As already reportded, The Japan Steel Works, Ltd. (JSW) exhibited the small hydrogen storage tank, which uses aluminum hydride (AlH3) as a hydrogen storage material, in FC EXPO 2008.
AlH3 has many attractive features as the hydrogen storage material. However, little attention has been attracted to AlH3 since no one knows the process of synthesizing it.
Institute for Materials Research Tohoku University (*) and The Japan  Steel Works, Ltd. found the synthesis process last year, and succeeded in stable synthesis of AlH3
The resultant aluminum hydride could be stored at normal temperature for a long time of several months.

Description is given in the following order.
1. Hydrogen storage density is very high
2. AlH3 weight is light
3. Hydrogen releasing temperature is low
4. Succeeded in the synthesis process of AlH3

1. Hydrogen storage density is very high
The mass-storage density and the volume-storage density of AlH3 are both high. The former is 10.1 mass%, and the latter is 149 kgH2/cm3.
For those densities, reference is made to
1) "Fig. 1 in "Recent Our Studies", and
2) "Fig. 2 on page 94 in "Diversifying of Hydrogen Storage Technologies for Fuel Cell Vehicles, published by Nikkei BP".

* A) Synthesis technique of aluminum hydride, as a high-density hydrogen storage material, was developed
B) Orimo Laboratory Institute for Materials Research Tohoku University

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