Patents by Inventor Yuukou Katou

Yuukou Katou 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: 11171356
    Abstract: A secondary battery of the present invention includes at least a positive electrode, a negative electrode, a separation layer that spatially separates the positive electrode and the negative electrode, and an ion conductor that is held between the positive electrode and the negative electrode and has a function of conducting ions between the positive electrode and the negative electrode. In addition, in an initial stage of using the secondary battery, the secondary battery has a characteristic of a potential increase rate of the positive electrode immediately before completion of full charging being smaller than a potential decrease rate of the negative electrode immediately before the completion of full charging and a characteristic of a potential decrease rate of the positive electrode immediately before completion of full discharging being smaller than a potential increase rate of the negative electrode immediately before the completion of full discharging.
    Type: Grant
    Filed: January 25, 2018
    Date of Patent: November 9, 2021
    Assignee: Envision AESC Energy Devices Ltd.
    Inventor: Yuukou Katou
  • Publication number: 20200303744
    Abstract: The present invention has an object to provide a lithium secondary battery having excellent battery characteristics and an electrode materializing the battery, by making it easy for an electrolyte solution or a solid electrolyte being an ionic conductor to penetrate between active materials even under a low porosity condition, in a technique for raising the electrode density by making the porosity of the electrode low in order to raise the energy density.
    Type: Application
    Filed: March 21, 2017
    Publication date: September 24, 2020
    Applicant: NEC ENERGY DEVICES, LTD.
    Inventors: Yuukou KATOU, Yasutaka KONO
  • Patent number: 10693123
    Abstract: The present invention relates to a positive electrode comprising a Mn composite oxide having a tetragonal structure represented by formula (1): Lia(MxMn2-x-yYy)(O4-wZw)(wherein 1<a?2.6, 0?x?1.2, 0?y, x+y<2, 0?w?1; M is at least one selected from the group consisting of Co, Ni, Fe, Cr and Cu; Y is at least one selected from the group consisting of Li, B, Na, Mg, Al, Ti, Si, K and Ca; Z is at least one of F or Cl; and a composite oxide having a layered structure represented by formula (2): Li(LixM1-x-yYy)O2 (wherein 0?x<0.3, 0?y<0.3; M is at least one selected from the group consisting of Co, Fe, Ni and Mn; Y is at least one selected from the group consisting of Mg, Al, Zr, Ti and Zn. According to the present invention, a lithium secondary battery having a high capacity and being excellent in cycle life can be provided.
    Type: Grant
    Filed: August 6, 2015
    Date of Patent: June 23, 2020
    Assignee: NEC Corporation
    Inventors: Makiko Takahashi, Takehiro Noguchi, Yuukou Katou
  • Publication number: 20200052351
    Abstract: A secondary battery (10) of the present invention includes at least a positive electrode (11), a negative electrode (12), a separation layer (5) that spatially separates the positive electrode (11) and the negative electrode (12), and an ion conductor that is held between the positive electrode (11) and the negative electrode (12) and has a function of conducting ions between the positive electrode (11) and the negative electrode (12).
    Type: Application
    Filed: January 25, 2018
    Publication date: February 13, 2020
    Applicant: Envision AESC Energy Devices, Ltd.
    Inventor: Yuukou KATOU
  • Publication number: 20190386335
    Abstract: A secondary battery of the present invention includes at least a positive electrode, a negative electrode, a separation layer that spatially separates the positive electrode and the negative electrode, and an ion conductor that is held between the positive electrode and the negative electrode and has a function of conducting ions between the positive electrode and the negative electrode. In addition, in an initial stage of using the secondary battery, the secondary battery has a characteristic of a potential increase rate of the positive electrode immediately before completion of full charging being smaller than a potential decrease rate of the negative electrode immediately before the completion of full charging and a characteristic of a potential decrease rate of the positive electrode immediately before completion of full discharging being smaller than a potential increase rate of the negative electrode immediately before the completion of full discharging.
    Type: Application
    Filed: January 25, 2018
    Publication date: December 19, 2019
    Applicant: Envision AESC Energy Devices Ltd.
    Inventor: Yuukou KATOU
  • Patent number: 10381686
    Abstract: The present invention relates to a nonaqueous electrolyte solution comprising a nonaqueous electrolyte solvent which comprises a fluorine-containing phosphate ester represented by a specific formula, a fluorine-containing ether represented by a specific formula, and an open-chain or cyclic acid anhydride. According to the present invention, there is provided an electrolyte solution capable of realizing a lithium secondary battery having an excellent cycle characteristics with little gas generation after charge-discharge cycles.
    Type: Grant
    Filed: July 15, 2015
    Date of Patent: August 13, 2019
    Assignee: NEC Corporation
    Inventors: Yuukou Katou, Takehiro Noguchi, Makiko Takahashi, Hideaki Sasaki
  • Patent number: 10263286
    Abstract: The present invention relates to a secondary battery electrolyte, which contains a first fluorine-containing ether compound, a second fluorine-containing ether compound, and at least one selected from fluorine-containing phosphate ester compounds and sulfone compounds, wherein the fluorine substitution rate of the first fluorine-containing ether compound is lower than that of the second fluorine-containing ether compound, and the content of the first fluorine-containing ether compound is higher than that of the second fluorine-containing ether compound. According to the present invention, with respect to batteries operating at a high voltage, and batteries supposed to be used at a high temperature for a long period, there can be provided a lithium secondary battery suppressed in the decomposition reaction of the electrolyte and improved in the life characteristics.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: April 16, 2019
    Assignee: NEC Corporation
    Inventors: Takehiro Noguchi, Yuukou Katou, Hideaki Sasaki, Makiko Takahashi, Emiko Fujii
  • Patent number: 10243234
    Abstract: An object of the present invention is to provide a secondary battery having high energy density with long-term life. The present invention relates to a secondary battery comprising a negative electrode comprising a silicon-containing compound and an electrolyte solution comprising a fluorine-containing ether compound, a fluorine-containing phosphoric acid ester, a sulfone compound and a cyclic carbonate compound in a predetermined amount respectively.
    Type: Grant
    Filed: October 21, 2015
    Date of Patent: March 26, 2019
    Assignee: NEC Corporation
    Inventors: Takehiro Noguchi, Yuukou Katou, Makiko Takahashi
  • Patent number: 10224568
    Abstract: It is an object of the present invention to provide an electrolytic solution capable of suppressing gas generation. The present exemplary embodiment is an electrolytic solution comprising a supporting salt, a nonaqueous solvent that dissolves the supporting salt, a cyclic sulfonic acid ester compound represented by predetermined formula (1), and an acid anhydride. According to the exemplary embodiment, an electrolytic solution capable of suppressing gas generation can be provided.
    Type: Grant
    Filed: July 11, 2014
    Date of Patent: March 5, 2019
    Assignee: NEC Corporation
    Inventors: Noboru Yoshida, Shinsaku Saitho, Kazuaki Matsumoto, Ikiko Shimanuki, Daisuke Kawasaki, Yuukou Katou, Hitoshi Ishikawa
  • Patent number: 10177413
    Abstract: The present invention is a lithium ion secondary battery comprising a positive electrode and a non-aqueous electrolyte solution comprising a non-aqueous electrolyte solvent, wherein the positive electrode comprises a positive electrode active material having an operating potential at 4.5 V or higher versus lithium metal, the non-aqueous electrolyte solvent comprises a fluorinated phosphate ester represented by a predetermined formula and at least one selected from the group consisting of sulfone compounds represented by predetermined formulae, and the sulfone compound is included in an amount of 5 volume % or more in the non-aqueous electrolyte solvent.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: January 8, 2019
    Assignee: NEC Corporation
    Inventors: Hideaki Sasaki, Takehiro Noguchi, Yuukou Katou, Makiko Takahashi
  • Patent number: 10014555
    Abstract: An embodiment of the present invention relates to a lithium secondary battery comprising a nonaqueous electrolytic solution comprising a phosphate compound represented by the following general formula (1): O?P(O—R1)(O—R2)(O—R3) (1), wherein R1, R2, and R3 are each alkyl group or the like or a group comprising an ether bond represented by —R4—O—R5 (R4 represents alkylene group, and R5 represents alkyl group), and at least one of R1, R2, and R3 is a group comprising an ether bond, and at least one of R1, R2, and R3 contains fluorine, and a positive electrode active material having a charge and discharge region of 4.5 V or more versus lithium.
    Type: Grant
    Filed: July 31, 2013
    Date of Patent: July 3, 2018
    Assignee: NEC Corporation
    Inventors: Takehiro Noguchi, Hideaki Sasaki, Makiko Takahashi, Yuukou Katou
  • Publication number: 20180108935
    Abstract: The object of the present invention is to provide an electrolyte solution for secondary batteries, which improves the cycle characteristics of a secondary battery operating at a high potential and used at a high temperature for a long time. The present invention relates to an electrolyte solution for secondary batteries comprising lithium difluorophosphate, a fluorine containing ether compound and a fluorine containing phosphate ester compound and/or a sulfone compound.
    Type: Application
    Filed: April 26, 2016
    Publication date: April 19, 2018
    Applicant: NEC CORPORATION
    Inventors: Takehiro NOGUCHI, Shin SERIZAWA, Yuukou KATOU
  • Patent number: 9935337
    Abstract: The present invention relates to a lithium secondary battery, comprising a positive electrode; a negative electrode; and a non-aqueous electrolyte solution, wherein the non-aqueous electrolyte solution contains a phosphate polymer represented by the following formula (1): wherein R1 to R5 each independently represents aliphatic hydrocarbon group or fluorinated aliphatic hydrocarbon group, wherein the group may have a substituent, and n represents an integer of 1 or more, with the proviso that when n is 2 or more, two or more R1(s) may be the same as, or different from each other and two or more R4(s) may be the same as, or different from each other; and a fluorinated phosphate represented by the following formula (2): wherein R6 to R8 each independently represents aliphatic hydrocarbon group or fluorinated aliphatic hydrocarbon group, wherein the group may have a substituent, with the proviso that at least one of R6 to R8 is fluorinated aliphatic hydrocarbon group.
    Type: Grant
    Filed: July 1, 2013
    Date of Patent: April 3, 2018
    Assignee: NEC Corporation
    Inventors: Makiko Takahashi, Takehiro Noguchi, Hideaki Sasaki, Yuukou Katou
  • Publication number: 20180076486
    Abstract: A lithium ion secondary battery excellent in cycle characteristics and rate characteristics is provided. The present invention relates to a lithium secondary battery having an electrolyte solution comprising one or more compounds selected from a fluorinated ether and a fluorinated phosphate ester and a separator comprising an aramid resin.
    Type: Application
    Filed: March 4, 2016
    Publication date: March 15, 2018
    Inventors: Takehiro NOGUCHI, Kenichi SHIMURA, Shin SERIZAWA, Yuukou KATOU, Takuya HASEGAWA
  • Patent number: 9905887
    Abstract: The present invention relates to a secondary battery cg a positive electrode capable of absorbing and releasing lithium, and a electrolyte solution containing a non-aqueous electrolytic solvent, wherein the positive electrode has a positive electrode active material which operates at 4.5 V or more relative to lithium, and wherein the non-aqueous electrolytic solvent contains a sulfone compound represented by a predetermined formula and a fluorinated ether compound represented by a predetermined formula.
    Type: Grant
    Filed: June 4, 2013
    Date of Patent: February 27, 2018
    Assignee: NEC Corporation
    Inventors: Makiko Takahashi, Takehiro Noguchi, Hideaki Sasaki, Yuukou Katou, Akinobu Nakamura
  • Publication number: 20170352908
    Abstract: An object of the present invention is to provide a secondary battery having high energy density with long-term life. The present invention relates to a secondary battery comprising a negative electrode comprising a silicon-containing compound and an electrolyte solution comprising a fluorine-containing ether compound, a fluorine-containing phosphoric acid ester, a sulfone compound and a cyclic carbonate compound in a predetermined amount respectively.
    Type: Application
    Filed: October 21, 2015
    Publication date: December 7, 2017
    Applicant: NEC Corporation
    Inventors: Takehiro NOGUCHI, Yuukou KATOU, Makiko TAKAHASHI
  • Patent number: 9742041
    Abstract: An object of the present invention is to provide a battery system improved in output characteristics and/or storage characteristic while taking advantage of high energy density of a lithium ion secondary battery comprising a positive electrode containing a positive electrode active material having an operating potential of 4.5 V or more relative to a lithium metal. The present invention relates to a battery system having a first battery consisting of a 5 V-level battery(s), a second battery consisting of a 4 V-level battery(s), and a control system.
    Type: Grant
    Filed: September 29, 2014
    Date of Patent: August 22, 2017
    Assignee: NEC Corporation
    Inventors: Hideaki Sasaki, Takehiro Noguchi, Yuukou Katou, Makiko Takahashi
  • Publication number: 20170229704
    Abstract: The present invention relates to a positive electrode comprising a Mn composite oxide having a tetragonal structure represented by formula (1): Lia(MxMn2-x-yYy)(O4-wZw)(wherein 1<a?2.6, 0?x?1.2, 0?y, x+y<2, 0?w?1; M is at least one selected from the group consisting of Co, Ni, Fe, Cr and Cu; Y is at least one selected from the group consisting of Li, B, Na, Mg, Al, Ti, Si, K and Ca; Z is at least one of F or Cl; and a composite oxide having a layered structure represented by formula (2): Li(LixM1-x-yYy)O2 (wherein 0?x<0.3, 0?y<0.3; M is at least one selected from the group consisting of Co, Fe, Ni and Mn; Y is at least one selected from the group consisting of Mg, Al, Zr, Ti and Zn. According to the present invention, a lithium secondary battery having a high capacity and being excellent in cycle life can be provided.
    Type: Application
    Filed: August 6, 2015
    Publication date: August 10, 2017
    Applicant: NEC Corporation
    Inventors: Makiko TAKAHASHI, Takehiro NOGUCHI, Yuukou KATOU
  • Publication number: 20170162910
    Abstract: The present invention relates to a nonaqueous electrolyte solution comprising a nonaqueous electrolyte solvent which comprises a fluorine-containing phosphate ester represented by a specific formula, a fluorine-containing ether represented by a specific formula, and an open-chain or cyclic acid anhydride. According to the present invention, there is provided an electrolyte solution capable of realizing a lithium secondary battery having an excellent cycle characteristics with little gas generation after charge-discharge cycles.
    Type: Application
    Filed: July 15, 2015
    Publication date: June 8, 2017
    Applicant: NEC Corporation
    Inventors: Yuukou KATOU, Takehiro NOGUCHI, Makiko TAKAHASHI, Hideaki SASAKI
  • Patent number: 9461335
    Abstract: There is provided a secondary battery comprising: a positive electrode capable of intercalating and deintercalating a lithium ion; a negative electrode capable of intercalating and deintercalating a lithium ion; and an electrolytic solution, wherein the electrolytic solution comprises: a fluorine-containing cyclic ether compound represented by the following formula (1); and at least one selected from a fluorine-containing chain ether compound or a fluorine-containing phosphate ester compound; wherein R1 to R6 are each independently selected from a hydrogen atom, a fluorine atom, a chlorine atom, or a fluorine-substituted, chlorine-substituted, or unsubstituted alkyl group, and at least one of R1 to R6 is selected from a fluorine atom or a fluorine-substituted alkyl group.
    Type: Grant
    Filed: February 26, 2013
    Date of Patent: October 4, 2016
    Assignee: NEC Corporation
    Inventors: Takehiro Noguchi, Hideaki Sasaki, Yuukou Katou, Makiko Takahashi