公开(公告)号：US20240413342A1

公开(公告)日：2024-12-12

申请号：US18810764

申请日：2024-08-21

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Tatsuya IKENUMA ,  Takahiro KAWAKAMI ,  Yohei MOMMA ,  Teruaki OCHIAI

IPC: H01M4/62 ,  H01M4/04 ,  H01M4/139 ,  H01M10/052

Abstract: In manufacture of a storage battery electrode containing graphene as a conductive additive, the efficiency of reduction of graphene oxide under mild conditions is increased, and cycle characteristics and rate characteristics of a storage battery are improved. Provided is a manufacturing method of a storage battery electrode. In the manufacturing method, a first mixture containing an active material, graphene oxide, and a solvent is formed; a reducing agent is added to the first mixture and the graphene oxide is reduced to form a second mixture; a binder is mixed with the second mixture to form a third mixture; and the third mixture is applied to a current collector and the solvent is evaporated to form an active material layer.

公开(公告)号：US20240266594A1

公开(公告)日：2024-08-08

申请号：US18562562

申请日：2022-05-24

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Shuhei YOSHITOMI ,  Kaori OGITA ,  Shotaro MURATSUBAKI ,  Atsushi KAWATSUKI ,  Mayumi MIKAMI ,  Yohei MOMMA ,  Tetsuya KAKEHATA ,  Shunpei YAMAZAKI

IPC: H01M10/0562 ,  H01M4/02 ,  H01M4/505 ,  H01M4/525 ,  H01M4/583 ,  H01M10/0525

CPC classification number: H01M10/0562 ,  H01M4/505 ,  H01M4/525 ,  H01M4/583 ,  H01M10/0525 ,  H01M2004/027 ,  H01M2004/028 ,  H01M2220/30

Abstract: Provided is a secondary battery having a favorable interface contact between an active material and an electrolyte. The secondary battery includes a positive electrode layer, a negative electrode layer, and an electrolyte layer positioned between the positive electrode layer and the negative electrode layer. The positive electrode layer contains a positive electrode active material and a first solid electrolyte, the negative electrode layer contains a negative electrode active material and a second solid electrolyte, the electrolyte layer contains a third solid electrolyte and an ionic liquid, and a space in the third solid electrolyte is impregnated with the ionic liquid. The secondary battery is bendable.

公开(公告)号：US20240266515A1

公开(公告)日：2024-08-08

申请号：US18608249

申请日：2024-03-18

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yohei MOMMA ,  Hiroshi KADOMA ,  Yoshihiro KOMATSU ,  Shiori SAGA ,  Shunpei YAMAZAKI

IPC: H01M4/36 ,  H01M4/02 ,  H01M4/485 ,  H01M4/525 ,  H01M4/58 ,  H01M10/0525

CPC classification number: H01M4/366 ,  H01M4/485 ,  H01M4/525 ,  H01M4/582 ,  H01M10/0525 ,  H01M2004/028

Abstract: A positive electrode active material in which a capacity decrease caused by charge and discharge cycles is suppressed is provided. Alternatively, a positive electrode active material having a crystal structure that is unlikely to be broken by repeated charging and discharging is provided. The positive electrode active material contains titanium, nickel, aluminum, magnesium, and fluorine, and includes a region where titanium is unevenly distributed, a region where nickel is unevenly distributed, and a region where magnesium is unevenly distributed in a projection on its surface. Aluminum is preferably unevenly distributed in a surface portion, not in the projection, of the positive electrode active material.

公开(公告)号：US20240186486A1

公开(公告)日：2024-06-06

申请号：US18442450

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：US20240063387A1

公开(公告)日：2024-02-22

申请号：US18449140

申请日：2023-08-14

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Shunpei YAMAZAKI ,  Tetsuya KAKEHATA ,  Shuhei YOSHITOMI ,  Yohei MOMMA ,  Atsushi KAWATSUKI ,  Mayumi MIKAMI ,  Junya MARUYAMA ,  Akio ENDO ,  Kaori OGITA

IPC: H01M4/525 ,  C01G51/00 ,  H01M50/109 ,  H01M4/62 ,  H01M4/66 ,  H01M50/417

CPC classification number: H01M4/525 ,  C01G51/42 ,  H01M50/109 ,  H01M4/625 ,  H01M4/623 ,  H01M4/661 ,  H01M50/417 ,  C01P2002/52 ,  C01P2006/40 ,  C01P2004/61 ,  C01P2004/04 ,  C01P2002/90 ,  C01P2002/77 ,  C01P2002/72

Abstract: A positive electrode active material having a high charge-discharge capacity and high safety and a secondary battery including the positive electrode active material are provided. The positive electrode active material includes lithium, a transition metal M, an additive element, and oxygen. The powder volume resistivity of the positive electrode active material is higher than or equal to 1.0×105 Ω·cm at a temperature of higher than or equal to 180° C. and lower than or equal to 200° C. and at a pressure of higher than or equal to 0.3 MPa and lower than or equal to 2 MPa. The median diameter of the positive electrode active material is preferably greater than or equal to 3 μm and less than or equal to 10 μm.

公开(公告)号：US20240030429A1

公开(公告)日：2024-01-25

申请号：US18251776

申请日：2021-10-28

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Shunpei YAMAZAKI ,  Ryo ARASAWA ,  Shunichi ITO ,  Shiori SAGA ,  Yohei MOMMA ,  Jo SAITO ,  Kunihiko SUZUKI ,  Teppei OGUNI ,  Yuji IWAKI ,  Kanta ABE

IPC: H01M4/525 ,  H01M4/46 ,  H01M10/0525

CPC classification number: H01M4/525 ,  H01M4/463 ,  H01M4/466 ,  H01M10/0525 ,  H01M2004/028

Abstract: A positive electrode active material in which the number of defects that cause deterioration is small or progress of the defect is suppressed is provided. The positive electrode active material is used for a secondary battery. The positive electrode active material contains lithium cobalt oxide containing an additive element. After a cycle test is performed on a cell that uses the positive electrode active material for a positive electrode and a lithium electrode as a counter electrode, the positive electrode active material includes a defect and contains at least the same element as the additive element in a region in the vicinity of the defect. The additive element is contained also in a surface portion of the positive electrode active material.

公开(公告)号：US20230343924A1

公开(公告)日：2023-10-26

申请号：US18203148

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

CPC classification number: H01M4/131 ,  H01M4/1315 ,  H01M4/134 ,  H01M4/1391 ,  H01M4/13915 ,  H01M4/366 ,  H01M4/525 ,  H01M4/625 ,  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：US20230317940A1

公开(公告)日：2023-10-05

申请号：US18019563

申请日：2021-07-26

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Jo Saito ,  Yohei MOMMA ,  Teruaki OCHIAI ,  Yusuke YOSHITANI ,  Mayumi MIKAMI

IPC: H01M4/525 ,  H01M10/0525 ,  H01M4/04 ,  H01M10/0587

CPC classification number: H01M4/525 ,  H01M10/0525 ,  H01M4/0471 ,  H01M4/0416 ,  H01M10/0587 ,  H01M2220/20 ,  H01M2004/028

Abstract: A secondary battery and a positive electrode active material each having high energy density per weight and per volume are provided. The secondary battery includes a positive electrode, the positive electrode includes lithium cobalt oxide, and the lithium cobalt oxide has a projection containing at least one or two or more selected from Hf, V, Nb, Ce, and Sm. The projection may further contain Mg, F, Ni, or Al as an additive element. The secondary battery is manufactured through a step of forming a mixed solution by mixing the lithium cobalt oxide and a metal alkoxide containing one or two or more selected from Hf, V, Nb, Ce, and Sm. With such a positive electrode active material, a secondary battery with a high charge voltage can be provided.

公开(公告)号：US20230299265A1

公开(公告)日：2023-09-21

申请号：US18202480

申请日：2023-05-26

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：US20230052499A1

公开(公告)日：2023-02-16

申请号：US17778538

申请日：2020-11-16

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yoshihiro KOMATSU ,  Shiori SAGA ,  Yohei MOMMA ,  Hiroshi KADOMA ,  Toshikazu OHNO ,  Shunpei YAMAZAKI

IPC: H01M4/525 ,  H01M4/04 ,  C01G53/00

Abstract: Secondary batteries using lithium cobalt oxide as positive electrode active materials have a problem of a decrease in battery capacity due to repeated charging/discharging, for example. A positive electrode active material particle which hardly deteriorates is provided. In a first step, a container in which a lithium oxide and a fluoride are set is placed in a heating furnace, and in a second step, the inside of the heating furnace is heated in an atmosphere containing oxygen. The heating temperature of the second step is from 750° C. to 950° C., inclusive. By the manufacturing method, fluorine can be contained in the positive electrode active material particle to increase the wettability of the surface of the positive electrode active material so that the surface of the positive electrode active material is homogenized and planarized. The crystal structure of the thus manufactured positive electrode active material is unlikely to be broken in repeated high-voltage charging/discharging. Thus, secondary batteries using the positive electrode active material having such a feature have greatly improved cycle characteristics.