The effects of nanoconfinement on the structural phase transition, H2 release and uptake, and the emission of toxic diborane (B2H6) on desorption of LiBH4 have been comprehensively investigated in the presence of highly ordered nanoporous hard carbon (NPC) with hexagonally packed 2 nm diameter columnar pores by Prof. Xiangfeng Liu et al. Calorimetry, X-ray diffraction, and IR spectroscopy measurements confirm that the LiBH4 within the pores is amorphous. The confinement of LiBH4 in such small pores results in the disappearance of the low temperature structural phase transition, the melting transition, and also the significant decrease of the onset desorption temperature from 460°C to 220°C with respect to bulk LiBH4, a lower temperature than observed in larger pore sizes in the literature. Most importantly, our direct line-of-site residual gas analyzer mass spectrometer (RGA-MS) analyses suggest that diborane release is suppressed or eliminated in the decomposition of non-crystalline LiBH4. Tight nano-confinement may therefore mitigate both safety concerns and loss of active material in borohydride-based hydrogen storage systems.