Li+ ion diffusion in LiMn2O4 thin film prepared by PVP sol-gel method

LiMn2O4 thin film (I mu m thick) was prepared on a gold substrate by the PVP sol-gel method. The electrochemical properties of the thin-film electrode were studied in an electrolyte I mol dm(-3) LiClO4/(ethylenecarbonate + diethyl carbonate). The prepared LiMn2O4 showed a good charge-discharge performance, and the capacity fade was ca. 20% during 200 cycles. The Li+ ion diffusion in the LiMn2O4 thin film was investigated by means of potentiostatic intermittent titration technique and electrochemical impedance spectroscopy. The chemical diffusion coefficients were estimated to be 10(-8) to 10(-10) cm(2) S-1. (c) 2005 Elsevier B.V. All rights reserved.