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).
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Publication number: 20170077555Abstract: 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: ApplicationFiled: November 22, 2016Publication date: March 16, 2017Applicant: NGK INSULATORS, LTD.Inventors: Hiroshi HAYASHI, Naohito YAMADA, Kenshin KITOH
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Publication number: 20170012334Abstract: 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: ApplicationFiled: September 26, 2016Publication date: January 12, 2017Applicant: NGK INSULATORS, LTD.Inventors: Yoshihiko YAMAMURA, Tatsuya HATTORI, Naomi SAITO, Naohito YAMADA
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Publication number: 20160294018Abstract: Provided is a highly reliable nickel-zinc battery including a separator exhibiting hydroxide ion conductivity and water impermeability.Type: ApplicationFiled: June 9, 2016Publication date: October 6, 2016Applicant: NGK INSULATORS, LTD.Inventors: Hiroshi HAYASHI, Naohito YAMADA, Kenshin KITOH
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Publication number: 20160276714Abstract: Provided is a highly reliable nickel-zinc battery including a separator exhibiting hydroxide ion conductivity and water impermeability.Type: ApplicationFiled: June 1, 2016Publication date: September 22, 2016Applicant: NGK INSULATORS, LTD.Inventors: Hiroshi HAYASHI, Naohito YAMADA, Kenshin KITOH
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Patent number: 9391349Abstract: The present invention provides a lithium-air secondary battery that is capable of effectively preventing deterioration of an alkaline electrolytic solution, air electrode, and negative electrode and has a long life and high long-term reliability. The lithium-air secondary battery comprises an air electrode 12 functioning as a positive electrode, an anion exchanger 14 provided in close contact with one side of the air electrode and composed of a hydroxide-ion conductive inorganic solid electrolyte, a separator 16 provided away from the anion exchanger and composed of a lithium-ion conductive inorganic solid electrolyte, a negative electrode 18 provided so as to be capable of supplying and receiving lithium ions to and from the separator and comprising lithium, and an alkaline electrolytic solution 20 filled between the anion exchanger and the separator.Type: GrantFiled: October 7, 2014Date of Patent: July 12, 2016Assignee: NGK Insulators, Ltd.Inventors: Naohito Yamada, Kazuhiro Yamamoto, Kenshin Kitoh
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Publication number: 20160141582Abstract: 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: ApplicationFiled: January 27, 2016Publication date: May 19, 2016Inventors: Megumi FUJISAKI, Naomi SAITO, Naohito YAMADA, Sho YAMAMOTO
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Patent number: 9293791Abstract: Provide is a zinc secondary battery capable of preventing a short circuit between the positive and negative electrodes caused by zinc dendrites. The zinc secondary battery of the present invention comprises a positive electrode; a negative electrode containing zinc; an electrolytic solution in which the positive electrode and the negative electrode are immersed or with which the positive electrode and the negative electrode are in contact, wherein the electrolytic solution is an aqueous solution containing an alkali metal hydroxide; and a separator being placed between the positive electrode and the negative electrode and separating the positive electrode and the negative electrode from each other, wherein the separator comprises an inorganic solid electrolyte body having hydroxide ion conductivity.Type: GrantFiled: July 3, 2014Date of Patent: March 22, 2016Assignee: NGK Insulators, Ltd.Inventors: Naohito Yamada, Kazuhiro Yamamoto, Takahiro Tomita, Haruo Otsuka
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Publication number: 20150340680Abstract: Provided is a layered double hydroxide oriented membrane in which layered double hydroxide plate-like particles are highly oriented in the approximately perpendicular direction and which is also suitable for densification. The layered double hydroxide oriented membrane of the present invention is composed of a layered double hydroxide represented by the general formula: M2+1-xM3+x(OH)2An?x/n.mH2O wherein M2+ is a divalent cation, M3+ is a trivalent cation, An? is an anion having a valency of n, n is an integer of 1 or greater, x is 0.1 to 0.4, and m is 0 or greater, wherein when a surface of the oriented membrane is measured by X-ray diffractometry, a peak of a (003) plane is not substantially detected or is detected to be smaller than a peak of a (012) plane.Type: ApplicationFiled: July 31, 2015Publication date: November 26, 2015Inventors: Megumi FUJISAKI, Naomi SAITO, Naohito YAMADA
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Patent number: 9070953Abstract: Provided is a zinc-air secondary battery capable of preventing both of the short-circuiting between positive and negative electrodes caused by zinc dendrites and the carbon dioxide incorporation. This zinc-air secondary battery includes an air electrode (12) functioning as a positive electrode; an inorganic solid electrolyte body (14) provided in direct contact with one side of the air electrode and having hydroxide ion conductivity; a metal negative electrode (16) provided opposite to the air electrode with respect to the inorganic solid electrolyte body and comprising zinc or a zinc alloy; and an electrolyte solution in which the metal negative electrode is immersed, the electrolyte solution being separated from the air electrode by the inorganic solid electrolyte body.Type: GrantFiled: April 22, 2014Date of Patent: June 30, 2015Assignee: NGK Insulators, Ltd.Inventors: Naohito Yamada, Kazuhiro Yamamoto, Takahiro Tomita
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Publication number: 20150024292Abstract: The present invention provides a lithium-air secondary battery that is capable of effectively preventing deterioration of an alkaline electrolytic solution, air electrode, and negative electrode and has a long life and high long-term reliability. The lithium-air secondary battery comprises an air electrode 12 functioning as a positive electrode, an anion exchanger 14 provided in close contact with one side of the air electrode and composed of a hydroxide-ion conductive inorganic solid electrolyte, a separator 16 provided away from the anion exchanger and composed of a lithium-ion conductive inorganic solid electrolyte, a negative electrode 18 provided so as to be capable of supplying and receiving lithium ions to and from the separator and comprising lithium, and an alkaline electrolytic solution 20 filled between the anion exchanger and the separator.Type: ApplicationFiled: October 7, 2014Publication date: January 22, 2015Inventors: Naohito YAMADA, Kazuhiro YAMAMOTO, Kenshin KITOH
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Publication number: 20140315099Abstract: Provide is a zinc secondary battery capable of preventing a short circuit between the positive and negative electrodes caused by zinc dendrites. The zinc secondary battery of the present invention comprises a positive electrode; a negative electrode containing zinc; an electrolytic solution in which the positive electrode and the negative electrode are immersed or with which the positive electrode and the negative electrode are in contact, wherein the electrolytic solution is an aqueous solution containing an alkali metal hydroxide; and a separator being placed between the positive electrode and the negative electrode and separating the positive electrode and the negative electrode from each other, wherein the separator comprises an inorganic solid electrolyte body having hydroxide ion conductivity.Type: ApplicationFiled: July 3, 2014Publication date: October 23, 2014Inventors: Naohito YAMADA, Kazuhiro YAMAMOTO, Takahiro TOMITA, Haruo OTSUKA
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Publication number: 20140227616Abstract: Provided is a zinc-air secondary battery capable of preventing both of the short-circuiting between positive and negative electrodes caused by zinc dendrites and the carbon dioxide incorporation. This zinc-air secondary battery includes an air electrode (12) functioning as a positive electrode; an inorganic solid electrolyte body (14) provided in direct contact with one side of the air electrode and having hydroxide ion conductivity; a metal negative electrode (16) provided opposite to the air electrode with respect to the inorganic solid electrolyte body and comprising zinc or a zinc alloy; and an electrolyte solution in which the metal negative electrode is immersed, the electrolyte solution being separated from the air electrode by the inorganic solid electrolyte body.Type: ApplicationFiled: April 22, 2014Publication date: August 14, 2014Applicant: NGK INSULATORS, LTD.Inventors: Naohito YAMADA, Kazuhiro YAMAMOTO, Takahiro TOMITA
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Patent number: 8231985Abstract: The aluminum-nitride-based composite material according to the present invention is an aluminum-nitride-based composite material that is highly pure with the content ratios of transition metals, alkali metals, and boron, respectively as low as 1000 ppm or lower, has AlN and MgO constitutional phases, and additionally contains at least one selected from the group consisting of a rare earth metal oxide, a rare earth metal-aluminum complex oxide, an alkali earth metal-aluminum complex oxide, a rare earth metal oxyfluoride, calcium oxide, and calcium fluoride, wherein the heat conductivity is in the range of 40 to 150 W/mK, the thermal expansion coefficient is in the range of 7.3 to 8.4 ppm/° C., and the volume resistivity is 1×1014 ?·cm or higher.Type: GrantFiled: November 3, 2011Date of Patent: July 31, 2012Assignee: NGK Insulators, Ltd.Inventors: Yoshimasa Kobayashi, Akira Goto, Yuji Katsuda, Naohito Yamada
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Patent number: 8226865Abstract: The aluminum-nitride-based composite material according to the present invention is an aluminum-nitride-based composite material that is highly pure with the content ratios of transition metals, alkali metals, and boron, respectively as low as 1000 ppm or lower, has AlN and MgO constitutional phases, and additionally contains at least one selected from the group consisting of a rare earth metal oxide, a rare earth metal-aluminum complex oxide, an alkali earth metal-aluminum complex oxide, a rare earth metal oxyfluoride, calcium oxide, and calcium fluoride, wherein the heat conductivity is in the range of 40 to 150 W/mK, the thermal expansion coefficient is in the range of 7.3 to 8.4 ppm/° C., and the volume resistivity is 1×1014 ?·cm or higher.Type: GrantFiled: October 19, 2009Date of Patent: July 24, 2012Assignee: NGK Insulators, Ltd.Inventors: Yoshimasa Kobayashi, Akira Goto, Yuji Katsuda, Naohito Yamada
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Publication number: 20120052326Abstract: The aluminum-nitride-based composite material according to the present invention is an aluminum-nitride-based composite material that is highly pure with the content ratios of transition metals, alkali metals, and boron, respectively as low as 1000 ppm or lower, has AlN and MgO constitutional phases, and additionally contains at least one selected from the group consisting of a rare earth metal oxide, a rare earth metal-aluminum complex oxide, an alkali earth metal-aluminum complex oxide, a rare earth metal oxyfluoride, calcium oxide, and calcium fluoride, wherein the heat conductivity is in the range of 40 to 150 W/mK, the thermal expansion coefficient is in the range of 7.3 to 8.4 ppm/° C., and the volume resistivity is 1×1014 ?·cm or higher.Type: ApplicationFiled: November 3, 2011Publication date: March 1, 2012Applicant: NGK Insulators, Ltd.Inventors: Yoshimasa Kobayashi, Akira Goto, Yuji Katsuda, Naohito Yamada
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Publication number: 20100104892Abstract: The aluminum-nitride-based composite material according to the present invention is an aluminum-nitride-based composite material that is highly pure with the content ratios of transition metals, alkali metals, and boron, respectively as low as 1000 ppm or lower, has AlN and MgO constitutional phases, and additionally contains at least one selected from the group consisting of a rare earth metal oxide, a rare earth metal-aluminum complex oxide, an alkali earth metal-aluminum complex oxide, a rare earth metal oxyfluoride, calcium oxide, and calcium fluoride, wherein the heat conductivity is in the range of 40 to 150 W/mK, the thermal expansion coefficient is in the range of 7.3 to 8.4 ppm/° C., and the volume resistivity is 1×1014 ?·cm or higher.Type: ApplicationFiled: October 19, 2009Publication date: April 29, 2010Applicant: NGK Insulators, Ltd.Inventors: Yoshimasa KOBAYASHI, Akira Goto, Yuji Katsuda, Naohito Yamada
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Patent number: 7629282Abstract: A conductive channel formed of an (Sm, Ce)Al11O18 is interconnected in grain boundaries of aluminum nitride (AlN) particles, thereby reducing the temperature dependency of the volume resistivity of an AlN sintered body formed therefrom. At the same time, a solid solution of the AlN particles is formed with at least one of C and Mg, to prevent the conductive channel from moving into the AlN particles, thereby maintaining a high volume resistivity within the AlN particles even at a high temperature.Type: GrantFiled: March 14, 2007Date of Patent: December 8, 2009Assignee: NGK Insulators, Ltd.Inventors: Jun Yoshikawa, Yoshimasa Kobayashi, Naohito Yamada
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Publication number: 20090283933Abstract: A ceramic member is provided, including a ceramic sintered body and a metallic member, which includes a metal element, formed to be in contact with the ceramic sintered body. An affected layer around the metallic member of the ceramic sintered body has a thickness of 300 ?m or less.Type: ApplicationFiled: July 29, 2009Publication date: November 19, 2009Applicant: NGK Insulators, Ltd.Inventors: Yoshimasa Kobayashi, Toru Hayase, Naohito Yamada
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Patent number: 7605102Abstract: An aluminum nitride ceramic including aluminum nitride grains and grain boundary phases comprises a grain boundary phase-rich layer including more amount of the grain boundary phases in a surface layer of the aluminum nitride ceramic than in an inside of the aluminum nitride ceramic. The grain boundary phases in the grain boundary phase-rich layer include at least one of rare earth element and alkali earth element.Type: GrantFiled: February 21, 2007Date of Patent: October 20, 2009Assignee: NGK Insulators, Ltd.Inventors: Yoshimasa Kobayashi, Naohito Yamada, Toru Hayase
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Patent number: 7592280Abstract: An aluminum nitride sintered body is provided, wherein an average crystal grain diameter is 2.0 ?m or less, a crystalline phase detected by an X-ray diffractometer is an AlN phase only or an AlN phase and an AlON phase only, and SiO2 or MgO is present in an amount of more than 0.05 wt % to less than 1 wt %.Type: GrantFiled: March 14, 2007Date of Patent: September 22, 2009Assignee: NGK Insulators, Ltd.Inventors: Yoshimasa Kobayashi, Naohito Yamada