Patents by Inventor Mitsuru Hanasaki

Mitsuru Hanasaki 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: 20200395613
    Abstract: The invention relates to a method for producing a slurry for a nonaqueous battery electrode, a method for producing a nonaqueous battery electrode, and a method for producing a nonaqueous battery. The method for producing a slurry for a nonaqueous battery electrode includes a dispersing step of dispersing a conductive auxiliary agent in an aqueous binder composition, and a mixing step of mixing the conductive auxiliary agent-containing binder composition obtained in the dispersing step with an active material. In the conductive auxiliary agent-containing binder composition, a particle diameter at which particles begin to appear, which is measured according to a degree of dispersion by a grain gauge method, is 90 ?m or less.
    Type: Application
    Filed: November 16, 2018
    Publication date: December 17, 2020
    Applicant: SHOWA DENKO K. K.
    Inventors: Tomonori KURATA, Kirida KUNANURUKSAPONG, Mitsuru HANASAKI
  • Publication number: 20200350590
    Abstract: A binder for a nonaqueous battery electrode, the nonaqueous battery electrode using the binder for the nonaqueous battery electrode, and a nonaqueous battery. The binder for a nonaqueous battery electrode contains a copolymer (P) of an ethylenically unsaturated monomer (A) essentially containing a styrene-based monomer (a1) and a (meta)acrylic ester (a2), and a surfactant (B1) having an ethylenically unsaturated bond, wherein the total amount of structure units derived from the surfactant (B1) having the ethylenically unsaturated bond in the copolymer (P) and the surfactant (B2) not contained in the copolymer (P) is 0.10 to 1.00 parts by mass based on 100 parts by mass of the copolymer (P). Also disclosed is a method for producing the binder.
    Type: Application
    Filed: December 26, 2018
    Publication date: November 5, 2020
    Applicant: SHOWA DENKO K. K.
    Inventors: Junya UCHIYASHIKI, Mitsuru HANASAKI, Tomonori KURATA
  • Patent number: 10811686
    Abstract: A slurry for a positive electrode of a lithium-ion secondary battery. Also disclosed is a positive electrode for a lithium-ion secondary battery obtained using the slurry for a positive electrode of a lithium-ion secondary battery, and a production method for the electrode; and a lithium-ion secondary battery provided with the positive electrode for a lithium-ion secondary battery, and a production method for the battery. The slurry for a positive electrode of a lithium-ion secondary battery includes a positive electrode active material (A), a conductive auxiliary agent (B), a resin binder (C), a thickening dispersant (D), and water (E), wherein the thickening dispersant (D) includes a polyalkylene oxide having a phenyl group in a side chain thereof.
    Type: Grant
    Filed: August 3, 2016
    Date of Patent: October 20, 2020
    Assignee: SHOWA DENKO K.K.
    Inventors: Yusuke Aoki, Mitsuru Hanasaki
  • Publication number: 20190058195
    Abstract: The invention relates to a copolymer for binders, which is capable of reducing the internal resistance of a battery, while ensuring sufficient binding properties between active materials and between an active material and a collector in a nonaqueous battery electrode; a composition for binders; a slurry for nonaqueous battery electrodes; a nonaqueous battery electrode; and a nonaqueous battery. This copolymer for binders is a copolymer for binders (P) of a monomer mixture (M) that contains at least a monomer (A) represented by general formula (1) and a (meth)acrylate salt monomer (B); and an amount of structure derived from the monomer (A) based on the copolymer for binders (P) is set to 0.5 to 20.0% by mass. (In the formula, each of R1 and R2 independently represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.
    Type: Application
    Filed: February 16, 2017
    Publication date: February 21, 2019
    Applicant: SHOWA DENKO K.K.
    Inventors: Mitsuru HANASAKI, Yasuhiro NAKAGAWA
  • Publication number: 20190020035
    Abstract: An aqueous binder composition for a secondary battery electrode containing a silane coupling agent without ethylenically unsaturated bonds, a resin which is a polymer of at least one kind of ethylenically unsaturated monomers, a resin which is a polymer of at least one kind of ethylenically unsaturated monomer, and at least one kind of solvent selected from water and a hydrophilic solvent. The amount of silane coupling agent is from 0.5 to 9 parts by mass based on 100 parts by mass of ethylenically unsaturated monomer. The pH of the composition is 2.5 to 8.0. Also disclosed is a binder obtained by curing the aqueous binder composition, a slurry containing the aqueous binder composition and an active material, a secondary battery electrode obtained by curing the slurry, and a secondary battery including the secondary battery electrode.
    Type: Application
    Filed: December 28, 2016
    Publication date: January 17, 2019
    Applicant: SHOWA DENKO K.K.
    Inventors: Mitsuru HANASAKI, Tomonori KURATA, Junya UCHIYASHIKI, Yasuhiro NAKAGAWA
  • Publication number: 20180301704
    Abstract: A binder composition for nonaqueous battery electrodes essentially contains (A) an ethylenically unsaturated monomer and (B) a surfactant, and further satisfies any two or more conditions of the following (I) to (III): (I) (A) the ethylenically unsaturated monomer includes (a) a phosphoric acid group-containing ethylenically unsaturated monomer; (II) (B) the surfactant comprises (b) a phosphoric acid group-containing surfactant; and (III) the composition including (C) a neutralizing agent containing an alkali metal compound and/or an alkali earth metal compound.
    Type: Application
    Filed: June 1, 2016
    Publication date: October 18, 2018
    Applicant: SHOWA DENKO K.K.
    Inventors: Junya UCHIYASHIKI, Mitsuru HANASAKI, Tomonori KURATA
  • Publication number: 20180233750
    Abstract: A slurry for a positive electrode of a lithium-ion secondary battery. Also disclosed is a positive electrode for a lithium-ion secondary battery obtained using the slurry for a positive electrode of a lithium-ion secondary battery, and a production method for the electrode; and a lithium-ion secondary battery provided with the positive electrode for a lithium-ion secondary battery, and a production method for the battery. The slurry for a positive electrode of a lithium-ion secondary battery includes a positive electrode active material (A), a conductive auxiliary agent (B), a resin binder (C), a thickening dispersant (D), and water (E), wherein the thickening dispersant (D) includes a polyalkylene oxide having a phenyl group in a side chain thereof.
    Type: Application
    Filed: August 3, 2016
    Publication date: August 16, 2018
    Applicant: SHOWA DENKO K.K.
    Inventors: Yusuke AOKI, Mitsuru HANASAKI
  • Patent number: 9947929
    Abstract: A binder composition for nonaqueous battery electrodes is prepared by adding a small amount of an acetylene glycol compound to an aqueous polymer emulsion obtained by emulsion polymerization of a monomer mixture comprising from 15 to 70% by mass of styrene (a), from 20 to 80% by mass of an ethylenically unsaturated carboxylate (b), from 1 to 10% by mass of an ethylenically unsaturated carboxylic acid (c), from 0.1 to 5% by mass of a crosslinkable ethylenically unsaturated monomer (d), and from 0 to 20% by mass of another monoethylenically unsaturated monomer (e). When the above binder composition is used, an active material is not peeled off in the step of cutting a collector even when a small amount of the binder is used, and a nonaqueous battery excellent in a charge-discharge cycle property can be produced.
    Type: Grant
    Filed: June 20, 2014
    Date of Patent: April 17, 2018
    Assignee: SHOWA DENKO K.K.
    Inventors: Tomonori Kurata, Mitsuru Hanasaki, Junya Uchiyashiki
  • Publication number: 20160248095
    Abstract: A binder composition for nonaqueous battery electrodes is prepared by adding a small amount of an acetylene glycol compound to an aqueous polymer emulsion obtained by emulsion polymerization of a monomer mixture comprising from 15 to 70% by mass of styrene (a), from 20 to 80% by mass of an ethylenically unsaturated carboxylate (b), from 1 to 10% by mass of an ethylenically unsaturated carboxylic acid (c), from 0.1 to 5% by mass of a crosslinkable ethylenically unsaturated monomer (d), and from 0 to 20% by mass of another monoethylenically unsaturated monomer (e). When the above binder composition is used, an active material is not peeled off in the step of cutting a collector even when a small amount of the binder is used, and a nonaqueous battery excellent in a charge-discharge cycle property can be produced.
    Type: Application
    Filed: June 20, 2014
    Publication date: August 25, 2016
    Applicant: SHOWA DENKO K.K.
    Inventors: Tomonori KURATA, Mitsuru HANASAKI, Junya UCHIYASHIKI
  • Publication number: 20150357647
    Abstract: The present invention provides a binder for lithium ion secondary battery electrodes that is obtained by emulsion polymerization of an ethylenically unsaturated monomer in an aqueous medium in the presence of a surfactant, the ethylenically unsaturated monomer being composed, with respect to the total mass of the ethylenically unsaturated monomer, of 15% by mass to 70% by mass of styrene, 1% by mass to 10% by mass of an N atom-containing ethylenically unsaturated monomer, 1% by mass to 10% by mass of an ethylenically unsaturated carboxylic acid, 0.1% by mass to 5% by mass of an internal crosslinking agent, and 22% by mass to 82.9% by mass of another ethylenically unsaturated monomer that is copolymerizable with these substances, and has a glass transition temperature of ?55° C. to 30° C.
    Type: Application
    Filed: January 20, 2014
    Publication date: December 10, 2015
    Applicant: SHOWA DENKO K.K.
    Inventors: Tomonori KURATA, Mitsuru HANASAKI, Kazunari FUKASE
  • 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
  • Publication number: 20140054496
    Abstract: Provided is a slurry for lithium ion secondary battery electrodes, which has proper binding properties between active materials and between an active material and a current collector, an electrode using the slurry, and a lithium ion secondary battery using the electrode and having both a high initial discharge capacity and an excellent charge-discharge high-temperature cycle characteristic. The present invention relates to a slurry for lithium ion secondary battery electrodes, which is obtained using a binder for battery electrodes and an active material and has a pH of 3.0 to 6.0. Preferably, the slurry contains a binder for battery electrodes in an amount of 0.2 to 4.0% by mass based on the active material.
    Type: Application
    Filed: January 31, 2012
    Publication date: February 27, 2014
    Applicant: SHOWA DENKO K. K.
    Inventors: Mitsuru Hanasaki, Kazunari Fukase, Daigo Ito
  • 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