MULTI-ELEMENT REGIONALLY DOPED COBALT-FREE POSITIVE ELECTRTODE MATERIAL AND A METHOD OF PREPARING THE SAME

The present invention provides a multi-element, regionally doped, cobalt-free positive electrode material, which has a molecular formula of LixNiaMnbAlcMgdWeO2, wherein 0.95≤x≤1.1, 0.5≤a≤0.9, 0.1≤b≤0.5, 0≤c≤0.01, 0≤d≤0.01, 0≤e≤0.01, and a+b=1. The positive electrode material comprises an Al-doped region, an Mg-doped region and a W-doped region in an order from the inside to the outside. Also provided is a method of preparing the positive electrode material. The cobalt-free positive electrode material of the present invention can better adapt to a stress release by the positive electrode material regionally doped with Al, Mg, and W elements, achieving a moderate adjustment and avoiding imbalance, so that the material has more stable structure, and better rate performance and cycle performance. The method of preparing the material has a simple process, is easy to implement, and can stably prepare a positive electrode material with excellent structure and performance.