Priority recovery of lithium and effective leaching of nickel and cobalt from spent lithium-ion battery
(School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, China)
Abstract: The cathode materials of spent lithium-ion batteries (LIBs) were recovered via reductive roasting, Na2CO3 leaching, and ammonia leaching. The effects of roasting parameters, Na2CO3 leaching parameters, and ammonia leaching parameters on the leaching efficiencies of metals were explored. The results show that the mineral phase of spent LIBs is reconstructed during reductive roasting, and more than 99% of Li can be preferentially leached via Na2CO3 leaching. Ni (99.7%) and Co (99.9%) can be leached via one-step ammonia leaching, and Mn cannot be leached. Thus, good leaching selectivity is achieved. The kinetic study shows that the leaching of Ni and Co conforms to chemical reaction control.
Key words: lithium; priority recovery; reductive roasting; ammonia leaching; spent lithium-ion battery