Patents by Inventor Yoko Hashizume

Yoko Hashizume 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: 10749208
    Abstract: The object is to provide a lithium ion secondary battery which has an excellent cycle property even in high-temperature environment and which has small volume increase. An exemplary embodiment of the invention is a lithium ion secondary battery, comprising: a positive electrode, a negative electrode comprising a negative electrode active material, and an electrolyte liquid; wherein the electrolyte liquid comprises a chain-type fluorinated ester compound represented by a predetermined formula and a chain-type fluorinated ether compound represented by a predetermined formula; wherein the negative electrode active material comprises metal (a) that can be alloyed with lithium, metal oxide (b) that can absorb and desorb lithium ion, and carbon material (c) that can absorb and desorb lithium ion; and wherein metal (a) is silicon, and metal oxide (b) is silicon oxide.
    Type: Grant
    Filed: March 16, 2012
    Date of Patent: August 18, 2020
    Assignee: NEC CORPORATION
    Inventors: Makiko Uehara, Daisuke Kawasaki, Takehiro Noguchi, Akinobu Nakamura, Kenichi Shimura, Yoko Hashizume
  • Patent number: 10290894
    Abstract: An exemplary embodiment of the present invention is a secondary battery which comprises a negative electrode and a battery electrolyte liquid comprising a supporting salt and a non-aqueous electrolyte solvent; wherein the negative electrode is obtained by pre-forming a SEI coating film on a negative electrode structure which is formed by binding a negative electrode active substance comprising a metal (a). that can be alloyed with lithium, a metal oxide (b) that can absorb and desorb lithium ion and a carbon material (c) that can absorb and desorb lithium ion, to a negative electrode current collector with a negative electrode binder, and wherein the non-aqueous electrolyte solvent contains at least an ionic liquid.
    Type: Grant
    Filed: June 23, 2011
    Date of Patent: May 14, 2019
    Assignee: NEC CORPORATION
    Inventors: Kazuaki Matsumoto, Daisuke Kawasaki, Masahiro Suguro, Midori Shimura, Yoko Hashizume
  • Patent number: 9847180
    Abstract: The exemplary embodiment has an object to provide a nonaqueous electrolyte solution having a flame retardancy over a long period and having a good capacity maintenance rate. The exemplary embodiment is a nonaqueous electrolyte solution containing a lithium salt, at least one oxo-acid ester derivative of phosphorus selected from compounds represented by a predetermined formula, and at least one disulfonate ester selected from a cyclic disulfonate ester and a linear disulfonate ester represented by the predetermined formulae.
    Type: Grant
    Filed: December 22, 2015
    Date of Patent: December 19, 2017
    Assignee: NEC ENERGY DEVICES, LTD.
    Inventors: Shinako Kaneko, Hitoshi Ishikawa, Yoko Hashizume, Eiji Suzuki
  • Patent number: 9543618
    Abstract: An objection is to provide a high performance secondary battery having good flame retardancy and cycle properties. The present exemplary embodiment provides a secondary battery comprising an electrode assembly in which a positive electrode and a negative electrode are arranged to face each other, an electrolyte liquid and a package accommodating the electrode assembly and the electrolyte liquid, wherein the negative electrode is formed by binding a negative electrode active substance comprising a metal (a) capable of being alloyed with lithium, a metal oxide (b) capable of occluding and releasing lithium ions and a carbon material (c) capable of occluding and releasing lithium ions, to a negative electrode current collector, with a negative electrode binder, and the electrolyte liquid comprises a supporting salt and an electrolytic solvent, the electrolytic solvent comprising at least one phosphate ester compound selected from phosphite esters, phosphonate esters and bisphosphonate esters.
    Type: Grant
    Filed: July 15, 2011
    Date of Patent: January 10, 2017
    Assignee: NEC CORPORATION
    Inventors: Kazuaki Matsumoto, Daisuke Kawasaki, Masahiro Suguro, Midori Shimura, Yoko Hashizume
  • Patent number: 9466827
    Abstract: An object of the present invention is to provide a secondary battery in which the decomposition of an electrolyte liquid is suppressed and the generation of a gas is reduced, even in the case of using a laminate film as a package.
    Type: Grant
    Filed: June 23, 2011
    Date of Patent: October 11, 2016
    Assignee: NEC CORPORATION
    Inventors: Midori Shimura, Daisuke Kawasaki, Masahiro Suguro, Yoko Hashizume, Kazuaki Matsumoto
  • Patent number: 9425480
    Abstract: The object is to provide a secondary battery with higher performance, and especially to provide a secondary battery having low impedance. An exemplary embodiment of the invention is a secondary battery, comprising an electrode assembly in which a positive electrode and a negative electrode are oppositely disposed, an electrolyte liquid, and a package which encloses the electrode assembly and the electrolyte liquid inside; wherein the negative electrode is formed by binding a negative electrode active substance to a negative electrode collector with a negative electrode binder; and wherein the electrolyte liquid comprises a fluorine-containing cyclic ether compound.
    Type: Grant
    Filed: August 25, 2011
    Date of Patent: August 23, 2016
    Assignee: NEC CORPORATION
    Inventors: Masahiro Suguro, Daisuke Kawasaki, Midori Shimura, Kazuaki Matsumoto, Yoko Hashizume
  • Patent number: 9373867
    Abstract: The object is to provide a secondary battery which has an excellent cycle property even in high-temperature environment and which has small resistance increase even when it is used in high-temperature environment. An exemplary embodiment of the invention is a secondary battery, comprising: a positive electrode, a negative electrode, and an electrolyte liquid; wherein the electrolyte liquid comprises a chain-type fluorinated sulfone compound represented by a predetermined formula.
    Type: Grant
    Filed: September 27, 2011
    Date of Patent: June 21, 2016
    Assignee: NEC Corporation
    Inventors: Daisuke Kawasaki, Kenichi Shimura, Yoko Hashizume
  • Patent number: 9343740
    Abstract: There is provided a lithium ion battery which maintains the flame retardancy of an electrolyte over a long period of time, has high energy density, and has improved charge/discharge cycle characteristics, high temperature storage characteristics, and rate characteristics. The lithium ion battery according to the present exemplary embodiment is a lithium ion battery comprising an electrolyte containing at least an ionic liquid and a lithium salt, a positive electrode, and a negative electrode, wherein the negative electrode includes a negative electrode active material which is a carbon material treated with a surface treatment agent.
    Type: Grant
    Filed: July 20, 2011
    Date of Patent: May 17, 2016
    Assignee: NEC Energy Devices, Ltd.
    Inventors: Shinako Kaneko, Hitoshi Ishikawa, Yasutaka Kono, Yoko Hashizume
  • Publication number: 20160111220
    Abstract: The exemplary embodiment has an object to provide a nonaqueous electrolyte solution having a flame retardancy over a long period and having a good capacity maintenance rate. The exemplary embodiment is a nonaqueous electrolyte solution containing a lithium salt, at least one oxo-acid ester derivative of phosphorus selected from compounds represented by a predetermined formula, and at least one disulfonate ester selected from a cyclic disulfonate ester and a linear disulfonate ester represented by the predetermined formulae.
    Type: Application
    Filed: December 22, 2015
    Publication date: April 21, 2016
    Applicant: NEC ENERGY DEVICES, LTD.
    Inventors: Shinako KANEKO, Hitoshi ISHIKAWA, Yoko HASHIZUME, Eiji SUZUKI
  • Patent number: 9312073
    Abstract: The exemplary embodiment has an object to provide a nonaqueous electrolyte solution having a flame retardancy over a long period and having a good capacity maintenance rate. The exemplary embodiment is a nonaqueous electrolyte solution containing a lithium salt, at least one oxo-acid ester derivative of phosphorus selected from compounds represented by a predetermined formula, and at least one disulfonate ester selected from a cyclic disulfonate ester and a linear disulfonate ester represented by the predetermined formulae.
    Type: Grant
    Filed: February 10, 2011
    Date of Patent: April 12, 2016
    Assignee: NEC ENERGY DEVICES, LTD.
    Inventors: Shinako Kaneko, Hitoshi Ishikawa, Yoko Hashizume, Eiji Suzuki
  • Patent number: 9299985
    Abstract: Provided is a secondary battery having a good battery property at a high temperature. A secondary battery according to an exemplary embodiment of the invention comprises a negative electrode and an electrolyte liquid; wherein the negative electrode is formed by binding a negative electrode active substance on a negative electrode collector with a negative electrode binder; and wherein the electrolyte liquid comprises a compound (A) having a C?S bond. In this embodiment, the negative electrode active substance is formed by covering at least one of a metal (a) that can be alloyed with lithium and a metal oxide (b) that can absorb and desorb a lithium ion with a carbon material (c). Alternatively, the negative electrode active substance comprises a metal (a) that can be alloyed with lithium and the negative electrode binder negative electrode is a polyimide or a polyamide-imide.
    Type: Grant
    Filed: June 23, 2011
    Date of Patent: March 29, 2016
    Assignee: NEC CORPORATION
    Inventors: Yoko Hashizume, Daisuke Kawasaki, Masahiro Suguro, Midori Shimura, Kazuaki Matsumoto
  • Patent number: 9219274
    Abstract: A secondary battery having high capacity and satisfactory high-temperature cycle characteristics is provided. A secondary battery according to the exemplary embodiment has an electrode element in which a positive electrode and a negative electrode are arranged so as to face each other, an electrolytic solution and an outer package packaging the electrode element and the electrolytic solution, wherein the negative electrode is formed by binding a negative electrode active material containing at least one of a metal (a) capable of forming an alloy with lithium and a metal oxide (b) capable of absorbing and releasing lithium ions, to a negative electrode collector, with a polyimide or a polyamide-imide serving as a negative electrode binder; and the electrolytic solution contains a phosphazene compound.
    Type: Grant
    Filed: August 26, 2011
    Date of Patent: December 22, 2015
    Assignee: NEC CORPORATION
    Inventors: Daisuke Kawasaki, Masahiro Suguro, Midori Shimura, Kazuaki Matsumoto, Yoko Hashizume
  • Publication number: 20150247034
    Abstract: Provided is a thermosetting composition that can be cured at a relatively low temperature and gives a cured product having excellent heat resistance. The thermosetting composition according to the present invention is a thermosetting liquid-crystal polyester composition prepared by melt-blending a liquid-crystal polyester (A) and a compound (B) with each other. The liquid-crystal polyester (A) includes at least one of hydroxy and acyloxy at molecular chain end. The compound (B) includes a first functional group and a second functional group in molecule. The first functional group is reactive with the at least one of hydroxy and acyloxy. The second functional group is thermally polymerizable. In the thermosetting liquid-crystal polyester composition, the liquid-crystal polyester (A) is preferably a liquid-crystal polyester that contains a monomer unit derived from an aromatic compound and has an average degree of polymerization of from 3 to 30 and a melting point of 250° C. or lower.
    Type: Application
    Filed: September 25, 2013
    Publication date: September 3, 2015
    Applicants: POLYPLASTICS CO., LTD., DAICEL CORPORATION
    Inventors: Kohji Nakatani, Yoko Hashizume, Katsutoshi Sakamoto, Yoshiaki Taguchi
  • Patent number: 9123971
    Abstract: The object of an exemplary embodiment of the invention is to provide a secondary battery with a high performance in which the generation of the swelling can be suppressed and in which the cycle property is excellent. An exemplary embodiment of the invention is a secondary battery, comprising an electrode assembly in which a positive electrode and a negative electrode are oppositely disposed, an electrolyte liquid, and a package which encloses the electrode assembly and the electrolyte liquid inside; wherein the negative electrode is formed by binding a negative electrode active substance, which comprises metal (a) that can be alloyed with lithium, metal oxide (b) that can absorb and desorb lithium ion, and carbon material (c) that can absorb and desorb lithium ion, to a negative electrode collector with at least one selected from polyimides and a polyamide-imides; and wherein the electrolyte liquid comprises a compound represented by any one of predetermined formulae.
    Type: Grant
    Filed: June 23, 2011
    Date of Patent: September 1, 2015
    Assignee: NEC CORPORATION
    Inventors: Midori Shimura, Daisuke Kawasaki, Masahiro Suguro, Yoko Hashizume, Kazuaki Matsumoto
  • Patent number: 9077045
    Abstract: An object is to provide a higher-performance secondary battery, particularly to provide a secondary battery having a low impedance. The present exemplary embodiment is a secondary battery comprising an electrode assembly in which a positive electrode and a negative electrode are arranged to face each other, an electrolyte liquid, and a package accommodating the electrode assembly and the electrolyte liquid, wherein the negative electrode includes a negative electrode active substance containing at least one selected from a metal (a) capable of being alloyed with lithium, and a metal oxide (b) capable of occluding and releasing lithium ions, a negative electrode binder, and a negative electrode current collector; and the electrolyte liquid contains a sulfide compound.
    Type: Grant
    Filed: August 26, 2011
    Date of Patent: July 7, 2015
    Assignee: NEC CORPORATION
    Inventors: Masahiro Suguro, Daisuke Kawasaki, Midori Shimura, Kazuaki Matsumoto, Yoko Hashizume
  • Patent number: 8999562
    Abstract: A secondary battery capable of suppressing deterioration of rate characteristics and cycle characteristics even under a high-temperature environment is provided. The secondary battery according to an exemplary embodiment is a secondary battery having an electrode element in which a positive electrode and a negative electrode are arranged so as to face each other, an electrolytic solution and an outer package packaging the electrode element and the electrolytic solution, in which the negative electrode is formed by binding a negative electrode active material to a negative electrode collector, with a negative electrode binder; and the electrolytic solution contains an organic sulfurane compound. The secondary battery electrolytic solution according to the exemplary embodiment contains an organic sulfurane compound.
    Type: Grant
    Filed: August 26, 2011
    Date of Patent: April 7, 2015
    Assignee: NEC Corporation
    Inventors: Yoko Hashizume, Daisuke Kawasaki, Masahiro Suguro, Midori Shimura, Kazuaki Matsumoto
  • Publication number: 20140017559
    Abstract: The object is to provide a secondary battery which has an excellent cycle property even in high-temperature environment and which has small resistance increase even when it is used in high-temperature environment. An exemplary embodiment of the invention is a secondary battery, comprising: a positive electrode, a negative electrode, and an electrolyte liquid; wherein the electrolyte liquid comprises a chain-type fluorinated sulfone compound represented by a predetermined formula.
    Type: Application
    Filed: September 27, 2011
    Publication date: January 16, 2014
    Inventors: Daisuke Kawasaki, Kenichi Shimura, Yoko Hashizume
  • Publication number: 20140017572
    Abstract: The object is to provide a lithium ion secondary battery which has an excellent cycle property even in high-temperature environment and which has small volume increase. An exemplary embodiment of the invention is a lithium ion secondary battery, comprising: a positive electrode, a negative electrode comprising a negative electrode active material, and an electrolyte liquid; wherein the electrolyte liquid comprises a chain-type fluorinated ester compound represented by a predetermined formula and a chain-type fluorinated ether compound represented by a predetermined formula; wherein the negative electrode active material comprises metal (a) that can be alloyed with lithium, metal oxide (b) that can absorb and desorb lithium ion, and carbon material (c) that can absorb and desorb lithium ion; and wherein metal (a) is silicon, and metal oxide (b) is silicon oxide.
    Type: Application
    Filed: March 16, 2012
    Publication date: January 16, 2014
    Applicant: NEC CORPORATION
    Inventors: Makiko Uehara, Daisuke Kawasaki, Takehiro Noguchi, Akinobu Nakamura, Kenichi Shimura, Yoko Hashizume
  • Publication number: 20130266846
    Abstract: A secondary battery having high capacity and satisfactory high-temperature cycle characteristics is provided. A secondary battery according to the exemplary embodiment has an electrode element in which a positive electrode and a negative electrode are arranged so as to face each other, an electrolytic solution and an outer package packaging the electrode element and the electrolytic solution, wherein the negative electrode is formed by binding a negative electrode active material containing at least one of a metal (a) capable of forming an alloy with lithium and a metal oxide (b) capable of absorbing and releasing lithium ions, to a negative electrode collector, with a polyimide or a polyamide-imide serving as a negative electrode binder; and the electrolytic solution contains a phosphazene compound.
    Type: Application
    Filed: August 26, 2011
    Publication date: October 10, 2013
    Applicant: NEC CORPORATION
    Inventors: Daisuke Kawasaki, Masahiro Suguro, Midori Shimura, Kazuaki Matsumoto, Yoko Hashizume
  • Publication number: 20130266875
    Abstract: An exemplary embodiment of the present invention is a secondary battery which comprises a negative electrode and a battery electrolyte liquid comprising a supporting salt and a non-aqueous electrolyte solvent; wherein the negative electrode is obtained by pre-forming a SEI coating film on a negative electrode structure which is formed by binding a negative electrode active substance comprising a metal (a). that can be alloyed with lithium, a metal oxide (b) that can absorb and desorb lithium ion and a carbon material (c) that can absorb and desorb lithium ion, to a negative electrode current collector with a negative electrode binder, and wherein the non-aqueous electrolyte solvent contains at least an ionic liquid.
    Type: Application
    Filed: June 23, 2011
    Publication date: October 10, 2013
    Applicant: NEC CORPORATION
    Inventors: Kazuaki Matsumoto, Daisuke Kawasaki, Masahiro Suguro, Midori Shimura, Yoko Hashizume