公开(公告)号：US20220278323A1

公开(公告)日：2022-09-01

申请号：US17630346

申请日：2020-06-18

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Katsuya Inoue ,  Takeshi Ogasawara

IPC: H01M4/525

Abstract: A secondary battery with a positive electrode comprises, as a positive electrode active material, a lithium-transition metal compound oxide containing Ni, Nb, and an optional component, Co. The content of Ni in the lithium-transition metal compound oxide is 80 mol % or more relative to the total molar number of metallic elements excluding Li, the content of Nb is 0.35 mol % or less relative to the total molar number of metallic elements excluding Li, and the content of Co is 5 mol % or less relative to the total molar number of metallic elements excluding Li. A negative electrode has a negative electrode mixture layer containing a negative electrode active material, and a film containing Nb formed on a surface of the negative electrode mixture layer. The content of Nb in the film relative to the total mass of the negative electrode mixture layer and the film is 10 to 3000 ppm.