公开(公告)号：US20210143440A1

公开(公告)日：2021-05-13

申请号：US17123268

申请日：2020-12-16

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Xin LIU ,  Qisen Huang ,  Shiwen Wang ,  Xianghui Liu ,  Jia Peng ,  Mingling Li ,  Changliang Sheng

IPC: H01M4/66 ,  H01M10/0525 ,  H01M10/0569 ,  H01M10/0567 ,  H01M4/587 ,  H01M4/58 ,  H01M4/133 ,  H01M4/136 ,  H01M4/62 ,  C07C317/12

Abstract: This application discloses a lithium-ion secondary battery. The lithium-ion secondary battery includes a positive electrode plate, a negative electrode plate, a separator, and an electrolytic solution. The positive electrode plate includes a positive electrode current collector and a positive active material layer disposed on a surface of the positive electrode current collector and containing a positive active material, and the negative electrode plate includes a negative electrode current collector and a negative active material layer disposed on a surface of the negative electrode current collector and containing a negative active material; wherein the positive active material includes lithium iron phosphate, and the negative active material includes graphite; and wherein the positive electrode current collector and/or the negative electrode current collector is a composite current collector, and the composite current collector includes an organic support layer and a conductive layer disposed on at least one surface of the organic support layer.