Investigation of the Electrical and Dielectric Properties of NaMnO<sub>2</sub> Solid Solution as a Cathode Active for Sodium‐Ion Batteries
Sudhansu Sekhar Hota, Debasish Panda, Praveen Priyaranjan Nayak, Ram Naresh Prasad Choudhary
Abstract
Ceramic dielectrics have been widely researched for their high power density and rapid charge/discharge capabilities. This article discusses a study on the structural, dielectric, and conductivity characteristics of polycrystalline solid solution NaMnO 2 ternary oxides synthesized using a high‐temperature solid‐state reaction method. The crystalline structure of the samples is examined through X‐ray diffraction, while scanning electron microscopy images revealed a dense microstructure. Modulus graphs demonstrated non‐Debye behavior, and frequency‐dependent conductivity is analyzed using Jonscher's power law. The variation of the power law exponent with temperature indicates the existence of different conduction mechanisms. Impedance analysis highlighted the effects of grain and grain boundaries, as well as a negative temperature coefficient of resistance for negative temperature coefficient thermistor applications. Analysis of dielectric permittivity indicated a high dielectric constant at low frequencies, suggesting the presence of both space charge and dipolar polarizations, and the solid solution material has potential for energy storage applications.