  Alkali intercalated graphite compounds represent a compelling modification of
carbon with significant application potential and various fundamentally
important phases. We report on the intercalation of graphite with alkali atoms
(Li and K) using liquid ammonia solution as mediating agent. Alkali atoms
dissolve well in liquid ammonia which simplifies and speeds up the
intercalation process, and it also avoids the high temperature formation of
alkali carbides. Optical microscopy, Raman, and electron spin resonance
spectroscopy attest that the prepared samples are highly and homogeneously
intercalated to a level approaching Stage-I intercalation compounds. The method
and the synthesis route may serve as a starting point for the various forms of
alkali atom intercalated carbon compounds (including carbon nanotubes and
graphene), which could be exploited in energy storage and further chemical
modifications.
