Abstract
Green and sustainable recycling of lithium-ion batteries is an important problem that requires immediate attention to meet the rapid growth in critical materials demand for the electric vehicle (EV) market. In this work, a holistic study is presented to develop a closed-loop Li and Co metal recovery and separation process for LiCoO2 electrode materials using oxalate chemistry. More than 97% of Co and Li extraction and almost complete separation between these metals were found in the digestion using oxalic acid at a concentration of 0.46 M, a solid-to-liquid ratio of 15 g/L, agitator speed of 600 rpm, and a temperature of 100 °C. An optimum pH of about 2.5 was identified to achieve efficient extraction and separation between Li and Co. A novel oxalic acid regeneration process using ion-exchange resins is proposed to recover oxalate, reduce waste production, and lower the overall cost of the process. The experimental results are supported with a chemical speciation study and a shrinking core model based kinetic study to develop a deeper understanding of the interfacial processes.
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Verma, A., Corbin, D.R., Shiflett, M.B. (2021). A Sustainable Oxalate Process for Recovery of Metals from LiCoO2: Experimental and Modeling Study. In: Anderson, C., et al. Ni-Co 2021: The 5th International Symposium on Nickel and Cobalt. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-65647-8_12
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