Synthesis of LiNiO 2 thin film in LiOH solution by hydrothermal method

Abstract

LiNiO 2 films were directly synthesized on nickel substrates in LiOH solution by single hydrothermal method at various hydrothermal reaction temperatures (100–200 °C); the as-synthesized films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), respectively. Our results reveal that the reaction temperature plays an important role in the formation of LiNiO 2 film by hydrothermal method. When the reaction temperature is lower (under 140 °C), the pure LiNiO 2 film cannot be obtained since the insufficient oxidative dissolution of Ni substrate; the crystallinity of LiNiO 2 films increases with the increasing reaction temperature; and when the temperature reaches 200 °C, the pure, dense and uniform LiNiO 2 film has been synthesized.