Patents by Inventor Nobuhiro Sakitani
Nobuhiro Sakitani 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: 20250015267Abstract: A nonaqueous electrolyte secondary battery positive electrode comprises a positive electrode mixture layer that contains, as positive electrode active materials, first lithium-containing transition metal composite oxide particles, which are non-aggregated particles having a volume-based median diameter of 2-10 ?m, and second lithium-containing transition metal composite oxide particles, which are secondary particles having a volume-based median diameter of 10-30 ?m and formed by the agglomeration of primary particles having an average particle diameter of 50 nm-2 ?m, and that has a first layer formed on the positive electrode core material side and a second layer formed on the first layer. The first layer contains at least the first composite oxide particles, and the content of said composite oxide particles is 80% or more relative to the total mass of the positive electrode active materials contained in the first layer. The second layer contains at least the second composite oxide particles.Type: ApplicationFiled: October 17, 2022Publication date: January 9, 2025Applicant: Panasonic Energy Co., Ltd.Inventors: Tomoki Ikeda, Masashi Aotani, Nobuhiro Sakitani
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Publication number: 20240413326Abstract: The purpose of the present invention is to provide a winding-type nonaqueous electrolyte secondary battery which is capable of minimizing degradation of charge-discharge cycle characteristics.Type: ApplicationFiled: July 16, 2024Publication date: December 12, 2024Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Shigeki MORIYA, Nobuhiro SAKITANI, Takaharu MORIKAWA
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Patent number: 12155064Abstract: A nonaqueous electrolyte secondary battery including an electrode body which comprises a positive electrode, a negative electrode and a separator that is arranged between the positive electrode and the negative electrode, while comprising a heat-resistant layer and a base material layer; and a nonaqueous electrolyte. The positive electrode having a positive electrode mixture layer containing a positive electrode active material and resin-coated particles obtained by coating metal-based particles with a resin that melts at a temperature from 100° C. to 150° C.; the metal-based particles contain at least either metal or metal compound particles, which are dissolved in the nonaqueous electrolyte at 4.3 V (vs. Li/Li+) or less; the metal-based particles have an average particle diameter of more than 1 ?m; the content of the resin-coated particles is 0.5%-10% by mass relative to the total amount of the positive electrode mixture layer; and the heat-resistant layer contains a filler and a binder.Type: GrantFiled: July 20, 2020Date of Patent: November 26, 2024Assignee: PANASONIC ENERGY CO., LTD.Inventors: Nobuhiro Sakitani, Takaharu Morikawa
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Publication number: 20240291015Abstract: A non-aqueous electrolyte secondary battery includes an electrode body in which a positive electrode and a negative electrode face each other across a separator. The positive electrode includes a positive electrode composite material layer containing a binder, and the negative electrode includes a negative electrode composite material layer containing a binder. The non-aqueous electrolyte secondary battery is characterized in that, in a case of use thereof in a fixed state, and the electrode body is equally divided into two of an upper half region and a lower half region with respect to a vertical direction in this fixed state, a swelling degree with an electrolyte is higher for the binder disposed in the upper half region than a swelling degree with the electrolyte for the binder disposed in the lower half region, in at least one of the positive electrode and the negative electrode.Type: ApplicationFiled: June 15, 2022Publication date: August 29, 2024Applicant: Panasonic Energy Co., Ltd.Inventor: Nobuhiro Sakitani
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Publication number: 20240290975Abstract: A non-aqueous electrolyte secondary battery is characterized in that: an electrode body in which a positive electrode and a negative electrode oppose each other through a separator, and a battery case accommodating the electrode body, are provided; the negative electrode has a negative electrode mixture layer containing first carbon particles and second carbon particles having a lower internal porosity than the first carbon particles; the non-aqueous electrolyte secondary battery is used in a fixed state; and when the electrode body in the fixed state is bisected into a top half region and a bottom half region with respect to the vertical direction, the second carbon particles are contained in greater number in the top half region than the bottom half region.Type: ApplicationFiled: June 7, 2022Publication date: August 29, 2024Applicant: Panasonic Energy Co., Ltd.Inventor: Nobuhiro Sakitani
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Patent number: 12068479Abstract: The purpose of the present invention is to provide a winding-type nonaqueous electrolyte secondary battery which is capable of minimizing degradation of charge-discharge cycle characteristics.Type: GrantFiled: February 14, 2020Date of Patent: August 20, 2024Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Shigeki Moriya, Nobuhiro Sakitani, Takaharu Morikawa
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Patent number: 12027694Abstract: A nonaqueous electrolyte secondary battery according to an embodiment includes a spirally wound electrode body in which a positive electrode and a negative electrode are spirally wound with a separator interposed therebetween. The negative electrode includes a negative electrode current collector, a first negative electrode mixture layer disposed on a first surface of the negative electrode current collector, and a second negative electrode mixture layer disposed on a second surface of the negative electrode current collector. The first surface and the second surface face outward and inward of the electrode body, respectively. At least the first negative electrode mixture layer includes a Si active material. The content of the Si active material in terms of Si in the second negative electrode mixture layer is lower than the content of the Si active material in terms of Si in the first negative electrode mixture layer.Type: GrantFiled: April 26, 2019Date of Patent: July 2, 2024Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Takamasa Tamura, Nobuhiro Sakitani, Takaharu Morikawa
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Patent number: 12009512Abstract: A nonaqueous electrolyte secondary battery according to an embodiment includes a negative electrode including a negative electrode current collector, a first negative electrode mixture layer disposed on a first surface of the negative electrode current collector, and a second negative electrode mixture layer disposed on a second surface of the negative electrode current collector. The first surface and the second surface face outward and inward of the electrode body, respectively. The first negative electrode mixture layer includes a Si active material. The content of the Si active material in teens of Si is lower in a portion of the first negative electrode mixture layer which faces the negative electrode current collector in a thickness direction of the first negative electrode mixture layer, than in a portion of the first negative electrode mixture layer which faces the surface of the first negative electrode mixture layer in the thickness direction.Type: GrantFiled: April 26, 2019Date of Patent: June 11, 2024Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Takamasa Tamura, Nobuhiro Sakitani, Takaharu Morikawa
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Patent number: 11962011Abstract: A battery including a coiled electrode assembly with positive and negative electrodes coiled with a separator interposed therebetween, where the negative electrode includes a negative electrode current collector, a first negative electrode mixture layer formed on a first surface of the negative electrode current collector, the first surface facing an outside of the electrode assembly, and a second negative electrode mixture layer formed on a second surface of the negative electrode current collector, the second surface facing an inside of the electrode assembly. The first negative electrode mixture layer contains cellulose and rubber binders. A content of the cellulose binder is larger near a surface of the mixture layer than near the negative electrode current collector and a content of the rubber binder is larger near the negative electrode current collector than near the surface of the mixture layer in the thickness direction of the first negative electrode mixture layer.Type: GrantFiled: April 26, 2019Date of Patent: April 16, 2024Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Sho Urata, Nobuhiro Sakitani
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Publication number: 20240120553Abstract: Provided is a non-aqueous electrolyte secondary, rile non-aqueous electrolyte secondary battery according to one mode of the present disclosure comprises an electrode body in Which a band-form positive electrode and a band-forth negative electrode are wound with a separator interposed therebetween, an electrolytic liquid, and an exterior body that accommodates the electrode body and the electrolytic liquid. The negative electrode has a negative electrode current collector, and a negative electrode mixture layer that is formed on the surface of the negative electrode current collector and that contains a negative electrode active material and an electroconductive agent.Type: ApplicationFiled: January 21, 2022Publication date: April 11, 2024Applicant: Panasonic Energy Co., LtdInventors: Fumikazu Mizukoshi, Nobuhiro Sakitani
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Publication number: 20240088390Abstract: A non-aqueous electrolyte secondary battery according to an aspect of the present disclosure comprises: an electrode body in which a belt-shaped positive electrode and a belt-shaped negative electrode are wound with a separator therebetween; an electrolyte; and an outer case which accommodates the electrode body and the electrolyte. The negative electrode has a negative electrode current collector and a negative electrode mixture layer which is formed on a surface of the negative electrode current collector and which contains a negative electrode active material and a solid electrolyte. The negative electrode mixture layer has a region in which the solid electrolyte content in the inner winding end part is higher than the solid electrolyte content in the outer winding end part, and the solid electrolyte content continuously decreases from the inner winding end part side to the outer winding end part side.Type: ApplicationFiled: January 25, 2022Publication date: March 14, 2024Applicant: Panasonic Energy Co., Ltd.Inventors: Fumikazu Mizukoshi, Nobuhiro Sakitani
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Publication number: 20240021789Abstract: A non-aqueous electrolyte secondary battery is characterized by comprising an electrode body in which a positive electrode and a negative electrode face each other with a separator therebetween, and a battery case that accommodates the electrode body, wherein: the positive electrode has a positive electrode mixture layer containing a positive electrode active material; and when the non-aqueous electrolyte secondary battery is used in a fixed state, and the electrode body in the fixed state is bisected in the vertical direction, a dibutyl phthalate oil absorption amount of the positive electrode active material contained in the positive electrode mixture layer disposed in the top half region is higher than a dibutyl phthalate oil absorption amount of the positive electrode active material contained in the positive electrode mixture layer disposed in the bottom half region.Type: ApplicationFiled: November 15, 2021Publication date: January 18, 2024Applicant: Panasonic Energy Co., Ltd.Inventors: Nobuhiro Sakitani, Tomoki Ikeda
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Patent number: 11870076Abstract: A water-based binder for a non-aqueous electrolyte secondary battery. A binder for a non-aqueous electrolyte secondary battery electrode, includes a crosslinked polymer having a carboxyl group or a salt thereof, and the crosslinked polymer includes a structural unit derived from an ethylenically unsaturated carboxylic acid monomer; and a structural unit derived from a macromonomer including at least one compositional monomer selected from compounds represented by following formula (1): [C1] H2C?CR1—X??formula (1) wherein in formula (1), R1 represents a hydrogen or a methyl group; X represents C(?O)OR2 or CN; and R2 represents a straight chain or branched C1-C8 alkyl group or a C3-C8 alkyl group having an alicyclic structure.Type: GrantFiled: March 5, 2018Date of Patent: January 9, 2024Assignees: TOAGOSEI CO., LTD., PANASONIC ENERGY CO., LTD.Inventors: Naohiko Saito, Takashi Hasegawa, Atsushi Nishiwaki, Hideo Matsuzaki, Nobuhiro Sakitani, Sho Urata, Takaharu Morikawa
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Publication number: 20230420638Abstract: A positive electrode for a non-aqueous electrolyte secondary battery comprises a positive electrode mixture layer includes a positive electrode active substance. The quantity of dibutyl phthalate oil absorbed by the positive electrode active substance included in a lower-half region of the positive electrode mixture layer, when the positive electrode mixture layer is divided in the thickness direction into two equal parts, is less than the quantity of dibutyl phthalate oil absorbed by the positive electrode active substance included in an upper-half region; the quantity of dibutyl phthalate oil absorbed by the positive electrode active substance included in the lower-half region is at least 11 mL/100 g and no more than 19 mL/100 g; and the quantity of dibutyl phthalate oil absorbed by the positive electrode active substance included in the upper-half region is at least 15 mL/100 g and no more than 23 mL/100 g.Type: ApplicationFiled: November 15, 2021Publication date: December 28, 2023Applicant: Panasonic Energy Co., Ltd.Inventors: Tomoki Ikeda, Nobuhiro Sakitani
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Publication number: 20230420803Abstract: An embodiment of the present invention provides a non-aqueous electrolyte secondary battery wherein a separator has a porous base material and a heat-resistant layer including a filler and a binding agent. The heat-resistant layer includes a first heat-resistant layer formed on a first surface of the base material facing a positive electrode and a second heat-resistant layer formed on a second surface of the base material facing a negative electrode. The first heat-resistant material is formed as a sheet on the first surface of the base material and the second heat-resistant layer is formed as dots on the second surface of the base material. The average value of the intervals between the plurality of dots constituting the second heat-resistant layer is 30-100 ?m.Type: ApplicationFiled: February 3, 2022Publication date: December 28, 2023Applicant: Panasonic Energy Co., LtdInventors: Kazuki Kitta, Shinji Kasamatsu, Nobuhiro Sakitani
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Publication number: 20230361268Abstract: A non-aqueous electrolyte secondary battery including a wound electrode body in which a positive electrode and a negative electrode are wound with a separator therebetween; the positive electrode having a positive electrode current collector, a first positive electrode mixture layer formed on a first surface of the positive electrode current collector which faces the outside of the electrode body, and a second positive electrode mixture layer formed on a second surface of the positive electrode current collector which faces the inside of the electrode body; the first positive electrode mixture layer and the second positive electrode mixture layer each containing a positive electrode active material; and the dibutyl phthalate oil absorption amount of the positive electrode active material contained in the first positive electrode mixture layer being less than the dibutyl phthalate oil absorption amount of the positive electrode active material contained in the second positive electrode mixture layer.Type: ApplicationFiled: November 17, 2021Publication date: November 9, 2023Applicant: Panasonic Energy Co., Ltd.Inventors: Mai Yokoi, Tomoki Ikeda, Nobuhiro Sakitani
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Patent number: 11773246Abstract: A binder for a non-aqueous electrolyte secondary battery electrode that includes a crosslinked polymer having a carboxyl group or a salt thereof, wherein the crosslinked polymer includes 50% by mass or more and 100% by mass or less structural unit derived from an ethylenically unsaturated carboxylic acid monomer relative to all structural units, wherein a total amount of the ethylenically unsaturated carboxylic acid monomer and a salt thereof in terms of a non-neutralized form which is converted from the ethylenically unsaturated carboxylic acid monomer and a salt thereof relative to a total amount of the crosslinked polymer and a salt thereof is 5.0% by mass or less.Type: GrantFiled: March 5, 2018Date of Patent: October 3, 2023Assignees: TOAGOSEI CO. LTD., PANASONIC ENERGY CO., LTD.Inventors: Takashi Hasegawa, Naohiko Saito, Atsushi Nishiwaki, Hideo Matsuzaki, Sho Urata, Nobuhiro Sakitani, Takaharu Morikawa
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Publication number: 20230261321Abstract: A separator for nonaqueous electrolyte secondary batteries according to one embodiment of the present disclosure comprises a porous base material and a heat-resistant porous film that is arranged on at least one surface of the porous base material so as to face an electrode of a nonaqueous electrolyte secondary battery. The heat-resistant porous film contains a filler and a binder; and at least a part of a facing part A of the heat-resistant porous film, said facing part A facing the edge portion of the electrode, has a higher binder content than a facing part B of the heat-resistant porous film, said facing part B facing the central portion of the electrode.Type: ApplicationFiled: June 16, 2021Publication date: August 17, 2023Applicant: SANYO Electric Co., Ltd.Inventor: Nobuhiro Sakitani
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Publication number: 20230246168Abstract: A nonaqueous electrolyte secondary battery provided with a positive electrode, a negative electrode and a nonaqueous electrolyte. An electrode mixture layer of the positive electrode contains: first lithium metal composite oxide particles that are non-aggregated particles which have a volume-based median diameter of from 2 ?m to 10 ?m; and second lithium metal composite oxide particles that are secondary particles, in each of which primary particles having an average particle diameter of from 50 nm to 2 ?m aggregate, and which have a volume-based median diameter of from 10 ?m to 30 ?m. With a first region and the second region sequentially halved from the surface side of the positive electrode mixture layer, the content of the first lithium metal composite oxide particles in the first region is higher than the content of the first lithium metal composite oxide particles in the second region.Type: ApplicationFiled: August 19, 2021Publication date: August 3, 2023Applicant: SANYO Electric Co., Ltd.Inventors: Nobuhiro Sakitani, Koki Morita, Shun Nomura, Hiroyuki Fujimoto
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Publication number: 20230187645Abstract: A nonaqueous electrolyte secondary battery positive electrode according to an aspect of the present disclosure is provided with a positive electrode collector and a positive electrode mixture layer that is formed on the surface of the positive electrode collector. The positive electrode mixture layer contains a positive electrode active material, fibrous carbon, and nonfibrous carbon. When the positive electrode mixture layer is divided into two equal regions in the thickness direction, and the half of the regions that is on the positive electrode collector side is defined as a first region and the half of the regions that is on the outer surface side is defined as a second region, the mass proportion of the fibrous carbon with respect to the total mass of the fibrous carbon and the nonfibrous carbon in the first region is set to be less than that in the second region.Type: ApplicationFiled: May 12, 2021Publication date: June 15, 2023Applicant: SANYO Electric Co., Ltd.Inventor: Nobuhiro Sakitani