Study on the Synthesis of LiCoO₂ from Spent Li-Ion Batteries

Abstract:

A new LiCoO₂ recovery technology from leaching solution of spent Li-ion batteries was studied in this paper. Leaching solution contained many metals, such as Cu, Co and Fe. Copper was removed through replacement by iron powder followed by iron precipitation in goethite method. The experimental results show that Cu can be removed 99% at least through replacement by Fe powder, and the removal of Fe can achieve 99% by goethite method. The optimum Cu removal conditions are that temperature is 50 °C, Fe_mol/Cu_mol=1.5,reaction time is 30 min. The optimum Fe removal conditions are that terminal precipitation pH is 4, temperature is 90 °C, reaction time is 6 h. The remainder Co can be mixed with Li₂CO₃,LiOH•H₂O and LiAc•2H₂O to adjust the Li/Co molar ratio to 1.00. The new LiCoO₂ was obtained by calcining the mixture at 850°C for 12 h in the air. Structure and morphology of the recycled powders and resulted sample were observed by XRD and SEM technique, respectively. The layered structure of the LiCoO₂ synthesized by adding Li₂CO₃ is best, and it is found to have the best characteristics as cathode material in terms of charge–discharge capacity and cycling performance.

• Periodical: Advanced Materials Research (Volume 630)
• Pages: 93-98
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.630.93
• Online since: December 2012
• Authors: Yan Gao, Jin Hui Li
• Keywords: Cycling Performance, Discharge Performance, LiCoO₂, Synthesis

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