Patents by Inventor Yukihiro Oki

Yukihiro Oki 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).

  • Publication number: 20220344650
    Abstract: A nonaqueous electrolyte secondary battery according to the present invention is provided with a negative electrode, a positive electrode and a nonaqueous electrolyte. A negative electrode active material contained in the negative electrode contains a zinc manganese alloy containing Zn, Mn and Fe that is in an amount of 1,000 ppm or less of the total mass of Zn and Mn. With respect to the zinc manganese alloy, the molar ratio of the Zn content to the Mn content is from 3 to 13.
    Type: Application
    Filed: September 29, 2020
    Publication date: October 27, 2022
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yukihiro Oki, Masahisa Fujimoto
  • Publication number: 20220336799
    Abstract: A nonaqueous electrolyte secondary battery according to the present invention is provided with a negative electrode, a positive electrode and a nonaqueous electrolyte. A negative electrode active material contained in the negative electrode contains a zinc manganese alloy that is represented by general formula MnZnx (3?x?13).
    Type: Application
    Filed: September 29, 2020
    Publication date: October 20, 2022
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yukihiro Oki, Masahisa Fujimoto
  • Patent number: 11411274
    Abstract: An object of the present disclosure is to provide a high-endurance and long-life nonaqueous electrolyte secondary battery including a battery case having sealing performance unlikely to be degraded. A nonaqueous electrolyte secondary battery according to an aspect of the present disclosure includes a closed-end cylindrical outer can, a sealing body that closes an opening of the outer can, a resin gasket disposed between the outer can and the sealing body, a sealing member interposed between the outer can and the gasket, and a nonaqueous electrolyte. The sealing member has a multilayer structure including a first sealing member layer, the main constituent of which is one selected from butadiene rubber, urethane rubber, silicone rubber, chloroprene rubber, and isoprene rubber, and a second sealing member layer, the main constituent of which is one selected from ethylene propylene rubber, ethylene propylene diene rubber, and fluoro rubber.
    Type: Grant
    Filed: September 3, 2018
    Date of Patent: August 9, 2022
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Yukihiro Oki, Yoshiyuki Muraoka, Shuichi Yamashita
  • Publication number: 20210050588
    Abstract: A nonaqueous electrolyte secondary battery (10) in an example embodiment includes a positive electrode (11) having a lithium metal composite oxide, and a negative electrode (12) having graphite. The lithium metal composite oxide includes first composite oxide particles which are secondary particles formed by aggregation of primary particles having an average particle size of 50 nm to 5 ?m, and second composite oxide particles which are non-aggregated particles having an average particle size of 2 ?m to 20 ?m. The positive electrode (11) has lower initial charge/discharge efficiency than the initial charge/discharge efficiency of the negative electrode (12).
    Type: Application
    Filed: February 1, 2019
    Publication date: February 18, 2021
    Applicants: Panasonic Corporation, SANYO Electric Co., Ltd.
    Inventors: Yukihiro Oki, Shun Nomura, Atsushi Ogata
  • Publication number: 20200185669
    Abstract: An object of the present disclosure is to provide a high-endurance and long-life nonaqueous electrolyte secondary battery including a battery case having sealing performance unlikely to be degraded. A nonaqueous electrolyte secondary battery according to an aspect of the present disclosure includes a closed-end cylindrical outer can, a sealing body that closes an opening of the outer can, a resin gasket disposed between the outer can and the sealing body, a sealing member interposed between the outer can and the gasket, and a nonaqueous electrolyte. The sealing member has a multilayer structure including a first sealing member layer, the main constituent of which is one selected from butadiene rubber, urethane rubber, silicone rubber, chloroprene rubber, and isoprene rubber, and a second sealing member layer, the main constituent of which is one selected from ethylene propylene rubber, ethylene propylene diene rubber, and fluoro rubber.
    Type: Application
    Filed: September 3, 2018
    Publication date: June 11, 2020
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Yukihiro Oki, Yoshiyuki Muraoka, Shuichi Yamashita
  • Publication number: 20200076005
    Abstract: A nonaqueous electrolyte secondary battery according to an embodiment of the present disclosure includes: a wound electrode assembly formed by spirally winding, via a separator, a positive electrode and a negative electrode in which a negative electrode mixture layer is formed on a negative electrode core, where the negative electrode core is exposed on an outermost surface, and a fastening tape is attached to fix a winding end of the negative electrode to the outermost surface; and a package that houses the wound electrode assembly and a nonaqueous electrolyte. The winding end of the negative electrode extends from a winding edge of the positive electrode in a winding direction; a winding end of the separator extends from a winding edge of the negative electrode in the winding direction; and the fastening tape is attached to extend across the winding end of the separator.
    Type: Application
    Filed: November 22, 2017
    Publication date: March 5, 2020
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Yukihiro Oki, Takaki Nakao
  • Publication number: 20200067094
    Abstract: An object of the present disclosure is to improve the discharge capacity of a nonaqueous electrolyte secondary battery using a fluoroethylene carbonate during use at low temperature. An exemplary nonaqueous electrolyte secondary battery according to an embodiment includes a positive electrode including a positive electrode current collector and a positive electrode mixture layer formed on the positive electrode current collector, a negative electrode including a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector, and a nonaqueous electrolyte containing a fluoroethylene carbonate. The negative electrode current collector contains a copper alloy containing iron.
    Type: Application
    Filed: November 16, 2017
    Publication date: February 27, 2020
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Takaki Nakao, Yukihiro Oki
  • Patent number: 8597829
    Abstract: The nonaqueous electrolyte secondary battery includes a rolled electrode assembly 14E formed by rolling a positive electrode plate 11 and a negative electrode plate 12 with a separator 13 interposed therebetween, the separator 13 is fixed on the outermost periphery of the rolled electrode assembly 14E with an adhesive tape for fixing a roll end 30e, an exposed portion of a negative electrode substrate 12c without an active material mixture layer 12b is placed on an outermost periphery side of the negative electrode plate 12, a negative electrode tab 12a is connected to the negative electrode substrate 12c on an outermost periphery side, and the adhesive tape 30e is not overlapped with a roll end 11d of the positive electrode plate 11 and a roll end 12d of the negative electrode substrate 12c. Thus the battery is seldom broken even when charging and discharging are repeatedly provided at high voltage.
    Type: Grant
    Filed: February 9, 2010
    Date of Patent: December 3, 2013
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Atsushi Kaiduka, Masanori Ogi, Yukihiro Oki, Masato Iwanaga
  • Publication number: 20120231344
    Abstract: The present invention provides a nonaqueous electrolyte secondary battery that can be charged at high voltage and suppress capacity deterioration after charged storage in a high temperature environment. A nonaqueous electrolyte secondary battery 10 includes a positive electrode sheet 11, a negative electrode sheet 12, a nonaqueous electrolyte, and a separator 13, and the positive electrode active material has a potential of 4.35 to 4.60 V based on lithium. The positive electrode sheet 11 has a surface provided with an inorganic particle layer. The separator 13 has an average pore size of 0.15 ?m or more and 0.3 ?m or less. It is preferable that the inorganic particle layer provided to the surface of the positive electrode sheet 11 contain titanium oxide or aluminum oxide.
    Type: Application
    Filed: November 29, 2010
    Publication date: September 13, 2012
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Koji Okushi, Yukihiro Oki, Masato Iwanaga
  • Patent number: 8026000
    Abstract: A nonaqueous electrolyte secondary battery of the invention has a positive electrode having a positive electrode active material, a negative electrode, and a nonaqueous electrolyte having electrolyte salt in a nonaqueous solvent. The electric potential of the positive electrode active material is 4.4 to 4.6 V relative to lithium, and the nonaqueous electrolyte contains a compound expressed by structural formula (I) below. The quantity of compound added is preferably 0.1% to 2% by mass. Also, the positive electrode active material preferably comprises a mixture of a lithium-cobalt composite oxide which is LiCoO2 containing at least both zirconium and magnesium and a lithium-manganese-nickel composite oxide that has a layer structure and contains at least both manganese and nickel. Thanks to such structure, a nonaqueous electrolyte secondary battery can be provided that is charged to charging termination potential of 4.4 to 4.6 V relative to lithium and that has enhanced overcharging safety.
    Type: Grant
    Filed: January 23, 2007
    Date of Patent: September 27, 2011
    Assignees: Sanyo Electric Co., Ltd., UBE Industries, Ltd.
    Inventors: Masato Iwanaga, Yukihiro Oki, Koji Abe, Kazuhiro Miyoshi
  • Patent number: 8021787
    Abstract: The preservation performance of a nonaqueous electrolyte secondary cell charged to high potential is improved while the initial capacity and the cycle property of the cell are also improved. The nonaqueous electrolyte secondary cell includes: a positive electrode having lithium phosphate and a positive electrode active material containing lithium cobalt compound oxide and lithium manganese nickel compound oxide having a layer structure, the lithium cobalt compound oxide having at least zirconium and magnesium added in LiCoO2; a negative electrode having a negative electrode active material; and a nonaqueous electrolyte having a nonaqueous solvent and an electrolytic salt. The potential of the positive electrode is more than 4.3 V and 5.1 V or less based on lithium. The nonaqueous electrolyte contains vinylene carbonate as the nonaqueous solvent and, as the electrolytic salt, at least one of lithium bis(pentafluoroethane sulfonyl)imide and lithium bis(trifluoromethane sulfonyl)imide at 0.1 M or more and 0.
    Type: Grant
    Filed: May 30, 2007
    Date of Patent: September 20, 2011
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Masato Iwanaga, Kentaro Takahashi, Yukihiro Oki, Yoshihiko Ikeda, Akira Kinoshita, Nobumichi Nishida
  • Patent number: 8021786
    Abstract: A non-aqueous electrolyte secondary cell superior in resistance against continuous charging at high potential is provided. The non-aqueous electrolyte secondary cell includes: a positive electrode having lithium phosphate and a positive electrode active material comprising lithium cobalt oxide containing at least one selected from Mg, Al, Ti, and Zr; and a separator having pores having an average diameter of 0.05 to 0.2 ?m.
    Type: Grant
    Filed: March 31, 2008
    Date of Patent: September 20, 2011
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Atsushi Kaiduka, Masato Iwanaga, Yukihiro Oki
  • Publication number: 20100233525
    Abstract: The nonaqueous electrolyte secondary battery includes a rolled electrode assembly 14E formed by rolling a positive electrode plate 11 and a negative electrode plate 12 with a separator 13 interposed therebetween, the separator 13 is fixed on the outermost periphery of the rolled electrode assembly 14E with an adhesive tape for fixing a roll end 30e, an exposed portion of a negative electrode substrate 12c without an active material mixture layer 12b is placed on an outermost periphery side of the negative electrode plate 12, a negative electrode tab 12a is connected to the negative electrode substrate 12c on an outermost periphery side, and the adhesive tape 30e is not overlapped with a roll end 11d of the positive electrode plate 11 and a roll end 12d of the negative electrode substrate 12c. Thus the battery is seldom broken even when charging and discharging are repeatedly provided at high voltage.
    Type: Application
    Filed: February 9, 2010
    Publication date: September 16, 2010
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Atsushi Kaiduka, Masanori Ogi, Yukihiro Oki, Masato Iwanaga
  • Publication number: 20090181311
    Abstract: The preservation performance of a nonaqueous electrolyte secondary cell charged to high potential is improved while the initial capacity and the cycle property of the cell are also improved. The nonaqueous electrolyte secondary cell includes: a positive electrode having lithium phosphate and a positive electrode active material containing lithium cobalt compound oxide and lithium manganese nickel compound oxide having a layer structure, the lithium cobalt compound oxide having at least zirconium and magnesium added in LiCoO2; a negative electrode having a negative electrode active material; and a nonaqueous electrolyte having a nonaqueous solvent and an electrolytic salt. The potential of the positive electrode is more than 4.3 V and 5.1 V or less based on lithium. The nonaqueous electrolyte contains vinylene carbonate as the nonaqueous solvent and, as the electrolytic salt, at least one of lithium bis(pentafluoroethane sulfonyl)imide and lithium bis(trifluoromethane sulfonyl)imide at 0.1 M or more and 0.
    Type: Application
    Filed: May 30, 2007
    Publication date: July 16, 2009
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Masato Iwanaga, Kentaro Takahashi, Yukihiro Oki, Yoshihiko Ikeda, Akira Kinoshita, Nobumichi Nishida
  • Publication number: 20080241694
    Abstract: A non-aqueous electrolyte secondary cell superior in resistance against continuous charging at high potential is provided. The non-aqueous electrolyte secondary cell includes: a positive electrode having lithium phosphate and a positive electrode active material comprising lithium cobalt oxide containing at least one selected from Mg, Al, Ti, and Zr; and a separator having pores having an average diameter of 0.05 to 0.2 ?m.
    Type: Application
    Filed: March 31, 2008
    Publication date: October 2, 2008
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Atsushi Kaiduka, Masato Iwanaga, Yukihiro Oki
  • Publication number: 20070172730
    Abstract: A nonaqueous electrolyte secondary battery of the invention has a positive electrode having a positive electrode active material, a negative electrode, and a nonaqueous electrolyte having electrolyte salt in a nonaqueous solvent. The electric potential of the positive electrode active material is 4.4 to 4.6 V relative to lithium, and the nonaqueous electrolyte contains a compound expressed by structural formula (I) below. The quantity of compound added is preferably 0.1% to 2% by mass. Also, the positive electrode active material preferably comprises a mixture of a lithium-cobalt composite oxide which is LiCoO2 containing at least both zirconium and magnesium and a lithium-manganese-nickel composite oxide that has a layer structure and contains at least both manganese and nickel. Thanks to such structure, a nonaqueous electrolyte secondary battery can be provided that is charged to charging termination potential of 4.4 to 4.6 V relative to lithium and that has enhanced overcharging safety.
    Type: Application
    Filed: January 23, 2007
    Publication date: July 26, 2007
    Applicants: SANYO ELECTRIC CO., LTD., UBE INDUSTRIES LTD.
    Inventors: Masato Iwanaga, Yukihiro Oki, Koji Abe, Kazuhiro Miyoshi