Dielectric, magnetic and electrochemical characterization of CoFe2O4 nanoparticles and their application as an anode material in Li-ion battery

CoFe2O4 nanoparticles with an average crystallite size of 35 nm were successfully synthesized by hydrothermal method. To illustrate the various physical and chemical properties of the nanoparticles various studies like TGADTA, XRD, SEM, TEM, FT-IR, Raman, Dielectric, Magnetic and Electrochemical properties were carried out. The sample annealed at 800 degrees C was employed to prepare the electrode for Li-ion battery. During cyclic processes of charging and discharging, the capacity of fading was observed after 1st cycle. On annealing the porosity of nanoparticles got reduced and the grain-to-grain contact area was increased. The good discharge capacity in the first reverse cycle revealed less porosity on the electrode, which facilitated the Li-ions to interact with the electrode to form Li2O. The electrochemical impedance analysis for fresh cell (before cycling) as well as after 50th cycles were performed. The flow of charge and diffusion of lithium ions to the working electrode were affected during cycling process and this was due to the formation of solid electrolyte interphase (SEI) on electrode.

Automated summary

CoFe2O4 nanoparticles with an average crystallite size of 35 nm were successfully synthesized, and their physical and chemical properties were characterized. The annealed sample at 800 degrees C showed reduced porosity and increased grain-to-grain contact area, leading to good discharge capacity in the first reverse cycle. The formation of solid electrolyte interphase (SEI) affected the charge flow and lithium ion diffusion during the cycling process.