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<p>N-RGO/Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> dual-modified Na<sub>2</sub>Fe<sub>0.6</sub>Mn<sub>0.4</sub>PO<sub>4</sub>F composites were prepared by sol–gel method combined with high-temperature calcination at 625&#xa0;°C. Electrochemical tests show that the initial discharge specific capacity of N-RGO/Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> -modified Na<sub>2</sub>Fe<sub>0.6</sub>Mn<sub>0.4</sub>PO<sub>4</sub>F composites is 149.27 mAh·g<sup>−1</sup> at a current density of 0.05&#xa0;C, and the discharge specific capacity can be maintained at approximately 101.89 mAh·g<sup>−1</sup> after 100 cycles. This accounts for 68.26% of its initial discharge specific capacity. Rate performance tests showed that after cycling the current density back to 0.2&#xa0;C, it was still able to recover to a discharge specific capacity close to 119 mAh·g<sup>−1</sup>. At the same time, the interfacial properties of the N-RGO/Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> dual-modified Na<sub>2</sub>Fe<sub>0.6</sub>Mn<sub>0.4</sub>PO<sub>4</sub>F composites were studied, and it was found that the capacity attenuation was due to irreversible structural changes such as agglomerated block cracking and structural collapse during multiple cycles, as well as the gradual thickening of the SEI film with the increase in cycle times. This study aims to apply N-RGO/Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> dual-modified Na<sub>2</sub>Fe<sub>0.6</sub>Mn<sub>0.4</sub>PO<sub>4</sub>F composites to cathode materials for sodium-ion batteries, providing a theoretical basis for the development of fluorinated poly-anion compounds.</p>

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Interface characteristics of N-RGO/Na3V2(PO4)3 dual-modified Na2Fe0.6Mn0.4PO4F for SIB cathodes

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Junjie Ma,
  • Wei Li,
  • Deyi Yang,
  • Zheng Liu,
  • Yuyuan Cao,
  • Shaocong Wang,
  • Guo-Cheng Han,
  • Qizhi Chen

摘要

N-RGO/Na3V2(PO4)3 dual-modified Na2Fe0.6Mn0.4PO4F composites were prepared by sol–gel method combined with high-temperature calcination at 625 °C. Electrochemical tests show that the initial discharge specific capacity of N-RGO/Na3V2(PO4)3 -modified Na2Fe0.6Mn0.4PO4F composites is 149.27 mAh·g−1 at a current density of 0.05 C, and the discharge specific capacity can be maintained at approximately 101.89 mAh·g−1 after 100 cycles. This accounts for 68.26% of its initial discharge specific capacity. Rate performance tests showed that after cycling the current density back to 0.2 C, it was still able to recover to a discharge specific capacity close to 119 mAh·g−1. At the same time, the interfacial properties of the N-RGO/Na3V2(PO4)3 dual-modified Na2Fe0.6Mn0.4PO4F composites were studied, and it was found that the capacity attenuation was due to irreversible structural changes such as agglomerated block cracking and structural collapse during multiple cycles, as well as the gradual thickening of the SEI film with the increase in cycle times. This study aims to apply N-RGO/Na3V2(PO4)3 dual-modified Na2Fe0.6Mn0.4PO4F composites to cathode materials for sodium-ion batteries, providing a theoretical basis for the development of fluorinated poly-anion compounds.