Patents by Inventor Kazunori Urao
Kazunori Urao 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).
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Patent number: 11715828Abstract: A positive-electrode material for a lithium secondary battery is provided. The material includes a lithium oxide compound or a complex oxide as reactive substance. The material also includes at least one type of carbon material, and optionally a binder. A first type of carbon material is provided as a coating on the reactive substance particles surface. A second type of carbon material is carbon black. And a third type of carbon material is a fibrous carbon material provided as a mixture of at least two types of fibrous carbon material different in fiber diameter and/or fiber length. Also, a method for preparing the material as well as lithium secondary batteries including the material is provided.Type: GrantFiled: November 12, 2020Date of Patent: August 1, 2023Assignees: HYDRO-QUÉBEC, SEI CORPORATIONInventors: Karim Zaghib, Abdelbast Guerfi, Pierre Hovington, Takehiko Sawai, Shinji Saito, Kazunori Urao
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Publication number: 20230094444Abstract: A method for producing an electrode material for a lithium-ion secondary battery. The method includes the following steps: (a) mixing components of a basic ingredient or active substance of electrode material and a conductive carbon material to obtain a conductive carbon material-composited material; (b) mixing the conductive carbon material-composited material and a surface layer-forming material; an (c) burning the mixture obtained at step (b) to obtain the electrode material. Also, a lithium-ion secondary battery including an electrode which includes the material.Type: ApplicationFiled: November 28, 2022Publication date: March 30, 2023Applicant: HYDRO-QUÉBECInventors: Vincent GARIEPY, Abdelbast GUERFI, Kazuma Hanai, Pierre HOVINGTON, Shinji Saito, Takehiko Sawai, Kazunori Urao, Karim ZAGHIB
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Patent number: 11545668Abstract: A method for producing an electrode material for a lithium-ion secondary battery. The method includes the following steps: (a) mixing components of a basic ingredient or active substance of electrode material and a conductive carbon material to obtain a conductive carbon material-composited material; (b) mixing the conductive carbon material-composited material and a surface layer-forming material; an (c) burning the mixture obtained at step (b) to obtain the electrode material. Also, a lithium-ion secondary battery including an electrode which comprises the material.Type: GrantFiled: October 21, 2013Date of Patent: January 3, 2023Assignee: HYDRO-QUEBECInventors: Vincent Gariepy, Abdelbast Guerfi, Kazuma Hanai, Pierre Hovington, Shinji Saito, Takehiko Sawai, Kazunori Urao, Karim Zaghib
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Publication number: 20210280922Abstract: The present invention provides a lithium secondary battery for an ISS which can be discharged at not less than 20 ItA when temperature is ?30 degrees centigrade and can be charged at not less than 50 ItA. The positive electrode material consists of a mixture of lithium-containing metal phosphate compound particles whose surfaces are coated with an amorphous carbon material and a conductive carbon material, in which atoms of the surface carbon materials are chemically bonded to one another. The negative electrode material contains at least one kind of particles selected from among graphite particles whose surfaces are coated with an amorphous carbon material, having a specific surface area of not less than 6 m2/g and soft carbon particles. A mixed electrolyte contains lithium hexafluorophosphate and lithium bis fluorosulfonyl imide.Type: ApplicationFiled: May 18, 2021Publication date: September 9, 2021Inventors: Takehiko SAWAI, Shinji SAITO, Kazunori URAO
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Patent number: 10944107Abstract: A positive-electrode material for a lithium secondary battery is provided. The material includes a lithium oxide compound or a complex oxide as reactive substance. The material also includes at least one type of carbon material, and optionally a binder. A first type of carbon material is provided as a coating on the reactive substance particles surface. A second type of carbon material is carbon black. And a third type of carbon material is a fibrous carbon material provided as a mixture of at least two types of fibrous carbon material different in fiber diameter and/or fiber length. Also, a method for preparing the material as well as lithium secondary batteries including the material is provided.Type: GrantFiled: June 5, 2018Date of Patent: March 9, 2021Assignee: HYDRO-QUÉBECInventors: Karim Zaghib, Abdelbast Guerfi, Pierre Hovington, Takehiko Sawai, Shinji Saito, Kazunori Urao
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Publication number: 20210066718Abstract: A positive-electrode material for a lithium secondary battery is provided. The material includes a lithium oxide compound or a complex oxide as reactive substance. The material also includes at least one type of carbon material, and optionally a binder. A first type of carbon material is provided as a coating on the reactive substance particles surface. A second type of carbon material is carbon black. And a third type of carbon material is a fibrous carbon material provided as a mixture of at least two types of fibrous carbon material different in fiber diameter and/or fiber length. Also, a method for preparing the material as well as lithium secondary batteries including the material is provided.Type: ApplicationFiled: November 12, 2020Publication date: March 4, 2021Applicants: HYDRO-QUÉBEC, SEI CorporationInventors: Karim ZAGHIB, Abdelbast GUERFI, Pierre HOVINGTON, Takehiko SAWAI, Shinji SAITO, Kazunori URAO
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Patent number: 10879567Abstract: The present invention provides a method for producing a lithium secondary battery in which peeling of an active substance can be prevented and the generation of metal powder can be prevented when a power collection foil is processed at an electrode production step. The method for producing the lithium secondary battery includes an electrode-producing step of producing a positive electrode and a negative electrode; a step of forming a group of electrodes by layering the positive electrode and the negative electrode on each other through a separator, or winding the positive electrode and the negative electrode through a separator; and a step of immersing the group of the electrodes in an electrolyte. The electrode-producing step has a boring step of forming a plurality of through-holes penetrating a power collection foil and having projected parts projected from at least a rear surface of the power collection foil.Type: GrantFiled: October 5, 2016Date of Patent: December 29, 2020Assignee: SEI CORPORATIONInventors: Takehiko Sawai, Shinji Saito, Kazunori Urao
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Patent number: 10873073Abstract: Provided is positive electrode material for a highly safe lithium-ion secondary battery that can charge and discharge a large current while having long service life. Disclosed are composite particles comprising: at least one carbon material selected from the group consisting of (i) fibrous carbon material, (ii) chain-like carbon material, and (iii) carbon material produced by linking together fibrous carbon material and chain-like carbon material; and lithium-containing phosphate, wherein at least one fine pore originating from the at least one carbon material opens to outside the composite particle. Preferably, the composite particles are coated with carbon. The fibrous carbon material is preferably a carbon nanotube with an average fiber size of 5 to 200 nm. The chain-like carbon material is preferably carbon black produced by linking, like a chain, primary particles with an average particle size of 10 to 100 nm.Type: GrantFiled: November 14, 2012Date of Patent: December 22, 2020Assignees: DENKA COMPANY LIMITED, SEI CORPORATIONInventors: Takashi Kawasaki, Nobuyuki Yoshino, Hiroshi Murata, Takehiko Sawai, Shinji Saito, Kazunori Urao
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Publication number: 20190362906Abstract: The present invention provides a lithium secondary battery for an ISS dischargeable at not less than 15 ItA when the temperature is ?30 degrees centigrade and chargeable at not less than 50 ItA. The present invention also provides an electrochemical device in which (1) a pressure of 0.3 kgf/cm2 to 1.Type: ApplicationFiled: January 11, 2017Publication date: November 28, 2019Inventors: Takehiko SAWAI, Shinji SAITO, Kazunori URAO
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Publication number: 20190288280Abstract: Provided is positive electrode material for a highly safe lithium-ion secondary battery that can charge and discharge a large current while having long service life. Disclosed are composite particles comprising: particles of lithium-containing phosphate; and carbon coating comprising at least one carbon material selected from the group consisting of (i) fibrous carbon material, (ii) chain-like carbon material, and (iii) carbon material produced by linking together fibrous carbon material and chain-like carbon material, wherein each particle is coated with the carbon coating. The fibrous carbon material is preferably a carbon nanotube with an average fiber size of 5 to 200 nm. The chain-like carbon material is preferably carbon black produced by linking, like a chain, primary particles with an average particle size of 10 to 100 nm. The lithium-containing phosphate is preferably LiFePO4, LiMnPO4, LiMnxFe(1-x)PO4, LiCoPO4, or Li3V2(PO4)3.Type: ApplicationFiled: June 3, 2019Publication date: September 19, 2019Applicant: DENKA COMPANY LIMITEDInventors: Takashi KAWASAKI, Nobuyuki YOSHINO, Hiroshi MURATA, Takehiko SAWAI, Shinji SAITO, Kazunori URAO
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Patent number: 10403893Abstract: A positive electrode material is used to produce a positive electrode of a lithium secondary battery, the positive electrode material being a composite lithium material that includes a first lithium compound and a second lithium compound. For instance, the first lithium compound is in the form of particles and comprises at least one compound selected from a layered lithium compound and a spinel-type lithium compound. Preferably, the second lithium compound comprises at least one compound selected from a lithium-containing phosphate compound and a lithium-containing silicate compound. An amorphous carbon material layer and/or graphene-structured carbon material layer is present on the entire surface of the first lithium compound and the second lithium compound. The second lithium compound forms a thin-film layer on part or the entirety of the carbon material layer present on the surface of the first lithium compound particles.Type: GrantFiled: August 21, 2014Date of Patent: September 3, 2019Assignees: HYDRO-QUEBEC, SEI CORPORATIONInventors: Takehiko Sawai, Shinji Saito, Kazunori Urao, Kazuma Hanai, Karim Zaghib, Abdelbast Guerfi, Martin Dontigny
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Patent number: 10230089Abstract: The present invention provides an electrolyte holder for a lithium secondary battery capable of holding an electrolytic solution inside electrodes or at an interface between the separator and each of the electrodes, preventing electrolyte shortage inside the electrodes, and restraining dendrite from precipitating and growing and also provide the lithium secondary battery, using the electrolyte holder, which is capable of achieving a cycle life to such an extent that the lithium secondary battery can be used for industrial application. An electrolyte holder (3) for use in the lithium secondary battery consists of a multi-layer structure having at least two hydrophilic fibrous layers (A, B) having different porosities. The electrolyte holder (3) is composed of an electrode group formed by winding a cathode (2) and an anode (1) or laminating the cathode (2) and the anode (1) one upon another with an electrolyte holder (3) serving as a separator interposed between the cathode (2) and the anode (1).Type: GrantFiled: March 19, 2012Date of Patent: March 12, 2019Assignees: SEI CORPORATION, NIPPON KODOSHI CORPORATIONInventors: Takehiko Sawai, Shinji Saito, Kazunori Urao, Jyunichi Ushimoto, Masahiko Ueta, Norihiro Wada
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Publication number: 20180287155Abstract: A positive-electrode material for a lithium secondary battery. The material includes a lithium oxide compound or a complex oxide as reactive substance. The material also includes at least one type of carbon material, and optionally a binder. A first type of carbon material is provided as a coating on the reactive substance particles surface. A second type of carbon material is carbon black. And a third type of carbon material is a fibrous carbon material provided as a mixture of at least two types of fibrous carbon material different in fiber diameter and/or fiber length. Also, a method for preparing the material as well as lithium secondary batteries including the material.Type: ApplicationFiled: June 5, 2018Publication date: October 4, 2018Applicants: Hydro-Quebec, SEI CorporationInventors: Karim ZAGHIB, Abdelbast GUERFI, Pierre HOVINGTON, Takehiko SAWAI, Shinji SAITO, Kazunori URAO
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Patent number: 10090525Abstract: A positive-electrode material for a lithium secondary battery. The material includes a lithium oxide compound or a complex oxide as reactive substance. The material also includes at least one type of carbon material, and optionally a binder. A first type of carbon material is provided as a coating on the reactive substance particles surface. A second type of carbon material is carbon black. And a third type of carbon material is a fibrous carbon material provided as a mixture of at least two types of fibrous carbon material different in fiber diameter and/or fiber length. Also, a method for preparing the material as well as lithium secondary batteries including the material.Type: GrantFiled: January 13, 2017Date of Patent: October 2, 2018Assignees: HYDRO-QUEBEC, SEI CORPORATIONInventors: Karim Zaghib, Abdelbast Guerfi, Pierre Hovington, Takehiko Sawai, Shinji Saito, Kazunori Urao
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Patent number: 10050270Abstract: A lithium-ion secondary battery including positive and negative electrodes, a separator element, an electrical conductor element and a binder, wherein the positive electrode includes a lithium-containing metal phosphate compound coated with a carbon material having at least one phase selected from a graphene phase and an amorphous phase, and further includes carbon black and a fibrous carbon material and wherein the negative-electrode material includes a graphite carbon material having at least one carbon phase selected from a graphene phase and an amorphous phase, and further includes carbon black and a fibrous carbon material, and wherein the binder includes a water-soluble synthetic resin or a water-dispersible synthetic resin. The most preferred positive electrode includes LiFePO4, The most preferred negative electrode includes artificial graphite or graphitazable powder. The most preferred binder is carboxyl methyl cellulose further including a surface active agent.Type: GrantFiled: May 6, 2013Date of Patent: August 14, 2018Assignee: HYDRO-QUEBECInventors: Karim Zaghib, Shinji Saito, Abdelbast Guerfi, Takehiko Sawai, Kazunori Urao, Jun Nakagawa, Francis Barray, Joël Fréchette
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Publication number: 20170324089Abstract: The present invention provides an electrode material, for a lithium battery, which is capable of achieving a high-energy density and a high output and continuing its properties for many years, a method of producing the electrode material, and the lithium battery. The electrode material for use in positive and negative electrodes of a lithium battery is formed as a complex by combining a carbon-based conductive material and an electrode active material with each other. The carbon-based conductive material of the electrode material is subjected to hydrophilic treatment by using a gas containing fluorine gas. The electrode material is formed as the complex by calcining a mixture of the carbon-based conductive material subjected to the hydrophilic treatment and the electrode active material in the presence of fluororesin.Type: ApplicationFiled: November 30, 2016Publication date: November 9, 2017Inventors: Takehiko SAWAI, Shinji SAITO, Kazunori URAO, Jun NAKAGAWA, Kazuma HANAI
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Publication number: 20170214098Abstract: The present invention provides a lithium secondary battery for an ISS which can be discharged at not less than 20 ItA when temperature is ?30 degrees centigrade and can be charged at not less than 50 ItA. The positive electrode material consists of a mixture of lithium-containing metal phosphate compound particles whose surfaces are coated with an amorphous carbon material and a conductive carbon material, in which atoms of the surface carbon materials are chemically bonded to one another. The negative electrode material contains at least one kind of particles selected from among graphite particles whose surfaces are coated with an amorphous carbon material, having a specific surface area of not less than 6 m2/g and soft carbon particles. A mixed electrolyte contains lithium hexafluorophosphate and lithium bis fluorosulfonyl imide.Type: ApplicationFiled: July 7, 2015Publication date: July 27, 2017Inventors: Takehiko SAWAI, Shinji SAITO, Kazunori URAO
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Publication number: 20170125813Abstract: A positive-electrode material for a lithium secondary battery. The material includes a lithium oxide compound or a complex oxide as reactive substance. The material also includes at least one type of carbon material, and optionally a binder. A first type of carbon material is provided as a coating on the reactive substance particles surface. A second type of carbon material is carbon black. And a third type of carbon material is a fibrous carbon material provided as a mixture of at least two types of fibrous carbon material different in fiber diameter and/or fiber length. Also, a method for preparing the material as well as lithium secondary batteries including the material.Type: ApplicationFiled: January 13, 2017Publication date: May 4, 2017Applicants: Hydro-Quebec, SEI CorporationInventors: Karim ZAGHIB, Abdelbast GUERFI, Pierre HOVINGTON, Takehiko SAWAI, Shinji SAITO, Kazunori URAO
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Publication number: 20170084920Abstract: The present invention provides an electrode material, for a lithium battery, which is capable of achieving a high-energy density and a high output and continuing its properties for many years, a method of producing the electrode material, and the lithium battery. The electrode material for use in positive and negative electrodes of a lithium battery is formed as a complex by combining a carbon-based conductive material and an electrode active material with each other. The carbon-based conductive material of the electrode material is subjected to hydrophilic treatment by using a gas containing fluorine gas. The electrode material is formed as the complex by calcining a mixture of the carbon-based conductive material subjected to the hydrophilic treatment and the electrode active material in the presence of fluororesin.Type: ApplicationFiled: November 30, 2016Publication date: March 23, 2017Inventors: Takehiko SAWAI, Shinji SAITO, Kazunori URAO, Jun NAKAGAWA, Kazuma HANAI
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Patent number: RE49319Abstract: A lithium-ion secondary battery including positive and negative electrodes, a separator element, an electrical conductor element and a binder, wherein the positive electrode includes a lithium-containing metal phosphate compound coated with a carbon material having at least one phase selected from a graphene phase and an amorphous phase, and further includes carbon black and a fibrous carbon material and wherein the negative-electrode material includes a graphite carbon material having at least one carbon phase selected from a graphene phase and an amorphous phase, and further includes carbon black and a fibrous carbon material, and wherein the binder includes a water-soluble synthetic resin or a water-dispersible synthetic resin. The most preferred positive electrode includes LiFePO4, The most preferred negative electrode includes artificial graphite or graphitazable powder. The most preferred binder is carboxyl methyl cellulose further including a surface active agent.Type: GrantFiled: March 3, 2020Date of Patent: November 29, 2022Assignee: HYDRO-QUEBECInventors: Karim Zaghib, Shinji Saito, Abdelbast Guerfi, Takehiko Sawai, Kazunori Urao, Jun Nakagawa, Francis Barray, Joel Frechette