Patents by Inventor Ryuta Morishima
Ryuta Morishima 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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Publication number: 20240097136Abstract: The present disclosure provides a negative electrode for use in a lithium-ion secondary battery capable of protecting the negative electrode from breakage and cracks due to expansion and contraction of an Si-based negative electrode active material. The negative electrode is for use in a lithium-ion secondary battery and includes a negative electrode current collector and a negative electrode active material layer formed on the negative electrode current collector. The negative electrode active material layer contains, as a negative electrode active material, an Si-based negative electrode active material including Si as a component and capable of reversibly absorbing and releasing lithium ions. The negative electrode further includes a high-molecular-weight organic compound for improving durability of the lithium-ion secondary battery. The high-molecular-weight organic compound has a weight-average molecular weight of 1000 or higher.Type: ApplicationFiled: January 27, 2022Publication date: March 21, 2024Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, KANSAI PAINT CO., LTD.Inventors: Akira KOHYAMA, Ryuta MORISHIMA, Daisaku ITO, Naoyuki IWATA
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Publication number: 20240097195Abstract: A nonaqueous electrolyte for use in a lithium-ion secondary battery, capable of reducing gas generation due to degradation of nonaqueous electrolyte, is provided. The nonaqueous electrolyte disclosed herein is for use in a lithium-ion secondary battery wherein a negative electrode active material in a negative electrode includes at least one of a Si-based negative electrode active material including Si as a component and capable of reversibly absorbing and releasing lithium ions or a graphite-based carbon negative electrode active material. The nonaqueous electrolyte contains a nonaqueous solvent and an electrolyte dissolved in the nonaqueous solvent, and further contains a cyclic carbonate and a high-molecular-weight organic compound having a weight-average molecular weight of 1000 or higher.Type: ApplicationFiled: January 27, 2022Publication date: March 21, 2024Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, KANSAI PAINT CO., LTD.Inventors: Akira KOHYAMA, Ryuta MORISHIMA, Daisaku ITO, Naoyuki IWATA
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Patent number: 11502342Abstract: (a) A battery including a power storage element and an electrolytic solution is assembled. (b) Initial charging is performed on the battery. (c) Alternate charging and discharging are performed on the battery after the initial charging. In the alternate charging and discharging, charging and discharging are alternately performed once or more respectively at a voltage between 4.0 V and 4.1 V and a current rate of 0.6 C or higher. The total number of times of charging and discharging is 3 or greater. The charging is performed such that the voltage changes by 0.05 V or higher and 0.1 V or lower whenever the charging is performed once. The discharging is performed such that the voltage changes by 0.05 V or higher and 0.1 V or lower whenever the discharging is performed once.Type: GrantFiled: September 30, 2020Date of Patent: November 15, 2022Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Ryuta Morishima
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Publication number: 20210175552Abstract: (a) A battery including a power storage element and an electrolytic solution is assembled. (b) Initial charging is performed on the battery. (c) Alternate charging and discharging are performed on the battery after the initial charging. In the alternate charging and discharging, charging and discharging are alternately performed once or more respectively at a voltage between 4.0 V and 4.1 V and a current rate of 0.6 C or higher. The total number of times of charging and discharging is 3 or greater. The charging is performed such that the voltage changes by 0.05 V or higher and 0.1 V or lower whenever the charging is performed once. The discharging is performed such that the voltage changes by 0.05 V or higher and 0.1 V or lower whenever the discharging is performed once.Type: ApplicationFiled: September 30, 2020Publication date: June 10, 2021Inventor: Ryuta MORISHIMA
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Patent number: 9825299Abstract: Provided is a nonaqueous electrolyte secondary cell in which heat generation is suppressed. The nonaqueous electrolyte secondary cell according to the invention has a positive electrode including positive electrode active material particles and a negative electrode including negative electrode active material particles. The negative electrode active material particles are carbon-black-adhered carbon-based negative electrode active material particles which are constituted by a carbon material having a graphite structure in at least part thereof and which have carbon black (CB) particles that have adhered to at least part of a surface portion. The positive electrode active material particles are of a hollow structure having a shell and a hollow portion.Type: GrantFiled: August 2, 2016Date of Patent: November 21, 2017Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Ryuta Morishima, Ryo Hanazaki, Nobuo Matsui
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Publication number: 20170040614Abstract: Provided is a nonaqueous electrolyte secondary cell in which heat generation is suppressed. The nonaqueous electrolyte secondary cell according to the invention has a positive electrode including positive electrode active material particles and a negative electrode including negative electrode active material particles. The negative electrode active material particles are carbon-black-adhered carbon-based negative electrode active material particles which are constituted by a carbon material having a graphite structure in at least part thereof and which have carbon black (CB) particles that have adhered to at least part of a surface portion. The positive electrode active material particles are of a hollow structure having a shell and a hollow portion.Type: ApplicationFiled: August 2, 2016Publication date: February 9, 2017Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Ryuta MORISHIMA, Ryo HANAZAKI, Nobuo MATSUI
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Patent number: 9397372Abstract: Provided is a sealed battery with improved safety and reliability in which no spark discharge or voltage recovery occurs after a current interrupt mechanism has been actuated. A sealed battery 10 includes a current interrupt mechanism 40: having an inversion plate 50 and a collector 60. The collector 60 and the inversion plate 50 are electrically and mechanically joined in the easily breakable section 61 and the inversion section 51, the easily breakable section 61 is broken and displaced together with the inversion section 51 by the displacement of the inversion section 51, and the electric connection of the collector 60 and the inversion plate 50 is interrupted. The distance between the collector 60 and the easily breakable section 61 after the displacement is within a range of 0.3 mm to 1.5 mm.Type: GrantFiled: January 25, 2013Date of Patent: July 19, 2016Assignees: Toyota Jidosha Kabushiki Kaisha, Sanyo Electric Co., Ltd.Inventors: Takuichi Arai, Toshihiro Takada, Hiroshi Inukai, Hironori Harada, Akira Kiyama, Ryuta Morishima, Naoya Nakanishi, Yasuhiro Yamauchi, Yoshinori Yokoyama
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Patent number: 9083056Abstract: A method is provided for manufacturing an electrode that has a porous inorganic layer on the surface of an active material layer and is suitable for constructing a nonaqueous secondary battery with excellent input-output performance. In this manufacturing method, an electrode perform, which has an active material layer (344) consisting primarily of active material particles (42) and supported on a collector (342), is prepared. The water concentration of at least the surface (344a) of the active material layer (344) is adjusted to 100 ppm to 500 ppm. A slurry (S) containing inorganic particles (44), a binder and an organic solvent is coated on the surface (344a) of the active material layer with the water concentration thus adjusted, to form a porous inorganic layer.Type: GrantFiled: December 11, 2009Date of Patent: July 14, 2015Assignee: Toyota Jidosha Kabushiki KaishaInventors: Ryuta Morishima, Hitoshi Sakai, Hiroaki Ikeda, Hiroyuki Akita, Hidehito Matsuo
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Patent number: 8980469Abstract: A high-reliability prismatic secondary battery with a current interruption mechanism that is unlikely to be damaged even if the battery is subjected to shock is provided. The prismatic secondary battery includes a second insulating member having a first through-hole, the second insulating member being arranged between a first region of a positive electrode collector and an inversion plate. The first region of the positive electrode collector and the inversion plate are electrically connected to each other through the first through-hole. The second insulating member has a plurality of fixing pawl portions. The fixing pawl portions are hooked and fixed to a fixing portion formed on the outer surface side of the conductive member.Type: GrantFiled: January 25, 2013Date of Patent: March 17, 2015Assignees: SANYO Electric Co., Ltd., Toyota Jidosha Kabushiki KaishaInventors: Eiji Okutani, Yoshinori Yokoyama, Yasuhiro Yamauchi, Toshiyuki Nohma, Hironori Harada, Toshihiro Takada, Hiroshi Inukai, Akira Kiyama, Ryuta Morishima
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Patent number: 8753769Abstract: Disclosed is a method for manufacturing a secondary battery (10) containing a nonaqueous electrolyte solution. This method comprises a step (S110) for preparing an electrode assembly (20) having positive and negative electrode sheets (30, 40), a step (S120) for immersing the electrode assembly (20) into a nonaqueous liquid (60), and a step (S130, S140) for placing the electrode assembly (20) after immersion into a battery container (11) together with a nonaqueous electrolyte solution (70). By performing the immersion process, the water content in the electrode assembly (20) moves into the nonaqueous liquid (60).Type: GrantFiled: September 22, 2008Date of Patent: June 17, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventor: Ryuta Morishima
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Patent number: 8658305Abstract: The lithium-ion battery provided by the present invention has an electrode assembly (30) obtained by superposing and winding together a long continuous positive electrode sheet (32) and negative electrode sheet (34) with a separator (35) interposed therebetween. An active material layer (344) is formed on the negative electrode sheet (34), with a band-shaped margin being left on one edge thereof along the lengthwise direction of the collector (342). The above band-shaped portion (342a) sticks out beyond the edge of the positive electrode sheet (32). On the exterior surface of the negative active material layer (344), a porous inorganic layer (346) is formed starting at the flat part (344a) of the active material layer, wrapping around the edge (344b) thereof, and extending to the surface of the collector (342). The porosity Pa at the edge (344b) of the inorganic layer (346) is less than the porosity Pb at the flat part (344a) thereof.Type: GrantFiled: April 10, 2009Date of Patent: February 25, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventor: Ryuta Morishima
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Publication number: 20130230748Abstract: A method for manufacturing a nonaqueous electrolyte secondary battery including a current interruption mechanism that interrupts electric current includes disposing, in the outer body, an electrode assembly and a nonaqueous electrolyte containing a compound having at least one of a cyclohexyl group and a phenyl group, adjusting the nonaqueous electrolyte to contain the compound having at least one of a cyclohexyl group and a phenyl group in an amount of from 2.5 g/m2 to 5.0 g/m2 with respect to a formation area of a positive electrode active material layer on a positive electrode substrate surface, and thereafter performing aging treatment at 60° C. or more at a state of charge of 60% or more. This battery exhibits excellent output characteristics in a low temperature condition and can sufficiently ensure reliability even when the battery is overcharged through two-step charging in a low temperature condition.Type: ApplicationFiled: January 25, 2013Publication date: September 5, 2013Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, SANYO ELECTRIC CO., LTD.Inventors: Keisuke Minami, Masahiro Iyori, Yoshinori Yokoyama, Toyoki Fujihara, Yasuhiro Yamauchi, Toshiyuki Nohma, Hironori Harada, Toshihiro Takada, Ryuta Morishima
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Publication number: 20120021264Abstract: The lithium-ion battery provided by the present invention has an electrode assembly (30) obtained by superposing and winding together a long continuous positive electrode sheet (32) and negative electrode sheet (34) with a separator (35) interposed therebetween. An active material layer (344) is formed on the negative electrode sheet (34), with a band-shaped margin being left on one edge thereof along the lengthwise direction of the collector (342). The above band-shaped portion (342a) sticks out beyond the edge of the positive electrode sheet (32). On the exterior surface of the negative active material layer (344), a porous inorganic layer (346) is formed starting at the flat part (344a) of the active material layer, wrapping around the edge (344b) thereof, and extending to the surface of the collector (342). The porosity Pa at the edge (344b) of the inorganic layer (346) is less than the porosity Pb at the flat part (344a) thereof.Type: ApplicationFiled: April 10, 2009Publication date: January 26, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Ryuta Morishima
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Publication number: 20110281161Abstract: The lithium secondary battery provided by the present invention includes an electrode provided with an insulating particle-containing layer (34) having a configuration in which an active material layer (344) is retained on a current collector (342), and an insulating particle-containing layer (346), containing insulating particles (44) and a binder (46), is provided on the active material layer (344). A portion (346A) of the insulating particle-containing layer (346) facing the active material layer contains the binder (46) at a higher weight content than a portion (346B) facing an outer surface thereof.Type: ApplicationFiled: February 9, 2009Publication date: November 17, 2011Inventors: Hiroaki Ikeda, Hitoshi Sakai, Ryuta Morishima, Hiroyuki Akita, Hidehito Matsuo
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Publication number: 20110239446Abstract: A method is provided for manufacturing an electrode that has a porous inorganic layer on the surface of an active material layer and is suitable for constructing a nonaqueous secondary battery with excellent input-output performance. In this manufacturing method, an electrode perform, which has an active material layer (344) consisting primarily of active material particles (42) and supported on a collector (342), is prepared. The water concentration of at least the surface (344a) of the active material layer (344) is adjusted to 100 ppm to 500 ppm. A slurry (S) containing inorganic particles (44), a binder and an organic solvent is coated on the surface (344a) of the active material layer with the water concentration thus adjusted, to form a porous inorganic layer.Type: ApplicationFiled: December 11, 2009Publication date: October 6, 2011Inventors: Ryuta Morishima, Hitoshi Sakai, Hiroaki Ikeda, Hiroyuki Akita, Hidehito Matsuo
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Publication number: 20100216019Abstract: Disclosed is a method for manufacturing a secondary battery (10) containing a nonaqueous electrolyte solution. This method comprises a step (S110) for preparing an electrode assembly (20) having positive and negative electrode sheets (30, 40), a step (S120) for immersing the electrode assembly (20) into a nonaqueous liquid (60), and a step (S130, S140) for placing the electrode assembly (20) after immersion into a battery container (11) together with a nonaqueous electrolyte solution (70). By performing the immersion process, the water content in the electrode assembly (20) moves into the nonaqueous liquid (60).Type: ApplicationFiled: September 22, 2008Publication date: August 26, 2010Inventor: Ryuta Morishima
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Publication number: 20100112439Abstract: At least one organic molecular chain is strongly bonded to a surface of active material. By using a treated active material in which at least one organic molecular chain is strongly bonded to a surface of active material, it is possible to maintain a charge-discharge characteristic of a secondary battery or the like at a good level over a long period. A treated material 1 is obtained by chemically adsorbing organic molecular chains 5 onto a surface of active material 3. A bonding force between the active mass 3 and organic molecular chains 5 is 40-400 kJ/mol. In a case where the bonding force between the active material 3 and organic molecular chains 5 is 40-400 kJ/mol, when the treated active material 1 is used as an electrode active material of a secondary battery or the like, the charge-discharge characteristic of the secondary battery can be maintained at a good level over a long period.Type: ApplicationFiled: March 21, 2008Publication date: May 6, 2010Inventors: Ryuta Morishima, Akira Kuroda