Related Experiment Video
Updated: Jan 7, 2026
Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
Medium-Entropy Engineering and 3D Carbon Network Synergy in Na3V1.4Fe0.1Mn0.2Cr0.2Zr0.1(PO4)2O2F@C for
Najun Liu1,2, Guanglu Jiang1,2, Mingbo Shao1,2
1School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, P. R. China.
Abstract:
This study introduces ME-Na3V1.4Fe0.1Mn0.2Cr0.2Zr0.1(PO4)2O2F@C (ME-NVOPF 1.01@C), a medium-entropy engineered sodium-ion battery (SIB) cathode material, addressing low conductivity of NASICON-type Na3V2(PO4)2O2F. Medium-entropy doping regulates the energy band structure and vanadium coordination, enhancing electronic conductivity and enabling a nonphase-change reaction with minimal volume change during Na+ insertion/extraction. Density functional theory calculations demonstrate that Na+ migration barriers and a narrowed bandgap were reduced, improving redox reversibility. The 3D carbon network further boosts the conductivity and sodium storage kinetics, achieving a Na+ diffusion coefficient of ∼10-11 cm2·s-1. ME-NVOPF 1.01@C delivers 97.2 mAh·g-1 at 0.1 C, with 72% capacity retention after 4500 cycles at 5 C, confirming exceptional cycling stability. This work elucidates the entropy-performance correlation and highlights the superiority of medium-entropy materials in overcoming the inherent limitations of polyanion cathodes, providing a strategic pathway for designing higher electrochemical performance sodium-ion battery materials.
