Anion-cation co-doped lithium cobalt oxide positive electrode material as well as preparation method and application thereof

The invention discloses an anion-cation co-doped lithium cobalt oxide positive electrode material as well as a preparation method and application thereof, cobaltosic oxide is taken as a precursor, and the anion-cation co-doped lithium cobalt oxide positive electrode material is prepared by doping two elements of yttrium and fluorine. The method comprises the following steps: (1) adding a yttrium source, a fluorine source and a precursor cobaltosic oxide into absolute ethyl alcohol, and carrying out oil bath evaporation to dryness to obtain a yttrium and fluorine pre-coated precursor; and (2) mixing the pre-coated precursor with lithium carbonate, and performing high-temperature sintering synthesis to obtain the yttrium and fluorine anion-cation co-doped modified lithium cobalt oxide positive electrode material. The lithium cobalt oxide positive electrode material prepared by the method is improved in structural stability, and the cycling stability and the rate capability of the lithium cobalt oxide positive e