Patent ID: 11901561
Assignee: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A positive electrode sheet for a secondary battery, comprising:
a current collector comprising a coating region and a non-coating region other than the coating region;
a resistance layer disposed on the current collector and comprising a conductive agent, a first binder, and a first positive electrode active material; and
a positive electrode active material layer comprising a second positive electrode active material, a conductive agent, and a second binder;
wherein:
a resistance of the resistance layer is greater than a resistance of the positive electrode active material layer;
in a cross section of the positive electrode sheet, a projection of at least a part of the positive electrode active material layer on the current collector and a projection of the resistance layer on the current collector do not overlap, and
a polarization parameter P of the positive electrode sheet is in a range of 0.4-65.0, and the polarization parameter P=((1−S)/S)·(R1/R2), wherein S is an area ratio of the resistance layer relative to the coating region of the current collector, R1 is a film resistance value of the positive electrode sheet in a part where the resistance layer is provided, and R2 is a film resistance value of the positive electrode sheet in a part of the coating region where the resistance layer is not provided.