Patents by Inventor Keisuke Ohara
Keisuke Ohara 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: 11817577Abstract: The present disclosure relates to a secondary battery module including a nonaqueous electrolyte secondary battery and an elastic body. The elastic body has a compressive elastic modulus of 5 MPa to 120 MPa. The nonaqueous electrolyte secondary battery includes a positive electrode and a negative electrode. The positive electrode includes a positive electrode collector containing Ti as a main component and having a thickness of 1 ?m to 8 ?m. The negative electrode includes a first layer and a second layer sequentially formed from a side with the negative electrode collector. The first layer contains negative electrode active material particles containing first carbon-based active material particles with a 10% proof stress of 3 MPa or less. The second layer contains negative electrode active material particles containing second carbon-based active material particles with a 10% proof stress of 5 MPa or greater.Type: GrantFiled: March 12, 2021Date of Patent: November 14, 2023Assignees: PANASONIC HOLDINGS CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yasunori Baba, Harunari Shimamura, Keisuke Ohara, Kohei Masai, Kouhei Tsuzuki, Katsunori Yanagida, Yo Kato
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Publication number: 20230071451Abstract: This positive electrode for nonaqueous electrolyte secondary batteries is provided with a positive electrode core body and a positive electrode mixture layer formed on the surface of the positive electrode core body. The positive electrode mixture layer contains a positive electrode active material mainly composed of a lithium transition metal composite oxide which contains 70% by mole or more of Ni relative to the total number of moles of the metal elements excluding Li. The positive electrode core body has a thermal conductivity X of from 50 to 155 W/m·K (25° C.). The upper limit Y1 and the lower limit Y2 of the median value Y in the circularity distribution of the lithium transition metal composite oxide relative to the thermal conductivity X of the core body respectively satisfy the conditions of formula (1) and formula (2) described below. Formula (1): Y1=0.9322(X?0.987) Formula (2): Y2=0.1613(X?0.746)?0.0005.Type: ApplicationFiled: January 18, 2021Publication date: March 9, 2023Applicant: Panasonic Holdings CorporationInventors: Harunari Shimamura, Keisuke Ohara, Yusuke Fukumoto
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Publication number: 20230061490Abstract: This secondary cell module comprises anon-aqueous electrolyte secondary cell with: an electrode body in which a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode are layered; and a housing that accommodates the electrode body. The compression modulus of elasticity of the elastic body is in the range 5-120 MPa, and the positive electrode is provided with: a positive electrode current collector that contains titanium as a principal constituent and has a thickness of 1-8 ?m; and a positive electrode active material layer that is disposed on the positive electrode current collector and that includes a complex oxide containing lithium nickel, the proportion of nickel to the total quantity of metal elements other than lithium being in the range 70-100 mol %.Type: ApplicationFiled: January 18, 2021Publication date: March 2, 2023Applicant: PANASONIC HOLDINGS CORPORATIONInventors: Yasunori Baba, Kouhei Tsuzuki, Harunari Shimamura, Keisuke Ohara, Katsunori Yanagida
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Publication number: 20220352552Abstract: The present disclosure relates to an electrolyte solution for a non-aqueous electrolyte secondary battery comprising a silane compound having two or more trialkoxysilyl groups. By the present disclosure, an electrolyte solution for a non-aqueous electrolyte secondary battery capable of inhibiting degradation of a negative electrode in the non-aqueous electrolyte secondary battery is provided.Type: ApplicationFiled: April 20, 2022Publication date: November 3, 2022Inventors: Akihiko TAKADA, Keisuke OHARA
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Publication number: 20220255065Abstract: A non-aqueous electrolyte secondary battery comprises a positive electrode, a negative electrode, and an electrolyte solution. The positive electrode includes a positive electrode substrate and a positive electrode active material layer. The positive electrode active material layer includes a first layer and a second layer. The second layer is interposed between the positive electrode substrate and the first layer. The first layer includes a first positive electrode active material. The second layer includes a second positive electrode active material. The first positive electrode active material has a first particle size distribution based on volume. The first particle size distribution is unimodal. In the first particle size distribution, a ratio of D10 to D90 is from 0.18 to 0.52. The second positive electrode active material has a second particle size distribution based on volume. The second particle size distribution is multimodal.Type: ApplicationFiled: February 1, 2022Publication date: August 11, 2022Inventors: Shinya SUZUKI, Keisuke OHARA, Ryo HANAZAKI
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Publication number: 20220013761Abstract: This nonaqueous electrolyte secondary battery positive electrode comprises a positive electrode collector which is mainly composed of Ti, and a positive electrode active material layer which is disposed on the positive electrode collector, wherein the positive electrode active material layer includes a positive electrode active material and a binder and has a density of 3 g/cc or more, the positive electrode active material has an average particle size in a range of 2 to 20 ?m, the positive electrode collector has a thickness in a range of 1 to 8 ?m, and the content of the binder in the positive electrode active material layer satisfies the formula, y=0.006x2+0.0262x+a (y is the content (mass %) of the binder, x is the thickness of the positive electrode collector, and a is a real number from 0.3 to 2.2).Type: ApplicationFiled: September 27, 2019Publication date: January 13, 2022Applicant: Panasonic CorporationInventors: Harunari Shimamura, Keisuke Ohara, Yusuke Fukumoto
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Patent number: 11133525Abstract: A lithium-ion secondary battery includes at least a negative electrode, a positive electrode, and an electrolyte solution. The negative electrode includes at least negative electrode active material particles. Each of the negative electrode active material particles contains at least a SiOx particle and a Si layer. The Si layer covers a surface of the SiOx particle. The Si layer has a thickness not smaller than 10 nm and not greater than 100 nm. The electrolyte solution contains at least one selected from the group consisting of FEC and VC.Type: GrantFiled: April 8, 2019Date of Patent: September 28, 2021Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Ryosuke Ohsawa, Keisuke Ohara, Akihiro Taniguchi, Kaoru Inoue
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Publication number: 20210296639Abstract: The present disclosure relates to a secondary battery module including a nonaqueous electrolyte secondary battery and an elastic body. The elastic body has a compressive elastic modulus of 5 MPa to 120 MPa. The nonaqueous electrolyte secondary battery includes a positive electrode and a negative electrode. The positive electrode includes a positive electrode collector containing Ti as a main component and having a thickness of 1 ?m to 8 ?m. The negative electrode includes a first layer and a second layer sequentially formed from a side with the negative electrode collector. The first layer contains negative electrode active material particles containing first carbon-based active material particles with a 10% proof stress of 3 MPa or less. The second layer contains negative electrode active material particles containing second carbon-based active material particles with a 10% proof stress of 5 MPa or greater.Type: ApplicationFiled: March 12, 2021Publication date: September 23, 2021Applicants: Panasonic Corporation, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yasunori Baba, Harunari Shimamura, Keisuke Ohara, Kohei Masai, Kouhei Tsuzuki, Katsunori Yanagida, Yo Kato
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Patent number: 11011753Abstract: A lithium-ion secondary battery includes at least a negative electrode, a positive electrode, and an electrolyte. The negative electrode includes at least a negative electrode active material and a polymer binder. The negative electrode active material includes at least a graphitic material and a silicon oxide material. The amount of acidic functional groups per unit surface area of graphitic material is not lower than 0.017 mmol/m2 and not higher than 0.086 mmol/m2. A polymer binder contains a carboxy group. Polymer binder has a main chain with a length not smaller than 0.53 ?m and not greater than 2.13 ?m.Type: GrantFiled: February 21, 2019Date of Patent: May 18, 2021Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Ryosuke Ohsawa, Keisuke Ohara, Akihiro Taniguchi, Kaoru Inoue
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Patent number: 11011738Abstract: Provided is a method for producing a negative electrode by using a negative electrode active material and ceramic particles, the method ensuring satisfactory coatability of the paste and high peel strength and hardness of the obtained negative electrode active material layer. The method for producing a negative electrode disclosed herein includes a step of coating a negative electrode paste including a negative electrode active material and ceramic particles on a negative electrode current collector; a step of drying the coated negative electrode paste to form a negative electrode active material layer; and a step of pressing the negative electrode active material layer. The ceramic particles have an aspect ratio of 1.5 or more and 20 or less. The ceramic particles have a short side length of ? or less of an average particle diameter of the negative electrode active material.Type: GrantFiled: October 12, 2017Date of Patent: May 18, 2021Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kazuhisa Takeda, Yuji Yokoyama, Keisuke Ohara
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Patent number: 10944098Abstract: A negative electrode active material particle includes natural graphite and a coating. The surface of the natural graphite is coated with the coating. The coating contains low crystalline carbon and fluorine. The low crystalline carbon has lower crystallinity than the natural graphite and a structure in which carbon hexagonal net planes are layered in a portion of the low crystalline carbon. The peak of CF2 bonds is detected by X-ray photoelectron spectroscopy of the negative electrode active material particle, and the fluorine concentration of the surface of the negative electrode active material particle is 10 atm % or more and 20 atm % or less.Type: GrantFiled: April 19, 2018Date of Patent: March 9, 2021Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kazuhisa Takeda, Keisuke Ohara
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Patent number: 10938025Abstract: Negative electrode active material particles for a lithium ion secondary battery include base material particles and a coating. The coating covers a surface of the base material particles. The base material particles contain a first carbon material. The coating contains lithium titanate and a second carbon material. When a ratio of an intensity of a D band to an intensity of a G band in a laser Raman spectrum is set as an R value, the second carbon material has a larger R value than the first carbon material.Type: GrantFiled: April 23, 2018Date of Patent: March 2, 2021Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kazuhisa Takeda, Keisuke Ohara
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Patent number: 10622619Abstract: The negative electrode plate includes at least a negative electrode composite material layer. The negative electrode composite material layer has a density of 1.5 g/cm3 or more. The negative electrode composite material layer contains at least first particles, second particles and a binder. The first particles contain graphite particles and an amorphous carbon material. The amorphous carbon material is coated on the surface of each graphite particle. The second particles are made of silicon oxide. The ratio of the second particles to the total amount of the first particles and the second particles is 2 mass % or more to 10 mass % or less. The negative electrode plate has a spring constant of 700 kN/mm or more to 3000 kN/mm or less.Type: GrantFiled: October 11, 2018Date of Patent: April 14, 2020Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Akira Tsujiko, Ryosuke Ohsawa, Kaoru Inoue, Akihiro Taniguchi, Keisuke Ohara
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Patent number: 10581049Abstract: A nonaqueous electrolyte secondary battery (100) includes a positive electrode (30), a negative electrode (40), a separator (50), a nonaqueous electrolytic solution, and a battery case (10). The positive electrode includes a positive electrode current collector (32) and a positive electrode active material layer (34). The separator includes a separator substrate (52) and a heat resistance layer (54). The separator substrate has an opposite surface opposite the positive electrode active material layer. The heat resistance layer constitutes at least a part of the opposite surface and contains a heat-resistant filler and a binder. The positive electrode active material layer has an adjacent region (X). The heat resistance layer has an opposite region (Y) opposite at least an end portion of the adjacent region. The end portion of the adjacent region is adjacent to a positive electrode current collector exposure portion (33). The opposite region contains at least a calcium salt of carboxymethyl cellulose.Type: GrantFiled: April 15, 2015Date of Patent: March 3, 2020Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hideyuki Saka, Tatsuya Hashimoto, Yusuke Fukumoto, Keisuke Ohara, Kouichi Toriyama
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Patent number: 10454098Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, a separator provided between the positive electrode and the negative electrode, and a nonaqueous electrolytic solution at least held by the separator. The positive electrode has a positive electrode collector and a positive electrode mixture layer provided on the positive electrode collector. The positive electrode mixture layer has a first powder and a second powder. The first powder includes a first positive electrode active material, a first conductive material, and an organic-based binder. The second powder includes a second positive electrode active material, a second conductive material, and a water-based binder.Type: GrantFiled: May 29, 2015Date of Patent: October 22, 2019Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroya Umeyama, Tatsuya Hashimoto, Keisuke Ohara, Yusuke Fukumoto, Yuji Yokoyama
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Publication number: 20190312302Abstract: A lithium-ion secondary battery includes at least a negative electrode, a positive electrode, and an electrolyte solution. The negative electrode includes at least negative electrode active material particles. Each of the negative electrode active material particles contains at least a SiOx particle and a Si layer. The Si layer covers a surface of the SiOx particle. The Si layer has a thickness not smaller than 10 nm and not greater than 100 nm. The electrolyte solution contains at least one selected from the group consisting of FEC and VC.Type: ApplicationFiled: April 8, 2019Publication date: October 10, 2019Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Ryosuke OHSAWA, Keisuke OHARA, Akihiro TANIGUCHI, Kaoru INOUE
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Patent number: 10411265Abstract: A lithium ion secondary battery includes a negative electrode, a positive electrode, and a non-aqueous electrolyte solution. The non-aqueous electrolyte solution includes a lithium salt and an aprotic solvent. The negative electrode includes a composite particle. The composite particle includes a negative electrode active material and tungsten trioxide. The negative electrode active material contains graphite. The tungsten trioxide is disposed on a surface of the negative electrode active material.Type: GrantFiled: July 31, 2017Date of Patent: September 10, 2019Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kazuhisa Takeda, Keisuke Ohara
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Publication number: 20190260030Abstract: A lithium-ion secondary battery includes at least a negative electrode, a positive electrode, and an electrolyte. The negative electrode includes at least a negative electrode active material and a polymer binder. The negative electrode active material includes at least a graphitic material and a silicon oxide material. The amount of acidic functional groups per unit surface area of graphitic material is not lower than 0.017 mmol/m2 and not higher than 0.086 mmol/m2. A polymer binder contains a carboxy group. Polymer binder has a main chain with a length not smaller than 0.53 ?m and not greater than 2.13 ?m.Type: ApplicationFiled: February 21, 2019Publication date: August 22, 2019Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Ryosuke OHSAWA, Keisuke OHARA, Akihiro TANIGUCHI, Kaoru INOUE
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Publication number: 20190115585Abstract: The negative electrode plate includes at least a negative electrode composite material layer. The negative electrode composite material layer has a density of 1.5 g/cm3 or more. The negative electrode composite material layer contains at least first particles, second particles and a binder. The first particles contain graphite particles and an amorphous carbon material. The amorphous carbon material is coated on the surface of each graphite particle. The second particles are made of silicon oxide. The ratio of the second particles to the total amount of the first particles and the second particles is 2 mass % or more to 10 mass % or less. The negative electrode plate has a spring constant of 700 kN/mm or more to 3000 kN/mm or less.Type: ApplicationFiled: October 11, 2018Publication date: April 18, 2019Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Akira TSUJIKO, Ryosuke OHSAWA, Kaoru INOUE, Akihiro TANIGUCHI, Keisuke OHARA
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Publication number: 20180315998Abstract: A negative electrode active material particle includes natural graphite and a coating. The surface of the natural graphite is coated with the coating. The coating contains low crystalline carbon and fluorine. The low crystalline carbon has lower crystallinity than the natural graphite and a structure in which carbon hexagonal net planes are layered in a portion of the low crystalline carbon. The peak of CF2 bonds is detected by X-ray photoelectron spectroscopy of the negative electrode active material particle, and the fluorine concentration of the surface of the negative electrode active material particle is 10 atm % or more and 20 atm % or less.Type: ApplicationFiled: April 19, 2018Publication date: November 1, 2018Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kazuhisa TAKEDA, Keisuke OHARA