Electrochemical characterization of thin-film LiCoO2 electrodes in propylene carbonate solutions

Thin films of LiCoO2 (0.22–1.15 μm) were prepared by oxidation of metallic cobalt in molten alkali carbonates containing Li+ ions. We report here the behavior of the thin film of LiCoO2 by cyclic voltammetry in propylene carbonate solvent systems, the kinetic analysis using electrochemical impedance spectroscopy (EIS), and potential step chronoamperometry (PSCA). The chemical diffusion coefficients for Li+ ions in the LiCoO2 electrodes were determined; D = (2.3–9.0) × 10−12 cm2/s by PSCA, and D = 0.9 × 10−9 − 2 × 10−8 cm2/s by EIS.