Electrochemical preparation and Li-insertion of nanocrystalline NiCuO2 thin film

摘要

Nanocrystalline NiCuO2 thin film on stainless steel substrate has been prepared by an novel electrochemical route, that is cathodically electrodepositing NiCu alloy film followed by anodically oxidizing at room temperature. XRD Measurement shows that the film is polycrystalline with tetragonal structure of NiCuO2. It is observed from SEM that the oxide film is uniform without cracks and pinholes, and the estimated grain average size of as-prepared film is less than 50 nm. The electrochemical lithiation and de-lithiation of NiCuO2 thin film electrode delivers a reversible capacity of 540 mAh/g at 10 muA/cm(2) in the voltage range from 0.01 to 3.0 V The capacity retention is respectively about 82% and 78% at the 100 th cycle for the current density of 10 and 80 muA/cm(2).