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<p>Iron-based mixed phosphates are considered as promising cathode materials for sodium-ion batteries (SIBs) due to their low cost, non-toxicity, and high structural stability. However, their electrochemical performance is limited by poor electronic conductivity and sluggish ion diffusion. In this study, Na<sub>4</sub>Fe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>(P<sub>2</sub>O<sub>7</sub>) with porous coral-like S-doped carbon (NFPP-U0.5%) is presented as cathode materials for SIBs. The porous coral-like structure of the S-doped carbon layer, along with the C–S–Fe interaction, significantly enhances both electronic conductivity and sodium ion diffusion. NFPP-U0.5% delivers excellent rate performance, achieving a capacity of 80.3 mAh g<sup>−1</sup> at 20 C. Moreover, the <i>in-situ</i> X-ray diffraction analysis reveals that the C–S–Fe interaction, combined with the unique carbon structure, contributes to a small lattice volume change during cycling. NFPP-U0.5% finally reached an ultra-long cycling life (capacity retention of 82.66% after 25,000 cycles at 20 C). The outstanding electrochemical performances and the unique interface interaction demonstrate that the S-doped carbon coating NFPP is of high potential as a cathode material for low cost and long-lasting cyclability energy storage system.</p>

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The interface interaction of sulfur-doped carbon boosting kinetics of Na4Fe3(PO4)2(P2O7) for high rate and stable sodium-ion batteries

  • 期刊论文

  • 发表日期：

    2025年9月10日

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  • Yuyang Cai,
  • Hanwen Cheng,
  • Zhuo Chen,
  • Hantao Xu,
  • Shidong Li,
  • Jinghao Li,
  • Yibo Zhang,
  • Li Zhao,
  • Zhenzhen Dou,
  • Lin Xu

摘要

Iron-based mixed phosphates are considered as promising cathode materials for sodium-ion batteries (SIBs) due to their low cost, non-toxicity, and high structural stability. However, their electrochemical performance is limited by poor electronic conductivity and sluggish ion diffusion. In this study, Na4Fe3(PO4)2(P2O7) with porous coral-like S-doped carbon (NFPP-U0.5%) is presented as cathode materials for SIBs. The porous coral-like structure of the S-doped carbon layer, along with the C–S–Fe interaction, significantly enhances both electronic conductivity and sodium ion diffusion. NFPP-U0.5% delivers excellent rate performance, achieving a capacity of 80.3 mAh g−1 at 20 C. Moreover, the in-situ X-ray diffraction analysis reveals that the C–S–Fe interaction, combined with the unique carbon structure, contributes to a small lattice volume change during cycling. NFPP-U0.5% finally reached an ultra-long cycling life (capacity retention of 82.66% after 25,000 cycles at 20 C). The outstanding electrochemical performances and the unique interface interaction demonstrate that the S-doped carbon coating NFPP is of high potential as a cathode material for low cost and long-lasting cyclability energy storage system.