Positive electrode active material and positive plate and battery comprising positive electrode active material

The invention relates to a positive electrode active material, a positive plate comprising the positive electrode active material and a battery, belongs to the technical field of batteries, and particularly belongs to the field of quasi-solid-state batteries. The organic acid monomer is added in the preparation process of the pole piece, so that the content of alkaline substances on the surface of the ternary material can be effectively reduced, gas production of the ternary material in the battery is reduced, and the cycling stability of the pole piece in the battery is improved. The organic acid monomer is tightly combined on the surface of the ternary material through the reaction of the organic acid monomer and the ternary material, and participates in the curing reaction when the quasi-solid-state battery is formed through in-situ curing, so that the ternary material and the solid electrolyte have a closer contact interface, and the stability of the battery in circulation is improved. 本发明涉及一种正极活性材料及包括该正极