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Eric, Hurman
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article
Sulfation Roasting Mechanism for Spent Lithium-Ion Battery Metal Oxides Under SO2-O2-Ar Atmosphere
Abstract
<p>Sulfation roasting followed by water leaching has been proposed as an alternative route for recycling valuable metals from spent lithium-ion batteries (LIBs). In the present work, the reaction mechanism of the sulfation roasting of synthetic LiCoO<sub>2</sub> was investigated by both thermodynamic calculations and roasting experiments under flowing 10% SO<sub>2</sub>-1% O<sub>2</sub>-89% Ar gas atmosphere at 700°C. The products and microstructural evolution processes were characterized by x-ray diffraction, scanning electron microscope and energy dispersive x-ray spectrometer, and atomic absorption spectroscopy. It was confirmed that Co<sub>3</sub>O<sub>4</sub> was formed as an intermedia product, and the final roasted products were composed by Li<sub>2</sub>SO<sub>4</sub>, Li<sub>2</sub>Co(SO<sub>4</sub>)<sub>2</sub>, and CoO. The leaching results indicated that 99.5% Li and 17.4% Co could be recovered into water after 120 min of roasting. The present results will provide the basis and solid guidelines for recycling of Li and Co from spent LIBs.</p>