Patents by Inventor Katsumi Maeda

Katsumi Maeda 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: 11136641
    Abstract: High-strength galvannealed steel sheet including any of a) an oxide containing Fe and Mn, b) an oxide containing Fe and Mn and an Fe oxide, c) an oxide containing Fe and Mn and a Mn oxide, d) an oxide containing Fe and Mn, an Fe oxide, and a Mn oxide, and e) an Fe oxide and a Mn oxide is present in a zinc coated layer. The total amount of oxide is 0.01 to 0.100 g/m2; the ratio by mass % of Mn to Fe, e.g., Mn/Fe, contained in the oxide is 0.10 to 10.00; an oxide of at least one selected from Fe and Mn is present in an amount of 60% or more; and an oxide of at least one selected from Fe and Mn is present in a surface layer portion of a steel sheet in an amount of 0.040 g/m2 or less (not including zero).
    Type: Grant
    Filed: December 8, 2016
    Date of Patent: October 5, 2021
    Assignee: JFE STEEL CORPORATION
    Inventors: Satoshi Maeda, Yoichi Makimizu, Yoshitsugu Suzuki, Katsumi Yamada, Yoshiyasu Kawasaki
  • Patent number: 11131888
    Abstract: In a display panel, all of a plurality of directors of liquid crystal composition composing the liquid crystal layer are essentially perpendicular to the first alignment film and the second alignment film in the absence of applied voltage. A liquid crystal layer included in each of a plurality of unit pixels arranged in a matrix along a row direction and along a column direction has a single alignment state. A director of liquid crystal composition located at a central portion in a first unit pixel that is one of the plurality of unit pixels is in an opposite orientation with respect to a director of liquid crystal composition located at a central portion in a second unit pixel that is in a same row or a same column as the first unit pixel.
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: September 28, 2021
    Assignee: SAKAI DISPLAY PRODUCTS CORPORATION
    Inventors: Atsuko Maeda, Shintaro Yamada, Katsumi Kondo, Hideki Nakagawa, Toshihiro Yamashita
  • Publication number: 20210230002
    Abstract: An object of the present invention is to provide a reduced graphene-based material to improve charge/discharge efficiency of a lithium ion secondary battery. The reduced graphene-based material of the present invention has a coating containing lithium element (Li), phosphorus element (P), fluorine element (F), and oxygen element (O) on at least a part of the surface, wherein in the elemental composition of the surface as measured by X-ray photoelectron spectroscopy (XPS), the proportion of lithium element (Li) is 0.8 to 2.0 (atomic %), the proportion of phosphorus element (P) is 0.5 to 2.0 (atomic %), the proportion of fluorine element (F) is 0.05 to 1.0 (atomic %), and the proportion of oxygen element (O) is 7.0 to 12.0 (atomic %).
    Type: Application
    Filed: June 4, 2019
    Publication date: July 29, 2021
    Applicant: NEC CORPORATION
    Inventor: Katsumi MAEDA
  • Patent number: 10991940
    Abstract: A graphite-based material for a lithium ion secondary battery, the graphite-based material comprising a coating film on at least a part of the surface of a graphite particle, the coating film comprising a lithium fluorophosphate compound having a specific composition.
    Type: Grant
    Filed: October 5, 2017
    Date of Patent: April 27, 2021
    Assignee: NEC CORPORATION
    Inventor: Katsumi Maeda
  • Patent number: 10944111
    Abstract: An electrode for lithium ion secondary batteries, including a porous glass particle and a positive electrode active material or negative electrode active material that is capable of occluding and releasing lithium ions wherein the pore volume of the porous glass particle is from 0.1 ml/g to 2 ml/g, is used to provide a lithium ion secondary battery excellent in a charge rate property.
    Type: Grant
    Filed: October 25, 2017
    Date of Patent: March 9, 2021
    Assignee: NEC CORPORATION
    Inventors: Katsumi Maeda, Noriyuki Tamura, Mika Shiba
  • Patent number: 10897062
    Abstract: In order to provide a lithium ion secondary battery having both high energy density and an excellent charging-rate characteristic, in the lithium ion secondary battery comprising a positive electrode, a negative electrode and an electrolyte solution, the electrolyte solution comprises 0.5 mol/l or more of Li[(FSO2)2N], 0.5 mol/l or more of LiPF6, and LiPO2F2; and the negative electrode comprises graphite deposited with amorphous carbon or graphite coated with amorphous carbon and having a specific surface area of 4 m2/g or less, as a negative electrode active material.
    Type: Grant
    Filed: June 13, 2017
    Date of Patent: January 19, 2021
    Assignee: NEC Corporation
    Inventors: Noriyuki Tamura, Katsumi Maeda, Qian Cheng
  • Patent number: 10833369
    Abstract: An object of the present invention is to provide a positive electrode active substance capable of suppressing gas generation associated with charge and discharge in a lithium secondary battery, and capable of suppressing gas generation associated with charge and discharge particularly even in cases where the use voltage of the lithium secondary battery is high, a positive electrode and a lithium secondary battery using the positive electrode active substance, and methods for producing these. The present invention is a positive electrode active substance for a lithium secondary battery, comprising a coated positive electrode active substance wherein a surface of a positive electrode active substance is directly coated with lithium metaphosphate.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: November 10, 2020
    Assignee: NEC CORPORATION
    Inventors: Katsumi Maeda, Sadanori Hattori
  • Publication number: 20200203767
    Abstract: The invention provides a lithium ion battery, including an anode, a cathode and an electrolytic solution including imide anion based lithium salt and LiPO2F2. The cathode includes a cathode active material particle and a carbon conductive additive forming an island-bridge structure on the surface of the cathode active material particle. The carbon conductive additive includes graphenes partially covered with the surface of the cathode active material particle to form an island structure, carbon blacks attached on the surface of the graphene and carbon nanotubes connecting between graphenes as a bridge structure.
    Type: Application
    Filed: July 20, 2017
    Publication date: June 25, 2020
    Applicant: NEC CORPORATION
    Inventors: Qian CHENG, Katsumi MAEDA, Noriyki TAMURA, Mika SHIBA
  • Patent number: 10622678
    Abstract: In terms of a lithium ion secondary battery using, in a positive electrode, a lithium transition metal composite oxide containing an over-stoichiometric amount of lithium, a lithium ion secondary battery in which an amount of a gas generated during charge/discharge cycles is reduced and capacity retention is improved is provided. The lithium ion secondary battery includes a positive electrode containing a lithium transition metal composite oxide containing Fe and containing an over-stoichiometric amount of lithium, and a nonaqueous electrolyte solution, and the nonaqueous electrolyte solution contains a nonaqueous organic solvent, an electrolyte, and lithium difluorophosphate.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: April 14, 2020
    Assignee: NEC CORPORATION
    Inventors: Katsumi Maeda, Noriyuki Tamura, Sadanori Hattori
  • Publication number: 20200058932
    Abstract: A graphite-based material for a lithium ion secondary battery, the graphite-based material comprising a coating film on at least a part of the surface of a graphite particle, the coating film comprising a lithium fluorophosphate compound having a specific composition.
    Type: Application
    Filed: October 5, 2017
    Publication date: February 20, 2020
    Applicant: NEC CORPORATION
    Inventor: Katsumi MAEDA
  • Patent number: 10497978
    Abstract: A secondary battery exhibiting high charge and discharge rate characteristics can be provided, by making the secondary battery have a cathode including a nitroxyl compound taking a nitroxyl cation substructure represented by the following formula (1) in an oxidized state and a nitroxyl radical substructure represented by the following formula (2) in a reduced state, an anode including an active material capable of reversibly intercalating and deintercalating a lithium ion, and an electrolyte solution including a lithium salt and an aprotic organic solvent, and employing Li[(FSO2)2N] as the lithium salt:
    Type: Grant
    Filed: February 23, 2016
    Date of Patent: December 3, 2019
    Assignee: NEC Corporation
    Inventors: Terumasa Shimoyama, Takanori Nishi, Shigeyuki Iwasa, Katsumi Maeda
  • Publication number: 20190312306
    Abstract: In order to provide a lithium ion secondary battery having both high energy density and an excellent charging-rate characteristic, in the lithium ion secondary battery comprising a positive electrode, a negative electrode and an electrolyte solution, the electrolyte solution comprises 0.5 mol/l or more of Li[(FSO2)2N], 0.5 mol/l or more of LiPF6, and LiPO2F2; and the negative electrode comprises graphite deposited with amorphous carbon or graphite coated with amorphous carbon and having a specific surface area of 4 m2/g or less, as a negative electrode active material.
    Type: Application
    Filed: June 13, 2017
    Publication date: October 10, 2019
    Applicant: NEC Corporation
    Inventors: Noriyuki TAMURA, Katsumi MAEDA, Qian CHENG
  • Publication number: 20190305317
    Abstract: The object of the invention is to provide a new lithium ion battery system that can have both high energy density and fast chargeable capability. The invention provides a lithium ion battery, comprising an anode comprising an anode active material layer on an anode current collector, the anode active material layer having a mass load higher than 60 g/m2, a cathode comprising a cathode active material layer on a cathode current collector, the cathode active material layer having a mass load higher than 100 g/m2, and an electrolytic solution comprising an imide anion based lithium salt and LiPO2F2, wherein at least one of the anode and cathode active material layers comprises a spacer composed of a hard carbon.
    Type: Application
    Filed: October 6, 2016
    Publication date: October 3, 2019
    Applicant: NEC CORPORATION
    Inventors: Qian CHENG, Katsumi MAEDA, Noriyuki TAMURA
  • Publication number: 20190280300
    Abstract: An electrode for lithium ion secondary batteries, including a porous glass particle and a positive electrode active material or negative electrode active material that is capable of occluding and releasing lithium ions wherein the pore volume of the porous glass particle is from 0.1 ml/g to 2 ml/g, is used to provide a lithium ion secondary battery excellent in a charge rate property.
    Type: Application
    Filed: October 25, 2017
    Publication date: September 12, 2019
    Applicant: NEC CORPORATION
    Inventors: Katsumi MAEDA, Noriyuki TAMURA, Mika SHIBA
  • Patent number: 10374258
    Abstract: A nonaqueous electrolytic solution comprising a cyclobutenedione derivative represented by the following general formula (1): wherein R1 represents an organic group having a carbon-carbon double bond or a carbon-carbon triple bond in its structure, and R2 represents an alkyl group having 1-6 carbon atoms, an alkoxy group having 1-6 carbon atoms, a thioalkyl group having 1-6 carbon atoms, a substituted or unsubstituted thioaryl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group.
    Type: Grant
    Filed: July 1, 2015
    Date of Patent: August 6, 2019
    Assignee: NEC Corporation
    Inventors: Katsumi Maeda, Shizuka Sato, Mika Horie
  • Patent number: 10374259
    Abstract: A nonaqueous electrolyte solution including a hydrofluoroether compound represented by the following formula (1): [Formula 1] CF3CF2CF2OCHFCF2OR1??(1) wherein R1 represents a difluoromethyl group, a 2,2-difluoroethyl group, a 2,2,2-trifluoroethyl group, a 2,2,3,3,3-pentafluoropropyl group, a 2,2,3,3-tetrafluoropropyl group, a 1,1,1,3,3,3-hexafluoroisopropyl group, a 2,2,3,3,4,4,4-heptafluorobutyl group, a 2,2,3,3,4,4-hexafluorobutyl group, or a 2,2,3,3,4,4,5,5-octafluoropentyl group.
    Type: Grant
    Filed: March 2, 2016
    Date of Patent: August 6, 2019
    Assignee: NEC Corporation
    Inventor: Katsumi Maeda
  • Publication number: 20190181494
    Abstract: A nonaqueous electrolytic solution comprising a nonaqueous solvent, an electrolyte, lithium difluorophosphate, and a difluoroboron complex compound represented by general formula (1): wherein R1 and R2 each independently represent a substituted or unsubstituted alkyl group having one to six carbon atoms, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted alkoxy group, and R3 represents a hydrogen atom, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group, wherein the content of lithium bis(fluorosulfonyl)imide as the electrolyte is 0 to 80 mol % based on the total amount of moles of the electrolyte.
    Type: Application
    Filed: July 14, 2017
    Publication date: June 13, 2019
    Applicant: NEC CORPORATION
    Inventors: Katsumi MAEDA, Qian CHENG
  • Publication number: 20190044182
    Abstract: Provided are a lithium secondary battery high in capacity and excellent in charge and discharge rate characteristics, and a method for producing the same. The lithium secondary battery of the present invention includes a positive electrode containing a positive electrode active substance containing a lithium transition metal oxide, a negative electrode containing a negative electrode active substance containing a heat-treated graphite material, and an electrolytic solution, wherein the heat-treated graphite material has passages of lithium ions penetrating at least one or more layers of graphene layers from the surface of a graphene stacking structure; and the electrolytic solution contains lithium difluorophosphate.
    Type: Application
    Filed: August 8, 2016
    Publication date: February 7, 2019
    Applicant: NEC CORPORATION
    Inventors: Katsumi MAEDA, Noriyuki TAMURA, Mika SHIBA
  • Publication number: 20190027741
    Abstract: Provided are a positive electrode active material capable of inhibiting generation of gases accompanied by charging/discharging, a positive electrode and a lithium secondary cell using the positive electrode active material, and methods for manufacturing the positive electrode active material, the positive electrode, and the lithium secondary cell. The positive electrode active material comprises a coated positive electrode active material having a coating comprising at least one selected from specific phosphonic esters and specific phosphorous triesters.
    Type: Application
    Filed: December 19, 2016
    Publication date: January 24, 2019
    Applicant: NEC CORPORATION
    Inventors: Katsumi MAEDA, Sadanori HATTORI
  • Publication number: 20180351199
    Abstract: An object of the present invention is to provide a positive electrode active substance capable of suppressing gas generation associated with charge and discharge in a lithium secondary battery, and capable of suppressing gas generation associated with charge and discharge particularly even in cases where the use voltage of the lithium secondary battery is high, a positive electrode and a lithium secondary battery using the positive electrode active substance, and methods for producing these. The present invention is a positive electrode active substance for a lithium secondary battery, comprising a coated positive electrode active substance wherein a surface of a positive electrode active substance is directly coated with lithium metaphosphate.
    Type: Application
    Filed: October 31, 2016
    Publication date: December 6, 2018
    Applicant: NEC CORPORATION
    Inventors: Katsumi MAEDA, Sadanori HATTORI