Zr and B doped high-nickel quaternary positive electrode material and preparation method thereof

The invention provides a preparation method of a Zr and B doped high-nickel quaternary positive electrode material. The preparation method comprises the following steps: S1, preparing nickel sulfate, cobalt sulfate, manganese sulfate and zirconium chloride into a solution A; dissolving sodium metaaluminate in a sodium hydroxide solution to obtain a solution B; adding the solution A, the solution B and an ammonia water solution into a reaction container, and carrying out a co-precipitation reaction to prepare a Zr-doped high-nickel quaternary precursor; and S2, mixing the Zr-doped high-nickel quaternary precursor with LiOH.H2O, then sintering the mixture at the temperature of 400-500 DEG C for 4.5-5.5 h, then heating the mixture to 750-800 DEG C, keeping the temperature for 4.5-5.5 h, then naturally cooling the mixture to room temperature, and introducing oxygen in the whole reaction process to obtain the Zr-doped high-nickel quaternary positive electrode material, and S3, dispersing the Zr-doped high-nickel q