Medium-Entropy Engineering and 3D Carbon Network Synergy in Na <sub>3</sub> V <sub>1.4</sub> Fe <sub>0.1</sub> Mn <sub>0.2</sub> Cr <sub>0.2</sub> Zr <sub>0.1</sub> (PO <sub>4</sub> ) <sub>2</sub> O <sub>2</sub> F@C for High-Performance Sodium-Ion Ba

This study introduces ME-Na<sub>3</sub>V<sub>1.4</sub>Fe<sub>0.1</sub>Mn<sub>0.2</sub>Cr<sub>0.2</sub>Zr<sub>0.1</sub>(PO<sub>4</sub>)<sub>2</sub>O<sub>2</sub>F@C (ME-NVOPF 1.01@C), a medium-entropy engineered sodium-ion battery (SIB) cathode material, addressing low conductivity of NASICON-type Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>O<sub>2</sub>F. 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<sup>+</sup> insertion/extraction. Density functional theory calculations demonstrate that Na<sup>+</sup> 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<sup>+</sup> diffusion coefficient of ∼10<sup>-11</sup> cm<sup>2</sup>·s<sup>-1</sup>. ME-NVOPF 1.01@C delivers 97.2 mAh·g<sup>-1</sup> 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.

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Journal
ACS Applied Materials & Interfaces
Published
2025-12-31
DOI
https://doi.org/10.1021/acsami.5c20868
Primary Topic
Advancements in Battery Materials
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article
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article

Medium-Entropy Engineering and 3D Carbon Network Synergy in Na 3 V 1.4 Fe 0.1 Mn 0.2 Cr 0.2 Zr 0.1 (PO 4 ) 2 O 2 F@C for High-Performance Sodium-Ion Ba

Najun Liu, Linna Guo, Kan Mi, Xiaolei Jiang et al.
ACS Applied Materials & Interfaces
Advancements in Battery Materials
article

Medium-Entropy Engineering and 3D Carbon Network Synergy in Na 3 V 1.4 Fe 0.1 Mn 0.2 Cr 0.2 Zr 0.1 (PO 4 ) 2 O 2 F@C for High-Performance Sodium-Ion Ba

Najun Liu, Linna Guo, Kan Mi, Xiaolei Jiang, Fangdong Hu, Huili Peng, Mingbo Shao, Guanglu Jiang
article en

Abstract

This study introduces ME-Na<sub>3</sub>V<sub>1.4</sub>Fe<sub>0.1</sub>Mn<sub>0.2</sub>Cr<sub>0.2</sub>Zr<sub>0.1</sub>(PO<sub>4</sub>)<sub>2</sub>O<sub>2</sub>F@C (ME-NVOPF 1.01@C), a medium-entropy engineered sodium-ion battery (SIB) cathode material, addressing low conductivity of NASICON-type Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>O<sub>2</sub>F. 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<sup>+</sup> insertion/extraction. Density functional theory calculations demonstrate that Na<sup>+</sup> 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<sup>+</sup> diffusion coefficient of ∼10<sup>-11</sup> cm<sup>2</sup>·s<sup>-1</sup>. ME-NVOPF 1.01@C delivers 97.2 mAh·g<sup>-1</sup> 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.

ACS Applied Materials & InterfacesVol. 18(1)
Linyi University (CN)
Openalex Percentile: Top 41%
Advancements in Battery Materials
DOISourceOpenAlex
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Medium-Entropy Engineering and 3D Carbon Network Synergy in Na <sub>3</sub> V <sub>1.4</sub> Fe <sub>0.1</sub> Mn <sub>0.2</sub> Cr <sub>0.2</sub> Zr <sub>0.1</sub> (PO <sub>4</sub> ) <sub>2</sub> O <sub>2</sub> F@C for High-Performance Sodium-Ion Ba — Najun Liu, Linna Guo, et al. · ACS Applied Materials & Interfaces (2025) | TGRS Research Map | TGRS