The property of sorption materials to bind or take in substances is maintained over almost any amount of time provide, of course, that the substances do not get in contact with the sorption material. Technically this can easily be realized. For instance, if the substance that is bound by the sorption material is water it would mean that the sorption material itself has to stay dry.
Since material flows to and from the sorption material can usually be avoided there are almost no energy losses during storage. If the ability of the sorption material to bind other substances is maintained, the options of dehumidification, drying, cleaning, heating and cooling are also maintained. By doing this the sorption materials store heat and cold indirectly. Energy densities that are higher than those of hot water storage systems with a temperature increase of 50 °C are achievable due to the high binding enthalpies of sorption materials.
Apart from the excellent characteristics of power density and storage efficiency a major advantage is the simple decoupling of power and capacity. This is especially true for storage systems with liquid sorption materials.