Preparation and characterization of nanocrystalline SnO₂ thin film by electrodeposition technique

Abstract

A novel process for preparing tin oxide thin films directly on copper foil by electrodeposition was developed. An optimal preparation technology to obtain SnO₂ thin films was proposed with current density of 8 mA/cm², the time of deposition of 120 min, the concentration of tin dichloride of 0.02 mol/L and the concentration of dissociated acid of 0.03 mol/L. The phase identification, microstructure and morphology of the thin films were investigated by thermogravimetric analysis and differential thermal analysis, X-ray diffraction, Fourier transform infrared spectra, scanning electron microscopy and transmission electron microscopy. The as-deposited thin film was composed of SnO₂ · xH₂O was obtained by drying at room temperature. Nanocrystalline SnO₂ thin film having tetragonal structure with average grain size in the range of 8 to 20 nm and porous, uniform surface was obtained by heat-treating the as-deposited film at 400 °C for 2 h. Electrochemical characterization shows that SnO₂ film can deliver a discharge capacity of 798 mAh/g and the SnO₂ film with smooth surface and annealed at 400 °C for 2h has better cycle performance than that with rough surface and annealed at 150 °C for 10 h.

Keywords

tin oxide / film / electrodeposition / lithium ion battery / electrochemical properties

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