公开(公告)号：US10923711B2

公开(公告)日：2021-02-16

申请号：US16391370

申请日：2019-04-23

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Akira Kano ,  Ryohei Miyamae ,  Kiyohiro Isii ,  Kensuke Nakura

IPC: H01M4/131 ,  H01M4/134 ,  H01M4/66 ,  H01M4/70 ,  H01M10/0525 ,  H01M10/0565 ,  H01M4/02

Abstract: A lithium secondary battery comprises an electrode group and a nonaqueous electrolyte having lithium-ion conductivity. A negative electrode current collector has a first surface facing outward of winding of the electrode group and a second surface facing inward of the winding of the electrode group. At least the first surface or the second surface includes a first region and a second region that is closer to an innermost circumference of the winding of the electrode group than the first region. Protrusions include outer-circumference-side protrusions disposed on the first region and inner-circumference-side protrusions disposed on the second region. In at least the first surface or the second surface, a first area rate is smaller than a second area rate.

公开(公告)号：US10916810B2

公开(公告)日：2021-02-09

申请号：US16383219

申请日：2019-04-12

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Akira Kano ,  Kiyohiro Isii ,  Ryohei Miyamae ,  Kensuke Nakura

IPC: H01M10/0587 ,  H01M4/134 ,  H01M4/38 ,  H01M10/052 ,  H01M4/02

Abstract: A lithium secondary battery comprises an electrode group and a nonaqueous electrolyte having lithium-ion conductivity. A negative electrode current collector has a first surface facing outward of winding of the electrode group and a second surface facing inward of the winding of the electrode group. At least the first surface or the second surface includes a first region and a second region that is closer to an innermost circumference of the winding of the electrode group than the first region. Protrusions include outer-circumference-side protrusions disposed on the first region and inner-circumference-side protrusions disposed on the second region. A first average height of the outer-circumference-side protrusions is larger than a second average height of the inner-circumference-side protrusions.

公开(公告)号：US10804572B2

公开(公告)日：2020-10-13

申请号：US16254558

申请日：2019-01-22

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Akira Kano ,  Ryohei Miyamae ,  Kiyohiro Isii ,  Junichi Sakamoto

IPC: H01M10/0587 ,  H01M2/26 ,  H01M4/131 ,  H01M4/66 ,  H01M10/0525 ,  H01M4/76 ,  H01M4/70 ,  H01M4/04 ,  H01M10/052 ,  H01M4/139

Abstract: A lithium secondary battery includes a wound electrode group and a lithium-ion conductive nonaqueous electrolyte. The wound electrode group includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode. The negative electrode includes a negative electrode current collector. The negative electrode current collector includes: a layer having a first surface facing outward of the winding of the electrode group and a second surface facing inward of the winding of the electrode group; first protrusions protruding from the first surface; and second protrusions protruding from the second surface. Lithium metal is deposited on the first surface and the second surface by charging. A first average height of the first protrusions is higher than a second average height of the second protrusions.

公开(公告)号：US10680243B2

公开(公告)日：2020-06-09

申请号：US16026047

申请日：2018-07-03

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Akira Kano ,  Ryohei Miyamae ,  Kensuke Nakura

IPC: H01M4/583 ,  H01M10/0525 ,  H01M10/0562 ,  H01M4/58 ,  H01M4/133 ,  H01M4/136 ,  H01M4/66 ,  H01M4/587 ,  H01M4/36 ,  H01M4/02

Abstract: A negative electrode active material includes a plurality of layers and lithium located between the plurality of layers, each of the plurality of layers containing carbon and boron, and nitrogen or phosphorus, wherein a molar ratio of the boron to the carbon is more than 0.6.