  The results of polarization-dependent Raman spectroscopy of
single-crystalline LiVO$_2$ exhibiting transition to a diamagnetic state below
$T_c \sim $500K are reported. Our measurements clearly detect additional peaks
in the low-temperature phase, which disappear nearly completely when heated
above $T_c$. Proposed $\sqrt{3}$a \times $\sqrt{3}$a lattice reconstruction
explains these new Raman peaks by the Brillouin zone folding. The experiment,
on the one hand, confirms that the symmetry of the non-magnetic phase is not
lower than trigonal, but, on another hand, our thermal cycling study suggests
possible stacking faults. This agrees with results of the density functional
theory calculations, which show that the energy difference between different
types of stacking does not exceed 1 K per formula unit.
