The electrochemical properties of a new mixed oxide Fe0.11V2O5.16 as a Li intercalation compound are investigated in relation with structural characteristics. The x variation of the chemical diffusion coefficient for lithium ions is determined from a.c. impedance spectroscopy measurements on a wide composition range 0 is found to be strongly dependent on x in LixFe0.11V2O5.16. These results are completed by XRD investigation performed on reduced electrodes. Ferric ions located in octahedral sites of V2O5 stabs act as stabilizing agents of the host lattice in that emergence of lithiated phases related to epsilon and gamma structure is delayed towards deeper depths of discharge than in the case of LixV2O5.