gamma-Butyrolactone-ethylene carbonate (BL-EC) mixtures have been investigated as electrolytes for Li-ion batteries using LiPF6 and LiBF4 as lithium salt. The thermal stability of the electrolytes in a large range of temperatures (-90 degreesC to 40 degreesC) have been studied by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). From the results of these experiments, the phase diagram of the BL-EC system has been determined. It is characterised by a eutectic point at -56.3 degreesC and a molar fraction in EC: x(EC) = 0.1. A metastable compound has been demonstrated below -90 degreesC at x(EC) = 0.4. Conductivity measurements of BL-EC solutions, in the presence of LiPF6 and LiBF4, indicate that LiPF6 in the eutectic mixture is the most conducting electrolyte in the range of temperatures investigated (-30 degreesC to room temperature). Nevertheless, at low temperature, LiBF4 based electrolytes compete well with LiPF6, especially when the amount of EC in the mixture is as high as xEC = 0.5. Moreover, recrystallisation of the salt below -20 degreesC is avoided when LiBF4 is used as salt. A large increase in viscosity of the solvent mixture is observed when a salt is added, but the increase is lower for LiBF4 than LiPF6. When EC is added to BL at constant salt concentration (1 M), the conductivity of LiPF6 solutions decreases more rapidly than LiBF4 solutions. This has been attributed, at least partially, to the dissociating power of EC. The electrochemical windows of BL-EC (equimolar) mixtures in the presence of LiPF6 and LiBF4 are comparable but it is shown that the solvents oxidation rate at high potentials is lower when LiBF4 is used.