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The LiBH 4 /CaH 2  composite are firstly studied as Concentrating Solar Power Thermal Storage Material. The LiBH 4 /CaH 2  composite according to the stoichiometric ratio are synthesized by high-energy ball milling method. The kinetics, thermodynamics and cycling stability of LiBH 4 /CaH 2  composite are investigated by XRD (X-ray diffraction), DSC (Differential scanning calorimeter) and TEM (Transmission electron microscope). The reaction enthalpy of LiBH 4 /CaH 2  composite is almost 60 kJ/mol H 2  and equilibrium pressure is 0.482 MPa at 450 °C. The thermal storage density of LiBH 4 /CaH 2  composite is 3504.6 kJ/kg. XRD results show that the main phase after dehydrogenation is LiH and CaB 6 . The existence of TiCl 3  and NbF 5  can effectively enhance the cycling perfomance of LiBH 4 /CaH 2  composite, with 6–7 wt% hydrogen capacity after 10 cycles. The high thermal storage density, high working temperature and low equilibrium pressure make LiBH 4 /CaH 2  composite a potential thermal storage material.

Investigation on LiBH4-CaH2 composite and its potential for thermal energy storage