公开(公告)号：US11114659B2

公开(公告)日：2021-09-07

申请号：US16973903

申请日：2019-10-14

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Meng Kang ,  Yuliang Shen ,  Jiazheng Wang ,  Libing He

IPC: H01M4/36 ,  H01M4/505 ,  H01M4/525 ,  H01M4/134 ,  H01M4/133 ,  H01M10/0525 ,  H01M4/02

Abstract: The present application provides a negative electrode sheet and a secondary battery. The negative electrode sheet includes a negative current collector and a negative electrode film provided on at least one surface of the negative current collector and comprising a negative active substance. The negative electrode sheet also satisfies: 0.3≤a×(1.1/b+0.02×c)≤6.0, where a represents the specific surface area of the negative electrode film, and the unit is m2/g; b represents the compaction density of the negative electrode film, and the unit is g/cm3; c represents the cohesive force between the negative electrode film and the negative current collector, and the unit is N/m. The present application can make the negative electrode sheet have excellent dynamics performance, and meanwhile ensure that the secondary battery has good dynamics performance and cycle performance without sacrificing energy density.