Hydrogen is a safe renewable energy source that would be ideal to replace fossil fuels because it is highly abundant and its oxidation product is environmentally benign. The clean way to produce hydrogen from water is to use sunlight in combination with photovoltaic cells and water electrolysis. However, the problems of transportation and storage restrict the application of hydrogen energy. The development of materials for efficient hydrogen storage remains a challenge. Several studies have shown that a large surface area and high pore volume are necessary to ensure high hydrogen uptake. The porous material can store the hydrogen gas in the form of molecules at low temperatures and compresses hydrogen into the holes effectively. The incorporation of nanoparticles, such as hydrides or metallic alloys, into a polymer matrix, may be an alternative to obtain materials with promising properties for hydrogen storage. In the present work, the elaboration of metal-polymer nanocomposites for hydrogen storage which consist of a hydride-forming intermetallic compound based on LaNi5 and ABS were developed. The mechanical activation of the initial powder mixtures was employed to provide a good interface between the phases. A series of nanocomposites with different filler concentrations was produced and characterized by x-ray diffraction, scanning electron microscopy, thermogravimetric analysis, differential scanning calorimetry and hydrogen sorption measurements. Morphological analyses showed that usually physically mixture occurred between the components and that in some cases the dispersion of the second phase must be improved, due to the presence of large agglomerates. Hydrogen sorption tests showed an increase in the amount of hydrogen in the presence of metallic phase. Considering previous results it is scientifically interesting to continue research on the interaction of hydrogen with different and well-characterized polymer-based nanocomposites.