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

The supercapacitive behavior of the metallic cobalt recycled from Li-ion batteries has been studied in this work. The reversibility of both redox process (Co II /Co III ) and (Co III /Co IV ) in KOH 6 mol L −1 is very high and promising for capacitive applications in electrochemical devices. The spe...

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Bibliographic Details
Published in:Journal of applied electrochemistry 2012-06, Vol.42 (6), p.361-366
Main Authors: Garcia, Eric M., Tarôco, Hosane A., Matencio, Tulio, Domingues, Rosana Z., dos Santos, Jacqueline A. F., Ferreira, Roberta V., Lorençon, Eudes, Lima, Diana Q., de Freitas, Marcos B. J. G.
Format: Article
Language:English
Subjects:
Batteries
Capacitance
Capacitors
Chemistry
Chemistry and Materials Science
Cobalt
Devices
Electrochemistry
Industrial Chemistry/Chemical Engineering
Lithium-ion batteries
Mathematical analysis
Physical Chemistry
Recycling
Short Communication
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Summary:The supercapacitive behavior of the metallic cobalt recycled from Li-ion batteries has been studied in this work. The reversibility of both redox process (Co II /Co III ) and (Co III /Co IV ) 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/cm 2 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.
ISSN:0021-891X
1572-8838
DOI:10.1007/s10800-012-0419-z