Journal
JOURNAL OF POWER SOURCES
Volume 474, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228596
Keywords
Recovery; Regeneration; Spent lithium-ion batteries; Sulfation roasting; LiCoO2
Funding
- Fundamental Research Funds for the Central Universities [N2025035, XLYC1807042]
- 111 Project [B16009]
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The operating temperature determines the energy consumption and lithium extraction rate of a pyrometallurgical process. This paper aims to employ a molten ammonium sulfate ((NH4)(2)SO4) assisted roasting approach to recovering and regenerating LiCoO2 from spent lithium-ion batteries (LIBs) at 400 degrees C. First, cathode materials from the spent LIBs are converted to CoSO4 and Li2SO4 via a sulfation roasting approach. Both recovery rates of Li and Co reach over 98% at 400 degrees C for 2h and at an (NH4)(2)SO4/(cathode materials) mass ratio of 4:1 in Ar atmosphere. Then, the obtained Co(OH)(2) and Li2CO3 are used to regenerate LiCoO2 that delivers a specific capacity of over 154 mAh g(-1) at 1C with capacity retention of 94% after 100 cycles. Overall, the molten (NH4)(2)SO4 assisted roasting approach reduces the operating temperature to 400 degrees C while maintaining a high extraction rate of over 98% for both Li and Co, promising an energy-efficient approach to recovering various cathode materials from spent LIBs.
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