Lithium interaction with catalytic carbon nanotubes under high-pressur
e conditions was studied. A large amount of Li (2Li/C) reacted with th
e carbon nanotubes forming an intercalation compound (I-c similar to 4
.1 Angstrom) which follows from X-ray diffraction and IR spectroscopy
data. We cannot exclude also the possibility of insertion of a part of
Li into the channel of the nanotubes.