Room-temperature synthesis of crystallized LiCoO sub(2) thin films by electrochemical technique

LiCoO sub(2) thin films have been directly synthesized on cobalt substrate in LiOH solution at room temperature by electrochemical method. The obtained LiCoO sub(2) thin films were characterized by X-ray diffraction (XRD), scanning electronic microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The influence of electrochemical reaction time, current density and concentration of LiOH solution on the crystal structure and morphology of the obtained LiCoO sub(2) thin films was discussed emphatically. Our results show that the as-synthesized LiCoO sub(2) films all are pure hexagonal structure. The crystallinity, densification and uniformity of the films increase with increasing electrochemical reaction time, current density as well as concentration of LiOH solution and then decrease. The preferable electrochemical reaction conditions were optimized as: electrochemical reaction time is 50 h, current density is 1 mA cm super(-2) and concentration of LiOH solution is 3 mol dm super(-3).