Na₃V₂(PO₄)₃ (NVP) is recognized as one of the most promising NASICON-type cathodes for sodium-ion storage. Enhancing electronic conductivity and further ensuring long-term structural stability when activating the high-voltage V⁴⁺/V⁵⁺ redox reaction is crucial for the practical application of NVP cathodes. In this study, a high-entropy NVP cathode with carbon coating (Na₃V_1.5(CrMnFeMgAl)_0.5(PO₄)₃@C, HE-NVMP@C) has been designed and synthesized. Due to the enhanced electronic/ionic conductivity facilitated by the carbon coating and lattice distortion from the high-entropy effect, HE-NVMP@C exhibits improved high-rate performance. Additionally, benefiting from the collaboration between the doped heteroatoms, HE-NVMP@C can effectively activate V³⁺/V⁴⁺/V⁵⁺ redox reactions within the 2.5–4.3 V voltage window while maintaining excellent structural stability over extended cycles. This work provides an efficient approach to enhance the electrochemical performances of NASICON-type cathodes for sodium-ion batteries.

中文翻译：

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用于先进钠离子电池的高熵 NASICON 型阴极的协同效应


Na₃V₂（PO₄）₃ （NVP） 被认为是最有前途的钠离子存储 NASICON 型阴极之一。在激活高压 V⁴⁺/V⁵⁺ 氧化还原反应时，增强电子导电性并进一步确保长期结构稳定性对于 NVP 阴极的实际应用至关重要。本研究设计合成了一种碳涂层的高熵NVP阴极（Na₃V_1.5（CrMnFeMgAl）_0.5（PO₄）₃@C，HE-NVMP@C）。由于碳涂层促进了增强的电子/离子导电性和高熵效应引起的晶格畸变，HE-NVMP@C 表现出改进的高倍率性能。此外，得益于掺杂杂原子之间的合作，HE-NVMP@C 可以在 2.5–4.3 V 电压窗口内有效激活 V³⁺/V⁴⁺/V⁵⁺ 氧化还原反应，同时在延长循环中保持出色的结构稳定性。这项工作提供了一种有效的方法来增强钠离子电池 NASICON 型阴极的电化学性能。