Abstract: Provided are a piezoelectric composite material, an actuator, and a preparation method of the actuator, relating to the technical field of piezoelectric composite material actuators. The piezoelectric composite material includes an upper interdigital electrode layer, a piezoelectric fiber composite layer and a lower interdigital electrode layer which are arranged in sequence from top to bottom. The upper interdigital electrode layer, the piezoelectric fiber composite layer and the lower interdigital electrode layer each are of a parallelogram structure. A piezoelectric ceramic fiber array is embedded on the piezoelectric fiber composite layer; and the piezoelectric ceramic fiber array is of a parallelogram structure. By arranging the piezoelectric ceramic fiber array of the parallelogram structure, the effective area of an actuator can be increased, and then the actuation performance of the actuator can be improved.

Abstract: A cathode current collector includes a plastic film, an adhesive strength enhancement layer, a copper metal layer, and an antioxidant layer. The plastic film includes an upper surface and a lower surface. Each of the upper surface and the lower surface of the plastic film is sequentially plated with the adhesive strength enhancement layer, the copper metal layer, and the antioxidant layer. The copper metal layer is plated between the adhesive strength enhancement layer and the antioxidant layer. A method of preparing the cathode current collector and a battery comprising the cathode current collector are also provided.