NIR spectra obtained with Spitzer telescope are shown here for some Li-rich and super Li-rich giant stars: (a) PDS 365, A(Li) = 3.3 dex; (b) PDS 100, A(Li) = 2.4; (c) PDS 68, A(Li) = 4.0; and (d) HD 30834, A(Li) = 2.6 and HD 146850, A(Li) = 1.6. The first three stars present a strong emission continuum due to their attached shells, and following our model they are in the sudden Li-enriching stage. In the last two stars, the Li-enrichment process is finished and the shell, which is no longer present, is considered to be ejected, whereas the star keeps its Li for a certain time. Superposed on these emission continuums are localised emission peak features due to the presence of complex aromatic organic and inorganic structures (see DLR15).