Electrochemical recycling of cobalt from spent cathodes of lithium-ion batteries: its application as supercapacitor |
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Authors: | Eric M. Garcia Hosane A. Tarôco Tulio Matencio Rosana Z. Domingues Jacqueline A. F. dos Santos Roberta V. Ferreira Eudes Lorençon Diana Q. Lima Marcos B. J. G. de Freitas |
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Affiliation: | 1.Department of Chemistry,Federal University of Minas Gerais,Belo Horizonte,Brazil;2.Department of Chemistry,Federal University of Espírito Santo,Vitoria,Brazil;3.Federal University of S?o Jo?o Del-Rei /Sete Lagoas,Sete Lagoas,Brazil |
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Abstract: | The supercapacitive behavior of the metallic cobalt recycled from Li-ion batteries has been studied in this work. The reversibility of both redox process (CoII/CoIII) and (CoIII/CoIV) in KOH 6 mol L−1 is very high and promising for capacitive applications in electrochemical devices. The specific capacitances calculated from cyclic voltammetry and electrochemical impedance spectroscopy show a good agreement, giving the value of 625 Fg−1. The electrode morphology presents a high porosity, thus an electrical equivalent circuit composed of two parallel resistance and capacitance elements in series was proposed. The specific capacitance values calculated from charge/discharge curves at 0.23 and 2.3 mA/cm2 are 601 and 384 Fg−1, respectively. Thereby, it was observed that metallic cobalt recycled from ion-Li batteries is compatible with other supercapacitive materials. This shows that cobalt recycling from Li-ion batteries is economically and environmentally viable for application in supercapacitor devices. |
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