We have studied the Li-diffusion coefficient values of electrospun Nb2O5 nanofibers and nanonuggets for lithium batteries. In brief, Nb2O5 nanofibers were prepared by electrospinning followed by sintering at temperatures range 500-1100 degrees C for 1 h in air to obtain pseudo-hexagonal, orthorhombic (O), and monoclinic (M) Nb2O5 phases. Electrochemical properties were evaluated by galvanostatic technique at room temperature. The H-, O- and M-Nb2O5 polymorphs delivered discharge capacities (at second cycle) of 152, 189 and 242 (+/-5) mA h g(-1), respectively. The lithium diffusion coefficients (D-Li) are calculated using galvanostatic intermittent titration technique (GM) and electrochemical impedance spectroscopy (EIS) techniques carried at room temperature. The evaluated Du values by GITT for H-, O-, and M-Nb2O5 phases are in the range 10(-17)-10(-15), 10(-15)-10(-14), and 10(-13)-10(-12) cm(2) s(-1), respectively, in the voltage range 1.0-2.6V vs. Li. D-Li evaluated by EIS gave similar trend in the values but with a difference of one order higher magnitude. (C) 2013 Elsevier Ltd. All rights reserved.