Magnesium hydride MgH2, which is a well-known compound for hydrogen storage, had been investigated as a novel anode material for lithiumï¿½ion batteries reported by Oumellal et al. The theoretical capacity of MgH2 is 2038 mA h gï¿½1 if 2 Li+ incorporate into MgH2, which is almost 6 times to that of graphite. However, the capacity fades rapidly and reduces to less than 200 mA h gï¿½1 after only 5 ~ 10 cycles [1,2], and no improvement had been done for years. In this study, we had successfully retained the reversible capacity of MgH2 electrode by using LiBH4 as a solidï¿½state electrolyte. The result shows a stable reversible capacity of approximately 1230 mA h gï¿½1 can be obtained in the cycling test at a current density of 100 mA gï¿½1 between 0.3 and 1.0 V with nearly 100% capacity retention and 100% coulombic efficiency. The electrode evolution upon dischargeï¿½charge process at different stages had also been investigated in this study. This work opens a new way to look for high capacity anode materials for lithiumï¿½ion batteries. In addition, the electrochemical performance of numerous metal hydrides will be investigated by using LiBH4 based solidï¿½state electrolytes. References:  Y. Oumellal, A. Rougier, G. A. Nazri, J. M. Tarascon, L. Aymard, Nat. Mater. 2008, 7, 916.  S. Brutti, G. Mulas, E. Piciollo, S. Panero, P. Reale, J. Mater. Chem. 2012, 22, 14531.