DecarbonizationReductive leaching ofRecovery the transportation sector has led to an increase in the adoption of lithiumLithium-ionLithium-ion battery batteriesBattery or LIBs. Efficient recyclingRecycling of Li-ion batteriesBattery is essential to conserve resources and address challenges related to sustainable extraction and supply of critical batteryBattery materials like Li, Ni, Mn, and Co. Hydrometallurgical processes often employ expensive reductants to dissolve transition metals with higher oxidation states in the cathode active mass. To address this issue, the current study proposes an alternative and cost-effective approach by utilizing copperCopper extracted from the spent batteriesBattery as a reducing agent, replacing costly options like H2O2, glucose, and citric acid. The dissolved copperCopper is subsequently recovered through electrowinningElectrowinning. The study investigates the effect of H2SO4 concentration, and Cu amount on the dissolution of cathode active material. During leachingLeaching, a dissolution rate of more than 98% can be achieved for the batteryBattery material, and the consumed copperCopper can be completely recovered through electrowinningElectrowinning in metallic form.