Method for repairing cracks of positive electrode material precursor

The invention relates to a method for repairing cracks of a positive electrode material precursor, which comprises the following steps of: (1) in the process of preparing the positive electrode material precursor through coprecipitation reaction, when the particle size of the positive electrode material precursor reaches a target particle size, standing a reaction system, and then removing supernatant liquid after standing and layering to obtain slurry to be repaired; (2) mixing an alkaline solution with the to-be-repaired slurry in the step (1), and then continuously mixing a thickening agent; and (3) heating for crack repair. According to the repairing method provided by the invention, cracks on the surfaces of the large-particle-size precursor and the high-nickel precursor can be repaired, and the product percent of pass is effectively improved; moreover, the repair method provided by the invention is simple to operate and convenient for industrial conversion, and has a good commercial prospect. 本发明涉及一种正极材