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Hydrogen storage, fullerene, LiBH 4 , nanocomposite, fullerane Reversible hydrogen storage in a LiBH 4 :C 60 nanocomposite (70:30 wt. %) synthesized by solvent-assisted mixing has been demonstrated. D uring the solvent-assisted mixing and nanocomposite formation, a chemical reaction occurs in which the C 60 cages are significantly modified by polymerization as well as by hydrogenation (fullerane formation) in the presence of LiBH 4 . We have determined that two distinct hydrogen desorption events are observed upon rehydrogenation of the material, which are attributed to the reversible formation of a fullerane (C 60 H x ) as well as a LiBH 4 species. This system is unique in that the carbon species (C 60 ) actively participates in the hydrogen storage process which differs from the common practice of 2 melt infiltration of high surface area carbon materials with LiBH 4 (nanoconfinment effect). This nanocomposite demonstrated good reversible hydrogen storage properties as well as the ability to absorb hydrogen under mild conditions (pressures as low as 10 bar H 2 or temperatures as low as 150°C). The nanocomposite was characterized by TGA-RGA, DSC, XRD, LDI-TOF-MS, FT-IR, 1 H NMR, and APPI MS.