Positive electrode sheet, positive electrode sheet preparation method, secondary lithium battery, and battery pack

Abstract

The present application provides a positive electrode sheet, a positive electrode sheet preparation method, a secondary lithium battery, and a battery pack. The positive electrode sheet comprises a positive electrode coating layer. The positive electrode coating layer comprises a positive electrode active material and a conductive agent. Performance parameters of the positive electrode active material and the conductive agent satisfy a relationship expressed in Equation (I), and 0.3 < Z ≤ 1. Z is a conductivity of the positive electrode coating layer, S1 is a specific surface area of the positive electrode active material, S2 is a specific surface area of the conductive agent, R is a resistivity of the conductive agent, and n is a specific gravity of the conductive agent in the positive electrode coating layer. When the performance parameters of the positive electrode active material and the conductive agent satisfy the relationship expressed in Equation (I), and the conductivity of the positive electrode coating layer is greater than 0.3 and less than or equal to 1, the positive electrode coating layer of the positive electrode sheet further increases a specific gravity of the active material in the positive electrode coating layer while ensuring conductivity.

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