Patents by Inventor Kei Shimamoto

Kei Shimamoto 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: 20220085377
    Abstract: A lithium ion secondary battery includes: a positive electrode having a positive electrode active material layer on a surface of a positive electrode collector; a negative electrode a having a negative electrode active material layer on a surface of a negative electrode collector; and a nonaqueous electrolyte. The positive electrode, the negative electrode, and the nonaqueous electrolyte are accommodated in a battery case. The nonaqueous electrolyte contains ?-butyrolactone as a main component of a nonaqueous solvent. A monoalkyl sulfate ion-derived coat is formed on the surface of the positive electrode active material layer. A VC-derived coat is formed on the surface of the negative electrode active material layer.
    Type: Application
    Filed: September 9, 2021
    Publication date: March 17, 2022
    Inventors: Kei SHIMAMOTO, Takao FUKUNAGA, Hideyuki SUGIYAMA, Wataru MASUDA, Hiroki FUJITA, Munetaka HIGUCHI
  • Publication number: 20210320334
    Abstract: The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics in the case of using an energy storage device at a high temperature and at a high voltage and further capable of inhibiting the gas generation while maintaining a capacity retention rate after storage at a high temperature and at a high voltage and also provides an energy storage device using the same. Disclosed is a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing a carboxylic acid ester compound represented by the following general formula (I). In the formula, each of R1 and R2 independently represents a hydrogen atom, a —C(?O)—OR4 group, or the like, and R1 and R2 may be bonded to each other to form a ring structure. R3 represents a hydrogen atom or the like, and n represents an integer of 1 to 3.
    Type: Application
    Filed: February 17, 2021
    Publication date: October 14, 2021
    Applicant: MU IONIC SOLUTIONS CORPORATION
    Inventors: Kei SHIMAMOTO, Koji ABE, Shoji SHIKITA, Kazuhiro MIYOSHI
  • Publication number: 20210119255
    Abstract: Disclosed is a non-aqueous electrolytic solution for an energy storage device, including a non-aqueous solvent, an electrolyte salt, a first additive consisting of a sulfolane compound represented by the following formula (1), and a second additive which is at least one selected from the group consisting of a cyclic sulfuric ester compound represented by the following formula (2a) and a dinitrile compound represented by the following formula (2b):
    Type: Application
    Filed: May 21, 2019
    Publication date: April 22, 2021
    Applicants: MU IONIC SOLUTIONS CORPORATION, SUMITOMO SEIKA CHEMICALS CO., LTD.
    Inventors: Masahide KONDO, Kei SHIMAMOTO
  • Publication number: 20210083296
    Abstract: A lithium ion secondary battery includes: a positive electrode having a positive electrode active material layer on a surface of a positive electrode collector; a negative electrode having a negative electrode active material layer on a surface of a negative electrode collector; and a nonaqueous electrolyte. The positive electrode, the negative electrode, and the nonaqueous electrolyte are accommodated in a battery case. The nonaqueous electrolyte contains ?-butyrolactone as a main component of a nonaqueous solvent. A BOB ion-derived coat is formed on the surface of the positive electrode active material layer. A VC-derived coat is formed on the surface of the negative electrode active material layer.
    Type: Application
    Filed: September 4, 2020
    Publication date: March 18, 2021
    Inventors: Kei SHIMAMOTO, Takao FUKUNAGA, Hideyuki SUGIYAMA, Wataru MASUDA, Hiroki FUJITA, Munetaka HIGUCHI
  • Patent number: 10868336
    Abstract: The present invention provides a non-aqueous electrolytic solution for a lithium secondary battery or a lithium ion capacitor, wherein the non-aqueous electrolytic solution includes a lithium salt as dissolved in a non-aqueous solvent in a concentration of 0.8 to 1.5 M (mol/L), the non-aqueous solvent includes, in relation to the whole of the non-aqueous solvent, 5 to 25% by volume of ethylene carbonate, 5 to 25% by volume of propylene carbonate, 20 to 30% by volume of dimethyl carbonate, 20 to 40% by volume of methyl ethyl carbonate, and 10 to 20% by volume of a fluorinated chain ester; the total content of ethylene carbonate and propylene carbonate in the non-aqueous solvent is 20 to 30% by volume, the total content of dimethyl carbonate and the fluorinated chain ester in the non-aqueous solvent is 30 to 40% by volume; and the flash point of the non-aqueous electrolytic solution is 20° C. or higher, and the present invention also provides an energy storage device.
    Type: Grant
    Filed: September 29, 2016
    Date of Patent: December 15, 2020
    Assignee: UBE INDUSTRIES, LTD.
    Inventors: Koji Abe, Makoto Babazono, Masahide Kondo, Hiroshi Yanagi, Kei Shimamoto
  • Patent number: 10535867
    Abstract: The present teaching provides a non-aqueous electrolyte secondary battery provided with a non-aqueous electrolyte solution having a composition able to achieve high battery performance even in an extremely low temperature region (for example, ?30° C. or lower). The non-aqueous electrolyte solution disclosed herein contains, as non-aqueous solvents, ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC) and ethyl propionate (EP), and when the total volume of the non-aqueous solvents is 100 vol. %, the content of EC is 20 to 30 vol. %, the content of PC is 5 to 10 vol. %, the content of EP is 5 to 10 vol. %, and the content of DMC+EMC is 50 to 70 vol. %.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: January 14, 2020
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kenta Ishii, Ryosuke Ohsawa, Koji Abe, Kei Shimamoto, Makoto Babazono
  • Publication number: 20190198928
    Abstract: The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics in the case of using an energy storage device at a high temperature and at a high voltage and further capable of inhibiting the gas generation while maintaining a capacity retention rate after storage at a high temperature and at a high voltage and also provides an energy storage device using the same. Disclosed is a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing a carboxylic acid ester compound represented by the following general formula (I). In the formula, each of R1 and R2 independently represents a hydrogen atom, a —C(?O)—OR4 group, or the like, and R1 and R2 may be bonded to each other to form a ring structure. R3 represents a hydrogen atom or the like, and n represents an integer of 1 to 3.
    Type: Application
    Filed: February 27, 2019
    Publication date: June 27, 2019
    Applicant: UBE INDUSTRIES, LTD.
    Inventors: Kei Shimamoto, Koji Abe, Shoji Shikita, Kazuhiro Miyoshi
  • Patent number: 10263285
    Abstract: The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics in the case of using an energy storage device at a high temperature and at a high voltage and further capable of inhibiting the gas generation while maintaining a capacity retention rate after storage at a high temperature and at a high voltage and also provides an energy storage device using the same. Disclosed is a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing a carboxylic acid ester compound represented by the following general formula (I). In the formula, each of R1 and R2 independently represents a hydrogen atom, a —C(?O)—OR4 group, or the like, and R1 and R2 may be bonded to each other to form a ring structure. R3 represents a hydrogen atom or the like, and n represents an integer of 1 to 3.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: April 16, 2019
    Assignee: UBE INDUSTRIES, LTD.
    Inventors: Kei Shimamoto, Koji Abe, Shoji Shikita, Kazuhiro Miyoshi
  • Patent number: 10263287
    Abstract: Provided are a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the electrolyte salt including at least one first lithium salt selected from LiPF6, LiBF4, LiN(SO2F)2, LiN(SO2CF3)2, and LiN(SO2C2F5)2, and at least one second lithium salt selected from a lithium salt having an oxalate structure, a lithium salt having a phosphate structure, and a lithium salt having an S?O group, with a sum total of the first lithium salt and the second lithium salt being four or more, and an energy storage device using the same. This nonaqueous electrolytic solution is not only able to improve electrochemical characteristics at a high temperature and much more improve a discharge capacity retention rate and low-temperature output characteristics after a high-temperature storage test but also able to improve low-temperature input characteristics even for high-density electrodes.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: April 16, 2019
    Assignee: UBE INDUSTRIES, LTD.
    Inventors: Koji Abe, Kei Shimamoto
  • Patent number: 10164293
    Abstract: Disclosed are a non-aqueous electrolytic solution, which can improve cycle characteristics when a power storage device is used at high temperature and high voltage, and a power device using the same. The non-aqueous electrolytic solution according to the present invention comprises, in addition to a non-aqueous solvent and an electrolyte salt dissolved therein, a compound represented by the following formula (I): wherein n is an integer of 1 or 2; and when n is 1, L represents a straight or branched unsaturated hydrocarbon group of which at least one hydrogen atom is optionally substituted by a halogen atom, a cycloalkyl group of which at least one hydrogen atom is optionally substituted by a halogen atom, or an aryl group of which at least one hydrogen atom is optionally substituted by a halogen atom; and when n is 2, L represents a saturated or unsaturated divalent hydrocarbon group which optionally contains ether bond(s), or an arylene group.
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: December 25, 2018
    Assignee: UBE INDUSTRIES, LTD.
    Inventors: Koji Abe, Kei Shimamoto, Shoji Shikita
  • Patent number: 10093688
    Abstract: A nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, containing a compound of formula (X): where R10 and R20 are each a group selected from an alkyl having 1 to 8 carbon atoms, an alkenyl having 2 to 6 carbon atoms, an alkynyl having 3 to 6 carbon atoms, and an aryl having 6 to 12 carbon atoms, or a lithium; and X is a polar group (i) containing a —C(?O), a —P(?O), or an —S(?O)2 group, a polar group (ii) containing a —CN or an alkyl group having 1 to 6 carbon atoms, in which a part of hydrogen atoms is substituted with a fluorine atom, or a 4- to 7-membered ring polar group (iii) containing a —C(?O)—O— or a —C(?O)—N— group, where when X is a 4- to 7-membered ring polar group (iii) containing —C(?O)—N—, at least one of R10 and R20 is lithium.
    Type: Grant
    Filed: May 19, 2015
    Date of Patent: October 9, 2018
    Assignee: UBE INDUSTRIES, LTD.
    Inventors: Yuichi Kotou, Tatsuo Fujino, Kei Shimamoto, Shuichi Koso, Shoji Shikita, Yosuke Sato, Junichi Chika
  • Publication number: 20180277900
    Abstract: The present invention provides a non-aqueous electrolytic solution for a lithium secondary battery or a lithium ion capacitor, wherein the non-aqueous electrolytic solution includes a lithium salt as dissolved in a non-aqueous solvent in a concentration of 0.8 to 1.5 M (mol/L), the non-aqueous solvent includes, in relation to the whole of the non-aqueous solvent, 5 to 25% by volume of ethylene carbonate, 5 to 25% by volume of propylene carbonate, 20 to 30% by volume of dimethyl carbonate, 20 to 40% by volume of methyl ethyl carbonate, and 10 to 20% by volume of a fluorinated chain ester; the total content of ethylene carbonate and propylene carbonate in the non-aqueous solvent is 20 to 30% by volume, the total content of dimethyl carbonate and the fluorinated chain ester in the non-aqueous solvent is 30 to 40% by volume; and the flash point of the non-aqueous electrolytic solution is 20° C. or higher, and the present invention also provides an energy storage device.
    Type: Application
    Filed: September 29, 2016
    Publication date: September 27, 2018
    Applicant: UBE INDUSTRIES, LTD.
    Inventors: Koji ABE, Makoto BABAZONO, Masahide KONDO, Hiroshi YANAGI, Kei SHIMAMOTO
  • Publication number: 20180205071
    Abstract: The present teaching provides a non-aqueous electrolyte secondary battery provided with a non-aqueous electrolyte solution having a composition able to achieve high battery performance even in an extremely low temperature region (for example, ?30° C. or lower). The non-aqueous electrolyte solution disclosed herein contains, as non-aqueous solvents, ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC) and ethyl propionate (EP), and when the total volume of the non-aqueous solvents is 100 vol. %, the content of EC is 20 to 30 vol. %, the content of PC is 5 to 10 vol. %, the content of EP is 5 to 10 vol. %, and the content of DMC+EMC is 50 to 70 vol. %.
    Type: Application
    Filed: January 12, 2018
    Publication date: July 19, 2018
    Inventors: Kenta Ishii, Ryosuke Ohsawa, Koji Abe, Kei Shimamoto, Makoto Babazono
  • Publication number: 20180166746
    Abstract: The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics in the case of using an energy storage device at a high temperature and at a high voltage and further capable of inhibiting the gas generation while maintaining a capacity retention rate after storage at a high temperature and at a high voltage and also provides an energy storage device using the same. Disclosed is a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing a carboxylic acid ester compound represented by the following general formula (I). In the formula, each of R1 and R2 independently represents a hydrogen atom, a —C(?O)—OR4 group, or the like, and R1 and R2 may be bonded to each other to form a ring structure. R3 represents a hydrogen atom or the like, and n represents an integer of 1 to 3.
    Type: Application
    Filed: December 17, 2014
    Publication date: June 14, 2018
    Applicant: UBE INDUSTRIES, LTD.
    Inventors: Kei SHIMAMOTO, Koji ABE, Shoji SHIKITA, Kazuhiro MIYOSHI
  • Publication number: 20180114651
    Abstract: Provided are (1) a nonaqueous electrolytic solution having lithium hexafluorophosphate dissolved in a nonaqueous solvent containing a cyclic carbonate and a linear carbonate, the nonaqueous electrolytic solution including, as a dissolution aid of lithium difluorophosphate, a linear ether compound containing a methoxy group and having a carbon number of 2 or more, a ratio (% by volume/% by mass) of a proportion (% by volume) of the dissolution aid to the total volume of the nonaqueous solvent to an amount (% by mass) of lithium difluorophosphate in the nonaqueous electrolytic solution being 0.1 or more and 5 or less, and lithium difluorophosphate being dissolved in an amount of 1.2% by mass or more at 25° C.; and (2) a lithium secondary battery and a lithium ion capacitor each using the nonaqueous electrolytic solution. The nonaqueous electrolytic solution is excellent in output characteristics and high temperature cyclic property and is capable of suppressing a metal elution amount.
    Type: Application
    Filed: November 16, 2015
    Publication date: April 26, 2018
    Applicant: UBE INDUSTRIES, LTD.
    Inventors: Kei SHIMAMOTO, Yousuke KISHIDA
  • Patent number: 9934911
    Abstract: The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics in a broad temperature range and an energy storage device using the same. [1] A nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing, as an additive, an SO4 group-containing compound having a specified structure and [2] an energy storage device including a positive electrode, a negative electrode, and a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, wherein the nonaqueous electrolytic solution contains, as an additive, 0.001% by mass or more and less than 5% by mass of an SO4 group-containing compound having a specified structure in the nonaqueous electrolytic solution, are disclosed.
    Type: Grant
    Filed: March 31, 2014
    Date of Patent: April 3, 2018
    Assignee: UBE INDUSTRIES, LTD.
    Inventors: Kei Shimamoto, Koji Abe, Yuichi Kotou, Shoji Shikita
  • Publication number: 20170275311
    Abstract: The present invention is concerned with a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing a compound represented by the following general formula (X), in which a polar group (X) is bound to a phosphorus atom (P), and capable of improving electrochemical characteristics in a broad temperature range; an energy storage device using the same; and a novel compound.
    Type: Application
    Filed: May 19, 2015
    Publication date: September 28, 2017
    Applicant: Ube Industries, Ltd.
    Inventors: Yuichi KOTOU, Tatsuo FUJINO, Kei SHIMAMOTO, Shuichi KOSO, Shoji SHIKITA, Yosuke SATO, Junichi CHIKA
  • Publication number: 20170271091
    Abstract: A nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing a lithium salt having a specific ?,?-dihydroxy carboxylic acid ester structure, phosphono hydroxy carboxylic acid structure, alkoxycarbonyl hydroxy carboxylic acid structure, or formyloxy structure; an energy storage device using the nonaqueous electrolytic solution; and a lithium salt used for the nonaqueous electrolytic solution. This nonaqueous electrolytic solution makes it possible not only to improve the electrochemical characteristics when the energy storage device is used at a high temperature and a high voltage and to improve the capacity retention rate after high-voltage and high-temperature storage, but also to suppress gas generation.
    Type: Application
    Filed: May 13, 2015
    Publication date: September 21, 2017
    Applicant: UBE INDUSTRIES, LTD.
    Inventors: Koji ABE, Shoji SHIKITA, Junichi CHIKA, Kei SHIMAMOTO, Yosuke SATO
  • Publication number: 20170222268
    Abstract: Provided are a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the electrolyte salt including at least one first lithium salt selected from LiPF6, LiBF4, LiN(SO2F)2, LiN(SO2CF3)2, and LiN(SO2C2F5)2, and at least one second lithium salt selected from a lithium salt having an oxalate structure, a lithium salt having a phosphate structure, and a lithium salt having an S?O group, with a sum total of the first lithium salt and the second lithium salt being four or more, and an energy storage device using the same. This nonaqueous electrolytic solution is not only able to improve electrochemical characteristics at a high temperature and much more improve a discharge capacity retention rate and low-temperature output characteristics after a high-temperature storage test but also able to improve low-temperature input characteristics even for high-density electrodes.
    Type: Application
    Filed: July 13, 2015
    Publication date: August 3, 2017
    Applicant: UBE INDUSTRIES, LTD.
    Inventors: Koji ABE, Kei SHIMAMOTO
  • Publication number: 20170194664
    Abstract: Disclosed are a non-aqueous electrolytic solution, which can improve cycle characteristics when a power storage device is used at high temperature and high voltage, and a power device using the same. The non-aqueous electrolytic solution according to the present invention comprises, in addition to a non-aqueous solvent and an electrolyte salt dissolved therein, a compound represented by the following formula (I): wherein n is an integer of 1 or 2; and when n is 1, L represents a straight or branched unsaturated hydrocarbon group of which at least one hydrogen atom is optionally substituted by a halogen atom, a cycloalkyl group of which at least one hydrogen atom is optionally substituted by a halogen atom, or an aryl group of which at least one hydrogen atom is optionally substituted by a halogen atom; and when n is 2, L represents a saturated or unsaturated divalent hydrocarbon group which optionally contains ether bond(s), or an arylene group.
    Type: Application
    Filed: May 28, 2015
    Publication date: July 6, 2017
    Inventors: Koji ABE, Kei SHIMAMOTO, Shoji SHIKITA