Probing the Compositional and Structural Effects on the Electrochemical Performance of Na(Mn-Fe-Ni)O₂ Cathodes in Sodium-Ion Batteries.

ABSTRACT: This study systematically investigates an Mn-Fe-Ni pseudo-ternary system for Na(Mn-Fe-Ni)O₂ cathodes, focusing on the effects of varying transition metal fractions on structural and electrochemical properties. X-ray diffraction reveals that increasing Mn content induces biphasic behavior. A higher Ni content reduces the c parameter, while higher Mn and Fe concentrations expand the lattice. Average particle size increases with an increase in Mn content and Fe/Ni ratio. NaMn_0.500Fe_0.125Ni_0.375O₂ delivers a high specific capacity of ~149 mAh g^-1 in the 2.0-4.0 V range. Galvanostatic charge-discharge and dQ/dV versus V curves suggest that a Ni/Fe ratio > 1 enhances specific capacity and lowers voltage polarization in the

SUBMITTER: Saxena S 

PROVIDER: S-EPMC12396823 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature