calculated based on the voltage measured in the first step; and a third step in which a determination that a characteristic change has occurred in the battery is made, when the overpotential for the mass transfer control in the battery or the resistance for the mass transfer control in the battery calculated in the second step is larger than a predetermined threshold value.
    Type: Grant
    Filed: August 18, 2004
    Date of Patent: March 9, 2010
    Assignees: Toyota Jidosha Kabushiki Kaisha, Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Hidehito Matsuo, Tetsuro Kobayashi, Yuichi Itou, Yasuhito Kondo, Yoshio Ukyo, Yoshiaki Kikuchi, Motoyoshi Okumura
  • Publication number: 20080274405
    Abstract: The present invention is to provide a cathode active material for an alkaline battery with a lamellar crystal structure including nickel oxyhydroxide. The cathode active material has a diffraction peak at a position that ranges from 8.4 degrees to 10.4 degrees in diffraction angle 2? by X-ray diffraction using CuK?-rays. In addition, the present invention provides an alkaline battery having a cathode having a cathode active material, an anode having an anode active material, and an alkaline water solution as an electrolytic solution. Furthermore, the present invention provides a manufacturing method for a cathode active material for an alkaline battery with a lamellar crystal structure including nickel oxyhydroxide. The manufacturing method has an oxidation process for manufacturing the cathode active material by oxidizing a starting material made from ?-type nickel hydroxide with a lamellar crystal structure in an airstream including alkaline water solution or alkali.
    Type: Application
    Filed: May 30, 2005
    Publication date: November 6, 2008
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tetsuro Kobayashi, Yasuhito Kondo, Hidehito Matsuo, Tsuyoshi Sasaki, Yuichi Itou, Hiroshi Nozaki, Takamasa Nonaka, Yoshiki Seno, Yoshio Ukyo, Masanori Ito
  • Publication number: 20080254366
    Abstract: An alkaline storage battery 1 has: a cathode 2 containing ?-type nickel hydroxide and/or ?-type nickel oxyhydroxide as a cathode active material; an anode 3 containing an anode active material; and an alkaline aqueous solution as an electrolytic solution 4. The alkaline storage battery 1 is configured to restrain at least part of a crystal structure of the cathode active material from changing due to charging or discharging and to restrain the cathode active material from exhibiting a new diffraction peak at a position that ranges from 8.4 degrees to 10.4 degrees in X-ray diffraction angle 2? by X-ray diffraction using CuK?-rays. It is preferable that an anion-exchange membrane layer 25 should be provided on a surface of the cathode 2.
    Type: Application
    Filed: May 30, 2005
    Publication date: October 16, 2008
    Inventors: Tetsuro Kobayashi, Yasuhito Kondo, Hidehito Matsuo, Tsuyoshi Sasaki, Yuichi Itou, Hiroshi Nozaki, Takamasa Nonaka, Yoshiki Seno, Yoshio Ukyo, Masanori Ito
  • Patent number: 7201999
    Abstract: There is provided a secondary cell having a positive electrode and a negative electrode which is made of solid active materials and an electrolyte layer which has been intervened between the positive electrode and the negative electrode. At least one of solid active materials for constituting the positive electrode and the negative electrode is composed of a mixed oxygen ion and electron conductor capable of inserting and eliminating oxygen ion or absorbing and releasing oxygen.
    Type: Grant
    Filed: September 26, 2003
    Date of Patent: April 10, 2007
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Tsuyoshi Sasaki, Yoji Takeuchi, Hideyuki Nakano, Tetsuro Kobayashi, Yoshio Ukyo
  • Patent number: 7189475
    Abstract: The present invention provides a secondary battery which is less expensive, whose safety is extremely high, which is of large capacity as well as good cyclic characteristic, and which uses an aqueous solution for the electrolytic solution. A lithium secondary battery according to the present invention is constituted by including a positive electrode, formed by binding a positive-electrode raw-material mixture including a positive electrode active material, a negative electrode, formed by binding a negative-electrode raw-material mixture including a negative electrode active material, and an electrolytic solution, comprising an aqueous solution in which a lithium salt is dissolved, said positive electrode active material including at least one of a layered structure lithium-manganese composite oxide whose basic composition is LiMnO2 and an olivine structure lithium-iron composite phosphorus oxide whose basic composition is LiFePO4.
    Type: Grant
    Filed: July 24, 2001
    Date of Patent: March 13, 2007
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Tsuyoshi Sasaki, Yoshio Ukyo, Hideyuki Nakano, Masao Kohzaki
  • Patent number: 7025907
    Abstract: A carbon-containing lithium-iron composite phosphorus oxide for a lithium secondary battery positive electrode active material, includes particles being composed of a lithium-iron composite phosphorus oxide having an olivine structure whose basic composition is LiFePO4, and being composited with carbonaceous fine particles. A process for producing the same includes the steps of mixing a lithium compound making a lithium source, an iron compound making an iron source, a phosphorus-containing ammonium salt making a phosphorus source and carbonaceous fine particles, thereby preparing a mixture, and calcicing the mixture at a temperature of from 600° C. or more to 750° C. or less.
    Type: Grant
    Filed: May 14, 2002
    Date of Patent: April 11, 2006
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Masao Kohzaki, Youji Takeuchi, Yoshio Ukyo
  • Publication number: 20040157123
    Abstract: There is provided a secondary cell having a positive electrode and a negative electrode which is made of solid active materials and an electrolyte layer which has been intervened between the positive electrode and the negative electrode. At least one of solid active materials for constituting the positive electrode and the negative electrode is composed of a mixed oxygen ion and electron conductor capable of inserting and eliminating oxygen ion or absorbing and releasing oxygen.
    Type: Application
    Filed: September 26, 2003
    Publication date: August 12, 2004
    Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
    Inventors: Tsuyoshi Sasaki, Yoji Takeuchi, Hideyuki Nakano, Tetsuro Kobayashi, Yoshio Ukyo
  • Publication number: 20030124423
    Abstract: The present invention provides a secondary battery which is less expensive, whose safety is extremely high, which is of large capacity as well as good cyclic characteristic, and which uses an aqueous solution for the electrolytic solution. A lithium secondary battery according to the present invention is constituted by including a positive electrode, formed by binding a positive-electrode raw-material mixture including a positive electrode active material, a negative electrode, formed by binding a negative-electrode raw-material mixture including a negative electrode active material, and an electrolytic solution, comprising an aqueous solution in which a lithium salt is dissolved, said positive electrode active material including at least one of a layered structure lithium-manganese composite oxide whose basic composition is LiMnO2 and an olivine structure lithium-iron composite phosphorus oxide whose basic composition is LiFePO4.
    Type: Application
    Filed: January 24, 2003
    Publication date: July 3, 2003
    Inventors: Tsuyoshi Sasaki, Yoshio Ukyo, Hideyuki Nakano, Masao Kohzaki
  • Publication number: 20020182497
    Abstract: A carbon-containing lithium-iron composite phosphorus oxide for a lithium secondary battery positive electrode active material, includes particles being composed of a lithium-iron composite phosphorus oxide having an olivine structure whose basic composition is LiFePO4, and being composited with carbonaceous fine particles. A process for producing the same includes the steps of mixing a lithium compound making a lithium source, an iron compound making an iron source, a phosphorus-containing ammonium salt making a phosphorus source and carbonaceous fine particles, thereby preparing a mixture, and calcicing the mixture at a temperature of from 600° C. or more to 750° C. or less.
    Type: Application
    Filed: May 14, 2002
    Publication date: December 5, 2002
    Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
    Inventors: Masao Kohzaki, Youji Takeuchi, Yoshio Ukyo
  • Publication number: 20020110518
    Abstract: A lithium transition metal composite oxide for use as a positive active material capable of composing a lithium secondary battery of which the internal resistance does not increase greatly even after stored in a charged state for a long period of time, and a method for readily producing such a lithium transition metal composite oxide. The lithium transition metal composite oxide is composed of a transition metal containing at least one selected from the group consisting of Co, Ni and Mn as a main composition element. The composition of a surface layer of each particle of the lithium transition metal composite oxide is made different from that of an inside of each particle. In one example, the ratio of lithium in the composition of the surface layer of each particle is made greater than that in the average composition of each particle. With the method for producing the lithium transition metal composite oxide, specific raw materials are mixed and fired in two stages.
    Type: Application
    Filed: December 6, 2001
    Publication date: August 15, 2002
    Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
    Inventors: Chikaaki Okuda, Naoko Takechi, Yoshio Ukyo
  • Patent number: 6306542
    Abstract: One of the most important subject of the present invention is to provide a new lithium manganese composite oxide which does not include the cobalt which is few as the resource and expensive. For the above purpose, a lithium manganese composite oxide for a lithium secondary battery cathode active material represented by a composition formula of Li1−x Ax MnO2 (A is an alkali metal except for Li:0<x<1) and having a layered structure with a rock salt type ordered cations is adopted. According to the lithium manganese composite oxide, the crystal structure is stabilized since the lithium site of the layered structure LiMnO2 is replaced by the atom of alkali metal element having larger ionic diameter than the lithium ion. Accordingly, not only large discharge capacity is maintained but the cycle characteristic is excellent. In addition, since the lithium manganese composite oxide does not include the cobalt, it can be manufactured in low cost.
    Type: Grant
    Filed: May 21, 1999
    Date of Patent: October 23, 2001
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Hideyuki Nakano, Yoshio Ukyo, Takahiko Honma
  • Patent number: 5958827
    Abstract: A solid solution particle of oxides contains a solid solution of oxides in which one oxide is dissolved into the other oxide, and in which the degree of dissolution of one oxide into the other oxide is not less 50%, and in which an average diameter of crystallite is not more than 100 nm. The solid solution particle of oxides has small average diameter of a crystallite and large specific surface area, and it improves capacities such as an oxygen storage ability due to high degree of dissolution. A catalyst for purifying exhaust gases has excellent purifying performance by employing the solid solution comprising ceria and zirconia which has large OSC and high oxygen adsorption and discharge speed.
    Type: Grant
    Filed: December 4, 1996
    Date of Patent: September 28, 1999
    Assignees: Toyota Jidosha Kabushiki Kaisha, Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Akihiko Suda, Hideo Sobukawa, Tadashi Suzuki, Toshio Kandori, Yoshio Ukyo, Masahiro Sugiura, Mareo Kimura, Hiroshi Hirayama, Yasuo Ikeda
  • Patent number: 5945369
    Abstract: A catalyst for purifying exhaust gases includes a porous support; a cerium oxide or a solid solution of a cerium oxide and a zirconium oxide in a state of mutual solid solution, loaded on the porous support; and a noble metal element loaded on the porous support. The cerium oxide or the solid solution has an average particle diameter of from 5 to 100 nm. The cerium oxide is present in the solid solution in an amount of from 0.2 to 4.0 by molar ratio with respect to the zirconium oxide therein. The catalyst can be prepared by: coating and calcinating on a support substrate a slurry of a cerium oxide sol, a cerium oxide sol and a zirconium oxide sol, on a solid solution powder of a cerium oxide and a zirconium oxide in a state of mutual solid solution; and loading a noble metal element thereon.
    Type: Grant
    Filed: December 8, 1995
    Date of Patent: August 31, 1999
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Mareo Kimura, Yoriko Matsuoka, Hideo Sobukawa, Masayuki Fukui, Akihiko Suda, Toshio Kandori, Yoshio Ukyo
  • Patent number: 5618772
    Abstract: A method for producing a catalyst having high catalytic activity even at high temperatures of 1200.degree. C. or higher. Fine alumina particles, of which 50% by weight or more have a particle size of 100 nm or less, are mixed with a catalytic component and a substance of inhibiting the sintering of fine alumina particles to form a slurry mixture. This slurry is dried and then calcined to obtain a porous catalyst. The fine alumina particles in the porous catalyst have a large specific surface area even at high temperatures and therefore the porous catalyst maintains its high catalytic activity even at high temperatures of 1200.degree. C. or higher.
    Type: Grant
    Filed: April 19, 1995
    Date of Patent: April 8, 1997
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Akihiko Suda, Yoshio Ukyo, Hideo Sobukawa, Toshio Kandori, Masayuki Fukui
  • Patent number: 5523268
    Abstract: A silicon nitride sintered body includes silicon nitride as a principal component, silicon carbide dispersed therein and at least one of boron and boron compounds in an amount of from 0.005 to 0.5% by weight in terms of the weight of boron with respect to the total weight of the sintered body. The addition of boron or boron compounds improves the high-temperature characteristics such as creep resistance of the sintered body.
    Type: Grant
    Filed: December 22, 1994
    Date of Patent: June 4, 1996
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Yoshio Ukyo, Toshio Kandori, Shigetaka Wada
  • Patent number: 5120682
    Abstract: A sintered body of silicon nitride composed of .alpha.'-Si.sub.3 N.sub.4 and .beta.'-Si.sub.3 N.sub.4, the former being represented by the formula Y.sub.x (Si,Al).sub.12 (O,N).sub.16 (where the value of x, which denotes the amount of occluded Y, is in the range of 0<x<0.3), with the value of x for .alpha.'-Si.sub.3 N.sub.4 in the outer part of the sintered body being greater than for .alpha.'-Si.sub.3 N.sub.4 in the inner part of the sintered body. The sintered body will find use as high-temperature structural material owing to its high strength and high toughness.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: June 9, 1992
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Yoshio Ukyo, Shigetaka Wada
  • Patent number: 5081079
    Abstract: A sintered body composed of .alpha.'-silicon nitride and .beta.'-silicon nitride, and having a surface portion which contains a greater proportion of .alpha.'-silicon nitride than its inner portion does. It has high strength and excellent wear resistance. It is produced by preparing a molded body from a sintering material, disposing about the molded body a sintering material which can form a sintered product containing a greater proportion of .alpha.'-silicon nitride than the sintered product of the molded body will, and sintering the molded body and the material disposed about it.
    Type: Grant
    Filed: August 17, 1990
    Date of Patent: January 14, 1992
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Yoshio Ukyo, Shigetaka Wada
  • Patent number: 4978645
    Abstract: A silicon nitride sintered body composed of .alpha.'-silicon nitride and .beta.'-silicon nitride, which are present in the ratio of 0.05-0.50 to 0.50-0.95 in terms of the peak strength ratio of X-ray diffraction, and have very small crystal grain size and specific compositions. The sintered body has high strength and high toughness and is superior in oxidation resistance.
    Type: Grant
    Filed: April 7, 1989
    Date of Patent: December 18, 1990
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Yoshio Ukyo, Shigetaka Wada, Kazumasa Takatori