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Recently, hydrogen storage and transportation are being studied all over the world as the key technology to establish clean and renewable energy systems for a sustainable society. In the case of an on−board application for a vehicle, hydrogen should be stored in a compact, light, safe, and reasonable vessel. Hydrogen storage materials can safely store higher density of hydrogen compared to the gaseous and liquid hydrogen storage systems. Therefore, the systems using hydrogen storage materials are considered as the most suitable technique (Akiba, 1999, Grochala & Edwards, 2004, Sandrock, 1999, Schlapbach & Zuttel, 2001, Zuttel, 2007). Particularly, much attention has been paid to materials based on the light elements because these materials are expected to realize high gravimetric and volumetric densities of hydrogen (Orimo & Nakamori et al., 2007, Schuth & Bogdanovic et al., 2004, Zuttel, 2004). Carbon is one of the attractive light elements because of abundant resource and low cost. Therefore, a lot of carbon based materials have been investigated as a hydrogen storage material since Dillon et al. reported on single−walled carbon nano−tubes in 1997 (Dillon & Jones et al., 1997). Among the carbon based materials, the hydrogenated nano−structural graphite (CnanoHx) can stably store large amount of hydrogen. The hydrogen ab/desorption properties of CnanoHx have been investigated so far (Chen et al., 2003, Ichikawa et al., 2004, Majer et al., 2003, Miyaoka et al., 2010, Orimo et al., 1999, Orimo et al., 2001, Stanik et al., 2005). CnanoHx is synthesized from graphite by ball−milling method under hydrogen atmosphere. With respect to the hydrogen absorption site in this product, the hydrogen atoms are chemisorbed as the stable C−H bonds at the graphene edges and defects induced by ball−milling (Fukunaga & Itoh et al., 2004, Itoh & Miyahara et al., 2003, Ogita & Yamamoto et al., 2004, Smith & Miyaoka et al., 2009). On the other hand, this product needs a high temperature of more than 700 °C to release the hydrogen, and desorbs a considerable amount of hydrocarbons, such as methane (CH4) and ethane (C2H6), together with hydrogen. Furthermore, it is quite difficult to recharge this product with hydrogen under moderate conditions of pressure and temperature for the on−board application. In order to improve the hydrogen absorption and desorption properties of CnanoHx, Ichikawa et al. have paid attention to the chemical reaction between NH3 and LiH, which is one of the elementary reactions in the Li−N−H system (Ichikawa & Hanada et al., 2004). This reaction proceeds even at room temperature and the hydrogen is released, indicating that the stable ionic crystal of LiH is

Hydrogen Storage Properties of Hydrogenated Graphite and Lithium Hydride Nanocomposite