Ternary precursor and preparation method thereof, lithium battery positive electrode material and lithium battery

The invention discloses a ternary precursor and a preparation method thereof, a lithium battery positive electrode material and a lithium battery, and relates to the technical field of lithium batteries. A structure-directing agent is added into a base solution, and a hydrogen peroxide solution is introduced as a structure improving agent in a nucleation stage in a hierarchical structure adjustment manner, so that primary particles start to generate weak deformation; a sodium persulfate solution is introduced as a structure improving agent in the stage of continuous growth after nucleation, primary particles of the precursor can be thinned and are distributed on the surface in a staggered manner, and a radial porous structure with fine primary particles is obtained. Compared with the prior art, thin primary particles and large porosity can be obtained, due to the characteristics, the precursor has a large specific surface area, and the number of active sites on the surface of the ternary precursor with the hi