公开(公告)号：US20230055667A1

公开(公告)日：2023-02-23

申请号：US17793194

申请日：2021-01-21

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

IPC: H01M4/525 ,  C01G53/00

Abstract: A positive electrode active material with little deterioration is provided. Positive electrode active material particles with little deterioration are provided. A power storage device with little deterioration is provided. A highly safe power storage device is provided. A novel power storage device is provided. A secondary battery includes a positive electrode and a negative electrode. In the secondary battery, the positive electrode includes a positive electrode active material; the positive electrode active material includes a crystal exhibiting a layered rock-salt crystal structure; the crystal is represented by the space group R-3m; the positive electrode active material is a particle containing lithium, cobalt, titanium, magnesium, and oxygen; the concentration of the magnesium in a surface portion of the particle is higher than the concentration of the magnesium in an inner portion of the particle; and in the positive electrode active material, the concentration of the titanium in the surface portion of the particle is higher than the concentration of the titanium in the inner portion of the particle.

公开(公告)号：US20230378459A1

公开(公告)日：2023-11-23

申请号：US18248103

申请日：2021-10-13

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kazutaka KURIKI ,  Yumiko YONEDA ,  Shiori SAGA ,  Yoshiharu ASADA ,  Shunpei YAMAZAKI

IPC: H01M4/525 ,  H01M10/44 ,  H01M4/583 ,  H01M10/0569 ,  H01M4/133 ,  C07D233/58

CPC classification number: H01M4/525 ,  H01M10/44 ,  H01M4/583 ,  H01M10/0569 ,  H01M4/133 ,  C07D233/58 ,  H01M2004/028

Abstract: A lithium-ion secondary battery having high capacity and excellent charge and discharge cycle performance is provided. A secondary battery having high capacity is provided. A secondary battery with excellent charge and discharge characteristics is provided. A secondary battery in which a reduction in capacity is suppressed even when a state being charged with a high voltage is held for a long time is provided. In the secondary battery, after constant current charging is performed in an environment at 60° C. with a current value of 0.5 C until a voltage reaches 4.5 V, a charging process of performing constant voltage charging until a current value reaches 0.2 C and a discharging process of performing constant current discharging with a current value of 0.5 C until a voltage reaches 3 V are alternately repeated 150 or more times, and then discharging is performed, lithium cobalt oxide that is a surface portion of the positive electrode active material particle has an O3 structure, and an electrolyte includes an imidazolium cation.

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：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：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.

公开(公告)号：US20210167368A1

公开(公告)日：2021-06-03

申请号：US16952189

申请日：2020-11-19

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

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

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

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.