With the rapid proliferation of new energy vehicles, there is a considerable surge in demand for lithium salts, consequently imposing constraints on the advancement of lithium-ion batteries. Addressing this issue, the efficient recuperation of lithium from spent lithium-ion batteries emerges as a pivotal solution. Notably, prevailing recovery techniques predominantly prioritize nickel and cobalt retrieval, often culminating in substantial lithium losses and diminished recovery rates during protracted wet and pyrometallurgical processes. Against this backdrop, this study advocates the utilization of the pyrite sulfation roasting water immersion method for the proficient and selective extraction of lithium from waste lithium-ion battery ternary cathode materials. This approach curtails the lithium recovery timeline, achieved a lithium recovery rate of 98.68%, and accomplishes a value-added and productive utilization of lithium by synthesizing the lithium carbonate. The outcomes offer valuable insights into the domain of lithium recovery from discarded lithium-ion batteries, carrying significance for future research endeavors in this sphere.