Patents by Inventor Naoto ONODERA
Naoto ONODERA 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: 11888128Abstract: Provided is a technique for suppressing the formation of black regions in a wound electrode body. The production method disclosed herein is a method for producing a non-aqueous electrolyte secondary battery that includes a wound electrode body, a non-aqueous electrolyte, and a battery case. This production method includes the following steps: an assembling step S1 of placing the wound electrode body and the non-aqueous electrolyte in the battery case to construct a secondary battery assembly; a first step S2 of performing initial charging on the secondary battery assembly; and a second step S3 of setting the temperature of the wound electrode body to 50° C. or lower and keeping this state for at least 72 hours after the first step.Type: GrantFiled: March 10, 2022Date of Patent: January 30, 2024Assignee: Prime Planet Energy & Solutions, Inc.Inventors: Akira Kohyama, Hideki Sano, Naoto Onodera, Azusa Nakanishi
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Publication number: 20230387387Abstract: A method of producing a negative electrode composite material slurry for a non-aqueous electrolyte secondary battery comprises a first step to obtain a first mixed-kneaded body, and a second step to use the first mixed-kneaded body to obtain the negative electrode composite material slurry. The first step includes a step to mix and knead a negative electrode active material including a carbon-based active material and a Si-based active material, carboxymethylcellulose, polyacrylic acid, and water. The second step includes a step (x1) to mix and knead the first mixed-kneaded body, carboxymethylcellulose, and water. A solid content of the first mixed-kneaded body is from (a-3)% to a%, and a solid content of the negative electrode composite material slurry is from (a-15)% to (a-10)%. “a” refers to the solid content [%] defined in the specification.Type: ApplicationFiled: May 19, 2023Publication date: November 30, 2023Inventors: Hideki SANO, Kouhei TSUZUKI, Naoto ONODERA, Yuki MORIKAWA, Yurika KOJIMA
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Publication number: 20230387410Abstract: The herein disclosed negative electrode is a negative electrode for a nonaqueous electrolyte secondary battery that includes a current collector, and a negative electrode active material layer disposed on a single surface or both surfaces of the current collector. The negative electrode active material layer includes a negative electrode active material and a binder. A graphite particle and a Si-containing particle are included as the negative electrode active material. A carboxymethyl cellulose (CMC), a poly acrylic acid (PAA), and a styrene butadiene rubber (SBR) are included as the binder. A spring constant in a thickness direction of the negative electrode is equal to or more than 70 kN/mm and not more than 400 kN/mm, and a yield loop height on a stiffness test is equal to or less than 13 mm.Type: ApplicationFiled: May 16, 2023Publication date: November 30, 2023Inventors: Yurika KOJIMA, Yuki MORIKAWA, Naoto ONODERA, Kouhei TSUZUKI, Hideki SANO
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Publication number: 20230387386Abstract: The herein disclosed negative electrode is a negative electrode for a nonaqueous electrolyte secondary battery that includes a current collector, and a negative electrode active material layer disposed on the current collector. The negative electrode active material layer includes a negative electrode active material and a binder, and a graphite particle and a Si-containing particle are included as the negative electrode active material. An average 10% yield strength of the graphite particle is equal to or less than 12 MPa. A BET specific surface area of the graphite particle is equal to or more than 0.5 m2/g and not more than 3.5 m2/g. A spring constant in a thickness direction of the negative electrode is equal to or less than 200 kN/mm. A 90° peel strength between the current collector and the negative electrode active material layer is equal to or more than 1.5 N/m.Type: ApplicationFiled: May 16, 2023Publication date: November 30, 2023Inventors: Yuki MORIKAWA, Yurika KOJIMA, Naoto ONODERA, Kouhei TSUZUKI, Hideki SANO
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Publication number: 20230327110Abstract: A non-aqueous electrolyte secondary battery includes a negative electrode active material layer including a negative electrode active material. The negative electrode active material includes first graphite particles, second graphite particles each having a compressive elastic modulus more than a compressive elastic modulus of each of the first graphite particles, and Si-containing particles. A contact length Lt1 between a first graphite particle and a Si-containing particle is equal to or more than a contact length Lt2 between a second graphite particle and the Si-containing particle.Type: ApplicationFiled: April 7, 2023Publication date: October 12, 2023Inventors: Naoto ONODERA, Hideki SANO, Kouhei TSUZUKI, Yuki MORIKAWA, Yurika KOJIMA
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Publication number: 20230327081Abstract: The present disclosure relates to a negative electrode for a non-aqueous electrolyte secondary battery, wherein each of first silicon-containing particles and second silicon-containing particles contains a carbon domain and a silicon domain dispersed in the carbon domain and having a nano size, each of a first binder and a second binder contains carboxymethyl cellulose (CMC), and a content ratio of the carboxymethyl cellulose in a second active material layer is more than a content ratio of the carboxymethyl cellulose in a first active material layer.Type: ApplicationFiled: April 6, 2023Publication date: October 12, 2023Inventors: Kouhei TSUZUKI, Naoto ONODERA, Hideki SANO, Yuki MORIKAWA, Yurika KOJIMA
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Publication number: 20230327080Abstract: The present disclosure relates to a negative electrode for a non-aqueous electrolyte secondary battery, the negative electrode comprising an active material layer, wherein the active material layer contains graphite particles, fibrous carbon, silicon-containing particles, and a binder, a BET specific surface area of the graphite particles is 3.5 m2/g or less, the fibrous carbon includes a carbon nanotube, each of the silicon-containing particles includes a domain composed of carbon and a domain composed of silicon and having a size of 50 nm or less, and an oxygen content ratio in each of the silicon-containing particles is 7 wt % or less. According to the present disclosure, a negative electrode and a non-aqueous electrolyte secondary battery are provided to suppress decrease in initial capacity and cycling performance.Type: ApplicationFiled: March 24, 2023Publication date: October 12, 2023Applicant: PRIME PLANET ENERGY & SOLUTIONS, INC.Inventors: Kouhei TSUZUKI, Naoto ONODERA, Hideki SANO, Yuki MORIKAWA, Yurika KOJIMA
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Patent number: 11626593Abstract: This negative electrode comprises an electrode current collector, and an electrode mixture layer provided on a surface of the electrode current collector. When, with respect to the thickness direction of the electrode mixture layer, a range from the surface on the side of the electrode current collector to 40% of the thickness of the electrode mixture layer is defined as a first region, and a range from the surface on the side opposite to the electrode current collector to 40% of the thickness of the electrode mixture layer is defined as a second region, the first region and the second region have different volume change ratio upon charge and discharge, and the region having the larger volume change ratio upon charge and discharge has a higher content of a solid inorganic filler and a lower content of a hollow inorganic filler than the region having the smaller volume change ratio.Type: GrantFiled: December 17, 2020Date of Patent: April 11, 2023Assignees: PANASONIC HOLDINGS CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Naoto Onodera, Katsunori Yanagida, Yo Kato
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Patent number: 11539048Abstract: A negative electrode includes at least a negative electrode composite material layer. The negative electrode composite material layer contains at least composite particles and a binder. Each composite particle includes a negative electrode active material particle and a film. The film covers at least part of a surface of the negative electrode active material particle. The film contains a layered silicate mineral. The binder includes nanofibers.Type: GrantFiled: September 30, 2019Date of Patent: December 27, 2022Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yutaka Oyama, Naoto Onodera
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Publication number: 20220393252Abstract: A technique for suppressing formation of a black region in a wound electrode body is provided. A method for fabricating a nonaqueous electrolyte secondary battery disclosed here includes: an assembly step of constructing a secondary battery assembly including a wound electrode body; and an initial charging step of performing initial charging on the secondary battery assembly. In the initial charging step, the secondary battery assembly is charged at a first charging rate until a negative electrode potential with respect to a lithium metal reference (vs. Li/Li+) of the secondary battery assembly reaches at least 0.5 V, and a remaining gas amount of the wound electrode body at the end of the initial charging step is 58 cc or less.Type: ApplicationFiled: May 27, 2022Publication date: December 8, 2022Inventors: Naoto ONODERA, Hideki SANO, Daisuke NISHIDE
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Publication number: 20220320593Abstract: Provided is a technique for suppressing the formation of highly resistive regions in a wound electrode body. The production method disclosed herein includes a flat-shaped wound electrode body in which a belt-shaped positive electrode plate and a belt-shaped negative electrode plate are wound, with a belt-shaped separator being intervened therebetween, a non-aqueous electrolyte, and a battery case. The positive electrode plate contains a lithium-transition metal composite oxide containing manganese. This production method includes an assembling step S1 of placing the wound electrode body and the non-aqueous electrolyte in the battery case to construct a secondary battery assembly; a first charging step S2 of performing initial charging on the secondary battery assembly such that the battery voltage reaches 3.1 V to 3.7 V; and a discharging step S3 of discharging the secondary battery assembly after the first charging step.Type: ApplicationFiled: March 23, 2022Publication date: October 6, 2022Inventors: Akira KOHYAMA, Hideki SANO, Naoto ONODERA, Azusa NAKANISHI
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Publication number: 20220320610Abstract: Provided is a technique for suppressing the formation of black regions in a wound electrode body. The production method disclosed herein is a method for producing a non-aqueous electrolyte secondary battery that includes a wound electrode body, a non-aqueous electrolyte, and a battery case. This production method includes the following steps: an assembling step S1 of placing the wound electrode body and the non-aqueous electrolyte in the battery case to construct a secondary battery assembly; a first step S2 of performing initial charging on the secondary battery assembly; and a second step S3 of setting the temperature of the wound electrode body to 50° C. or lower and keeping this state for at least 72 hours after the first step.Type: ApplicationFiled: March 10, 2022Publication date: October 6, 2022Applicant: PRIME PLANET ENERGY & SOLUTIONS, INC.Inventors: Akira KOHYAMA, Hideki SANO, Naoto ONODERA, Azusa NAKANISHI
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Publication number: 20220320594Abstract: Provided is a technique for preventing plastic deformation of a battery case due to restraint during initial charging. A manufacturing method disclosed herein is a manufacturing method of a non-aqueous electrolyte solution secondary battery. This method includes assembling to construct a secondary battery assembly, and initial charging of the secondary battery assembly. In the initial charging, the initial charging is started with the secondary battery assembly restrained or not restrained; when a negative electrode potential of the secondary battery assembly reaches 0.6 V, a restraint force P1 is applied to the secondary battery assembly, wherein the restraint force P1 is greater than a restraint force applied before the negative electrode potential reaches 0.6 V; and the restraint force P1 is applied to the secondary battery assembly until the negative electrode potential reaches at least 0.3 V.Type: ApplicationFiled: March 23, 2022Publication date: October 6, 2022Inventors: Daisuke NISHIDE, Azusa NAKANISHI, Hideki SANO, Naoto ONODERA
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Publication number: 20210194009Abstract: This negative electrode comprises an electrode current collector, and an electrode mixture layer provided on a surface of the electrode current collector. When, with respect to the thickness direction of the electrode mixture layer, a range from the surface on the side of the electrode current collector to 40% of the thickness of the electrode mixture layer is defined as a first region, and a range from the surface on the side opposite to the electrode current collector to 40% of the thickness of the electrode mixture layer is defined as a second region, the first region and the second region have different volume change ratio upon charge and discharge, and the region having the larger volume change ratio upon charge and discharge has a higher content of a solid inorganic filler and a lower content of a hollow inorganic filler than the region having the smaller volume change ratio.Type: ApplicationFiled: December 17, 2020Publication date: June 24, 2021Applicants: Panasonic Corporation, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Naoto Onodera, Katsunori Yanagida, Yo Kato
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Publication number: 20210193995Abstract: This negative electrode comprises a electrode current collector, a first electrode mixture layer provided on the surface of the electrode current collector, and a second electrode mixture layer provided on the surface of the first electrode mixture layer. The first electrode mixture layer and the second electrode mixture layer have different volume change ratio upon charge and discharge. The first electrode mixture layer has an interface portion in contact with the second electrode mixture layer, and a body portion located nearer to the electrode current collector side than the interface portion. The thickness of the interface portion t satisfies a relationship t?dg/2 with an average particle size of the graphite particles included in the first electrode mixture layer being dg. The content of an inorganic filler in the interface portion is higher than the content of the inorganic filler included in the body portion.Type: ApplicationFiled: December 16, 2020Publication date: June 24, 2021Applicants: Panasonic Corporation, Toyota Jidosha Kabushiki KaishaInventors: Naoto Onodera, Katsunori Yanagida, Yo Kato
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Patent number: 10923705Abstract: A negative electrode active material, a first carbon material, a thickener, and a solvent are mixed to prepare a first dispersion solution. The first dispersion solution and a second carbon material are mixed to prepare a second dispersion solution. The second dispersion solution and a binder are mixed to prepare a negative electrode paint. The negative electrode paint is applied to a surface of a negative electrode current collector and dried to produce a negative electrode for a nonaqueous electrolyte secondary battery. The negative electrode active material has a BET specific surface area of 3 m2/g or more and 8 m2/g or less. The first carbon material has a BET specific surface area of 30 m2/g or more and 100 m2/g or less. The second carbon material has a BET specific surface area of 200 m2/g or more and 500 m2/g or less.Type: GrantFiled: May 11, 2018Date of Patent: February 16, 2021Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Ryosuke Ohsawa, Kaoru Inoue, Naoto Onodera
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Patent number: 10886522Abstract: A method of producing a non-aqueous electrolyte secondary battery includes at least the following (?), (?), and (?): (?) preparing an elementary battery including at least a positive electrode, a negative electrode, a gel film, and an electrolyte solution; (?) carrying out initial charge of the elementary battery; and (?) after the initial charge, processing the elementary battery to produce a finished-product battery. The negative electrode includes at least a negative electrode active material. The gel film is formed on a surface of the negative electrode. The gel film contains a polymer material and the electrolyte solution. The gel film is thixotropic. The initial charge is carried out while the gel film is under a first pressure. The processing is carried out in such a way that the gel film is put under a second pressure. The second pressure is higher than the first pressure.Type: GrantFiled: November 19, 2018Date of Patent: January 5, 2021Assignee: Toyota Jidosha Kabushiki KaishaInventors: Atsushi Sugihara, Naoto Onodera
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Publication number: 20200251738Abstract: According to the present disclosure, there is provided a technique capable of suitably reducing the battery resistance of a lithium ion secondary battery. In an aspect of a negative electrode disclosed herein, a negative electrode active material layer contains a negative electrode active material, a binder which includes a water-soluble polymer lithium salt, and a sub-material particle including a metal compound which has a hydroxyl group. With this, hopping conduction in which a Li ion moves in such a manner as to slide on hydroxyl groups on the surface of the sub-material particle can occur, and hence it is possible to accelerate supply of the Li ion to the negative electrode active material and achieve a significant reduction in the battery resistance of the lithium secondary battery.Type: ApplicationFiled: January 22, 2020Publication date: August 6, 2020Inventors: Yutaka OYAMA, Yuji YOKOYAMA, Naoto ONODERA
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Publication number: 20200106101Abstract: A negative electrode includes at least a negative electrode composite material layer. The negative electrode composite material layer contains at least composite particles and a binder. Each composite particle includes a negative electrode active material particle and a film. The film covers at least part of a surface of the negative electrode active material particle. The film contains a layered silicate mineral. The binder includes nanofibers.Type: ApplicationFiled: September 30, 2019Publication date: April 2, 2020Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yutaka OYAMA, Naoto Onodera
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Patent number: 10461310Abstract: A manufacturing method for a non-aqueous electrolyte secondary battery includes: forming a powder; forming a sheet-like green compact; and forming a heat-resistant layer. The powder contains composite particles and a solvent. The composite particles contain inorganic filler particles and a binder. The green compact is formed by pressing the powder in a state in which the solvent remains. The heat-resistant layer is formed by disposing the green compact on a surface of at least any of a positive electrode mixture layer and a negative electrode mixture layer after the green compact is formed.Type: GrantFiled: February 9, 2016Date of Patent: October 29, 2019Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroya Umeyama, Yusuke Fukumoto, Naoyuki Wada, Yuji Yokoyama, Tatsuya Hashimoto, Naoto Onodera