Date of Graduation
Master of Science in Materials Science
Physics, Astronomy, and Materials Science
The proliferation of renewable energy sources and the promising market for net-scale battery applications immediately increases the need for electrochemical energy storage technology. Sodium (Na) components are more accessible and less expensive than lithium. Being a sodium-based material with a high-power density provided by Na-ion diffusion, NaxMnO2- δ is a strong contender for large-scale Sodium-ion-battery (SIB) applications. In the current study, NaxMnO2- δ is created using a solid-state reaction technique, and investigated structural, electrical, and electrochemical properties of materials were investigated using X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), UV-VIS spectroscopy, and X-ray photoelectron spectroscopy (XPS). The Rietveld refinement on the respective XRD pattern led to a hexagonal structure with space group P63/mmc. Raman spectroscopy provides information about the structural fingerprint of the prepared powders by identifying the vibrational modes. XPS analysis was carried out to investigate the Mn valence of NaxMnO2- δ. Electrochemical charge-discharge cycling was performed from 2.0- 4.2 V vs Na+/Na for C/10 where the initial discharge capacity 102 mA h/g-1 and 90% capacity retention after 20 cycles for NaxMnO2- δ. An ideal layered P2-type NaxMnO2-δ cathode calcined at 400°C has the highest specific discharge capacity of 130 mAh/g at 0.1C with capacity retention of approximately 99% and average coulombic efficiency of 98% after 20 cycles compared to 300°C in between 2.0-4.2V range (Na+/Na). These findings will encourage more investigation into SIB.
SIB, solid-state technique, Rietveld refinement, capacity retention, coulombic efficiency
Other Materials Science and Engineering
© Zia Uddin Mahmud
Mahmud, Zia Uddin, "A Study of Synthesis and Characterization of Naxmno2-δ as a Cathode Material for Sodium-Ion Battery" (2023). MSU Graduate Theses. 3887.
Available for download on Sunday, May 31, 2026