Electrodeposition of Fe₃O₄ Thin Film and Its Application as Anode for Lithium Ion Batteries

Fe₃O₄ films were prepared by electrodeposition under varying preparation conditions (current density, temperature, and time). The electrodeposited Fe₃O₄ were characterized in terms of morphology and composition using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The electrodeposited films were also tested as anode in coin cell systems. Fluoroethylene carbonate (FEC) electrolyte was found to improve the battery performance due to formation of a better solid electrolyte interface (SEI). Conducting polymer of polypyrrole (PPY) was coated on the surface of Fe₃O₄ films for the first time with the aim to improve the electric conductivity and to buffer volume expansion of Fe₃O₄ films.