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公开(公告)号：US20230086333A1
公开(公告)日：2023-03-23
申请号：US17802816
申请日：2021-02-09
Inventor： Masahiro Soga , Norihisa Yamamoto
Abstract: 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.
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公开(公告)号：US20240405214A1
公开(公告)日：2024-12-05
申请号：US18694128
申请日：2022-09-22
Inventor： Norihisa Yamamoto , Masahiro Soga , Naomichi Sato
Abstract: 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 (τ2) of the second mixture layer is less than the curve ratio (τ1) of the first mixture layer.
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公开(公告)号：US20240405205A1
公开(公告)日：2024-12-05
申请号：US18694129
申请日：2022-09-21
Inventor： Masahiro Soga , Norihisa Yamamoto , Naomichi Sato
Abstract: 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 (τ2/τ1) of the tortuosity factor (τ2) of the second mixture layer to the tortuosity factor (τ1) of the first mixture layer is less than 1.1.
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公开(公告)号：US20240387810A1
公开(公告)日：2024-11-21
申请号：US18693294
申请日：2022-09-20
Inventor： Naomichi Sato , Norihisa Yamamoto , Masahiro Soga
Abstract: 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.
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公开(公告)号：US11916220B2
公开(公告)日：2024-02-27
申请号：US16975820
申请日：2019-01-25
Inventor： Masahiro Soga , Taisuke Yamamoto
CPC classification number: H01M4/133 , H01M4/131 , H01M4/134 , H01M10/0525 , H01M10/44 , H01M10/48 , H01M2004/027
Abstract: 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.
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Patent Agency Ranking
公开(公告)号：US11811255B2
公开(公告)日：2023-11-07
申请号：US16975615
申请日：2019-01-22
Inventor： Masahiro Soga , Taisuke Yamamoto
CPC classification number: H02J7/00712 , H01M4/364 , H01M4/483 , H01M4/587 , H01M10/0525 , H01M10/44 , H01M10/48 , H02J7/0048 , H01M2004/027
Abstract: 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−α≤Q1st/Q≤0.38x+0.063+α Expression:-
公开(公告)号：US20220190314A1
公开(公告)日：2022-06-16
申请号：US17439944
申请日：2020-03-11
Inventor： Yohei Uchiyama , Taisuke Asano , Yosuke Sato , Masahiro Soga
IPC: H01M4/134 , H01M10/0567 , H01M10/0525 , H01M4/36
Abstract: 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.
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公开(公告)号：US20220158181A1
公开(公告)日：2022-05-19
申请号：US17442154
申请日：2020-03-02
Inventor： Yukiho Okuno , Takahiro Fukuoka , Tasuku Ishiguro , Masahiro Soga
IPC: H01M4/38 , H01M10/0525 , H01M4/36 , H01M4/587 , H01M4/134
Abstract: 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
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公开(公告)号：US12300819B2
公开(公告)日：2025-05-13
申请号：US17639118
申请日：2020-07-21
Inventor： Masahiro Soga , Masaki Hasegawa , Takahiro Fukuoka
Abstract: 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.
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10.发明授权公开(公告)号：US12148917B2
公开(公告)日：2024-11-19
申请号：US17441961
申请日：2020-02-17
Inventor： Takahiro Fukuoka , Masaki Hasegawa , Masahiro Soga , Yuto Horiuchi , Takashi Yamamoto
Abstract: 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.
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