Positive electrode material and preparation method and application thereof

The invention provides a positive electrode material and a preparation method and application thereof. The positive electrode material is of an alpha-NaFeO2 structure, a chemical general formula of the positive electrode material is LixCo1-yAlzM1mM2nO2, M1 is Ni and/or Mn, M2 is any one or a combination of at least two of Mg, Ti, Y, La, Zr, B, Nb, W, Sr, F, P or Ce, x is more than 0.98 and less than 1.04, y is more than 0 and less than 0.06, z is more than 0.005 and less than 0.05, m is more than 0.001 and less than 0.02, and n is more than 0 and less than 0.05. According to the positive electrode material, the positive electrode material is subjected to multi-element, multi-point, uniform and appropriate doping combination, so energy density, power density and fast charge characteristic of a battery under high working voltage can be remarkably improved on the premise of ensuring safety of the battery, and the high-temperature storage, high-temperature floating charge, low-temperature discharge and high-tempe