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Updated: Jun 26, 2026

Preparation and Reactivity of Gasless Nanostructured Energetic Materials
Published on: April 2, 2015
Boosting Na+ Storage and Thermal Stability of Na4Fe3(PO4)2P2O7 via High-Entropy Engineering
Hao Wang1, Zhizhen Zhang2, Youqi Chu1
1Guangzhou Key Laboratory for Surface Chemistry of Energy Materials, New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou 510006, P. R. China.
None:
Na4Fe3(PO4)2P2O7 (NFPP) possesses a stable NASICON-type framework and a suitable redox potential, making it attractive as a sodium-ion battery cathode. Yet, its utility is limited by poor electronic conductivity and sluggish Na+ diffusion. Here, we design a high-entropy Na4Fe2.75Mn0.05Mg0.05Cr0.05Cu0.05Al0.05(PO4)2P2O7 (HE-NFPP) synthesized through spray drying and sintering. HE-NFPP achieves a compaction density of 2.34 g/cm3 under 300 MPa, rivaling that of LiFePO4. The high-entropy incorporation of Mn, Mg, Cr, Cu, and Al enables enhanced electron transitions and improved intrinsic conductivity. Simultaneously, the creation of wide, interconnected 3D Na+ channels significantly reduces migration barriers, accelerating transport and electrode kinetics. In situ optical fiber thermometry reveals suppressed heat evolution, leading to enhanced thermal stability, uniform reaction processes, and safer operation. Additionally, the redistribution of the local electrostatic field minimizes cation repulsion and mechanical strain during Na+ (de)intercalation, ensuring structural robustness. These synergistic effects yield excellent rate capability and cycling durability, underscoring the potential of entropy engineering as a versatile strategy to optimize polyanionic cathodes for next-generation sodium-ion batteries.
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