NMR and impedance spectroscopies have been used to study the Li+ ion mobility in the TeO2-LiO0.5-LiX (X = F, Cl) glasses. Activation energies determined from the temperature dependence of de conductivity data decrease as the lithium or halogen content increases. Activation energies deduced from the analysis of the ac conductivity data in the complex modulus formalism and corresponding to the true one-particle energy barrier of ionic motion according to the coupling model, have been compared to those deduced from NMR data (T-1(-1) relaxation time) : a good agreement is obtained. Finally, the influence of the glass composition and ion distribution on Li+ ion mobility has been discussed.