Patents by Inventor Masahisa Fujimoto

Masahisa Fujimoto 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: 10741865
    Abstract: A flow battery includes a first liquid, a second liquid, a first electrode immersed in the first liquid, a second electrode being a counter electrode of the first electrode and immersed in the second liquid, and an isolation unit separating the first electrode and the first liquid from the second electrode and the second liquid. Lithium is dissolved in at least one of the first liquid and the second liquid. The first liquid and the second liquid have a property of emitting solvated electrons of lithium and dissolving the lithium as a cation.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: August 11, 2020
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Masahisa Fujimoto, Shuji Ito
  • Publication number: 20190372146
    Abstract: The flow battery in an aspect of the present disclosure includes a first liquid containing a lithium ion and a first redox material, a first electrode in contact with the first liquid, a second electrode functioning as a counter electrode of the first electrode, an isolation unit that isolates the first electrode and the second electrode from each other, a first chamber, and a first circulation mechanism for circulating the first liquid between the first electrode and the first chamber, and in the flow battery, the first liquid is non-aqueous and the first circulation mechanism includes a magnetically driven pump.
    Type: Application
    Filed: August 15, 2019
    Publication date: December 5, 2019
    Inventors: SHUJI ITO, MASAHISA FUJIMOTO, HARUKO KUBOTA, NORIHIKO KAWABATA
  • Patent number: 10476107
    Abstract: A battery includes a positive electrode, a negative electrode containing graphite, and an electrolyte solution containing 2,2?-bipyridyl. The molar ratio of 2,2?-bipyridyl in the electrolyte solution to the graphite is 4.091×10?6 or less.
    Type: Grant
    Filed: June 27, 2017
    Date of Patent: November 12, 2019
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventor: Masahisa Fujimoto
  • Publication number: 20190081336
    Abstract: A flow battery includes: a cell including a first chamber and a second chamber a first liquid that contains a charge mediator and a discharge mediator, and that is located in the first chamber of the cell; a first electrode located in the first chamber of the cell; a first active material that is solid and that is located in the first chamber of the cell; a second liquid located in the second chamber of the cell; a second electrode that is located in the second chamber of the cell, and that is a counter electrode to the first electrode; and a first stirrer that stirs the first liquid in the first chamber. The charge mediator has a lower equilibrium potential than an equilibrium potential of the first active material. The discharge mediator has a higher equilibrium potential than the equilibrium potential of the first active material.
    Type: Application
    Filed: August 24, 2018
    Publication date: March 14, 2019
    Inventors: SHUJI ITO, MASAHISA FUJIMOTO
  • Publication number: 20190058208
    Abstract: A flow battery according to one aspect of the present disclosure includes: a first liquid containing dissolved therein a charge mediator and a discharge mediator; a first electrode immersed in the first liquid; and a first active material immersed in the first liquid. The equilibrium potential of the charge mediator is lower than the equilibrium potential of the first active material, and the equilibrium potential of the discharge mediator is higher than the equilibrium potential of the first active material.
    Type: Application
    Filed: October 23, 2018
    Publication date: February 21, 2019
    Inventors: Masahisa FUJIMOTO, Shuji ITO
  • Publication number: 20190058207
    Abstract: A flow battery includes: a first liquid containing dissolved therein a condensed aromatic compound and lithium; a first electrode immersed in the first liquid; and a first circulator including a first container and a first passage prevention member. The first liquid containing the condensed aromatic compound dissolved therein has the property of causing the lithium to release solvated electrons and dissolve as cations. When the lithium dissolved in the first liquid precipitates on the first electrode, lithium precipitate particles are generated. The first circulator circulates the first liquid between the first electrode and the first container. The first circulator transfers the lithium precipitate particles generated on the first electrode to the first container. The first passage prevention member is disposed in a channel through which the first liquid flows from the first container to the first electrode. The first passage prevention member prevents passage of the lithium precipitate particles.
    Type: Application
    Filed: October 23, 2018
    Publication date: February 21, 2019
    Inventor: MASAHISA FUJIMOTO
  • Publication number: 20180034104
    Abstract: A battery includes a positive electrode, a negative electrode containing graphite, and an electrolyte solution containing 2,2?-bipyridyl. The molar ratio of 2,2?-bipyridyl in the electrolyte solution to the graphite is 4.091×10?6 or less.
    Type: Application
    Filed: June 27, 2017
    Publication date: February 1, 2018
    Inventor: MASAHISA FUJIMOTO
  • Publication number: 20180026293
    Abstract: A flow battery includes a first liquid, a second liquid, a first electrode immersed in the first liquid, a second electrode being a counter electrode of the first electrode and immersed in the second liquid, and an isolation unit separating the first electrode and the first liquid from the second electrode and the second liquid. Lithium is dissolved in at least one of the first liquid and the second liquid. The first liquid and the second liquid have a property of emitting solvated electrons of lithium and dissolving the lithium as a cation.
    Type: Application
    Filed: June 29, 2017
    Publication date: January 25, 2018
    Inventors: MASAHISA FUJIMOTO, SHUJI ITO
  • Patent number: 9825297
    Abstract: A negative-electrode active material for a sodium-ion secondary battery contains a porous carbon material which has a plurality of open pores that extend through to the surface, a plurality of closed pores that do not extend through to the surface, and a solid made of carbon material. The distance between (002) planes of the solid portion is not less than 0.340 nm and not more than 0.410 nm. The plurality of closed pores account for a volume ratio of not less than 0% and not more than 10% with respect to a total volume of the plurality of open pores, the plurality of closed pores, and the solid portion. The plurality of open pores account for a volume ratio of not less than 0% and not more than 50% with respect to a total volume of the plurality of open pores, the plurality of closed pores, and the solid portion.
    Type: Grant
    Filed: May 22, 2014
    Date of Patent: November 21, 2017
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Akira Kano, Nobuhiko Hojo, Masahisa Fujimoto
  • Patent number: 9786949
    Abstract: An object of the present invention or a problem to be solved by the present invention is to provide, as a material for use as a positive electrode of a sodium secondary battery, a novel material that allows the resulting battery to have capacity characteristics superior to those of conventional batteries. The composite metal oxide of the present invention has a composition represented by the general formula NaxMeyO2, where Me is at least one selected from the group consisting of Fe, Mn, and Ni, x satisfies 0.8<x?1.0, and y satisfies 0.95?y<1.05, and consists of a P2 structure. The sodium secondary battery of the present invention includes: a positive electrode (13) containing the composite metal oxide of the present invention; a negative electrode (16) containing a material capable of absorbing and desorbing Na ions; and an electrolyte containing Na ions and anions.
    Type: Grant
    Filed: November 21, 2013
    Date of Patent: October 10, 2017
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Nobuhiko Hojo, Ryuichi Natsui, Akira Kano, Masahisa Fujimoto
  • Patent number: 9755237
    Abstract: A negative-electrode active material for a sodium-ion secondary battery contains a porous carbon material which has a plurality of open pores that extend through to the surface, a plurality of closed pores that do not extend through to the surface, and a solid portion made of carbon material. The distance between (002) planes of carbon in at least a part of the solid portion is 0.36 nm or more. The plurality of closed pores account for a volume ratio of not less than 30% and not more than 90% with respect to a total volume of the plurality of open pores, the plurality of closed pores, and the solid portion.
    Type: Grant
    Filed: May 22, 2014
    Date of Patent: September 5, 2017
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Akira Kano, Nobuhiko Hojo, Masahisa Fujimoto
  • Patent number: 9728784
    Abstract: A method for producing a vitreous carbon material which can serve as a carbon material for a power storage device. In the method, a polymer material, having six-membered ring structures in its basic carbon skeleton and having a nitrogen atom, is heated at a temperature of 1000° C. to 2100° C. under an inert gas environment, and then, the polymer material is pulverized, to thereby control graphitization and crystal growth of the carbon material, thus producing a vitreous carbon material which serves as a carbon material for a power storage device.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: August 8, 2017
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Kiyohiro Hine, Naomi Nishiki, Akira Kano, Masahisa Fujimoto
  • Patent number: 9350045
    Abstract: The nonaqueous electrolyte secondary battery includes: a positive electrode containing a positive-electrode active material; a negative electrode; and a nonaqueous electrolyte. The positive-electrode active material contains a lithium-containing oxide obtained by ion-exchanging part of sodium in a cobalt-containing oxide containing lithium, sodium, and titanium with lithium.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: May 24, 2016
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Motoharu Saito, Shinnosuke Ichikawa, Katsunori Yanagida, Masahisa Fujimoto
  • Publication number: 20160126550
    Abstract: A negative-electrode active material for a sodium-ion secondary battery contains a porous carbon material which has a plurality of open pores that extend through to the surface, a plurality of closed pores that do not extend through to the surface, and a solid made of carbon material. The distance between (002) planes of the solid portion is not less than 0.340 nm and not more than 0.410 nm. The plurality of closed pores account for a volume ratio of not less than 0% and not more than 10% with respect to a total volume of the plurality of open pores, the plurality of closed pores, and the solid portion. The plurality of open pores account for a volume ratio of not less than 0% and not more than 50% with respect to a total volume of the plurality of open pores, the plurality of closed pores, and the solid portion.
    Type: Application
    Filed: May 22, 2014
    Publication date: May 5, 2016
    Inventors: Akira KANO, Nobuhiko HOJO, Masahisa FUJIMOTO
  • Patent number: 9318740
    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 Lix1Nay1Co?Mn?O?, where 0.66<x1<1.1, 0<y1?0.02, 0.75??<1, 0<??0.25, and 1.9???2.1.
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: April 19, 2016
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Motoharu Saito, Masahisa Fujimoto
  • Publication number: 20160104889
    Abstract: A negative-electrode active material for a sodium-ion secondary battery contains a porous carbon material which has a plurality of open pores that extend through to the surface, a plurality of closed pores that do not extend through to the surface, and a solid portion made of carbon material. The distance between (002) planes of carbon in at least a part of the solid portion is 0.36 nm or more. The plurality of closed pores account for a volume ratio of not less than 30% and not more than 90% with respect to a total volume of the plurality of open pores, the plurality of closed pores, and the solid portion.
    Type: Application
    Filed: May 22, 2014
    Publication date: April 14, 2016
    Inventors: Akira KANO, Nobuhiko HOJO, Masahisa FUJIMOTO
  • Publication number: 20150333363
    Abstract: An object of the present invention or a problem to be solved by the present invention is to provide, as a material for use as a positive electrode of a sodium secondary battery, a novel material that allows the resulting battery to have capacity characteristics superior to those of conventional batteries. The composite metal oxide of the present invention has a composition represented by the general formula NaxMeyO2, where Me is at least one selected from the group consisting of Fe, Mn, and Ni, x satisfies 0.8<x?1.0, and y satisfies 0.95?y<1.05, and consists of a P2 structure. The sodium secondary battery of the present invention includes: a positive electrode (13) containing the composite metal oxide of the present invention; a negative electrode (16) containing a material capable of absorbing and desorbing Na ions; and an electrolyte containing Na ions and anions.
    Type: Application
    Filed: November 21, 2013
    Publication date: November 19, 2015
    Inventors: Nobuhiko HOJO, Ryuichi NATSUI, Akira KANO, Masahisa FUJIMOTO
  • Publication number: 20150180035
    Abstract: A method for producing a vitreous carbon material which can serve as a carbon material for a power storage device In the method, a polymer material, having six-membered ring structures in its basic carbon skeleton and having a nitrogen atom, is heated at a temperature of 1000° C. to 2100° C. under an inert gas environment, and then, the polymer material is pulverized, to thereby control graphitization and crystal growth of the carbon material, thus producing a vitreous carbon material which serves as a carbon material for a power storage device.
    Type: Application
    Filed: December 12, 2014
    Publication date: June 25, 2015
    Inventors: KIYOHIRO HINE, NAOMI NISHIKI, AKIRA KANO, MASAHISA FUJIMOTO
  • Publication number: 20150132666
    Abstract: There is provided a positive electrode for a nonaqueous electrolyte secondary battery, the positive electrode being capable of improving the charge-discharge cycle characteristics of the nonaqueous electrolyte secondary battery. A positive electrode 12 of a nonaqueous electrolyte secondary battery 1 contains positive electrode active material particles. The positive electrode active material particles contain a lithium-containing transition metal oxide. The lithium-containing transition metal oxide has a crystal structure that belongs to the space group P63mc. A compound of at least one selected from the group consisting of boron, zirconium, aluminum, magnesium, titanium, and a rare-earth element is attached to surfaces of the positive electrode active material particles.
    Type: Application
    Filed: December 28, 2012
    Publication date: May 14, 2015
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Atsushi Ogata, Takeshi Ogasawara, Yasufumi Takahashi, Motoharu Saito, Masaki Hirase, Katsunori Yanagida, Masahisa Fujimoto
  • Patent number: 8852799
    Abstract: An object of the invention is to provide an inexpensive non-aqueous electrolyte secondary battery that allows reversible charge and discharge to be carried out and can be used for a long period because of a stable non-aqueous electrolyte used therein. The invention provides a non-aqueous electrolyte secondary battery including a positive electrode including a positive electrode active material and capable of storing and releasing sodium, a negative electrode capable of storing and releasing sodium, and a non-aqueous electrolyte, and the positive electrode active material includes sodium, nickel, manganese, and a transition metal that can exist in a hexavalent state. An example of the transition metal that can exist in a hexavalent state may include tungsten (W). An example of the negative electrode may include a sodium metal capable of storing and releasing sodium ions.
    Type: Grant
    Filed: September 4, 2006
    Date of Patent: October 7, 2014
    Assignee: C/O Intellectual Property H.Q., Sanyo Electric Co., Ltd.
    Inventors: Masaharu Itaya, Hideyuki Koga, Kumiko Kanai, Takao Inoue, Masahisa Fujimoto