Patents by Inventor MAYUMI MAENISHI

MAYUMI MAENISHI 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: 10497967
    Abstract: A negative-electrode active material comprises a graphite including boron and nitrogen. A ratio R1 satisfies 0.5?R1?1, where R1=SBN/SB, and SB denotes a total peak area of a boron 1s spectrum of the graphite obtained by X-ray photoelectron spectroscopy, and SBN denotes a peak area of a spectrum assigned to boron bonded to nitrogen in the boron 1s spectrum. A ratio R2 satisfies 0<R2?0.05, where R2=SB/(SB+SC+SN), and SC denotes a peak area of a carbon 1s spectrum of the graphite obtained by X-ray photoelectron spectroscopy, and SN denotes a peak area of a nitrogen 1s spectrum of the graphite obtained by X-ray photoelectron spectroscopy.
    Type: Grant
    Filed: April 23, 2018
    Date of Patent: December 3, 2019
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Tetsuyuki Okano, Takayuki Nakatsutsumi, Mayumi Maenishi, Masahiro Takahata, Junko Matsushita, Akira Kano, Nobuhiko Hojo
  • Patent number: 10153512
    Abstract: An electrolyte solution contains a non-aqueous solvent and an alkali metal salt dissolved in the non-aqueous solvent. The non-aqueous solvent contains a linear carboxylate represented by the following formula: where R1 and R2 independently represent an aromatic group, an unsaturated aliphatic group, or a saturated aliphatic group. A battery includes the electrolyte solution, a positive electrode containing a positive electrode active material that has a property of occluding and releasing an alkali metal ion, and a negative electrode containing an alkali metal or a negative electrode active material that has a property of occluding and releasing the alkali metal ion.
    Type: Grant
    Filed: May 18, 2016
    Date of Patent: December 11, 2018
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Takayuki Nakatsutsumi, Mayumi Maenishi, Nobuhiko Hojo
  • Publication number: 20180337399
    Abstract: A negative electrode active material for a nonaqueous secondary battery includes graphite containing boron. The graphite has an average discharge potential of 0.16 V or more and 0.2 V or less, based on Li. A nonaqueous secondary battery includes: a positive electrode including a positive electrode active material capable of occluding and releasing an alkali metal ion; a negative electrode including a negative electrode active material above; and a nonaqueous electrolyte solution.
    Type: Application
    Filed: May 8, 2018
    Publication date: November 22, 2018
    Inventors: NOBUHIKO HOJO, TAKAYUKI NAKATSUTSUMI, TETSUYUKI OKANO, MAYUMI MAENISHI, MASAHIRO TAKAHATA
  • Publication number: 20180337398
    Abstract: A negative electrode active material for a nonaqueous secondary battery includes graphite containing boron. The graphite has a crystallite size Lc of 100 nm or more in the c-axis direction, In a Raman spectrum obtained by Raman spectroscopy of a surface of the graphite, a ratio R is 0.4 or more, the ratio R being a ratio of a maximum peak value Id of Raman intensity of a D band appearing in a Raman shift range of 1300 cm?1 or more and 1400 cm?1 or less to a maximum peak value Ig of Raman intensity of a G band appearing in a Raman shift range of 1500 cm?1 or more and 1650 cm?1 or less.
    Type: Application
    Filed: May 8, 2018
    Publication date: November 22, 2018
    Inventors: MAYUMI MAENISHI, TAKAYUKI NAKATSUTSUMI, TETSUYUKI OKANO, NOBUHIKO HOJO
  • Publication number: 20180337423
    Abstract: A negative-electrode active material comprises a graphite including boron and nitrogen. A ratio R1 satisfies 0.5?R1?1, where R1=SBN/SB, and SB denotes a total peak area of a boron 1s spectrum of the graphite obtained by X-ray photoelectron spectroscopy, and SBN denotes a peak area of a spectrum assigned to boron bonded to nitrogen in the boron 1s spectrum. A ratio R2 satisfies 0<R2?0.05, where R2=SB/(SB+SC+SN), and SC denotes a peak area of a carbon 1s spectrum of the graphite obtained by X-ray photoelectron spectroscopy, and SN denotes a peak area of a nitrogen 1s spectrum of the graphite obtained by X-ray photoelectron spectroscopy.
    Type: Application
    Filed: April 23, 2018
    Publication date: November 22, 2018
    Inventors: TETSUYUKI OKANO, TAKAYUKI NAKATSUTSUMI, MAYUMI MAENISHI, MASAHIRO TAKAHATA, JUNKO MATSUSHITA, AKIRA KANO, NOBUHIKO HOJO
  • Patent number: 9929431
    Abstract: An electrolyte solution contains a non-aqueous solvent and an alkali metal salt dissolved in the non-aqueous solvent. The non-aqueous solvent contains cyclopropanecarbonitrile. A battery includes an electrolyte solution which contains a non-aqueous solvent containing cyclopropanecarbonitrile and an alkali metal salt dissolved in the non-aqueous solvent, a positive electrode containing a positive electrode active material that has a property of occluding and releasing an alkali metal ion, and a negative electrode containing an alkali metal or a negative electrode active material that has a property of occluding and releasing the alkali metal ion.
    Type: Grant
    Filed: May 19, 2016
    Date of Patent: March 27, 2018
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Takayuki Nakatsutsumi, Mayumi Maenishi, Nobuhiko Hojo
  • Publication number: 20160351955
    Abstract: An electrolyte solution contains a non-aqueous solvent and an alkali metal salt dissolved in the non-aqueous solvent. The non-aqueous solvent contains a linear carboxylate represented by the following formula: where R1 and R2 independently represent an aromatic group, an unsaturated aliphatic group, or a saturated aliphatic group. A battery includes the electrolyte solution, a positive electrode containing a positive electrode active material that has a property of occluding and releasing an alkali metal ion, and a negative electrode containing an alkali metal or a negative electrode active material that has a property of occluding and releasing the alkali metal ion.
    Type: Application
    Filed: May 18, 2016
    Publication date: December 1, 2016
    Inventors: TAKAYUKI NAKATSUTSUMI, MAYUMI MAENISHI, NOBUHIKO HOJO
  • Publication number: 20160351960
    Abstract: An electrolyte solution contains a non-aqueous solvent and an alkali metal salt dissolved in the non-aqueous solvent. The non-aqueous solvent contains cyclopropanecarbonitrile. A battery includes an electrolyte solution which contains a non-aqueous solvent containing cyclopropanecarbonitrile and an alkali metal salt dissolved in the non-aqueous solvent, a positive electrode containing a positive electrode active material that has a property of occluding and releasing an alkali metal ion, and a negative electrode containing an alkali metal or a negative electrode active material that has a property of occluding and releasing the alkali metal ion.
    Type: Application
    Filed: May 19, 2016
    Publication date: December 1, 2016
    Inventors: TAKAYUKI NAKATSUTSUMI, MAYUMI MAENISHI, NOBUHIKO HOJO