Growth mechanism and magnetic and electrochemical properties of Na0.44MnO2 nanorods as cathode material for Na-ion batteries

Demirel S., Oz E., ALTIN E., ALTIN S., Bayri A., KAYA P., ...Daha Fazla

Materials Characterization, cilt.105, ss.104-112, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 105
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1016/j.matchar.2015.05.005
  • Dergi Adı: Materials Characterization
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.104-112
  • Anahtar Kelimeler: Na0.44MnO2 nanorod, Growth mechanism, Na-ion battery, SINGLE-CRYSTALLINE NA0.44MNO2, SPINEL LIMN2O4 NANOWIRES, LITHIUM-ION, VAPOR-PRESSURE, THERMODYNAMIC CONSIDERATIONS, SODIUM INTERCALATION, ELECTRODE MATERIALS, STORAGE, PERFORMANCE, INSERTION/DEINSERTION
  • Anadolu Üniversitesi Adresli: Evet

Özet

© 2015 Published by Elsevier Inc.Nanorods of Na0.44MnO2 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 Na0.44MnO2 nanorods via solid state synthesis and their physical properties. The structure and the morphology of the Na0.44MnO2 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 25 K and the μeff is determined as 3.41 and 3.24 μB from the χ-T curve and theoretical calculation, respectively. The electronic configuration and spin state of Mn3+ and Mn4+ 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.