Mn-Doped Na4Fe3(PO4)2P2O7 as a Low-Cost and High-Performance Cathode Material for Sodium-Ion Batteries,Energy & Fuels

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Mn-Doped Na4Fe3(PO4)2P2O7 as a Low-Cost and High-Performance Cathode Material for Sodium-Ion Batteries
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-03-31 , DOI: 10.1021/acs.energyfuels.3c00340
Qingdong Tao _{1,

2} , Haiyang Ding _{1,

2} , Xin Tang _{1,

2} , Kaibo Zhang _{1,

2} , Jinhan Teng _{1,

2} , Haomiao Zhao _{1,

2} , Jing Li _{1,

2}

Affiliation

Na₄Fe₃(PO₄)₂P₂O₇ (NFPP) is considered to be an ideal cathode material for sodium-ion batteries due to its high theoretical capacity, stable structure, small volume change, low cost, and nontoxicity. However, the inherent low electronic conductivity of polyanionic materials limits the application of this material. In this work, we improved the electronic conductivity and structural stability of the material through a dual modification synergistic strategy of manganese ion doping and surface carbon coating and prepared Na₄Fe_2.9Mn_0.1(PO₄)₂P₂O₇@C (0.1 Mn-NFPP@C) composites by a simple mechanical-assisted chemical synthesis method. It can release 119.6 mAh g^–1 at 0.1C. The capacity retention rate is 97.4% after 100 cycles at 1C and 84.8% after 3000 cycles at 10C. Many tests and calculations in this work also show that 0.1 Mn-NFPP@C modified by Mn²⁺ doping and carbon coating has higher electronic conductivity and electrochemical kinetics and thus exhibits better electrochemical performance.

中文翻译：

Mn掺杂的Na4Fe3(PO4)2P2O7作为钠离子电池的低成本和高性能正极材料

Na ₄ Fe ₃ (PO ₄ ) ₂ P ₂ O ₇ (NFPP)具有理论容量高、结构稳定、体积变化小、成本低、无毒等优点，被认为是理想的钠离子电池正极材料。然而，聚阴离子材料固有的低电子电导率限制了该材料的应用。在这项工作中，我们通过锰离子掺杂和表面碳涂层的双重改性协同策略提高了材料的电子导电性和结构稳定性，并制备了Na 4 _Fe 2.9 _Mn 0.1 ₍ PO ₄ ) ₂ P ₂O ₇ @C (0.1 Mn-NFPP@C) 复合材料通过简单的机械辅助化学合成方法。它可以在 0.1C 下释放 119.6 mAh g ^–1。1C 循环 100 次后容量保持率为 97.4%，10C 循环 3000 次后容量保持率为 84.8%。^{本工作中的许多测试和计算也表明，Mn 2+}掺杂和碳包覆改性的0.1 Mn-NFPP@C具有更高的电子电导率和电化学动力学，从而表现出更好的电化学性能。

更新日期：2023-03-31

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