公开(公告)号：US20230327088A1

公开(公告)日：2023-10-12

申请号：US18204439

申请日：2023-06-01

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takahiro KAWAKAMI ,  Teruaki OCHIAI ,  Yohei MOMMA ,  Ayae TSURUTA ,  Masahiro Takahashi ,  Mayumi MIKAMI

IPC: H01M4/36 ,  H01M4/04 ,  H01M4/62 ,  H01G11/24 ,  H01G11/86 ,  H01G11/50 ,  H01G11/60 ,  H01M4/505 ,  H01M4/525

CPC classification number: H01M4/366 ,  H01M4/0471 ,  H01M4/62 ,  H01G11/24 ,  H01G11/86 ,  H01M10/0525 ,  H01G11/60 ,  H01M4/505 ,  H01M4/525 ,  H01M4/628 ,  H01G11/50

Abstract: Provided is a positive electrode active material which suppresses a reduction in capacity due to charge and discharge cycles when used in a lithium ion secondary battery. A covering layer is formed by segregation on a superficial portion of the positive electrode active material. The positive electrode active material includes a first region and a second region. The first region exists in an inner portion of the positive electrode active material. The second region exists in a superficial portion of the positive electrode active material and part of the inner portion thereof. The first region includes lithium, a transition metal, and oxygen. The second region includes magnesium, fluorine, and oxygen.

公开(公告)号：US20230290926A1

公开(公告)日：2023-09-14

申请号：US18200204

申请日：2023-05-22

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Teruaki OCHIAI ,  Takahiro KAWAKAMI ,  Mayumi MIKAMI ,  Yohei MOMMA ,  Masahiro TAKAHASHI ,  Ayae TSURUTA

IPC: H01M4/131 ,  H01M4/1315 ,  H01M4/1391 ,  H01M4/62 ,  H01M4/13915 ,  H01M4/134 ,  H01M4/36 ,  H01M4/525 ,  H01M4/86

CPC classification number: H01M4/131 ,  H01M4/1315 ,  H01M4/1391 ,  H01M4/625 ,  H01M4/13915 ,  H01M4/134 ,  H01M4/366 ,  H01M4/525 ,  H01M4/8657 ,  H01M2004/021

Abstract: A positive electrode active material which can improve cycle characteristics of a secondary battery is provided. Two kinds of regions are provided in a superficial portion of a positive electrode active material such as lithium cobaltate which has a layered rock-salt crystal structure. The inner region is a non-stoichiometric compound containing a transition metal such as titanium, and the outer region is a compound of representative elements such as magnesium oxide. The two kinds of regions each have a rock-salt crystal structure. The inner layered rock-salt crystal structure and the two kinds of regions in the superficial portion are topotaxy; thus, a change of the crystal structure of the positive electrode active material generated by charging and discharging can be effectively suppressed. In addition, since the outer coating layer in contact with an electrolyte solution is the compound of representative elements which is chemically stable, the secondary battery having excellent cycle characteristics can be obtained.

公开(公告)号：US20210020910A1

公开(公告)日：2021-01-21

申请号：US17064724

申请日：2020-10-07

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Teruaki OCHIAI ,  Takahiro KAWAKAMI ,  Mayumi MIKAMI ,  Yohei MOMMA ,  Masahiro TAKAHASHI ,  Ayae TSURUTA

IPC: H01M4/134 ,  H01M4/131 ,  H01M4/525 ,  H01M4/36 ,  H01M10/0525

Abstract: A positive electrode active material which can improve cycle characteristics of a secondary battery is provided. Two kinds of regions are provided in a superficial portion of a positive electrode active material such as lithium cobaltate which has a layered rock-salt crystal structure. The inner region is a non-stoichiometric compound containing a transition metal such as titanium, and the outer region is a compound of representative elements such as magnesium oxide. The two kinds of regions each have a rock-salt crystal structure. The inner layered rock-salt crystal structure and the two kinds of regions in the superficial portion are topotaxy; thus, a change of the crystal structure of the positive electrode active material generated by charging and discharging can be effectively suppressed. In addition, since the outer coating layer in contact with an electrolyte solution is the compound of representative elements which is chemically stable, the secondary battery having excellent cycle characteristics can be obtained.

公开(公告)号：US20200343530A1

公开(公告)日：2020-10-29

申请号：US16923494

申请日：2020-07-08

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Teruaki OCHIAI ,  Takahiro KAWAKAMI ,  Mayumi MIKAMI ,  Yohei MOMMA ,  Masahiro TAKAHASHI ,  Ayae TSURUTA

IPC: H01M4/131 ,  H01M4/1315 ,  H01M4/1391 ,  H01M4/62 ,  H01M4/13915 ,  H01M4/86

Abstract: A positive electrode active material which can improve cycle characteristics of a secondary battery is provided. Two kinds of regions are provided in a superficial portion of a positive electrode active material such as lithium cobaltate which has a layered rock-salt crystal structure. The inner region is a non-stoichiometric compound containing a transition metal such as titanium, and the outer region is a compound of representative elements such as magnesium oxide. The two kinds of regions each have a rock-salt crystal structure. The inner layered rock-salt crystal structure and the two kinds of regions in the superficial portion are topotaxy; thus, a change of the crystal structure of the positive electrode active material generated by charging and discharging can be effectively suppressed. In addition, since the outer coating layer in contact with an electrolyte solution is the compound of representative elements which is chemically stable, the secondary battery having excellent cycle characteristics can be obtained.

公开(公告)号：US20240266502A1

公开(公告)日：2024-08-08

申请号：US18442424

申请日：2024-02-15

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Masahiro TAKAHASHI ,  Teruaki OCHIAI ,  Yohei MOMMA ,  Ayae TSURUTA

IPC: H01M4/36 ,  H01M4/02 ,  H01M4/505 ,  H01M4/525

CPC classification number: H01M4/364 ,  H01M4/505 ,  H01M4/525 ,  H01M2004/028

Abstract: A positive electrode active material particle with little deterioration is provided. A power storage device with little deterioration is provided. A highly safe power storage device is provided. The positive electrode active material particle includes a first crystal grain, a second crystal grain, and a crystal grain boundary positioned between the crystal grain and the second crystal grain; the first crystal grain and the second crystal grain include lithium, a transition metal, and oxygen; the crystal grain boundary includes magnesium and oxygen; and the positive electrode active material particle includes a region where the ratio of the atomic concentration of magnesium in the crystal grain boundary to the atomic concentration of the transition metal in first crystal grain and the second crystal grain is greater than or equal to 0.010 and less than or equal to 0.50.

公开(公告)号：US20230327073A1

公开(公告)日：2023-10-12

申请号：US18203085

申请日：2023-05-30

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Teruaki OCHIAI ,  Takahiro KAWAKAMI ,  Mayumi MIKAMI ,  Yohei MOMMA ,  Masahiro TAKAHASHI ,  Ayae TSURUTA

IPC: H01M4/131 ,  H01M4/1315 ,  H01M4/1391 ,  H01M4/62 ,  H01M4/13915 ,  H01M4/134 ,  H01M4/36 ,  H01M4/525 ,  H01M4/86

CPC classification number: H01M4/131 ,  H01M4/1315 ,  H01M4/1391 ,  H01M4/625 ,  H01M4/13915 ,  H01M4/134 ,  H01M4/366 ,  H01M4/525 ,  H01M4/8657 ,  H01M2004/021

Abstract: A positive electrode active material which can improve cycle characteristics of a secondary battery is provided. Two kinds of regions are provided in a superficial portion of a positive electrode active material such as lithium cobaltate which has a layered rock-salt crystal structure. The inner region is a non-stoichiometric compound containing a transition metal such as titanium, and the outer region is a compound of representative elements such as magnesium oxide. The two kinds of regions each have a rock-salt crystal structure. The inner layered rock-salt crystal structure and the two kinds of regions in the superficial portion are topotaxy; thus, a change of the crystal structure of the positive electrode active material generated by charging and discharging can be effectively suppressed. In addition, since the outer coating layer in contact with an electrolyte solution is the compound of representative elements which is chemically stable, the secondary battery having excellent cycle characteristics can be obtained.

公开(公告)号：US20230299274A1

公开(公告)日：2023-09-21

申请号：US18201818

申请日：2023-05-25

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takahiro KAWAKAMI ,  Teruaki OCHIAI ,  Yohei MOMMA ,  Ayae TSURUTA ,  Masahiro Takahashi ,  Mayumi MIKAMI

IPC: H01M4/36 ,  H01M4/04 ,  H01M4/62 ,  H01G11/24 ,  H01G11/86 ,  H01G11/50 ,  H01G11/60 ,  H01M4/505 ,  H01M4/525

CPC classification number: H01M4/366 ,  H01M4/0471 ,  H01M4/62 ,  H01G11/24 ,  H01G11/86 ,  H01G11/50 ,  H01G11/60 ,  H01M4/505 ,  H01M4/525 ,  H01M4/628 ,  H01M10/0525

Abstract: Provided is a positive electrode active material which suppresses a reduction in capacity due to charge and discharge cycles when used in a lithium ion secondary battery. A covering layer is formed by segregation on a superficial portion of the positive electrode active material. The positive electrode active material includes a first region and a second region. The first region exists in an inner portion of the positive electrode active material. The second region exists in a superficial portion of the positive electrode active material and part of the inner portion thereof. The first region includes lithium, a transition metal, and oxygen. The second region includes magnesium, fluorine, and oxygen.

公开(公告)号：US20180102536A1

公开(公告)日：2018-04-12

申请号：US15726520

申请日：2017-10-06

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Takahiro KAWAKAMI ,  Teruaki OCHIAI ,  Yohei MOMMA ,  Ayae TSURUTA ,  Masahiro TAKAHASHI ,  Mayumi MIKAMI

IPC: H01M4/36 ,  H01M4/525 ,  H01M10/0525 ,  H01M4/505 ,  H01M4/62 ,  H01G11/60 ,  H01G11/50

CPC classification number: H01M4/366 ,  H01G11/24 ,  H01G11/50 ,  H01G11/60 ,  H01G11/86 ,  H01M4/0471 ,  H01M4/505 ,  H01M4/525 ,  H01M4/62 ,  H01M4/628 ,  H01M10/0525 ,  H01M2004/028

Abstract: Provided is a positive electrode active material which suppresses a reduction in capacity due to charge and discharge cycles when used in a lithium ion secondary battery. A covering layer is formed by segregation on a superficial portion of the positive electrode active material. The positive electrode active material includes a first region and a second region. The first region exists in an inner portion of the positive electrode active material. The second region exists in a superficial portion of the positive electrode active material and part of the inner portion thereof. The first region includes lithium, a transition metal, and oxygen. The second region includes magnesium, fluorine, and oxygen.

公开(公告)号：US20240243255A1

公开(公告)日：2024-07-18

申请号：US18442470

申请日：2024-02-15

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Masahiro TAKAHASHI ,  Teruaki OCHIAI ,  Yohei MOMMA ,  Ayae TSURUTA

IPC: H01M4/36 ,  H01M4/505 ,  H01M4/525 ,  H01M4/02

CPC classification number: H01M4/364 ,  H01M4/505 ,  H01M4/525 ,  H01M2004/028

Abstract: A positive electrode active material particle with little deterioration is provided. A power storage device with little deterioration is provided. A highly safe power storage device is provided. The positive electrode active material particle includes a first crystal grain, a second crystal grain, and a crystal grain boundary positioned between the crystal grain and the second crystal grain; the first crystal grain and the second crystal grain include lithium, a transition metal, and oxygen; the crystal grain boundary includes magnesium and oxygen; and the positive electrode active material particle includes a region where the ratio of the atomic concentration of magnesium in the crystal grain boundary to the atomic concentration of the transition metal in first crystal grain and the second crystal grain is greater than or equal to 0.010 and less than or equal to 0.50.

公开(公告)号：US20220115637A1

公开(公告)日：2022-04-14

申请号：US17560408

申请日：2021-12-23

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Teruaki OCHIAI ,  Takahiro KAWAKAMI ,  Mayumi MIKAMI ,  Yohei MOMMA ,  Masahiro TAKAHASHI ,  Ayae TSURUTA

IPC: H01M4/131 ,  H01M4/1315 ,  H01M4/1391 ,  H01M4/62 ,  H01M4/13915 ,  H01M4/134 ,  H01M4/36 ,  H01M4/525 ,  H01M4/86

Abstract: A positive electrode active material which can improve cycle characteristics of a secondary battery is provided. Two kinds of regions are provided in a superficial portion of a positive electrode active material such as lithium cobaltate which has a layered rock-salt crystal structure. The inner region is a non-stoichiometric compound containing a transition metal such as titanium, and the outer region is a compound of representative elements such as magnesium oxide. The two kinds of regions each have a rock-salt crystal structure. The inner layered rock-salt crystal structure and the two kinds of regions in the superficial portion are topotaxy; thus, a change of the crystal structure of the positive electrode active material generated by charging and discharging can be effectively suppressed. In addition, since the outer coating layer in contact with an electrolyte solution is the compound of representative elements which is chemically stable, the secondary battery having excellent cycle characteristics can be obtained.