Positive pole piece, electrode assembly, battery monomer, battery and electric equipment

The invention discloses a positive pole piece, an electrode assembly, a battery monomer, a battery and electric equipment, the positive pole piece comprises a positive current collector, a positive active material layer located on the surface of the positive current collector and a functional layer connected to the positive active material layer, the positive active material layer comprises a Li-containing active material and a Na-containing active material, the mass ratio P1 of the Na-containing active material to the Li-containing active material is more than or equal to 0.02 and less than or equal to 50. According to the positive pole piece, the Li-containing active material and the Na-containing active material are matched on the positive active material layer, so that the positive pole piece has relatively high energy density and low-temperature capacity retention rate.