It was revealed that LiBH4 is destabilized by mixing with LiNH2 and the mixture desorbs a large amount of hydrogen. First-principles calculations predicted that the enthalpies of dehydrogenation for LiBH4 alone and the mixture of LiBH 4∈+∈2∈LiNH2 are 75 kJ/molH2 and 23 kJ/molH2, respectively. Motivated by this prediction, we experimentally examined the dehydrogenation properties for LiBH4 and the mixture under hydrogen pressure. The amounts of desorbed hydrogen from LiBH4 and the mixture at 703 K and 522 K were 10.6 mass∈% and 7.8 mass∈%, respectively. The dehydrogenation pressure of the mixture was much higher than that of LiBH4 alone, although the mixture was measured at approximately 180 K lower temperature. This result suggests that the mixture is much unstable as compared with LiBH4 alone.
|Number of pages||4|
|Journal||Applied Physics A: Materials Science and Processing|
|Publication status||Published - 2005 Apr|