Tantalum-doped modified positive electrode material and preparation method and application thereof

The invention provides a tantalum-doped modified positive electrode material as well as a preparation method and application thereof. The chemical general formula of the positive electrode material is LiNi (1-y) TayO2Fx, wherein x is not less than 0.01 and not more than 0.03, and y is not less than 0.005 and not more than 0.02. The positive electrode material disclosed by the invention has relatively high cycling stability, rate capability and durability. 本发明提供了一种钽掺杂改性正极材料及其制备方法和应用，所述正极材料的化学通式为：LiNi1-yTayO2Fx；其中，0.01≤x≤0.03，0.005≤y≤0.02。本发明所述正极材料具有较高的循环稳定性、倍率性、耐久性。