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Microfabrication of LicoO2 Thin Film Cell

M. C. Rao

LiCoO2 thin films were prepared by pulsed laser deposition technique on silicon substrates. The electrochemical measurements were carried out on Li//LiCoO2 cells with a lithium metal foil as anode and LiCoO2 film as cathode of 1.5 cm2 active area using a Teflon home-made cell hardware. Cyclic voltammetry (CV) measurements have been carried out at sweep rate α = 1 mVs-1. Two sets of well defined current peaks observed corresponding to the oxidation and reduction reaction located at 3.74 and 3.64 V for the LiCoO2 film. Electrochemical titration was made by charging and discharging the cells in the potential range between 2.0 and 4.2 V. Quasi open circuit voltage profiles were recorded using current pulses of 5 μA cm-2. Electrochemical potential spectroscopy (ECPS) was performed using 5 mV potential steps. Specific capacity 180 mC/cm2μm was measured for the film grown at 300 mTorr.