Patents by Inventor Kimihiko Ito
Kimihiko Ito 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: 20220255085Abstract: The present invention addresses the problem of providing: a porous carbon structure that has a high micropore volume and can be self-contained; a manufacturing method therefor; a positive electrode material using the same; and a battery (particularly an air battery) using the same. The present invention is a porous carbon structure that is for a positive electrode for an air battery and has voids and a skeleton formed by incorporating carbon, the porous carbon structure satisfying all of the following conditions (a) to (d). (a) The t-plot external specific surface area is within the range of 300m2/g to 1600m2/g; (b) the total volume of micropores having a diameter of lnm to 200 nm is within the range of 1.2 cm3/g to 7.0cm3/g; (c) the total volume of micropores having a diameter of lnm to 1000 nm is within the range of 2.3cm3/g to 10.0 cm3/g; and (d) the overall porosity is within the range of 80% to 99%.Type: ApplicationFiled: May 21, 2020Publication date: August 11, 2022Applicant: National Institute for Materials ScienceInventors: Eiki Yasukawa, Takashi Kameda, Shoichi Matsuda, Shoji Yamaguchi, Shin Kimura, Kimihiko Ito, Yoshimi Kubo
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Patent number: 11329320Abstract: The present invention has for its object to provide a non-aqueous electrolyte for lithium air batteries capable of simultaneously holding back positive electrode overvoltage, reactions of the negative electrode with the electrolyte and dendrite growth during charging thereby making an improvement in the output performance, and a lithium air battery using the same. The invention provides a non-aqueous electrolyte for lithium air batteries, containing an organic solvent and a lithium salt. The lithium salt contains at least LiX (where X stands for Br and/or I) and lithium nitrate. The molar concentration (mol/L) of LiX in the non-aqueous electrolyte satisfies a range of no less than 0.005 to no greater than 2.0, and the molar concentration (mol/L) of the lithium nitrate in the non-aqueous electrolyte satisfies a range of greater than 0.1 to no greater than 2.0.Type: GrantFiled: May 7, 2018Date of Patent: May 10, 2022Assignee: NATIONAL INSTITUTE FOR MATERIALS SCIENCEInventors: Yoshimi Kubo, Xing Xin, Kimihiko Ito
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Publication number: 20200161709Abstract: The present invention has for its object to provide a non-aqueous electrolyte for lithium air batteries capable of simultaneously holding back positive electrode overvoltage, reactions of the negative electrode with the electrolyte and dendrite growth during charging thereby making an improvement in the output performance, and a lithium air battery using the same. The invention provides a non-aqueous electrolyte for lithium air batteries, containing an organic solvent and a lithium salt. The lithium salt contains at least LiX (where X stands for Br and/or I) and lithium nitrate. The molar concentration (mol/L) of LiX in the non-aqueous electrolyte satisfies a range of no less than 0.005 to no greater than 2.0, and the molar concentration (mol/L) of the lithium nitrate in the non-aqueous electrolyte satisfies a range of greater than 0.1 to no greater than 2.0.Type: ApplicationFiled: May 7, 2018Publication date: May 21, 2020Inventors: Yoshimi KUBO, Xing XIN, Kimihiko ITO
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Patent number: 9564645Abstract: A containment vessel of a thin lithium-air battery with improved safety is provided. By using the containment vessel, an explosive reaction (ignition) of the electrolyte including lithium metal or ion can be suppressed. The containment vessel (1001) includes: a containment chamber (201) containing the thin lithium-air battery (101). It further includes: a first gas pipe (202B) and a second gas pipe (202D) communicated with an inside of the containment chamber (201); a third gas pipe (202A) and a fourth gas pipe (202C) communicated with an inside of the thin lithium-air battery (101); and a valve (204C) that is provided to the third gas pipe (202A) and controls opening and closing of communication to the containment chamber (201), wherein an inert gas supply source is provided to the first gas pipe (202B), and an air or oxygen supply source is provided to the third gas pipe (202A).Type: GrantFiled: November 21, 2012Date of Patent: February 7, 2017Assignee: NATIONAL INSTITUTE FOR MATERIALS SCIENCEInventors: Kimihiko Ito, Yoshimi Kubo
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Patent number: 9070876Abstract: A variable resistance element is formed by sandwiching a metal oxide layer whose resistance changes between a pair of electrodes and the metal oxide layer includes a pair of variable resistance layers whose resistances change by formation of a current path and a branching suppression layer which is sandwiched between the variable resistance layers and suppresses branching of the current path.Type: GrantFiled: November 15, 2011Date of Patent: June 30, 2015Assignee: NEC CorporationInventor: Kimihiko Ito
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Patent number: 8946668Abstract: Disclosed is a semiconductor device including a resistive change element between a first wiring and a second wiring, which are arranged in a vertical direction so as to be adjacent to each other, with an interlayer insulation film being interposed on a semiconductor substrate. The resistive change element includes a lower electrode, a resistive change element film made of a metal oxide and an upper electrode. Since the upper electrode on the resistive change element film is formed as part of a plug for the second wiring, a structure in which a side surface of the upper electrode is not in direct contact with the side surface of the metal oxide or the lower electrode is provided so that it is possible to realize excellent device characteristics, even when a byproduct is adhered to the side wall of the metal oxide or the lower electrode in the etching thereof.Type: GrantFiled: January 21, 2011Date of Patent: February 3, 2015Assignee: NEC CorporationInventors: Yukishige Saito, Kimihiko Ito, Hiromitsu Hada
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Publication number: 20150024291Abstract: A containment vessel of a thin lithium-air battery with improved safety is provided. By using the containment vessel, an explosive reaction (ignition) of the electrolyte including lithium metal or ion can be suppressed. The containment vessel (1001) includes: a containment chamber (201) containing the thin lithium-air battery (101). It further includes: a first gas pipe (202B) and a second gas pipe (202D) communicated with an inside of the containment chamber (201); a third gas pipe (202A) and a fourth gas pipe (202C) communicated with an inside of the thin lithium-air battery (101); and a valve (204C) that is provided to the third gas pipe (202A) and controls opening and closing of communication to the containment chamber (201), wherein an inert gas supply source is provided to the first gas pipe (202B), and an air or oxygen supply source is provided to the third gas pipe (202A).Type: ApplicationFiled: November 21, 2012Publication date: January 22, 2015Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCEInventors: Kimihiko Ito, Yoshimi Kubo
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Publication number: 20130341585Abstract: A variable resistance element is formed by sandwiching a metal oxide layer whose resistance changes between a pair of electrodes and the metal oxide layer includes a pair of variable resistance layers whose resistances change by formation of a current path and a branching suppression layer which is sandwiched between the variable resistance layers and suppresses branching of the current path.Type: ApplicationFiled: November 15, 2011Publication date: December 26, 2013Applicant: NEC CorporationInventor: Kimihiko Ito
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Patent number: 8391050Abstract: To provide a resistance change element which can reduce the current required to switch the state to the high resistance state from the low resistance state. The resistance change element according to the exemplary embodiment includes three or more electrodes, none of the electrodes supplying ion to a resistance change material (205). It includes a material (206) which does not show resistance change arranged between an electrode (207) and the resistance change material (205), and current pathways formed at two electrodes (204) other than the electrode (207).Type: GrantFiled: March 18, 2009Date of Patent: March 5, 2013Assignee: NEC CorporationInventor: Kimihiko Ito
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Patent number: 8362456Abstract: To use a resistance change element having an MIM structure, which is obtained by stacking a metal, a metal oxide, and a metal, as a switching element, it is necessary to achieve OFF resistance higher than that required in a memory element by a factor of at least 1000. On the other hand, when a resistance change element is used as a memory element and when the difference between the ON resistance and the OFF resistance is a large value, high performance, for example, a short readout time, can be achieved. The present invention therefore provides a resistance change element capable of maintaining low ON resistance and achieving high OFF resistance. High OFF resistance can be achieved while low ON resistance is maintained by adding a second metal that is not contained in a metal oxide, which is a resistance change material, the second metal being capable of charge-compensating for metal deficiency or oxygen deficiency.Type: GrantFiled: March 21, 2008Date of Patent: January 29, 2013Assignee: NEC CorporationInventors: Kimihiko Ito, Hiroshi Sunamura, Yuko Yabe
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Publication number: 20120286231Abstract: Disclosed is a semiconductor device including a resistive change element between a first wiring and a second wiring, which are arranged in a vertical direction so as to be adjacent to each other, with an interlayer insulation film being interposed on a semiconductor substrate. The resistive change element includes a lower electrode, a resistive change element film made of a metal oxide and an upper electrode. Since the upper electrode on the resistive change element film is formed as part of a plug for the second wiring, a structure in which a side surface of the upper electrode is not in direct contact with the side surface of the metal oxide or the lower electrode is provided so that it is possible to realize excellent device characteristics, even when a byproduct is adhered to the side wall of the metal oxide or the lower electrode in the etching thereof.Type: ApplicationFiled: January 21, 2011Publication date: November 15, 2012Applicant: NEC CORPORATIONInventors: Yukishige Saito, Kimihiko Ito, Hiromitsu Hada
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Semiconductor memory device having variable resistance element and method for manufacturing the same
Patent number: 8049204Abstract: A semiconductor memory device includes a variable resistance element including a first electrode, a current path forming region, and a second electrode. The current path forming region includes a first region made of a variable resistance material whose resistivity changes by applying voltage, and a second region formed by doping a metal element to the variable resistance material such that a resistivity of the second region is higher than that of the first region and is not changed by applying a voltage used to change the resistivity of the first region. The first region is in contact with the first electrode and the second electrode, and extends from one electrode side to the other electrode side. The second region is provided outside the first region in at least part of the current path forming region in direction extending from one electrode side to the other electrode side.Type: GrantFiled: February 18, 2008Date of Patent: November 1, 2011Assignee: NEC CorporationInventor: Kimihiko Ito -
Publication number: 20110007555Abstract: To provide a resistance change element which can reduce the current required to switch the state to the high resistance state from the low resistance state. The resistance change element according to the exemplary embodiment includes three or more electrodes, none of the electrodes supplying ion to a resistance change material (205). It includes a material (206) which does not show resistance change arranged between an electrode (207) and the resistance change material (205), and current pathways formed at two electrodes (204) other than the electrode (207).Type: ApplicationFiled: March 18, 2009Publication date: January 13, 2011Inventor: Kimihiko Ito
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Publication number: 20100078615Abstract: A semiconductor memory device includes a variable resistance element including a first electrode, a current path forming region, and a second electrode. The current path forming region includes a first region made of a variable resistance material whose resistivity changes by applying voltage, and a second region formed by doping a metal element to the variable resistance material such that a resistivity of the second region is higher than that of the first region and is not changed by applying a voltage used to change the resistivity of the first region. The first region is in contact with the first electrode and the second electrode, and extends from one electrode side to the other electrode side. The second region is provided outside the first region in at least part of the current path forming region in direction extending from one electrode side to the other electrode side.Type: ApplicationFiled: February 18, 2008Publication date: April 1, 2010Inventor: Kimihiko Ito
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Publication number: 20100059730Abstract: To use a resistance change element having an MIM structure, which is obtained by stacking a metal, a metal oxide, and a metal, as a switching element, it is necessary to achieve OFF resistance higher than that required in a memory element by a factor of at least 1000. On the other hand, when a resistance change element is used as a memory element and when the difference between the ON resistance and the OFF resistance is a large value, high performance, for example, a short readout time, can be achieved. The present invention therefore provides a resistance change element capable of maintaining low ON resistance and achieving high OFF resistance. High OFF resistance can be achieved while low ON resistance is maintained by adding a second metal that is not contained in a metal oxide, which is a resistance change material, the second metal being capable of charge-compensating for metal deficiency or oxygen deficiency.Type: ApplicationFiled: March 21, 2008Publication date: March 11, 2010Inventors: Kimihiko Ito, Hiroshi Sunamura, Yuko Yabe
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Publication number: 20100038619Abstract: A variable resistance element includes a first conductive portion; an insulating film pattern provided on the first conductive portion; a level difference with respect to the upper surface of the first conductive portion, the level difference being formed of the insulating film pattern; a variable resistance film provided on a side surface of the level difference and having contact with the upper surface of the first conductive portion on the lower-end side of the side surface of the level difference; and a second conductive portion having contact with the variable resistance film on the upper-end side of the side surface of the level difference.Type: ApplicationFiled: March 14, 2008Publication date: February 18, 2010Inventors: Ayuka Tada, Kimihiko Ito