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Updated: Jul 16, 2026

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
Lanthanum-Induced Phase Engineering Enables Enhanced Structural Stability and Fast Na+ Transport in P2/O3 Layered
Haitao Xue1, Zhiyue Lian1, Yanjiao Liu1
1School of Chemistry and Chemical Engineering, Inner Mongolia University of Science & Technology, Baotou, Inner Mongolia, 014010, China.
Abstract:
Fe/Mn-based P2-type layered oxides are promising cathodes for sodium-ion batteries (SIBs), yet suffer from poor cycling stability due to Jahn-Teller distortion of Mn3+ and irreversible P2-Z phase transitions. In this study, a multi-element doping strategy involving Cu, Mg, and La is employed to construct a structurally stable P2/O3 composite, Na0.67Fe0.19Mn0.5Cu0.2Mg0.1La0.01O2 (FMCML), via a sol-gel method and high-temperature calcination. The synergistic doping suppresses Mn3+ redox activity, mitigates lattice distortion, and enhances Na+ diffusion kinetics. Notably, La3+ incorporation induces LaO6 octahedral formation, which refines particle size and boosts crystallinity. As a result, FMCML exhibits outstanding rate performance and long-term durability, with capacity retentions of 99.11%, 87.21%, and 74.92% after 100, 300, and 1600 cycles at 200, 1000, and 2000 mA·g-1, respectively. The dual-phase structure promotes structural reversibility, suppresses Na+/vacancy ordering, and enhances ambient air stability. This work offers a practical approach to designing robust layered oxide cathodes through rational phase and composition engineering, paving the way for next-generation high-performance SIBs.
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