Method for preparing a thermochemical energy storage material

摘要

This invention discloses a method for preparing a thermochemical energy storage material comprising CaO or Ca(OH) 2 . The material also comprises a matrix of hard cementitious material containing silica and calcium silicates that result from the reaction of a binder, such as Na 2 Si 3 O 7 , with the external part of the CaO particles originally embedded in the binder. The cementitious material is characterized by the secondary products of a reaction of the calcium silicates with CO 2 at high temperature followed by a calcination step of all formed carbonates. The resulting material displays superior mechanical and chemical properties after many reversible cycles of hydration with H 2 O (v) and dehydration of Ca(OH) 2 and can be used for thermochemical energy storage systems.