POSITIVE ELECTRODE MATERIAL AND PREPARATION METHOD THEREFOR

The present disclosure relates to a positive electrode material and the preparation method therefor. The positive electrode material in accordance with the present disclosure is in a form of secondary particles having a core and a shell, wherein the core has a porosity greater than that of the shell. By forming larger particle voids in the cores of secondary particles, the present invention may reduce the stress concentration due to the volume deformation during the lithium ion intercalation/deintercalation, and improve the stability, rate performance, safety and cycle life of the material, which makes the material particularly suitable for lithium-ion batteries of high energy density.