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Evaluation of pyrochemistry in molten salts for recycling Li-ion batteries

  • Ruiz Onofre, Patricia Nathaly
Publication Date
Oct 01, 2019
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To meet the increasing demands of lithium-ion batteries, there is an urgent need to recycle the batteries components. In particular, electrode materials containing transition metal oxides such as LiCoO2, LiNi1/3Mn1/3Co1/3O2, and LiNi0.8Co0.15Al0.05O2 are of strategic importance. Over the last three years, this field research has rocketed. In the frame of batteries recycling, there are two main methods that are used in industry nowadays: hydrometallurgy and pyrometallurgy. The aim of our research project is to propose an alternative method to recycle organic compounds and metals of electrode materials based on molten salts as reactive medium. Molten carbonates and molten chlorides have been chosen for their great efficiency on wastes treatment. Cobalt is one of the critical raw materials in batteries and it is rare on the Earth-crust and toxic for environment. In this work, we study cobalt dissolution and recovery in molten carbonates and chlorides. Electrochemical techniques (cyclic voltammetry, chronoamperometry) and X-Ray spectroscopy have been used for the investigations. Results show that a low and slow dissolution of cobalt is obtained in molten carbonates and in the form of Co (II). Molten chlorides have been used as a second alternative of solvent. Cobalt dissolution increase and its recovery have been achieved in this solvent when using additives.

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