Method for preparing doped and modified nickel-cobalt lithium aluminate anode materials

The invention provides a method for preparing doped and modified nickel-cobalt lithium aluminate anode materials. The method includes (1), preparing first mixed liquor with nickel salt and cobalt salt; (2), preparing second mixed liquor with aluminum salt, complexing agents and compounds with doped metal elements; (3), combining flow of the first mixed liquor, flow of the second mixed liquor, flow of alkali liquor and flow of ammonia water solution with one another to obtain mixed flow, adding the mixed flow into a reaction kettle, carrying out reaction at the temperatures of 50-80 DEG C for 36-64 h, filtering, washing and drying obtained materials after the reaction is completely carried out so as to obtain doped and modified nickel-cobalt-aluminum precursors; (4), uniformly mixing the doped and modified nickel-cobalt-aluminum precursors and lithium source compounds with one another to obtain mixtures, heating the mixtures in oxygen atmosphere at the speed of 4-10 DEG C/min until the temperatures of the mixtures reach 700-800 DEG C, calcining the mixtures under heat-insulation conditions for 10-20 h, carrying out reaction, then naturally cooling obtained materials until the temperatures of the materials reach the room temperature and smashing and sieving the obtained materials to obtain the doped and modified nickel-cobalt lithium aluminate anode materials. A molar ratio of nickel metal ions to cobalt metal ions to aluminum metal ions in the reaction kettle is 0.80:0.15:0.05. The method has the advantage that the doped metal elements and host elements can be mixed with one another on atomic scales.