ELECTROCHEMICAL LITHIUM INTERCALATION INTO AND DEINTERCALATION FROM VANADIUM-OXIDE ELECTRODE BY USING POTENTIOSTATIC CURRENT TRANSIENT TECHNIQUE

The transport of lithium through anodic vanadium oxide film and porous vanadium oxide electrodes was investigated as a function of lithium c harging potential and film thickness by using a potentiostatic current transient technique. The apparent chemical diffusivities of lithium i on were determined from the current transient curves. The variation of the determined diffusivities in the fresh oxide film and porous oxide electrodes with lithium charging potential and film thickness is disc ussed in terms of the diffusion-controlled movement of phase boundary and interfacial residual compressive stress at the oxide film-metal in terface, respectively. The time exponent value of -1.0 in the cathodic current transients obtained from annealed anodic oxide film electrode suggests that the lithium transport through the oxide film proceeds b y the interface-controlled movement of phase boundary.