Improved extraction of cobalt and lithium by reductive acid from spent lithium-ion batteries via mechanical activation process
Cobalt (Co) and lithium (Li) were extracted from pure LiCoO2 powders and actual cathode material powders from the spent lithium-ion batteries (LIBs) after l-ascorbic acid dissolution via a mechanical activation process. The influences of activation time and rotation speed on the leaching were discussed. The mechanism of the improved leaching yield was proposed based on the characterization analysis including X-ray diffraction, scanning electron microscope, BET-specific surface area and particle size analyzer. The reduced particle size, increased specific surface area of activated samples, destroyed crystal structure and amorphous state of LiCoO2 contributed to the improved leaching efficiencies of Co and Li. With the activated process, about 99% Co and 100% Li were extracted from actual spent LIBs after 60-min grinding at 500 rpm with mild conditions. This effective process would be of great importance for recovering valuable metals from the spent LIBs at room temperature.
We gratefully appreciate the financial support from Shanghai “Chenguang” Program (15CG60), Shanghai Sailing Program (18YF1429900, 15YF1404300), Natural Science Foundation of China (51678353), Shanghai Natural Science Foundation (No. 15ZR1416800), Cultivate discipline fund of Shanghai Polytechnic University (XXKPY1601) and Eastern Scholar Professorship Grant. The authors also acknowledge the Graduate Student Funding Program of Shanghai Polytechnic University (A01GY16F030), Shanghai Polytechnic University Leap Program (EGD18XQD24), and project supported by Shanghai Cooperative Centre for WEEE Recycling (ZF1224).
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Conflict of interest
The authors declare that they have no conflict of interest.
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