Journal
WASTE MANAGEMENT
Volume 89, Issue -, Pages 83-93Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2019.03.068
Keywords
Spent LiFePO4 batteries; Pyrolysis; Flotation; Color sorting separation; Cathode active materials
Categories
Funding
- National Natural Science Foundation of China [51804342, 51874356, 51604302]
- Natural Science Foundation of Hunan Province [2019JJ50805]
- Innovation Driven Plan of Central South University [2015CX005]
- Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources [2018TP1002]
- Scientific Research Starting Foundation of Central South University [218041]
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In this study, a novel process consisting of pyrolysis and physical separation was proposed to comprehensively recycle spent lithium ion batteries (LIBs). The discharge and pyrolysis behaviors of spent LIBs, the recovery of electrolyte from the spent LIBs by low-temperature volatilization, and the recovery of valuable materials from the pyrolytic residues through physical separation were studied in detail. The results indicated that approximately 99.91% of the organic electrolytes was recycled, and the lithium salt (LiPF6) in the batteries was disposed by pyrolysis process. The active materials could be effectively separated from current collectors after the pyrolysis under N-2 at 550 degrees C for 2 h. The pyrolytic gas was mainly composed of light alkenes, and the pyrolytic tar was mainly composed of aromatic long chain alkenes and light alcohols. Pyrolytic residues were recycled by color sorting, high-pressure water cleaning and flotation processes, and about 99.34% of Al, 96.25% of Cu, and 49.67% of cathode active materials were recovered from the spent LIBs. Finally, electrochemical tests indicate that the cathode active materials obtained by the process can be used to produce new batteries. (C) 2019 Elsevier Ltd. All rights reserved.
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