Thin films (1μm-thick) of LiMn2O4 were prepared on a Au substrate by using the PVP sol–gel method. The electrochemical properties of the thin-film electrode were studied in an electrolyte 1mol/dm3 LiClO4/(ethylene carbonate + diethyl carbonate). The prepared LiMn2O4 showed a good charge–discharge performance, and the capacity fade was about 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 10−10cm2/s.

Li+ Ion Diffusion in LiMn2O4 Thin Film Prepared by PVP Sol–Gel Method. Y.H.Rho, K.Dokko, K.Kanamura: Journal of Power Sources, 2006, 157[1], 471-6