Patents by Inventor Naohito Yamada

Naohito Yamada 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: 11158906
    Abstract: Provided is a layered double hydroxide (LDH) separator comprising a porous substrate made of a polymeric material; and a LDH with which pores of the porous substrate are plugged. A central region along the thickness of the LDH separator has a lower mean porosity than peripheral regions along the thickness of the LDH separator.
    Type: Grant
    Filed: June 17, 2020
    Date of Patent: October 26, 2021
    Assignee: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Naohito Yamada, Sota Okochi, Shohei Yokoyama, Naoko Inukai
  • Patent number: 11152668
    Abstract: Provided is a layered-double-hydroxide-(LDH) containing composite material including a porous substrate and a high density LDH-containing functional layer on and/or in the porous substrate. The LDH-containing composite material of the present invention includes the porous substrate and the functional layer formed on and/or in the porous substrate. The functional layer contains a layered double hydroxide represented by the general formula M2+1?xM3+x(OH)2An?x/n.mH2O (where M2+ represents a divalent cation, M3+ represents a trivalent cation, An? represents an n-valent anion, n represents an integer not less than 1, x represents a value of 0.1 to 0.4, and m represents a value not less than 0) and has water impermeability.
    Type: Grant
    Filed: April 10, 2018
    Date of Patent: October 19, 2021
    Assignee: NGK Insulators, Ltd.
    Inventors: Megumi Fujisaki, Naomi Saito, Naohito Yamada, Sho Yamamoto
  • Patent number: 11145935
    Abstract: Provided is a layered double hydroxide (LDH) separator including a porous substrate made of a polymeric material; and a LDH with which pores of the porous substrate are plugged. The LDH separator has a mean porosity of 0.03% to less than 1.0%.
    Type: Grant
    Filed: June 17, 2020
    Date of Patent: October 12, 2021
    Assignee: NGK Insulators, Ltd.
    Inventors: Yukihisa Takeuchi, Naohito Yamada, Sota Okochi, Shohei Yokoyama, Naoko Inukai
  • Patent number: 10892530
    Abstract: Disclosed is an air electrode for a metal-air battery, the air electrode including a separator composed of a hydroxide-ion-conductive inorganic solid electrolyte being a dense ceramic material, and an air electrode layer disposed on the separator and containing an air electrode catalyst, an electron-conductive material, and a hydroxide-ion-conductive material, or containing an air electrode catalyst also serving as an electron-conductive material and a hydroxide-ion-conductive material. According to the present invention, the reaction resistance of the air electrode including the dense ceramic separator can be significantly reduced in a metal-air battery while ensuring the desired characteristics of the dense ceramic separator.
    Type: Grant
    Filed: September 26, 2016
    Date of Patent: January 12, 2021
    Assignee: NGK Insulators, Ltd.
    Inventors: Yoshihiko Yamamura, Tatsuya Hattori, Naomi Saito, Naohito Yamada
  • Publication number: 20200313137
    Abstract: Provided is a layered double hydroxide (LDH) separator including a porous substrate made of a polymeric material, and LDH with which pores of the porous substrate are plugged. The LDH separator has a plurality of remaining flattened pores, longitudinal directions of the pores being non-parallel to a thickness direction of the LDH separator.
    Type: Application
    Filed: June 17, 2020
    Publication date: October 1, 2020
    Applicant: NGK INSULATORS, LTD.
    Inventors: Yukihisa TAKEUCHI, Naohito YAMADA, Sota OKOCHI, Shohei YOKOYAMA, Naoko INUKAI
  • Publication number: 20200313133
    Abstract: Provided is a layered double hydroxide (LDH) separator including a porous substrate made of a polymeric material; and a LDH with which pores of the porous substrate are plugged. The LDH separator has a mean porosity of 0.03% to less than 1.0%.
    Type: Application
    Filed: June 17, 2020
    Publication date: October 1, 2020
    Applicant: NGK INSULATORS, LTD.
    Inventors: Yukihisa TAKEUCHI, Naohito YAMADA, Sota OKOCHI, Shohei YOKOYAMA, Naoko INUKAI
  • Publication number: 20200313134
    Abstract: Provided is a layered double hydroxide (LDH) separator comprising a porous substrate made of a polymeric material; and a LDH with which pores of the porous substrate are plugged. A central region along the thickness of the LDH separator has a lower mean porosity than peripheral regions along the thickness of the LDH separator.
    Type: Application
    Filed: June 17, 2020
    Publication date: October 1, 2020
    Applicant: NGK INSULATORS, LTD.
    Inventors: Yukihisa TAKEUCHI, Naohito YAMADA, Sota OKOCHI, Shohei YOKOYAMA, Naoko INUKAI
  • Patent number: 10734685
    Abstract: Provided is a highly reliable nickel-zinc battery including a separator exhibiting hydroxide ion conductivity and water impermeability. The nickel-zinc battery includes a positive electrode containing nickel hydroxide and/or nickel oxyhydroxide; a positive-electrode electrolytic solution in which the positive electrode is immersed, the electrolytic solution containing an alkali metal hydroxide; a negative electrode containing zinc and/or zinc oxide; a negative-electrode electrolytic solution in which the negative electrode is immersed, the electrolytic solution containing an alkali metal hydroxide; a hermetic container accommodating the positive electrode, the positive-electrode electrolytic solution, the negative electrode, and the negative-electrode electrolytic solution; and the separator exhibiting hydroxide ion conductivity and water impermeability and disposed in the hermetic container so as to separate a positive-electrode chamber from a negative-electrode chamber.
    Type: Grant
    Filed: February 7, 2019
    Date of Patent: August 4, 2020
    Assignee: NGK Insulators, Ltd.
    Inventors: Hiroshi Hayashi, Naohito Yamada, Kenshin Kitoh
  • Patent number: 10700385
    Abstract: Provided is a battery including a layered double hydroxide. The battery includes a positive electrode, a negative electrode, an electrolytic solution being an aqueous alkali metal hydroxide solution, and a layered double hydroxide having a fundamental composition represented by the formula: M2+1?xM3+x(OH)2An?x/n·mH2O where M2+ represents a divalent cation, M3+ represents a trivalent cation, An? represents an n-valent anion, n is an integer of 1 or more, x is 0.1 to 0.4, and m is any real number, the layered double hydroxide being in contact with the electrolytic solution, wherein a metal compound containing a metal corresponding to M2+ and/or M3+ is dissolved in the electrolytic solution such that erosion of the layered double hydroxide by the electrolytic solution is suppressed. The present invention provides a highly reliable battery such that the degradation of a layered double hydroxide (LDH) contained in the battery can be significantly reduced.
    Type: Grant
    Filed: March 28, 2017
    Date of Patent: June 30, 2020
    Assignee: NGK Insulators, Ltd.
    Inventors: Shohei Yokoyama, Sho Yamamoto, Naohito Yamada
  • Patent number: 10686177
    Abstract: There is disclosed an electrode cartridge for use in a hermetic zinc secondary battery comprising a separator structure including a separator exhibiting hydroxide ion conductivity and water impermeability; a counter member liquid-tightly sealed to the separator structure so as to form an internal space and constituting an open-top water impermeable case together with the separator structure; and an electrode that is accommodated in the internal space of the water impermeable case and is a negative electrode containing zinc and/or zinc oxide or a positive electrode. According to the present invention, there is provided an electrode built-in component that can reliably isolate the positive and negative electrodes from each other with a hydroxide ion conductive separator, in the form of an electrode cartridge that is easy to handle and manufacture and that is more advantageous for assembling a stacked-cell battery, while reducing the number of sealing joints.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: June 16, 2020
    Assignee: NGK Insulators, Ltd.
    Inventors: Yuichi Gonda, Naohito Yamada, Kenshin Kitoh
  • Patent number: 10601094
    Abstract: Provided is a separator-equipped air electrode for a metal-air battery, the separator-equipped air electrode including a separator composed of a hydroxide-ion-conductive inorganic solid electrolyte being a dense ceramic material; an air electrode layer containing an air electrode catalyst and an electron-conductive material, or containing an air electrode catalyst also serving as an electron-conductive material; and an intermediate layer disposed between the separator and the air electrode layer, improving the adhesion between the separator and the air electrode layer, and exhibiting hydroxide ion conductivity. The present invention enables an air electrode provided with a dense ceramic separator to ensure the desired characteristics of the dense ceramic separator and reduces the resistance of a metal-air battery (in particular, the interfacial resistance between the air electrode layer and the separator).
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: March 24, 2020
    Assignee: NGK Insulators, Ltd.
    Inventors: Tatsuya Hattori, Yoshihiko Yamamura, Naohito Yamada
  • Publication number: 20200028167
    Abstract: There is provided a secondary battery including: a positive electrode containing manganese dioxide and/or manganese hydroxide, a conductive aid, and a hydroxide-ion-conductive inorganic solid electrolyte; a negative electrode containing zinc and/or zinc hydroxide, a conductive aid, and a hydroxide-ion-conductive inorganic solid electrolyte; and a separator containing a hydroxide-ion-conductive inorganic solid electrolyte, the separator separating the positive electrode from the negative electrode.
    Type: Application
    Filed: September 27, 2019
    Publication date: January 23, 2020
    Applicant: NGK INSULATORS, LTD.
    Inventor: Naohito YAMADA
  • Patent number: 10522868
    Abstract: The present invention provides a sequential and efficient method of assembling a battery with a desired number of layers while reliably separating positive and negative electrode sides from each other with one or more separator structures. According to the invention, the method of assembling a battery includes stacking one or multiple combinations each comprising a frame and a positive electrode plate to be disposed in a region defined by the frame and one or multiple combinations each comprising a frame and a negative electrode plate to be disposed in a region defined by the frame, once or alternately, such that the positive and adjacent negative electrode plates are separated from each other by a separator structure and the periphery of the separator structure is held between the adjacent frames. The separator structure includes a separator exhibiting hydroxide ion conductivity and water impermeability.
    Type: Grant
    Filed: September 11, 2017
    Date of Patent: December 31, 2019
    Assignee: NGK INSULATORS, LTD.
    Inventors: Kenshin Kitoh, Naohito Yamada, Kenji Kawamura, Yuichi Gonda
  • Patent number: 10483596
    Abstract: Provided is a secondary battery including a hydroxide-ion-conductive ceramic separator. The secondary battery includes a positive electrode; a negative electrode; an alkaline electrolytic solution; a ceramic separator that is composed of a hydroxide-ion-conductive inorganic solid electrolyte and separates the positive electrode from the negative electrode; a porous substrate disposed on at least one surface of the ceramic separator; and a container accommodating at least the negative electrode and the alkaline electrolytic solution, wherein the inorganic solid electrolyte is in the form of a membrane or layer densified enough to have water impermeability, and the porous substrate has a thickness of 100 to 1,800 ?m. According to the secondary battery of the present invention, the thickness and resistance of the ceramic separator are decreased without concern for reduced strength, and a reduction in energy density and an increase in internal resistance are effectively prevented.
    Type: Grant
    Filed: April 21, 2017
    Date of Patent: November 19, 2019
    Assignee: NGK Insulators, Ltd.
    Inventors: Hiroshi Hayashi, Kenshin Kitoh, Naohito Yamada
  • Patent number: 10446821
    Abstract: Provided is a secondary battery including a positive electrode, a negative electrode, an alkaline electrolytic solution, a separator structure exhibiting water impermeability and separating the positive electrode from the negative electrode, and a container accommodating at least the negative electrode and the alkaline electrolytic solution. The separator structure includes a porous substrate-supported ceramic separator, and a reinforcement having a lattice structure having openings and reinforcing the periphery and/or at least one surface of the porous substrate-supported ceramic separator. The porous substrate-supported ceramic separator includes a ceramic separator composed of an inorganic solid electrolyte having hydroxide ion conductivity in the form of a membrane or layer densified enough to have water impermeability, and a porous substrate disposed on at least one surface of the separator.
    Type: Grant
    Filed: April 26, 2017
    Date of Patent: October 15, 2019
    Assignee: NGK Insulators, Ltd.
    Inventors: Hiroshi Hayashi, Kenshin Kitoh, Naohito Yamada
  • Patent number: 10381689
    Abstract: Provided is a highly reliable nickel-zinc battery including a separator exhibiting hydroxide ion conductivity and water impermeability.
    Type: Grant
    Filed: June 9, 2016
    Date of Patent: August 13, 2019
    Assignee: NGK Insulators, Ltd.
    Inventors: Hiroshi Hayashi, Naohito Yamada, Kenshin Kitoh
  • Patent number: 10370250
    Abstract: Provided is a layered double hydroxide membrane containing a layered double hydroxide represented by the formula: M2+1-xM3+x(OH)2An?x/n.mH2O (where M2+ represents a divalent cation, M3+ represents a trivalent cation, An? represents an n-valent anion, n is an integer of 1 or more, and x is 0.1 to 0.4), the layered double hydroxide membrane having water impermeability. The layered double hydroxide membrane includes a dense layer having water impermeability, and a non-flat surface structure that is rich in voids and/or protrusions and disposed on at least one side of the dense layer. The present invention provides an LDH membrane suitable for use as a solid electrolyte separator for a battery, the LDH membrane including a dense layer having water impermeability, and a specific structure disposed on at least one side of the dense layer and suitable for reducing the interfacial resistance between the LDH membrane and an electrolytic solution.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: August 6, 2019
    Assignee: NGK Insulators, Ltd.
    Inventors: Sho Yamamoto, Megumi Fujisaki, Shohei Yokoyama, Naohito Yamada
  • Publication number: 20190173132
    Abstract: Provided is a highly reliable nickel-zinc battery including a separator exhibiting hydroxide ion conductivity and water impermeability. The nickel-zinc battery includes a positive electrode containing nickel hydroxide and/or nickel oxyhydroxide; a positive-electrode electrolytic solution in which the positive electrode is immersed, the electrolytic solution containing an alkali metal hydroxide; a negative electrode containing zinc and/or zinc oxide; a negative-electrode electrolytic solution in which the negative electrode is immersed, the electrolytic solution containing an alkali metal hydroxide; a hermetic container accommodating the positive electrode, the positive-electrode electrolytic solution, the negative electrode, and the negative-electrode electrolytic solution; and the separator exhibiting hydroxide ion conductivity and water impermeability and disposed in the hermetic container so as to separate a positive-electrode chamber from a negative-electrode chamber.
    Type: Application
    Filed: February 7, 2019
    Publication date: June 6, 2019
    Applicant: NGK INSULATORS, LTD.
    Inventors: Hiroshi HAYASHI, Naohito YAMADA, Kenshin KITOH
  • Patent number: 10297869
    Abstract: Provided is a highly reliable nickel-zinc battery including a separator exhibiting hydroxide ion conductivity and water impermeability. The separator is disposed in a hermetic container to separate a positive-electrode chamber accommodating a positive electrode and a positive-electrode electrolyte from a negative-electrode chamber accommodating a negative electrode and a negative-electrode electrolyte. The positive-electrode chamber has an extra positive-electrode space having a volume that meets a variation in amount of water in association with reaction at the positive electrode during charge and discharge of the battery, and the negative-electrode chamber has an extra negative-electrode space having a volume meeting a variation in amount of water in association with reaction at the negative electrode during charge and discharge of the battery.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: May 21, 2019
    Assignee: NGK Insulators, Ltd.
    Inventors: Hiroshi Hayashi, Naohito Yamada, Kenshin Kitoh
  • Patent number: 10290847
    Abstract: Provided is a separator structure for use in a zinc secondary battery. The separator structure includes a ceramic separator composed of an inorganic solid electrolyte and having hydroxide ion conductivity and water impermeability, and a peripheral member disposed along the periphery of the ceramic separator and composed of at least one of a resin frame and a resin film. The separator structure exhibits water impermeability as a whole. The separator structure of the present invention can reliably separate the positive electrode side from the negative electrode side in a zinc secondary battery, is readily sealed and bonded to a resin battery container, and exhibits significantly improved handleability during the assembly of the battery.
    Type: Grant
    Filed: November 22, 2016
    Date of Patent: May 14, 2019
    Assignee: NGK Insulators, Ltd.
    Inventors: Kenshin Kitoh, Naohito Yamada, Hiroshi Hayashi