Patents by Inventor Masahiro Soga
Masahiro Soga 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: 20240405219Abstract: An electrode for secondary batteries according to one embodiment of the present invention is provided with a core body and a mixture layer that is formed on the core body. The mixture layer comprises a first mixture layer and a second mixture layer that is arranged on the first mixture layer. The tortuosity (?2) of the second mixture layer is lower than the tortuosity (?1) of the first mixture layer. The ratio (?2/?1) of the tortuosity (?2) to the tortuosity (?1) satisfies, for example, 0.3?(?2/?1)<1.Type: ApplicationFiled: September 21, 2022Publication date: December 5, 2024Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Norihisa Yamamoto, Masahiro Soga, Naomichi Sato
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Publication number: 20240405214Abstract: A secondary battery according to one embodiment of the present invention is provided with: a positive electrode that has a positive electrode core and a positive electrode mixture layer formed on said core; a negative electrode that has a negative electrode core and a negative electrode mixture layer formed on said core; and an electrolyte. The positive electrode mixture layer and the negative electrode mixture layer each includes a first mixture layer and a second mixture layer arranged on the first mixture layer. The curve ratio (?2) of the second mixture layer is less than the curve ratio (?1) of the first mixture layer.Type: ApplicationFiled: September 22, 2022Publication date: December 5, 2024Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Norihisa Yamamoto, Masahiro Soga, Naomichi Sato
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Publication number: 20240405205Abstract: An electrode for secondary batteries according to one example of an embodiment is provided with a core body and a mixture layer that is formed on the core body. The mixture layer includes a first mixture layer and a second mixture layer disposed on the first mixture layer, and contains graphite and silicon material as active materials, and the content of the silicon material is greater than or equal to 0.5% by mass with respect to the active material. The ratio (?2/?1) of the tortuosity factor (?2) of the second mixture layer to the tortuosity factor (?1) of the first mixture layer is less than 1.1.Type: ApplicationFiled: September 21, 2022Publication date: December 5, 2024Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Masahiro Soga, Norihisa Yamamoto, Naomichi Sato
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Publication number: 20240387810Abstract: This negative electrode for a rechargeable battery, according to an exemplary embodiment, comprises: a core; and a mixture layer formed on the core. The mixture layer includes: a first mixture layer; and a second mixture layer disposed on the first mixture layer. The first mixture layer and the second mixture layer have mutually different pore size distributions. In a case where a pore size corresponding to the maximum peak of the pore size distribution of the first mixture layer is defined as pore size A and a pore size corresponding to the maximum peak of the pore size distribution of the second mixture layer is defined as pore size B, the ratio of pore size A to pore size B (A/B) is greater than 0.01 and less than 1.Type: ApplicationFiled: September 20, 2022Publication date: November 21, 2024Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Naomichi Sato, Norihisa Yamamoto, Masahiro Soga
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Patent number: 12148917Abstract: A negative electrode for a non-aqueous electrolyte secondary battery includes a negative electrode material mixture including a negative electrode active material capable of electrochemically absorbing and desorbing lithium ions, a carbon nanotube; and an acrylic resin. The negative electrode active material includes a composite material including a silicate phase, and silicon particles dispersed in the silicate phase, and the silicate phase includes at least one selected from the group consisting of alkali metal elements and Group 2 elements.Type: GrantFiled: February 17, 2020Date of Patent: November 19, 2024Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Takahiro Fukuoka, Masaki Hasegawa, Masahiro Soga, Yuto Horiuchi, Takashi Yamamoto
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Patent number: 11949091Abstract: A charging method of a non-aqueous electrolyte secondary battery involves a first charging step in which, defining x as the ratio of the capacity of a silicon compound to the rated capacity Q (0.1?x?0.5), charging is performed at a first fixed current value I1st that satisfies the expression below; and a high current charging step in which after completion of the first charging step, charging is performed at a fixed current value Imax higher than the first fixed current value I1st.Type: GrantFiled: January 25, 2019Date of Patent: April 2, 2024Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Masahiro Soga, Taisuke Yamamoto
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Patent number: 11916220Abstract: A charging method of a non-aqueous electrolyte secondary battery involves a first charging step in which, defining x as the ratio of the capacity of a silicon compound to the rated capacity Q (0.1?x?0.5), charging is performed at a first fixed current value I1st that satisfies the expression below; and a high current charging step in which after completion of the first charging step, charging is performed at a fixed current value Imax higher than the first fixed current value I1st.Type: GrantFiled: January 25, 2019Date of Patent: February 27, 2024Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Masahiro Soga, Taisuke Yamamoto
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Publication number: 20230361307Abstract: A secondary battery negative electrode according to the present invention is provided with a negative electrode mixture layer comprising: a negative electrode active material that contains an Si compound; and a binding material that includes cellulose nanofibers having a fiber diameter of 9 nm or less and a conductive material containing single-walled carbon nanotubes having a fiber diameter of less than 4 nm. The content of the cellulose nanofibers is greater than or equal to 0.005 mass % and less than 0.2 mass % in relation to the mass of the negative electrode active material.Type: ApplicationFiled: September 15, 2021Publication date: November 9, 2023Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Norihisa Yamamoto, Masahiro Soga, Takashi Watanabe
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Patent number: 11811255Abstract: A charging method of a non-aqueous electrolyte secondary battery involves a first charging step in which, defining x as the ratio of the capacity of a silicon compound to the rated capacity Q(0.1?x?0.5), a battery capacity Q1st that satisfies the expression below is charged at a first fixed current value; and a high current charging step in which, after completion of the first charging step, charging is performed at a fixed current value higher than the first fixed current value. 0.38x+0.063???Q1st/Q?0.38x+0.Type: GrantFiled: January 22, 2019Date of Patent: November 7, 2023Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Masahiro Soga, Taisuke Yamamoto
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Publication number: 20230343942Abstract: This negative electrode for a secondary battery is provided with a negative electrode mixture layer comprising an Si compound-containing negative electrode active material, a conductive material and a binding material; the conductive material includes single-layer carbon nanotubes with a outermost diameter of at most 5 nm, and the binding material contains carboxymethyl cellulose salt with a weight average molecular weight of 150,000-450,000.Type: ApplicationFiled: September 14, 2021Publication date: October 26, 2023Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Norihisa Yamamoto, Masahiro Soga
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Publication number: 20230317950Abstract: A negative electrode for a non-aqueous electrolyte secondary battery includes a negative electrode mixture including a negative electrode active material capable of electrochemically absorbing and releasing lithium ions, carbon nanotubes, and a binder. The negative electrode active material includes a silicon-containing material, and the binder includes an acrylic polymer. The polymer includes a hydrophilic structural unit having a carboxyl group, and a hydrophobic structural unit.Type: ApplicationFiled: June 24, 2021Publication date: October 5, 2023Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Norihisa Yamamoto, Nobuhiko Hojo, Masahiro Soga
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Publication number: 20230216042Abstract: This negative electrode for nonaqueous electrolyte secondary batteries is provided with a negative electrode mixture layer that contains a negative electrode active material and carbon nanotubes. The negative electrode active material contains a first negative electrode active material and a second negative electrode active material; the first negative electrode active material and the second negative electrode active material contain lithium silicate phases, each of which contains lithium, silicon and oxygen, and silicon particles that are dispersed in the lithium silicate phases; the molar ratios of oxygen to silicon (O/Si) in the lithium silicate phases are different from each other; the carbon nanotubes have a diameter of from 1 nm to 5 nm; and the ratio of the mass of the first negative electrode active material relative to the total mass of the first negative electrode active material and the second negative electrode active material is 60% or less.Type: ApplicationFiled: March 25, 2021Publication date: July 6, 2023Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Shunsuke Nambuya, Norihisa Yamamoto, Masahiro Soga
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Publication number: 20230086333Abstract: A negative electrode for a nonaqueous electrolyte secondary battery includes a negative electrode mixture including a negative electrode active material capable of electrochemically storing and releasing lithium ions, a carbon nanotube, and an acrylic resin, wherein the negative electrode active material includes a silicon-containing material, and the carbon nanotube has an average diameter of 5 nm or less.Type: ApplicationFiled: February 9, 2021Publication date: March 23, 2023Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Masahiro Soga, Norihisa Yamamoto
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Publication number: 20220302451Abstract: A negative electrode for a secondary battery including a negative electrode active material capable of absorbing and releasing lithium ions. The negative electrode active material includes a first carbon material as a main component, and includes a second carbon material and a silicon-containing material which are present between particles of the first carbon material. The first carbon material has an average particle diameter A, the second carbon material has an average particle diameter B, and the silicon-containing material has an average particle diameter C, satisfying A>C?B.Type: ApplicationFiled: July 21, 2020Publication date: September 22, 2022Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Masahiro Soga, Masaki Hasegawa, Takahiro Fukuoka
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Publication number: 20220190320Abstract: A negative electrode for a non-aqueous electrolyte secondary battery includes a negative electrode material mixture including a negative electrode active material capable of electrochemically absorbing and desorbing lithium ions, a carbon nanotube; and an acrylic resin. The negative electrode active material includes a composite material including a silicate phase, and silicon particles dispersed in the silicate phase, and the silicate phase includes at least one selected from the group consisting of alkali metal elements and Group 2 elements.Type: ApplicationFiled: February 17, 2020Publication date: June 16, 2022Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Takahiro Fukuoka, Masaki Hasegawa, Masahiro Soga, Yuto Horiuchi, Takashi Yamamoto
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Publication number: 20220190314Abstract: A negative electrode for a non-aqueous electrolyte secondary battery includes a negative electrode mixture comprising a negative electrode active material capable of electrochemically absorbing and releasing lithium ions, a negative electrode additive, and an acrylic resin. The negative electrode active material includes a silicon containing material. The Negative electrode additive includes at least silicon dioxide and a group 2 element oxide, and the group 2 element oxide includes at least one selected from the group consisting of BeO, MgO, CaO, SrO, BaO and RaO. The acrylic resin includes at least a (meth)acrylic acid salt unit. The content of the group 2 element oxide in the negative electrode additive is less than 20 mass % relative to a total amount of the negative electrode additive.Type: ApplicationFiled: March 11, 2020Publication date: June 16, 2022Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Yohei Uchiyama, Taisuke Asano, Yosuke Sato, Masahiro Soga
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Publication number: 20220158181Abstract: A negative electrode material mixture with a negative electrode active material including a Si-containing material and a carbon material; and a carbon nanotube. The Si-containing material includes, a first composite material in which Si particles are dispersed in a lithium silicate phase and/or a carbon phase, and a second composite material in which Si particles are dispersed in a SiO2 phase, at least the first composite material. A mass ratio X of the first composite material to a total of the first and second composite materials, and a mass ratio Y of the total of the first second composite materials to a total of the first composite material, the second composite material, and the carbon material satisfy a relational expression (1): 100Y?32.2X5+65.479X4?55.832X3+18.116X2?6.9275X?3.5356<0, X?1, and 0.06?Y. The non-aqueous electrolyte includes LiPF6 and LiN(SO2F)2.Type: ApplicationFiled: March 2, 2020Publication date: May 19, 2022Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Yukiho Okuno, Takahiro Fukuoka, Tasuku Ishiguro, Masahiro Soga
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Publication number: 20200403220Abstract: A charging method of a non-aqueous electrolyte secondary battery involves a first charging step in which, defining x as the ratio of the capacity of a silicon compound to the rated capacity Q (0.1?x?0.5), charging is performed at a first fixed current value I1st that satisfies the expression below; and a high current charging step in which after completion of the first charging step, charging is performed at a fixed current value Imax higher than the first fixed current value I1st. 82/(81.8x+64)×(0.3/0.7)???I1st/Imax?82/(81.8x+64)×(0.3/0.7)+?(?=0.Type: ApplicationFiled: January 25, 2019Publication date: December 24, 2020Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Masahiro Soga, Taisuke Yamamoto
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Publication number: 20200403432Abstract: A charging method of a non-aqueous electrolyte secondary battery involves a first charging step in which, defining x as the ratio of the capacity of a silicon compound to the rated capacity Q(0.1?x?0.5), a battery capacity Q1st that satisfies the expression below is charged at a first fixed current value; and a high current charging step in which, after completion of the first charging step, charging is performed at a fixed current value higher than the first fixed current value. 0.38x+0.063???Q1st/Q?0.38x+0.Type: ApplicationFiled: January 22, 2019Publication date: December 24, 2020Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Masahiro Soga, Taisuke Yamamoto
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Patent number: D339801Type: GrantFiled: March 2, 1992Date of Patent: September 28, 1993Inventors: Atsuhiko Urushihara, Taisuke Kashima, Sumie Komuro, Hideo Nakazawa, Masahiro Soga