Patents by Inventor Ippei Waki

Ippei Waki 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: 10424789
    Abstract: Provided is a negative electrode for a lithium ion secondary battery including: a negative electrode current collector; and a negative electrode active material for a lithium ion secondary battery which is disposed on the negative electrode current collector and contains a carbon material and an aqueous binder. The carbon material is a graphite particle having a covering layer containing amorphous carbon by 5 wt % or less relative to a total weight of the carbon material.
    Type: Grant
    Filed: June 19, 2017
    Date of Patent: September 24, 2019
    Assignee: Envision AESC Japan Ltd.
    Inventors: Ippei Waki, Yuji Tanjo
  • Patent number: 10388955
    Abstract: A negative electrode for a lithium ion secondary battery includes: a negative electrode current collector (11); and a negative electrode active material for a lithium ion secondary battery, which is disposed on the negative electrode current collector and contains a carbon material and an aqueous binder. The carbon material is a graphite particle having a covering layer containing amorphous carbon by 5 wt % or less relative to a total weight of the carbon material.
    Type: Grant
    Filed: June 19, 2017
    Date of Patent: August 20, 2019
    Assignee: Envision AESC Japan Ltd.
    Inventors: Ippei Waki, Yuji Tanjo
  • Patent number: 10181619
    Abstract: An organic acid included in a nonaqueous electrolyte solution of a secondary battery is reduced. During preparation of a film-covered battery 1, the nonaqueous electrolyte solution is injected into an covering 5 of the film-covered battery 1 having an electrode including: the electrode active material, the binder, and the organic acid, the organic acid in the nonaqueous electrolyte solution is decomposed by electrical charging of a battery until a voltage level is equal to or above a decomposition voltage of the organic acid, and the gas that is produced by decomposition is degassed from the cut portion 6 of the covering 5.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: January 15, 2019
    Assignee: AUTOMOTIVE ENERGY SUPPLY CORPORATION
    Inventors: Hidetoshi Tamura, Ippei Waki, Tatsuji Numata, Hiroshi Yageta
  • Publication number: 20180006304
    Abstract: Provided is a negative electrode for a lithium ion secondary battery including: a negative electrode current collector; and a negative electrode active material for a lithium ion secondary battery which is disposed on the negative electrode current collector and contains a carbon material and an aqueous binder.
    Type: Application
    Filed: June 19, 2017
    Publication date: January 4, 2018
    Applicant: Automotive Energy Supply Corporation
    Inventors: Ippei Waki, Yuji Tanjo
  • Publication number: 20180006305
    Abstract: A negative electrode for a lithium ion secondary battery includes: a negative electrode current collector (11); and a negative electrode active material for a lithium ion secondary battery, which is disposed on the negative electrode current collector and contains a carbon material and an aqueous binder. The carbon material is a graphite particle having a covering layer containing amorphous carbon by 5 wt % or less relative to a total weight of the carbon material.
    Type: Application
    Filed: June 19, 2017
    Publication date: January 4, 2018
    Applicant: Automotive Energy Supply Corporation
    Inventors: Ippei Waki, Yuji Tanjo
  • 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
  • Publication number: 20150104711
    Abstract: A negative electrode for a lithium ion secondary battery according to the present invention includes a negative electrode active material and a binder, in which the negative electrode active material satisfies the following requirements (A), (B), and (C): (A) graphite powder is used as a core material, and at least a part of a surface of the graphite powder is coated with a carbon material having lower crystallinity than the graphite powder; (B) a specific surface area measured using a nitrogen adsorption BET method is more than or equal to 0.8 m2/g and less than or equal to 5.3 m2/g; and (C) an amount of dibutyl phthalate absorption measured according to JIS K 6217-4 is more than or equal to 32 cm3/100 g and less than or equal to 45 cm3/100 g.
    Type: Application
    Filed: May 30, 2013
    Publication date: April 16, 2015
    Applicant: NEC Energy Devices, Ltd.
    Inventors: Ippei Waki, Yasutaka Kono, Tomoyuki Ohta
  • Publication number: 20150089798
    Abstract: An organic acid included in a nonaqueous electrolyte solution of a secondary battery is reduced. During preparation of a film-covered battery 1, the nonaqueous electrolyte solution is injected into an covering 5 of the film-covered battery 1 having an electrode including: the electrode active material, the binder, and the organic acid, the organic acid in the nonaqueous electrolyte solution is decomposed by electrical charging of a battery until a voltage level is equal to or above a decomposition voltage of the organic acid, and the gas that is produced by decomposition is degassed from the cut portion 6 of the covering 5.
    Type: Application
    Filed: September 25, 2014
    Publication date: April 2, 2015
    Applicant: AUTOMOTIVE ENERGY SUPPLY CORPORATION
    Inventors: Hidetoshi TAMURA, Ippei Waki, Tatsuji NUMATA, Hiroshi YAGETA
  • 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
  • Publication number: 20130266847
    Abstract: The object of an exemplary embodiment of the invention is to provide a lithium secondary battery which has high energy density by containing a positive electrode active substance operating at a potential of 4.5 V or higher with respect to lithium and which has excellent cycle property. An exemplary embodiment of the invention is an lithium secondary battery, which comprises a positive electrode comprising a positive electrode active substance and an electrolyte liquid comprising a nonaqueous electrolyte solvent; wherein the positive electrode active substance operates at a potential of 4.5 V or higher with respect to lithium; and wherein the nonaqueous electrolyte solvent comprises a fluorine-containing phosphate represented by a prescribed formula.
    Type: Application
    Filed: December 7, 2011
    Publication date: October 10, 2013
    Applicants: NEC ENERGY DEVICES, LTD., NEC CORPORATION
    Inventors: Takehiro Noguchi, Hideaki Sasaki, Makiko Uehara, Ippei Waki, Shinako Kaneko, Hiroshi Hatakeyama, Shinsaku Saitho, Yuukou Katou
  • Publication number: 20130029218
    Abstract: A nonaqueous electrolyte secondary battery comprising positive and negative electrodes capable of absorbing and desorbing lithium ions; a nonaqueous electrolytic solution; and a separator provided between the positive electrode and the negative electrode. The negative electrode comprises a negative electrode active material layer containing at least a styrene polymer as a binder in a content of 0.3 to 8.0 mass % based on the total mass of the negative electrode active material layer. The nonaqueous electrolytic solution contains at least a cyclic sulfonic acid ester including at least two sulfonyl groups in a content of 0.002 to 5.0 mass % based on the total mass of the nonaqueous electrolytic solution.
    Type: Application
    Filed: February 8, 2011
    Publication date: January 31, 2013
    Applicant: NEC ENERGY DEVICES, LTD.
    Inventors: Ippei Waki, Hideaki Sasaki, Takehiro Noguchi, Yasutaka Kono, Hitoshi Ishikawa