Thermal energy storage (TES) is an emerging technology market which recently has been identified as a key enabling storage method for more efficient energy use in heating and cooling applications. Key challenge is that the materials currently used are not efficient enough and of too high cost. TES can be used in various areas, including with renewable energies. State of the art of TES for concentrating solar power (CSP) is molten salt storage, but energy storage density if low. Other requirements to consider for heat storage are cost, charging rate, reversibility and long cycle life of 30 years. The materials with highest energy density are based on thermochemical reactions and include metal hydrides and metal oxides. We are developing a dual bed metal hydride heat storage based on reversible hydrogen absorption/desorption reactions. The technical concept is based on a system that consists of a high-temperature (HT) metal hydride bed for heat storage operating at ≥675°C and 4.5 bar pressure connected to a second metal hydride bed operating at low temperature (LT) which is used to store H<sub>2</sub> near ambient temperature until heat needs to be generated for electricity production at the HT-bed.  We will here present our materials development to optimize the performance of the metal hydrides for heat storage applications.<br/>

Development of metal hydrides for high temperature thermochemical energy storage

249th National Meeting (2015)

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