Cobalt sulfate was recovered from crushed and screened prismatic type spent lithium ion batteries (LIBs) containing 5~20 % Co, 5~7 % Li, 5~10 % Ni, 15% organic chemicals, and 7% plastics together with Cu, Al, Fe, and Mn. Cobalt was reductively leached from the -16 mesh fraction in 1 h by stirring with 2 M H 2 SO 4 and 6 vol% H 2 O 2 , at 60 o C and 300 rpm using a solid/liquid ratio of 100 g/L togive a cobalt concentration of 28 g/L, corresponding to a leaching efficiency of >99 %. Metal ion impurities such as copper, iron, and aluminium were precipitated as hydroxides from solution by adjusting pH to 6.5. Cobalt was then selectively extracted from the purified aqueous phase by
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