Composite positive electrode material and preparation method and application thereof

The invention relates to a composite positive electrode material and a preparation method and application thereof. In the preparation method of the composite positive electrode material, a precursor A and a boron-containing precursor B are alternately subjected to atomic layer deposition on the same surface of a positive electrode active material to prepare the composite positive electrode material; the temperature of atomic layer deposition ranges from 30 DEG C to 500 DEG C, and the pressure ranges from 0.1 Pa to 1000 Pa; the precursor A is at least one of an oxygen simple substance, an oxygen-containing inorganic substance and a metal organic compound; the boron-containing precursor B is boric acid ester. 本发明涉及一种复合正极材料及其制备方法与应用。该复合正极材料的制备方法中，分别采用前驱体A和含硼前驱体B在正极活性材料的同一表面交替进行原子层沉积，制备复合正极材料；所述原子层沉积的温度为30℃～500℃，压力为0.1Pa～1000Pa；所述前驱体A为氧单质、含氧无机物及金属有机化合物中的至少一种；所述含硼前驱体B为硼酸酯。