O3-type nickel-iron-manganese-based low-nickel single-crystal positive electrode material as well as preparation method and application thereof

The invention discloses an O3-type nickel-iron-manganese-based low-nickel single-crystal positive electrode material as well as a preparation method and application thereof. The O3 type quaternary single crystal positive electrode material comprises a core material and a carbon coating layer coating the outer surface of the core material, the core material is composed of a quaternary system main material and an auxiliary material doped in the quaternary system main material; the chemical formula of the quaternary system main material is NaNixMyFe1/3Mn1/3O2, wherein M is one of Ca < 2 + >, Zr < 4 + >, Zn < 2 + >, Mg < 2 + > and Ti < 4 + >; 0 < x < = 1/3, and x + y = 1/3; the auxiliary materials are two or more of transition metal ions except M. The performance of the material is improved and enhanced through ion doping and carbon coating, collapse of the material structure in the repeated charging and discharging process can be reduced, the cycle performance of the material is optimized, the gram capacity of t