Thermal analysis of the binary system KCl-LiCl in the composition range 0.368–0.812 mol fraction of LiCl was studied by differential
scanning calorimetry (DSC). On the basis of the DSC curves, the experimental data for the phase-diagram, the latent heat of
fusion, and the average specific heat in the liquid and solid states are presented as a function of the composition of the
mixture. The experimental results compared with literature data. The following empirical correlation between the heat of fusion
(ΔH) and of compositions of the mixture in mol fraction of LiCl (x) was obtained: ·GH=26.95−50.20x+43.06x2 with a minimum value of 11.8 kJ(g mol)−1 at the eutectic point of 0.587 mol fraction of LiCl at 354.4°C. These results are required as basic data to develop thermal
energy storage materials, based on the phase change of a molten mixture of KCl-LiCI.