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Electrochemical recycling of cobalt from spent cathodes of lithium-ion batteries: its application as supercapacitor

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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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Acknowledgments

The authors acknowledge UFMG, CNPq, FAPEMIG and CEMIG for financial support.

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Authors and Affiliations

  1. Department of Chemistry, Federal University of Minas Gerais, Av. Antônio Carlos, 6627, Belo Horizonte, MG, 13565-905, Brazil

    Eric M. Garcia, Tulio Matencio, Rosana Z. Domingues, Jacqueline A. F. dos Santos, Roberta V. Ferreira, Eudes Lorençon & Diana Q. Lima

  2. Department of Chemistry, Federal University of Espírito Santo, Av. Fernando Ferrari, Goiabeiras, 514, Vitoria, ES, 29075-910, Brazil

    Marcos B. J. G. de Freitas

  3. Federal University of São João Del-Rei /Sete Lagoas, Rodovia MG 424 Km 47, Sete Lagoas, MG, 35701-970, Brazil

    Hosane A. Tarôco

Authors
  1. Eric M. Garcia
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  2. Hosane A. Tarôco
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  3. Tulio Matencio
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  4. Rosana Z. Domingues
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  5. Jacqueline A. F. dos Santos
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  6. Roberta V. Ferreira
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  7. Eudes Lorençon
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  8. Diana Q. Lima
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  9. Marcos B. J. G. de Freitas
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Correspondence to Eric M. Garcia.

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Garcia, E.M., Tarôco, H.A., Matencio, T. et al. Electrochemical recycling of cobalt from spent cathodes of lithium-ion batteries: its application as supercapacitor. J Appl Electrochem 42, 361–366 (2012). https://doi.org/10.1007/s10800-012-0419-z

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  • DOI: https://doi.org/10.1007/s10800-012-0419-z

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