  We prepared Na$_x$TO$_2$ (T = Mn, Co) nanostructures to use as cathode
material in Na-ion batteries. The Rietveld refinement of x-ray diffraction data
confirms the hexagonal symmetry. Scanning and transmission electron microscopy
measurements show hexagonal and rod-shape morphology for T = Co and Mn,
respectively. The magnetic measurements indicate the presence of variable
oxidation states of Mn/Co ions, but no long range ordering till 5~K. We find
that the Na$_{0.6}$MnO$_2$ is highly insulating whereas Na$_{0.7}$CoO$_2$ is
semiconducting in nature. The conduction in Na$_{0.7}$CoO$_2$ takes place
through both variable range hopping (VRH) as well as activation mechanisms in
different temperature ranges. However, for Na$_{0.6}$MnO$_2$ the VRH prevails
at elevated temperatures. Furthermore, the coin cells have been fabricated and
tested the electrochemical behavior using cyclic voltammetry, which confirms
the reversibility of Na--ions during intercalation/de-intercalation.
