Combustion synthesis of nanocrystalline MgFe2O4 as anode material for lithium ion batteries applications

D. Narsimulu, E.S. Srinadhu and N. Satyanarayana
Pondicherry University,
India

Keywords: nanocrystalline MgFe2O4 , combustion process, cyclic voltametry, charge - discharge

Summary:

Spinel ferrites such as MgFe2O4, CoFe2O4, ZnFe2O4, NiFe2O4, etc., are considered as promising anode materials for lithium ion battery (LIB), since these exhibit high capacity, environmental friendly, availability of very cheap precursors, etc. MgFe2O4 stands out from other ferrites, due to its high abundance, low toxicity, high theoretical capacity (1072 mAhg-1), etc. Hence, the present work focused on the preparation of nanocrystalline MgFe2O4 by using urea assisted citrate combustion process and characterized using XRD, FE-SEM, BET. Also, lithium battery was fabricated using the developed nanocrystalline MgFe2O 4, as anode material, and investigated its electrochemical performance through cyclic voltametry (CV) and charge - discharge characteristics, to find out its suitability, as a anode material, for lithium battery applications. In the urea assisted citrate combustion process, the ratio of citric acid and urea were maintained in the 1:0.5 ratio and the prepared the nanocrystalline MgFe2O4. The formation of the pure nanocrystalline phase of the MgFe2O4 sample was confirmed from X-ray diffraction (XRD) results and the calculated crystallite size of the prepared MgFe2O4 sample was found to be 29.98 nm. The morphology of the MgFe2O4 sample was confirmed from FE-SEM image shown Fig.1. The specific surface area of the MgFe2O4 sample was calculated using BET method and the measured N2 adsorpion-desorption data. The specific surface area of the MgFe2O4 sample was found to be 29.4038 m2g-1. The lithium ion battery was fabricated using MgFe2O4 as a anode material and studied its electrochemical performance through cyclic voltametry (CV) charge - discharge measurements. Fig.2. shows the CV curves of lithium ion battery , fabricated using MgFe2O4 as a anode material, at scan rate of 0.01 mV/s between the voltage range of 0.0001-3V. Fig.3, shows the discharge/charge capacity and coulombic efficiency as a function of cycle number of the lithium ion battery fabricated using MgFe2O4 as a anode material. The electrochemical results show that the developed nanocrystalline magnesium ferrite could be a better anode material for lithium battery applications. Detailed results will be presented and discussed.