An uniform, dense film of spinel LiMn2O4 (thickness, about 0.5 μm) was prepared by the electrostatic spray deposition method onto a Pt film electrode on Si substrate kept at 400 °C. Electrochemical properties of the LiMn2O4 film in a solution of 1 M LiClO4/propylene carbonate were studied by cyclic voltammetry and potential-step chronoamperometry. The oxidation and reduction of the film, which are accompanied by the extraction/insertion of lithium ions, proceeded almost quantitatively around 4 V vs. Li/Li+ with excellent coulombic reversibility. The apparent chemical diffusion coefficient of Li+ in Li1-xMn2O4 spinel phase varied on the order between 10-10 and 10-12 cm2 s-1 as a function of electrode potentials with minima at the potentials corresponding to the voltammetric current peaks.
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