POSITIVE ELECTRODE PLATE, AND ELECTROCHEMICAL APPARATUS AND ELECTRONIC APPARATUS CONTAINING SUCH POSITIVE ELECTRODE PLATE

A positive electrode plate includes a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector, where the positive electrode active material layer includes two respective positive electrode active materials represented by chemical formula (1) and chemical formula (2): LiNaCoAlMgTiMO(1), where in chemical formula (1), M includes at least one of Zr, La, or Y, −0.1