Elaboration and Optimization of Electrodes of Secondary Generators with Active Material of Mixed Oxides of Cobalt and Nickel of Spinel Structure Prepared by the Method of Thermal Decomposition of Nitrates

Abstract

Mor Cisse, Mamadou Gueye, Modou Gningue Diop and Makhtar Guene

In this study, we prepared particles of mixed oxides of nickel and cobalt of spinel structure of formula NiCo2O4 by the method of thermal decomposition of nitrates. Physical characterizations were made with X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). XRD and IRTF analyzes confirmed the nature and crystal structure of the synthesized oxide particles. The study of the optimization of the electrodes in pellets, composed of nickel cobaltite as active material, graphite and Teflon, by the conductivity and the porosity made it possible to show that the electrode of 30% of active material, 5% of teflon and 65% of graphite as the electrode optimized for its use in secondary generators. The electrochemical characterization shows that the optimized electrode has an equilibrium potential of 288.6 V and a capacity of 318 C with an efficiency of 98.9% at a current of 10 mA.

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