Patents by Inventor Noboru Yoshida

Noboru Yoshida 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: 10978737
    Abstract: The present invention relates to an electrolyte solution comprising a supporting salt, a nonaqueous solvent containing a compound having a viscosity of 1.0 mPa-s or less in an amount of more than 50% by volume in the nonaqueous solvent, and a halogenated cyclic acid anhydride. According to the present invention, an electrolyte solution capable of suppressing gas generation is provided.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: April 13, 2021
    Assignee: NEC Corporation
    Inventors: Noboru Yoshida, Ikiko Shimanuki, Shinsaku Saitho, Hitoshi Ishikawa
  • Publication number: 20210036330
    Abstract: One of the objects of the present invention is to provide an electrode having an active material layer and an insulating layer formed on a current collector in which the insulating layer has sufficient adhesion and which can be manufactured without significantly changing the manufacturing process. The electrode comprises a current collector 110, an active material layer 111 formed on at least one surface of the current collector 110, and an insulating layer 112 formed on the surface of the active material layer 111. The active material layer 111 includes an active material and a first binder. The insulating layer 112 includes non-conductive particles and a second binder. An interfacial binder ratio, which is a ratio of amount of a binder existing in an interface region between the active material layer 111 and the insulating layer 112 per unit thickness of the interface region to amount of a binder existing in the active material layer 111 per unit thickness of the active material layer 111, is 85% or more.
    Type: Application
    Filed: February 7, 2019
    Publication date: February 4, 2021
    Applicant: NEC CORPORATION
    Inventors: Noboru YOSHIDA, Makihiro OTOHATA
  • Patent number: 10910635
    Abstract: A secondary battery electrode manufacturing method comprises applying a slurry for a first layer to a current collector, applying a slurry for a second layer to the slurry for the first layer before the slurry for the first layer dries, and drying the slurries to obtain a laminated structure in which the first and second layers are laminated in this order on the current collector. A first and second binder or thickener for the respective slurries are selected such that when viscosities are measured for a first solution including solvent and the first binder or thickener dissolved in the solvent in a specific mass ratio and a second solution including a solvent and the second binder or thickener dissolved in the solvent at the same mass ratio under the same conditions, the viscosity of the first solution is higher than the viscosity of the second solution.
    Type: Grant
    Filed: November 13, 2018
    Date of Patent: February 2, 2021
    Assignee: NEC CORPORATION
    Inventors: Makihiro Otohata, Noboru Yoshida
  • Publication number: 20200381698
    Abstract: A method for manufacturing an electrode for a secondary battery includes: applying a first layer slurry containing a first binder to a surface of a current collector, applying a second layer slurry containing a second binder on the first layer slurry before the first layer slurry is dried, and drying the first layer slurry and the second layer slurry after applying the first layer slurry and the second layer slurry to obtain a laminated structure in which a first layer and a second layer are laminated in this order on the current collector. The second layer slurry has a solid content ratio of more than 50% by mass and a composition ratio of the second binder of more than 2% by mass.
    Type: Application
    Filed: November 13, 2018
    Publication date: December 3, 2020
    Applicant: NEC CORPORATION
    Inventors: Noboru YOSHIDA, Makihiro OTOHATA
  • Patent number: 10840551
    Abstract: The present invention relates to a lithium secondary battery having a positive electrode comprising a positive electrode active material capable of absorbing and releasing lithium ions, a negative electrode comprising a negative electrode active material capable of absorbing and releasing lithium ions, and an electrolyte solution, wherein a positive electrode surface detection component comprises at least one negative secondary ion peak selected from CH3S2O6? and CHS2O4?, and further comprises a negative secondary ion peak of SO3—, wherein the positive electrode surface detection component is detected when a primary ion is irradiated on the surface of the positive electrode active material by a Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS) method. According to the present invention, it is possible to provide a lithium secondary battery having excellent cycle characteristics.
    Type: Grant
    Filed: August 4, 2015
    Date of Patent: November 17, 2020
    Assignee: NEC Corporation
    Inventors: Ikiko Shimanuki, Hitoshi Ishikawa, Noboru Yoshida, Daisuke Kawasaki
  • Publication number: 20200303743
    Abstract: Provided is an electrode for a battery which effectively suppress a short circuit between a positive electrode and a negative electrode at high temperature of the battery. The electrode includes a current collector 110, an active material layer 111 formed on at least one side of the current collector 110 and an insulating layer 112 formed on the surface of the active material layer 111. The electrode was formed so that peeling occurs between the current collector 110 and the active material layer 111 and the peeling strength was 10 mN/mm or more when a 90° peeling test was performed at a peeling rate of 100/min.
    Type: Application
    Filed: May 18, 2017
    Publication date: September 24, 2020
    Applicant: NEC Corporation
    Inventors: Noboru YOSHIDA, Makihiro OTOHATA, Shinya SUDO
  • Patent number: 10777795
    Abstract: The separator for secondary battery, comprising: a porous substrate having a melting temperature or a decomposition temperature of 200° C. or more; and a resin member formed at least inside of the substrate in a plane section that occupies at least a part of a plane along with a thickness direction of the substrate; wherein said resin member is coated on inner surfaces of pores without completely blocking connecting paths that connects pores of the porous member, and wherein a distribution density of the resin member becomes lower toward inside of the substrate.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: September 15, 2020
    Assignee: NEC Corporation
    Inventors: Kenichi Shimura, Noboru Yoshida, Kazuhiko Inoue
  • Patent number: 10741879
    Abstract: Provided is a secondary battery which uses a heat generating reaction of the redox shuttle agent to achieve stopping a function of the battery by blocking ion conduction and rapidly increasing an internal resistance by means of volatilized non-aqueous solvent when an abnormality such as overcharge occurs. A secondary battery 1 comprises a battery element comprising a positive electrode 11, a negative electrode 12, a separator 13, and an electrolytic solution, and a casing sealing the battery element. The electrolytic solution comprises a redox shuttle agent and an organic solvent having a boiling point of 125° C. or less. The separator 13 comprises aramid fiber assembly, aramid microporous structure, polyimide microporous structure or polyphenylenesulfide microporous structure, and polyphenylenesulfide, and has an average void size of 0.1 ?m or more.
    Type: Grant
    Filed: October 19, 2015
    Date of Patent: August 11, 2020
    Assignee: NEC Corporation
    Inventors: Kazuhiko Inoue, Kenichi Shimura, Noboru Yoshida
  • Publication number: 20200220119
    Abstract: A battery having a battery element with an outer package made of a film that includes a first portion having a first bottom wall and a first side wall rising from an outer peripheral end of the first bottom wall over an entire outer peripheral end of the first bottom wall, a second portion having a second bottom wall and a second sidewall rising from an outer peripheral end at least at a part of the outer peripheral end of the second bottom surface, and a joining portion in which outer peripheral portions of the first and second portions are joined when the battery element is between the first and second bottom walls and the first and second portions face each other, wherein the joining portion includes a sidewall joining portion in which the first and second sidewalls are joined and located outside a thickness range of the battery element.
    Type: Application
    Filed: September 27, 2018
    Publication date: July 9, 2020
    Applicant: NEC CORPORATION
    Inventors: Noboru YOSHIDA, Kazuhiko INOUE, Kenichi SHIMURA, Makihiro OTOHATA
  • Publication number: 20200153044
    Abstract: A purpose of the present invention is to provide a lithium ion secondary battery in which an increase in internal resistance is suppressed and a halogenated cyclic anhydride is used as an electrolyte additive. The lithium ion secondary battery according to the present invention comprises a positive electrode and an electrolyte solution, wherein a porous layer comprising an insulating filler is formed on the positive electrode, and the electrolyte solution comprises 0.005 to 10 weight % of a halogenated cyclic acid anhydride.
    Type: Application
    Filed: April 24, 2018
    Publication date: May 14, 2020
    Applicant: NEC Corporation
    Inventors: Makihiro OTOHATA, Noboru YOSHIDA
  • Patent number: 10644347
    Abstract: A negative electrode active material constituting a lithium ion secondary battery having high energy density and excellent cycle characteristics, and a negative electrode and a lithium ion secondary battery comprising the same are provided. The present invention relates to a negative electrode active material comprising graphite particles and crystalline silicon particles, wherein a median diameter of the crystalline silicon particles is 0.7 ?m or less, and a weight ratio of the crystalline silicon particles to the total weight of the graphite particles and the crystalline silicon particles is 1 wt % or more and 25 wt % or less.
    Type: Grant
    Filed: February 22, 2017
    Date of Patent: May 5, 2020
    Assignee: NEC Corporation
    Inventors: Daisuke Kawasaki, Takashi Ohtsuka, Suguru Tamai, Noboru Yoshida, Shinya Sudo
  • Publication number: 20200058930
    Abstract: One of the objects of the present invention is to suppress mixing of a first layer and a second layer while forming the second layer before drying the first layer when manufacturing the electrode for the secondary battery in which the first layer and the second layer are laminated on the current collector. A method for manufacturing an electrode used as a positive electrode and a negative electrode of a secondary battery according to the present invention comprises applying a first layer slurry to a surface of a current collector, applying a second layer slurry on the first layer slurry before the first layer slurry is dried, and drying the first layer slurry and the second layer slurry after applying the first layer slurry and the second layer slurry to obtain a laminated structure in which a first layer and a second layer are laminated in this order on the current collector.
    Type: Application
    Filed: February 8, 2018
    Publication date: February 20, 2020
    Applicant: NEC Corporation
    Inventors: Makihiro OTOHATA, Noboru YOSHIDA
  • Patent number: 10566661
    Abstract: The present invention relates to an electrolytic solution comprising a cyclic disulfonic acid ester represented by the specific formula and a cyclic dicarboxylic acid ester represented by the specific formula, and the secondary battery using the same. According to the present invention, the electrolytic solution which can improve a cycle characteristics in a secondary battery and a secondary battery using the same can be provided.
    Type: Grant
    Filed: June 16, 2015
    Date of Patent: February 18, 2020
    Assignee: NEC Corporation
    Inventors: Ikiko Shimanuki, Hitoshi Ishikawa, Noboru Yoshida
  • Publication number: 20200028199
    Abstract: One of the objects of the present invention is to suppress a short circuit due to metal deposition in an insulating layer in a secondary battery in which a positive electrode and a negative electrode are disposed to face each other via the insulating layer. The secondary battery comprises a battery element including at least one positive electrode 11 and at least one negative electrode 12, and a casing that seals the battery element together with an electrolyte. At least one of the positive electrode 11 and the negative electrode 12 comprises a current collector, an active material layer formed on at least one surface of the current collector, and an insulating layer 112 formed on the surface of the active material layer. The electrolyte comprises an electrolyte component and a crosslinked gelling agent.
    Type: Application
    Filed: February 8, 2018
    Publication date: January 23, 2020
    Applicant: NEC Corporation
    Inventors: Noboru YOSHIDA, Kazuhiko INOUE
  • Publication number: 20190393465
    Abstract: A purpose of one embodiment of the present invention is to provide a highly safe lithium ion secondary battery comprising a layered lithium nickel composite oxide with high nickel content and a polyethylene terephthalate separator. The first lithium ion secondary battery of the present invention is characterized by comprising a positive electrode comprising a positive electrode mixture layer and an insulation layer, and a separator comprising polyethylene terephthalate, wherein the positive electrode mixture layer comprises a layered lithium nickel composite oxide having a nickel ratio of 60 mol % or more based on metals other than lithium.
    Type: Application
    Filed: January 25, 2018
    Publication date: December 26, 2019
    Applicant: NEC CORPORATION
    Inventors: Noboru YOSHIDA, Kazuhiko INOUE, Kenichi SHIMURA
  • Publication number: 20190348665
    Abstract: Disclosed is an electrode, comprising: a metal foil; an electrode layer formed on at least one surface of the metal foil; and an insulating layer formed on the electrode layer; wherein boundary portion between the insulating layer and the electrode layer is in a state in which a part of the insulating layer engages into a part of the electrode layer, and Ls/L is 1.25 or more, wherein a reference length of a straight line in a direction in which the metal foil extends is taken as L and a boundary length along boundary between the insulating layer and the electrode layer is taken as Ls.
    Type: Application
    Filed: September 27, 2017
    Publication date: November 14, 2019
    Applicant: NEC CORPORATION
    Inventors: Shinya SUDO, Kazuhiko INOUE, Noboru YOSHIDA, Makihiro OTOHATA
  • Publication number: 20190252716
    Abstract: The purpose of one embodiment of the present invention is to provide a lithium ion secondary battery which has improved cycle characteristics and the negative electrode of which comprises a silicon oxide. The present invention relates to a lithium ion secondary battery comprising a silicon oxide and an electrolyte solution comprising a fluorinated acid anhydride.
    Type: Application
    Filed: September 14, 2017
    Publication date: August 15, 2019
    Applicant: NEC Corporation
    Inventors: Suguru TAMAI, Noboru YOSHIDA
  • Patent number: 10361464
    Abstract: The present invention relates to an electrolytic solution comprising a cyclic dicarboxylic acid ester represented by the specific formula, and the secondary battery comprising the same. According to the present invention, the electrolytic solution comprising an additive which can improve a characteristics in a secondary battery and a secondary battery comprising the same can be provided.
    Type: Grant
    Filed: June 16, 2015
    Date of Patent: July 23, 2019
    Assignee: NEC Corporation
    Inventors: Noboru Yoshida, Ikiko Shimanuki, Shinsaku Saitho, Hitoshi Ishikawa
  • Patent number: 10333174
    Abstract: The present invention relates to a lithium ion secondary battery comprising a positive electrode having a coating amount per unit area of 50 mg/cm2 or more and an electrode density of 3.3 g/cc or more and a negative electrode having a coating amount per unit area of 24 mg/cm2 or more and an electrode density of 1.5 g/cc or more, a separator having a shrinking ratio of 2% or less by heat treatment at 80° C. for 6 hours, and an electrolyte solution comprising at least one sulfonic acid ester compound, and a ratio of a sulfur content in the central portion (As) and a sulfur content in the edge portion (Bs) of the positive electrode and the negative electrode, in each, is 0.7?As/Bs?1.1.
    Type: Grant
    Filed: March 22, 2016
    Date of Patent: June 25, 2019
    Assignee: NEC Corporation
    Inventors: Daisuke Kawasaki, Kenichi Shimura, Noboru Yoshida, Kazuhiko Inoue, Jiro Iriyama
  • Publication number: 20190167484
    Abstract: An adhesive skin patch including a base film, a pressure-sensitive adhesive layer provided on one side of the base film, and a release liner peelably laminated so as to cover an adhesive surface of the pressure-sensitive adhesive layer, wherein the pressure-sensitive adhesive layer contains an acrylic copolymer, and wherein the base film has a thickness of 1 to 9 mm, and the pressure-sensitive adhesive layer has a thickness of 16 to 50 mm, the adhesive skin patch having good adhesiveness to a skin surface and a good fit feeling as if no skin patch is adhered; and a wound body of an adhesive skin patch obtained by winding the adhesive skin patch.
    Type: Application
    Filed: August 9, 2017
    Publication date: June 6, 2019
    Applicant: NITTO DENKO CORPORATION
    Inventors: Takeshi SAKUMA, Mai SUZUKI, Tetsuya NAKAMURA, Noboru YOSHIDA