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

IF 7.4 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science China Materials Pub Date : 2025-09-10 DOI:10.1007/s40843-025-3516-2

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

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引用次数: 0

Abstract

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.

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高倍率稳定钠离子电池中掺硫碳对Na4Fe3(PO4)2（P2O7）界面的促进动力学

铁基混合磷酸盐具有成本低、无毒、结构稳定性高等优点，被认为是钠离子电池极具发展前景的正极材料。然而，它们的电化学性能受到电子导电性差和离子扩散缓慢的限制。在这项研究中，Na4Fe3(PO4)2（P2O7）与多孔珊瑚样s掺杂碳（NFPP-U0.5%）作为sib的正极材料。s掺杂碳层的多孔珊瑚状结构以及C-S-Fe相互作用显著增强了电子导电性和钠离子扩散。NFPP-U0.5%具有优异的倍率性能，在20℃下达到80.3 mAh g−1的容量。此外，原位x射线衍射分析表明，C-S-Fe相互作用与独特的碳结构相结合，有助于在循环过程中产生较小的晶格体积变化。NFPP-U0.5%最终达到超长循环寿命（在20℃下循环25000次后容量保持率为82.66%）。优异的电化学性能和独特的界面相互作用表明，s掺杂碳涂层NFPP作为低成本、长效循环储能系统的正极材料具有很高的潜力。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.