Sol Gel Synthesis of Nanoparticles Ni0.5Mg0.5Fe1.7Mn0.3O4as Anode Material for Lithium-ion Batteries

Spinel transition-metal oxides have showed excellent electrochemical performances as anode material for lithium ion-batteries due to their high theoretical capacities and good reversibility. Their capacity is typically 2–3 times higher than that of the graphite/carbon-based electrode materials. Moreover, their low cost and environmental benignity render them promising anodes for the next-generation lithium-ion batteries (LIBs). In this work, we report the synthesis of Ni0.5Mg0.5Fe1.7Mn0.3O4 anode material by a sol-gel method. The synthesized product was characterized by X-Rays diffraction (XRD) and Raman spectroscopy techniques. The XRD result showed that at 800 °C temperature, the material exhibits a cubic symmetry with the space group (Fd-3m). The Raman's spectroscopy results showed that there are six Raman active modes (A1g (1), A1g (2), T2g (1), T2g (2), Eg and T2g (3)), which are all observed at 800 °C temperature. The electrochemical properties of this anode material are investigated by galvanostatic and cyclic voltammetry tests. The material delivers an initial discharge/charge specific capacity of 1275 and 874 mAh g⁻¹ under the current density of 100 mA g^-1. After 10 cycles, the discharge and charge capacities of the Ni0.5Mg0.5Fe1.7Mn0.3O4 was 728 and 725 mAh g^-1 and the capacity retention was around 83%. A carbon coating of Ni0.5Mg0.5Fe1.7Mn0.3O4 material leads to a higher cycling stability and a perfect capacity retention about 100%.