公开(公告)号：US10978692B2

公开(公告)日：2021-04-13

申请号：US16386758

申请日：2019-04-17

申请人： Panasonic Intellectual Property Management Co., Ltd.

发明人： Akira Kano ,  Ryohei Miyamae ,  Kiyohiro Isii ,  Kensuke Nakura

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

摘要： A lithium secondary battery includes an electrode group and a nonaqueous electrolyte having lithium ion conductivity. A negative electrode includes a negative electrode current collector. The negative electrode current collector has a first surface facing an outward direction of winding of the electrode group and a second surface facing an inward direction of the winding of the electrode group. Lithium metal is deposited on the first surface and the second surface by charge. The negative electrode further includes first protrusions protruding from the first surface and second protrusions protruding from the second surface. A ratio A1X/A1 is less than a ratio A2X/A2. A1X is a sum of projected areas of the first protrusions on the first surface. A1 is an area of the first surface. A2X is a sum of projected areas of the second protrusions on the second surface. A2 is an area of the second surface.

公开(公告)号：US10777805B2

公开(公告)日：2020-09-15

申请号：US15869047

申请日：2018-01-12

申请人： Panasonic Intellectual Property Management Co., Ltd.

发明人： Go Tei ,  Ryohei Miyamae ,  Akira Kano

IPC分类号： H01M4/133 ,  H01M4/38 ,  H01M10/052 ,  H01M4/02 ,  H01M10/0525

摘要： A negative electrode active material contains a graphite material represented by a formula CaxByC1-y, where x and y satisfy 0

公开(公告)号：US20240128780A1

公开(公告)日：2024-04-18

申请号：US18274342

申请日：2022-01-21

申请人： Panasonic Intellectual Property Management Co., Ltd.

发明人： Ryohei Miyamae ,  Akira Kano ,  Takahiro Fukuoka

IPC分类号： H02J7/00 ,  H01M10/052 ,  H01M10/44 ,  H01M10/46

CPC分类号： H02J7/00712 ,  H01M10/052 ,  H01M10/44 ,  H01M10/46 ,  H02J7/0048

摘要： A method of charging a secondary battery, the battery including a positive electrode in which a lithium ion is stored during discharging and released during charging, a negative electrode in which a lithium metal deposits during charging and dissolves during discharging, and a non-aqueous electrolyte having a lithium ion conductivity, wherein the method includes a step of charging the secondary battery according to a first charging profile. In the secondary battery, a surface of the negative electrode is covered with a protection layer. In the first charging profile, charging starts from a first charging step in which charging is performed at a constant current with a first electric current density I1, and following the first charging step, a second charging step is performed in which charging is performed at a constant current with a second electric current density I2 that is larger than the first electric current density I1.

公开(公告)号：US11251437B2

公开(公告)日：2022-02-15

申请号：US16389038

申请日：2019-04-19

申请人： Panasonic Intellectual Property Management Co., Ltd.

发明人： Akira Kano ,  Ryohei Miyamae ,  Kiyohiro Isii ,  Kensuke Nakura

IPC分类号： H01M4/70 ,  H01M4/134 ,  H01M4/38 ,  H01M4/66 ,  H01M10/052 ,  H01M10/0587 ,  H01M4/02

摘要： 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 larger than a second area rate.

公开(公告)号：US20240347864A1

公开(公告)日：2024-10-17

申请号：US18292678

申请日：2022-07-27

申请人： Panasonic Intellectual Property Management Co., Ltd.

发明人： Shinichiro Kondo ,  Ryohei Miyamae ,  Akira Kano

IPC分类号： H01M50/477 ,  H01M10/0525 ,  H01M10/0587 ,  H01M50/474 ,  H01M50/486

CPC分类号： H01M50/477 ,  H01M10/0525 ,  H01M10/0587 ,  H01M50/474 ,  H01M50/486

摘要： A lithium secondary battery includes a positive electrode, a negative electrode facing the positive electrode, a separator disposed between the positive electrode and the negative electrode, a nonaqueous electrolyte having lithium ion conductivity, and a spacer disposed between the negative electrode and the separator. Lithium metal deposits on the negative electrode during charging and the lithium metal dissolves from the negative electrode during discharging. The spacer has a plurality of spot-like projection portions.

公开(公告)号：US20220407047A1

公开(公告)日：2022-12-22

申请号：US17638545

申请日：2020-07-28

申请人： Panasonic Intellectual Property Management Co. Ltd.

发明人： Akira Kano ,  Ryohei Miyamae

IPC分类号： H01M4/134 ,  H01M4/62 ,  H01M10/0569 ,  H01M10/0525

摘要： A lithium secondary battery includes a positive electrode, a negative electrode, a lithium ion conductive nonaqueous electrolyte, and a separator disposed between the positive electrode and the negative electrode. On the negative electrode, lithium metal deposits during charging, and the lithium metal is dissolved during discharging; the negative electrode includes a negative electrode current collector, and a plurality of layers stacked on the negative electrode current collector; the plurality of layers include a first layer, a second layer, and a third layer; of the first to third layers, the first layer is closest to the negative electrode current collector, and the third layer is farthest from the negative electrode current collector; the first layer contains a material capable of storing lithium ions; the second layer contains lithium metal, and the third layer has an insulation property and a lithium ion permeability.

公开(公告)号：US11177481B2

公开(公告)日：2021-11-16

申请号：US16392573

申请日：2019-04-23

申请人： Panasonic Intellectual Property Management Co., Ltd.

发明人： Ryohei Miyamae ,  Akira Kano ,  Kensuke Nakura

IPC分类号： H01M4/70 ,  H01M4/66 ,  H01M10/052 ,  H01M4/02

摘要： A lithium secondary battery includes a positive electrode, negative electrode, a separator, and a nonaqueous electrolyte having lithium-ion conductivity. The positive electrode contains a positive electrode active material containing lithium. The negative electrode faces the positive electrode. The separator is disposed between the positive and negative electrodes. The negative electrode includes a negative electrode current collector. The negative electrode current collector includes a layer having a first surface, and protrusions protruding from the first surface. The first surface is a surface on which lithium metal is deposited during charge. The protrusions do not divide the first surface into parts.

公开(公告)号：US10923731B2

公开(公告)日：2021-02-16

申请号：US16384426

申请日：2019-04-15

申请人： Panasonic Intellectual Property Management Co., Ltd.

发明人： Akira Kano ,  Ryohei Miyamae ,  Kiyohiro Isii ,  Kensuke Nakura

IPC分类号： H01M4/78 ,  H01M4/38 ,  H01M10/052 ,  H01M10/0587 ,  H01M4/02

摘要： 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 smaller than a second average height of the inner-circumference-side protrusions.

公开(公告)号：US20230369639A1

公开(公告)日：2023-11-16

申请号：US18029212

申请日：2021-09-27

申请人： Panasonic Intellectual Property Management Co., Ltd.

发明人： Ryohei Miyamae ,  Akira Kano

IPC分类号： H01M10/0525 ,  H01M4/62 ,  H01M4/66

CPC分类号： H01M10/0525 ,  H01M4/623 ,  H01M4/667 ,  H01M4/131

摘要： A lithium secondary battery includes: a positive electrode that absorbs lithium ions during discharging and releases the lithium ions during charging; a negative electrode on which lithium metal is deposited during charging and from which the lithium metal dissolves during discharging; and a non-aqueous electrolyte that has lithium ion conductivity. A surface of the negative electrode is covered with a protective layer that contains a resin material and inorganic particles having a density of 6 g/cm3 or more.

公开(公告)号：US10923711B2

公开(公告)日：2021-02-16

申请号：US16391370

申请日：2019-04-23

申请人： Panasonic Intellectual Property Management Co., Ltd.

发明人： Akira Kano ,  Ryohei Miyamae ,  Kiyohiro Isii ,  Kensuke Nakura

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

摘要： 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.