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公开(公告)号：US20230163292A1
公开(公告)日：2023-05-25
申请号：US17915051
申请日：2021-03-23
Inventor： Youichirou Uka , Koh Masahara , Tomohiro Harada , Rina Yamamoto , Tomohisa Okazaki
Abstract: This positive electrode for secondary batteries is provided with a positive electrode collector and a positive electrode mixture layer that is arranged on the positive electrode collector. The positive electrode mixture layer contains a positive electrode active material that contains a lithium-transition metal composite oxide and carbon fibers each having an outermost peripheral diameter of 20 nm or less; the lithium-transition metal composite oxide contains 80% by mole or more of Ni relative to the total number of moles of metal elements excluding Li; an alkaline earth metal element is present on the particle surfaces of the oxide; and the content of the carbon fibers relative to the total amount of the positive electrode active material is from 0.01% by mass to 1.0% by mass.
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公开(公告)号：US20230047021A1
公开(公告)日：2023-02-16
申请号：US17796544
申请日：2021-01-21
Inventor： Rina Yamamoto , Youichirou Uka
IPC: H01M4/36 , H01M10/0525
Abstract: A positive electrode for a secondary battery including a positive electrode current collector, and a positive electrode mixture layer containing a positive electrode active material and disposed on a surface of the positive electrode current collector. The positive electrode mixture layer contains a first positive electrode active material having a compressive strength of 400 MPa or more, and a second positive electrode active material having a compressive strength of 250 MPa or less. When the positive electrode mixture layer is divided into a first region and a second region having the same thickness, the first positive electrode active material is contained more in the first region than in the second region, and the second positive electrode active material is contained more in the second region than in the first region.
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公开(公告)号：US20240178396A1
公开(公告)日：2024-05-30
申请号：US18284205
申请日：2022-03-30
Inventor： Kosuke Kuroda , Youichirou Uka , Koh Masahara , Tomohiro Harada , Rina Yamamoto
IPC: H01M4/62 , C09D5/24 , C09D7/40 , C09D7/45 , C09D7/61 , C09D7/65 , C09D139/06 , H01M4/131 , H01M4/525
CPC classification number: H01M4/622 , C09D5/24 , C09D7/45 , C09D7/61 , C09D7/65 , C09D7/70 , C09D139/06 , H01M4/131 , H01M4/525 , H01M4/625
Abstract: A disclosed conductive material dispersion liquid includes a conductive material including carbon nanotubes, dispersants, and a polar aprotic solvent. The dispersants include a polyvinylpyrrolidone-based compound and a cellulose derivative.
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Patent Agency Ranking
4.发明公开公开(公告)号：US20240162415A1
公开(公告)日：2024-05-16
申请号：US18284686
申请日：2022-03-30
Inventor： Kosuke Kuroda , Youichirou Uka , Koh Masahara , Rina Yamamoto , Tomohiro Harada
CPC classification number: H01M4/364 , H01M4/525 , H01M4/583 , H01M4/623 , H01M2004/028 , H01M4/13 , H01M4/661
Abstract: A disclosed positive electrode for a nonaqueous electrolyte secondary battery includes a positive-electrode current collector and a positive-electrode mixture layer on a surface of the positive-electrode current collector. The positive-electrode mixture layer includes a positive-electrode active material, a conductive material, and binders. The binders include a polyvinylpyrrolidone-based compound and a cellulose derivative.
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公开(公告)号：US20220352513A1
公开(公告)日：2022-11-03
申请号：US17764789
申请日：2020-09-03
Inventor： Tomohiro Harada , Rina Yamamoto
IPC: H01M4/525 , H01M4/62 , H01M4/505 , H01M4/36 , H01M10/0525
Abstract: A positive electrode for a nonaqueous electrolyte secondary battery includes a positive electrode mixture layer, wherein the positive electrode mixture layer includes a positive electrode active material, a first binder, and a second binder; the positive electrode active material includes a composite oxide represented by the following formula (1): LiaNixCoyMe(1-x-y)O2 (1), where 0.97≤a≤1.2, 0.5≤x≤1, and 0≤y≤0.1; the element Me is at least one selected from the group consisting of Al, Mn, B, W, Sr, Mg, Mo, Nb, Ti, Si, and Zr; the first binder is a polymeric binder comprising at least a vinylidene fluoride unit; the second binder is a polymeric binder comprising at least a diene unit; and a ratio of the second binder to a total amount of the first binder and the second binder is 5 mass % or more and 35 mass % or less.
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公开(公告)号：US20240405192A1
公开(公告)日：2024-12-05
申请号：US18696472
申请日：2022-09-27
Inventor： Rina Yamamoto , Youichirou Uka , Yoshio Kato
Abstract: A positive electrode for a secondary battery including a positive electrode current collector, and a positive electrode mixture layer containing a positive electrode active material and disposed on a surface of the positive electrode current collector in which the positive electrode mixture layer contains a first positive electrode active material having a compressive strength of 400 MPa or less, a second positive electrode active material having a compressive strength smaller than the compressive strength of the first positive electrode active material, and when the positive electrode mixture layer is zoned into a first region and a second region having the same thickness, the first positive electrode active material is contained more in the first region than in the second region, and the second positive electrode active material is contained more in the second region than in the first region is used.
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7.发明申请公开(公告)号：US20240396000A1
公开(公告)日：2024-11-28
申请号：US18697323
申请日：2022-09-27
Inventor： Youichirou Uka , Rina Yamamoto , Yoshio Kato
IPC: H01M4/04 , H01M4/02 , H01M4/36 , H01M4/62 , H01M10/052
Abstract: A positive electrode for a secondary battery including a positive electrode current collector, and a positive electrode mixture layer containing a positive electrode active material and disposed on a surface of the positive electrode current collector, in which the positive electrode mixture layer contains a first positive electrode active material, a second positive electrode active material crushable more easily than the first positive electrode active material, and when the positive electrode mixture layer is zoned into a first region and a second region having the same thickness, the first positive electrode active material is contained more in the first region than in the second region, and the second positive electrode active material is contained more in the second region than in the first region is used. The crack ratio of the positive electrode active material in the first region is smaller than that in the second region.
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8.发明公开公开(公告)号：US20230369561A1
公开(公告)日：2023-11-16
申请号：US18029003
申请日：2021-09-14
Inventor： Tomohiro Harada , Rina Yamamoto
IPC: H01M4/131 , H01M10/052 , H01M4/62 , H01M4/525 , H01M4/02
CPC classification number: H01M4/131 , H01M10/052 , H01M4/625 , H01M4/623 , H01M4/525 , H01M2004/028 , H01M2004/021
Abstract: Disclosed is a positive electrode for a non-aqueous electrolyte secondary battery including: a positive electrode current collector sheet; and a positive electrode material mixture layer supported on the positive electrode current collector sheet. The positive electrode material mixture layer contains a positive electrode active material, a binder, and a conductive agent. The positive electrode active material contains a composite oxide that has a layered rock-salt type crystal structure and contains lithium and an element A other than lithium. The element A contains at least nickel. The atomic ratio Ni/A of nickel relative to the element A is 0.8 or more and 1.0 or less. The binder contains a polymer binder that has a three-dimensioned mesh structure. The mass of the positive electrode material mixture layer supported per m2 of the positive electrode current collector sheet is 280 g or more.
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