With the rising demand for lithium-ion batteriesLithium-ion batteries, efficient recyclingRecycling methods are crucial to reduce environmental impactEnvironmental impact and minimize primary resource consumption. This study explores the recovery of valuable metalsMetal from materials obtained after battery direct recyclingDirect recycling. Direct battery recycling focuses on selectiveSelective impurity removal (e.g., copperCopper, aluminumAluminum, and graphite) to produce a partially refined cathode material that requires minimal further processing. In contrastBlack mass, black mass—generated from crude crushing ofBatteries batteries—contains higher impurity levels and undergoes a series of hydro- and pyro-metallurgical processes to isolate key battery metalsMetal. To maximize the recovery of lithiumLithium, nickelNickel, cobaltCobalt, and manganese, this research optimizes leachingLeaching and solvent extraction methods. The recovered materials are then purified to industrial standards, enabling their incorporation into the synthesis of new cathode materials. This study aims to advance a circular economyCircular economy for critical materials by improving the efficiency and sustainabilitySustainability of battery recyclingRecycling.