公开(公告)号：US20250167359A1

公开(公告)日：2025-05-22

申请号：US18838429

申请日：2023-02-03

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Yosiharu ASADA ,  Kazutaka KURIKI ,  Yumiko YONEDA ,  Harushi ITO

IPC: H01M50/178 ,  H01M10/0585 ,  H01M50/105 ,  H01M50/121

Abstract: A secondary battery that can inhibit deterioration of an electrode is provided. A flexible secondary battery is provided. The secondary battery includes a positive electrode, a negative electrode, a separator, a first spacer, a second spacer, a positive electrode lead, a negative electrode lead, and an exterior body. The positive electrode includes a first portion coated with a positive electrode active material and a second portion where a positive electrode current collector is exposed. The negative electrode includes a third portion coated with a negative electrode active material and a fourth portion where a negative electrode current collector is exposed. The first portion, the third portion, and the separator overlap with each other in a stacked portion. The positive electrode lead is connected to the second portion in a position overlapping with the stacked portion. The negative electrode lead is connected to the fourth portion in a position overlapping with the stacked portion. The first spacer is in contact with the exterior body in a region surrounded by one end portion of the stacked portion, the positive electrode lead, and the negative electrode lead. The second spacer includes a region interposed between the stacked portion and the second portion, a region interposed between the stacked portion and the fourth portion, and a region connected to the first spacer.

公开(公告)号：US20250087684A1

公开(公告)日：2025-03-13

申请号：US18798072

申请日：2024-08-08

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Shuji FUKAI ,  Kazutaka KURIKI ,  Yumiko YONEDA ,  Yosiharu ASADA ,  Kazuya SHIMADA

IPC: H01M4/525 ,  C01G53/00 ,  H01M4/04 ,  H01M10/0525 ,  H01M10/0569

Abstract: A method for forming a positive electrode active material applicable to a lithium-ion battery having excellent charge and discharge characteristics even in a low-temperature environment is provided. The method for forming a positive electrode active material includes: a first step of heating lithium cobalt oxide with a median diameter of less than or equal to 10 μm; a second step of mixing a fluorine source and a magnesium source with the lithium cobalt oxide subjected to the first step, thereby forming a first mixture; a third step of heating the first mixture; a fourth step of mixing a nickel source and an aluminum source with the first mixture subjected to the third step, thereby forming a second mixture; and a fifth step of heating the second mixture. The third step and the fifth step are performed in a state where the first mixture is held to have a thickness of less than or equal to 2.0 mm in a first setter. The first step, the third step, and the fifth step are performed in an atmosphere containing oxygen.