Patents by Inventor Yuka Chikugo

Yuka Chikugo 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).

  • Lithium ion secondary battery electrode, method of manufacturing the same, and lithium ion secondary battery
    Patent number: 9356280
    Abstract: A lithium ion secondary battery electrode according to the present invention includes (A) a non-fluorinated polymer; (B) an active material; (C) a thickener; and (D) a conductive auxiliary agent. An elution ratio of (A) the non-fluorinated polymer in an electrolytic solution solvent at 60° C. is equal to or less than 1.0 mass %, and a swelling ratio of (A) the non-fluorinated polymer in the electrolytic solution solvent at 60° C. is equal to or more than 10 mass % and equal to or less than 50 mass %.
    Type: Grant
    Filed: November 8, 2012
    Date of Patent: May 31, 2016
    Assignee: NEC ENERGY DEVICES, LTD.
    Inventors: Yuka Chikugo, Hitoshi Ishikawa, Yasutaka Kono, Ippei Waki, Koh Ishiguchi
  • Binder for lithium ion secondary battery electrode, slurry obtained using the binder for electrode, electrode obtained using the slurry, and lithium ion secondary battery using the electrode
    Patent number: 9147882
    Abstract: An object of the present invention is to provide: a binder for a lithium ion secondary battery electrode, which is water-dispersible type and has favorable adhesion between active materials and between the active material and current collectors, along with charge-discharge high-temperature cycle characteristics; a slurry using the binder; an electrode using the slurry; and a lithium ion secondary battery using the electrode. The present invention relates to a binder composition for a lithium ion secondary battery electrode, which is obtained by emulsion polymerization of an ethylenically unsaturated monomer in the presence of a surfactant, the ethylenically unsaturated monomer containing, as essential constituents, 15 to 70 mass % of styrene with respect to the total mass of ethylenically unsaturated monomers, an ethylenically unsaturated carboxylic acid ester, an ethylenically unsaturated carboxylic acid and an internal cross-linking agent.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: September 29, 2015
    Assignees: SHOWA DENKO K. K., NEC ENERGY DEVICES, LTD.
    Inventors: Mitsuru Hanasaki, Kazunari Fukase, Jiro Uchida, Yasutaka Kono, Yuka Chikugo, Kou Ishiguchi
  • LITHIUM ION SECONDARY BATTERY ELECTRODE, METHOD OF MANUFACTURING THE SAME, AND LITHIUM ION SECONDARY BATTERY
    Publication number: 20140248534
    Abstract: A lithium ion secondary battery electrode according to the present invention includes (A) a non-fluorinated polymer; (B) an active material; (C) a thickener; and (D) a conductive auxiliary agent. An elution ratio of (A) the non-fluorinated polymer in an electrolytic solution solvent at 60° C. is equal to or less than 1.0 mass %, and a swelling ratio of (A) the non-fluorinated polymer in the electrolytic solution solvent at 60° C. is equal to or more than 10 mass % and equal to or less than 50 mass %.
    Type: Application
    Filed: November 8, 2012
    Publication date: September 4, 2014
    Applicant: NEC ENERGY DEVICES, LTD.
    Inventors: Yuka Chikugo, Hitoshi Ishikawa, Yasutaka Kono, Ippei Waki, Koh Ishiguchi
  • BINDER FOR LITHIUM ION SECONDARY BATTERY ELECTRODE, SLURRY OBTAINED USING THE BINDER FOR ELECTRODE, ELECTRODE OBTAINED USING THE SLURRY, AND LITHIUM ION SECONDARY BATTERY USING THE ELECTRODE
    Publication number: 20130119318
    Abstract: An object of the present invention is to provide: a binder for a lithium ion secondary battery electrode, which is water-dispersible type and has favorable adhesion between active materials and between the active material and current collectors, along with charge-discharge high-temperature cycle characteristics; a slurry using the binder; an electrode using the slurry; and a lithium ion secondary battery using the electrode. The present invention relates to a binder composition for a lithium ion secondary battery electrode, which is obtained by emulsion polymerization of an ethylenically unsaturated monomer in the presence of a surfactant, the ethylenically unsaturated monomer containing, as essential constituents, 15 to 70 mass % of styrene with respect to the total mass of ethylenically unsaturated monomers, an ethylenically unsaturated carboxylic acid ester, an ethylenically unsaturated carboxylic acid and an internal cross-linking agent.
    Type: Application
    Filed: April 15, 2011
    Publication date: May 16, 2013
    Applicants: NEC ENERGY DEVICES, LTD., SHOWA DENKO K. K.
    Inventors: Mitsuru Hanasaki, Kazunari Fukase, Jiro Uchida, Yasutaka Kono, Yuka Chikugo, Kou Ishiguchi