Abstract: The present invention discloses a positive electrode sheet, an electrochemical device including the positive electrode sheet, and an electronic device. The positive electrode sheet of the present invention includes a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material includes a ternary positive electrode material containing boron, zirconium and aluminum; the positive electrode sheet satisfies an equation as follows: 11.0?[F101+(DFW/4.5)]×1.85±ln(M)?17.0; where F101 is a half-peak breadth of a diffraction peak of the positive electrode active material at a position of 36.6±1° in an XRD spectrum; DFW is a full width at half maximum of particle size volume distribution of the positive electrode active material; and M is a total mass proportion of the trace elements in the positive electrode active material.

Abstract: The present invention discloses a positive pole piece, an electrochemical device including the positive pole piece, and an electronic device, and falls within the technical field of batteries. The positive pole piece includes a positive current collector and a positive active material layer provided on at least one surface of the positive current collector. The positive active material layer includes a ternary positive active material. The positive pole piece satisfies the following relationship: 1.2?D/(R/5+P/2)?3.5. D is a particle size change rate of Dv50 before and after the positive active material is held for 30 seconds at a pressure of 35 KN, and Dv50 is a particle size corresponding to 50% of a volume cumulative distribution percentage of the positive active material. R is a roughness of the positive pole piece, and P is a porosity of the positive pole piece.