Coated ternary positive electrode material as well as preparation method and application thereof

The invention provides a coated ternary positive electrode material as well as a preparation method and application thereof. The coated ternary positive electrode material comprises a nickel cobalt lithium manganate core and a coating layer, the chemical formula of the nickel cobalt lithium manganate inner core is LiNi < x > Co < y > Mn < z > M < 1-x-y-z > O < 2 >, and M is a doping element and comprises Ca and/or La; the coating layer is an inert shell co-coated by a metal oxide and a metal fluoride; the preparation method adopts a spray pyrolysis process. According to the preparation method, the particle morphology is accurately controlled, the element distribution uniformity is improved, the electrochemical performance and the cycle performance of the positive electrode material are improved, meanwhile, the manufacturing cost is reduced, the production time is shortened, the adverse effect of the production process on the environment is reduced to the maximum extent, and large-scale popularization and appl