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<p>Sodium-ion batteries (SIBs) have emerged as a promising complement to lithium-ion counterparts, owing to their advantages of abundant resources, low cost, and high safety. Among the polyanion-type cathode materials, Na<sub>3</sub>Fe<sub>2</sub>(PO<sub>4</sub>)(P<sub>2</sub>O<sub>7</sub>) (NFPP) has garnered significant attention due to its stable three-dimensional framework and environmentally friendly characteristics. However, its inherent low electronic conductivity has hindered practical application. This work presents a modification strategy to address this limitation. By constructing a three-dimensional continuous conductive network within the NFPP composite material (NFPP@C/CNT-rGO) through the integration of carbon nanotubes (CNT), reduced graphene oxide (rGO), and amorphous carbon coating, the electronic conductivity is significantly enhanced, and sodium-ion diffusion sites are optimized. Electrochemical evaluation demonstrates that the NFPP@C/CNT-rGO half-cell delivers a reversible capacity of 113.3 mAh g⁻¹ at 0.1&#xa0;C, with a capacity retention rate of 70.7% after 6000 cycles at a high rate of 10&#xa0;C, while maintaining a stable Coulombic efficiency close to 100%. Notably, at 20&#xa0;C, the capacity reaches 70.2 mAh g⁻¹, far surpassing that of NFPP@C. Furthermore, the assembled NFPP@C/CNT-rGO || HC full cell exhibits a capacity retention rate of 78.4% after 300 cycles at 1&#xa0;C, validating the material’s practical application potential. This study introduces a novel approach to enhance the performance of iron-based polyanion cathodes in sodium-ion batteries by constructing carbon conductive networks with multi-morphological structures, thereby paving the way for the practical application of sodium-ion batteries.</p>

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Multi-morphological carbon cross-linked composite enhances the high-rate performance and ultra-long cycling stability of Na3Fe2(PO4)(P2O7) cathode

  • 期刊论文

  • 发表日期：

    2026年1月12日

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  • Hang Song,
  • Kaihua Liu,
  • Yinghan Liu,
  • Chuanlong Ji,
  • Yuhao He,
  • Keyan Bao,
  • Wutao Mao

摘要

Sodium-ion batteries (SIBs) have emerged as a promising complement to lithium-ion counterparts, owing to their advantages of abundant resources, low cost, and high safety. Among the polyanion-type cathode materials, Na3Fe2(PO4)(P2O7) (NFPP) has garnered significant attention due to its stable three-dimensional framework and environmentally friendly characteristics. However, its inherent low electronic conductivity has hindered practical application. This work presents a modification strategy to address this limitation. By constructing a three-dimensional continuous conductive network within the NFPP composite material (NFPP@C/CNT-rGO) through the integration of carbon nanotubes (CNT), reduced graphene oxide (rGO), and amorphous carbon coating, the electronic conductivity is significantly enhanced, and sodium-ion diffusion sites are optimized. Electrochemical evaluation demonstrates that the NFPP@C/CNT-rGO half-cell delivers a reversible capacity of 113.3 mAh g⁻¹ at 0.1 C, with a capacity retention rate of 70.7% after 6000 cycles at a high rate of 10 C, while maintaining a stable Coulombic efficiency close to 100%. Notably, at 20 C, the capacity reaches 70.2 mAh g⁻¹, far surpassing that of NFPP@C. Furthermore, the assembled NFPP@C/CNT-rGO || HC full cell exhibits a capacity retention rate of 78.4% after 300 cycles at 1 C, validating the material’s practical application potential. This study introduces a novel approach to enhance the performance of iron-based polyanion cathodes in sodium-ion batteries by constructing carbon conductive networks with multi-morphological structures, thereby paving the way for the practical application of sodium-ion batteries.