Failure graphite-based regenerated graphite material for waste batteries and preparation method and application of failure graphite-based regenerated graphite material

The invention belongs to the field of waste graphite recovery, and particularly relates to a preparation method of a waste battery failure graphite-based regenerated graphite material, which comprises the following steps: carrying out first-stage gas-solid modification on waste battery failure graphite in advance at an atmosphere A and a temperature T1, and then carrying out second-stage gas-solid modification at an atmosphere B and a temperature T2 to obtain a modified material; the atmosphere A comprises a halogen-containing atmosphere, and the temperature T1 is 1100 DEG C or above; the atmosphere B is an atmosphere containing at least one functional gas of oxygen and carbon dioxide, and the temperature T2 is 400-800 DEG C; carrying out quenching treatment on the modified material to obtain a quenched material; and compounding the quenched material with a carbon source, and then carrying out carbonization treatment to obtain the spent graphite-based regenerated graphite material for the waste batteries. The