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公开(公告)号：US20220037661A1
公开(公告)日：2022-02-03
申请号：US17430878
申请日：2020-02-14
Inventor： Shigeki Moriya , Nobuhiro Sakitani , Takaharu Morikawa
Abstract: 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. The winding-type non-aqueous electrolyte secondary battery according to an embodiment of the present invention is provide with a negative electrode that has a negative electrode current collector, an inner-circumference-side negative electrode mixture layer which is disposed, of the two surfaces of the negative electrode current collector, on the inner-circumference-side surface, and an outer-circumference-side negative electrode mixture layer disposed on the outer-circumference-side surface, wherein the inner-circumference-side negative electrode mixture layer and the outer-circumference-side negative electrode mixture layer each include a negative electrode active material and carbon nanotubes, and the carbon nanotubes in the outer-circumference-side negative electrode mixture layer have an average fiber length of 5-30 um, which is longer than that of the carbon nanotubes in inner-circumference-side negative electrode mixture layer.
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公开(公告)号：US20210218019A1
公开(公告)日：2021-07-15
申请号：US17054881
申请日：2019-04-26
Inventor： Takamasa Tamura , Nobuhiro Sakitani , Takaharu Morikawa
IPC: H01M4/38 , H01M4/36 , H01M10/0525 , H01M4/587 , H01M10/0587 , H01M4/02
Abstract: 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 terms 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.
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公开(公告)号：US12068479B2
公开(公告)日：2024-08-20
申请号：US17430878
申请日：2020-02-14
Inventor： Shigeki Moriya , Nobuhiro Sakitani , Takaharu Morikawa
CPC classification number: H01M4/525 , H01M4/366 , H01M4/625 , H01M4/662 , H01M2004/021 , H01M2004/027 , H01M2004/028 , H01M4/364
Abstract: 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. The winding-type nonaqueous electrolyte secondary battery according to an embodiment of the present invention is provide with a negative electrode that has a negative electrode current collector, an inner-circumference-side negative electrode mixture layer which is disposed, of the two surfaces of the negative electrode current collector, on the inner-circumference-side surface, and an outer-circumference-side negative electrode mixture layer disposed on the outer-circumference-side surface, wherein the inner-circumference-side negative electrode mixture layer and the outer-circumference-side negative electrode mixture layer each include a negative electrode active material and carbon nanotubes, and the carbon nanotubes in the outer-circumference-side negative electrode mixture layer have an average fiber length of 5-30 um, which is longer than that of the carbon nanotubes in inner-circumference-side negative electrode mixture layer.
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Patent Agency Ranking
公开(公告)号：US12009512B2
公开(公告)日：2024-06-11
申请号：US17054881
申请日：2019-04-26
Inventor： Takamasa Tamura , Nobuhiro Sakitani , Takaharu Morikawa
IPC: H01M4/38 , H01M4/36 , H01M4/58 , H01M4/583 , H01M4/587 , H01M4/64 , H01M10/0525 , H01M10/0587 , H01M4/02
CPC classification number: H01M4/386 , H01M4/364 , H01M4/583 , H01M4/587 , H01M4/64 , H01M10/0525 , H01M10/0587 , H01M2004/021 , H01M2004/027
Abstract: 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.
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公开(公告)号：US12027694B2
公开(公告)日：2024-07-02
申请号：US17056228
申请日：2019-04-26
Inventor： Takamasa Tamura , Nobuhiro Sakitani , Takaharu Morikawa
IPC: H01M4/36 , H01M4/38 , H01M4/58 , H01M4/583 , H01M4/587 , H01M4/64 , H01M10/0525 , H01M10/0587 , H01M4/02
CPC classification number: H01M4/364 , H01M4/386 , H01M4/583 , H01M4/587 , H01M4/64 , H01M10/0525 , H01M10/0587 , H01M2004/021 , H01M2004/027
Abstract: 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.
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公开(公告)号：US20220037643A1
公开(公告)日：2022-02-03
申请号：US17275247
申请日：2019-09-10
Inventor： Yasunobu Iwami , Nobumichi Nishida , Takaharu Morikawa , Mai Yokoi , Toshiyuki Nakamori
IPC: H01M4/36 , H01M4/133 , H01M4/134 , H01M4/136 , H01M4/38 , H01M4/48 , H01M4/58 , H01M4/587 , H01M10/0525
Abstract: The purpose of the present invention is to provide a nonaqueous electrolyte secondary battery which has excellent charge/discharge cycle characteristics. A nonaqueous electrolyte secondary battery negative electrode which is an example of an embodiment of the present invention comprises, as negative electrode active materials, a carbon active material and a Si active material comprising Si particles dispersed in an oxide phase containing at least silicon (Si). The Si active material includes a first Si active material and a second Si active material. The first Si active material has a median size on a volume basis that is greater than that of the second Si active material and has an Si particle content that is higher than that of the second Si active material.
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公开(公告)号：US20210226199A1
公开(公告)日：2021-07-22
申请号：US17056228
申请日：2019-04-26
Inventor： Takamasa Tamura , Nobuhiro Sakitani , Takaharu Morikawa
IPC: H01M4/36 , H01M10/0587 , H01M4/38 , H01M4/587 , H01M10/0525
Abstract: 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.
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公开(公告)号：US20210218014A1
公开(公告)日：2021-07-15
申请号：US17267969
申请日：2019-08-01
Inventor： Nobuhiro Sakitani , Takaharu Morikawa
IPC: H01M4/133 , H01M10/0525 , H01M10/0587 , H01M4/131 , H01M4/485
Abstract: A nonaqueous electrolyte secondary battery according to an aspect of the present disclosure includes: an electrode body in which a positive electrode plate and a negative electrode plate are wound with a separator interposed therebetween; and an exterior package which receives the electrode body, the negative electrode plate includes a negative electrode collector, a first negative electrode mixture layer formed on a winding inside first surface of the negative electrode collector, and a second negative electrode mixture layer formed on a winding outside second surface of the negative electrode collector, the first negative electrode mixture layer contains first graphite particles as a primary component, the second negative electrode mixture layer contains second graphite particles as a primary component, and the first graphite particles has an internal void rate lower than an internal void rate of the second graphite particles.
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