Hydrogen has become a promising energy source due to its efficient and renewable properties. Although promising, hydrogen energy has not been in widespread use due to the lack of high-performance materials for hydrogen storage. Previous studies have shown that the addition of Al-based compounds to LiBH 4 can create composites that have good properties for hydrogen storage. In this work, the dehydrogenation performances of different composite systems of 2LiBH 4 + M (M = Al, LiAlH 4 , Li 3 AlH 6) were investigated. The results show that, under a ball to powder ratio of 25:1 and a rotation speed of 300 rpm, the optimum ball milling time is 50 h for synthesizing Li 3 AlH 6 from LiH and LiAlH 4. The three studied systems destabilized LiBH 4 at relatively low temperatures, and the 2LiBH 4-Li 3 AlH 6 composite demonstrated excellent behavior. Based on the differential scanning calorimetry results, pure LiBH 4 released hydrogen at 469 • C. The dehydrogenation temperature of LiBH 4 is 416 • C for 2LiBH 4-Li 3 AlH 6 versus 435 • C for 2LiBH 4-LiAlH 4 and 445 • C for 2LiBH 4-Al. The 2LiBH 4-Li 3 AlH 6 , 2LiBH 4-LiAlH 4 , and 2LiBH 4-Al samples released 9.1, 8, and 5.7 wt.% of H 2 , respectively. Additionally, the 2LiBH 4-Li 3 AlH 6 composite released the 9.1 wt.% H 2 within 150 min. An increase in the kinetics was achieved. From the results, it was concluded that 2LiBH 4-Li 3 AlH 6 exhibits the best dehydrogenation performance. Therefore, the 2LiBH 4-Li 3 AlH 6 composite is considered a promising hydrogen storage material.

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