The development of thermal energy storage is essential to enable the full potential of renewables sources. Sorption thermal energy storage (STES) seems to be the most interesting way to stock thermal energy, due to the highest values of stored energy density and because of its intrinsically inability to generate losses. The ideal materials for STES must have low-cost and a high thermal performance, some examples of this typology of materials being hydrated salts and zeolite. However, either they have a prohibitive cost like in the case of zeolite (≈2.50 €/kg) or they suffer from problems of deliquescence or agglomeration, like in the case of hydrated salts.