We describe a straightforward route to reuse nickel cobalt manganese oxide (NCM) cathode from deteriorated spent Li-ion battery. The approach involves electrochemical way to delaminate the NCM cathode film from the current collector through the anodic oxidation of aluminum with an assist of oxygen evolution. The influence of applied voltage type and delamination area on the delamination behavior of spent cathode is investigated in detail. Moreover, the reusability of electrolyte that is used for electrochemical delamination of NCM is examined, suggesting further scaling-up of the process. After the successful delamination of the NCM black film, appropriate hydrothermal and subsequent sintering treatments are applied for regenerating NCM cathode capacity. The recycled NCM exhibits a reversible capacity of 143.6 mAh cm-2 at 0.2 C after 100 cycles, with a capacity retention of 84.7%. This performance surpasses that of both the spent NCM and the pristine NCM, primarily being attributed to the successful regeneration of lithium loss and restoration of the layered structure, which are carefully characterized by various measurements, including XRD (with Rietveld refinements), SEM, TEM, XPS, and electrochemical characterizations.