Nanorods of Na 0.44 MnO 2 are a promising cathode material for Na-ion batteries due to their large surface area and single crystalline structure. We report the growth mechanism of Na 0.44 MnO 2 nanorods via solid state synthesis and their physical properties. The structure and the morphology of the Na 0.44 MnO 2 nanorods are investigated by X-ray diffraction (XRD), scanning and tunneling electron microscopy (SEM and TEM), and energy-dispersive X-ray (EDX) techniques. The growth mechanism of the rods is investigated and the effects of vapor pressure and partial melting of Na-rich regions are discussed. The magnetic measurements show an antiferromagnetic phase transition at 25K and the μ eff is determined as 3.41 and 3.24μ B from the χ–T curve and theoretical calculation, respectively. The electronic configuration and spin state of Mn 3+ and Mn 4+ are discussed in detail. The electrochemical properties of the cell fabricated using the nanorods are investigated and the peaks in the voltammogram are attributed to the diffusion of Na ions from different sites. Na intercalation process is explained by one and two Margules and van Laar models.