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We prepared Na$_x$TO$_2$ (T = Mn, Co) nanostructures to use as cathodematerial in Na-ion batteries. The Rietveld refinement of x-ray diffraction dataconfirms the hexagonal symmetry. Scanning and transmission electron microscopymeasurements show hexagonal and rod-shape morphology for T = Co and Mn,respectively. The magnetic measurements indicate the presence of variableoxidation states of Mn/Co ions, but no long range ordering till 5~K. We findthat the Na$_{0.6}$MnO$_2$ is highly insulating whereas Na$_{0.7}$CoO$_2$ issemiconducting in nature. The conduction in Na$_{0.7}$CoO$_2$ takes placethrough both variable range hopping (VRH) as well as activation mechanisms indifferent temperature ranges. However, for Na$_{0.6}$MnO$_2$ the VRH prevailsat elevated temperatures. Furthermore, the coin cells have been fabricated andtested the electrochemical behavior using cyclic voltammetry, which confirmsthe reversibility of Na--ions during intercalation/de-intercalation.

Synthesis and physical properties of Na$_x$TO$_2$ (T=Mn, Co) nanostructures for cathode materials in Na--ion batteries