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<p>Wide-temperature applications of sodium-ion batteries (SIBs) are severely limited by the sluggish ion insertion/diffusion kinetics of conversion-type anodes. Quantum-sized transition metal dichalcogenides possess unique advantages of charge delocalization and enrich uncoordinated electrons and short-range transfer kinetics, which are crucial to achieve rapid low-temperature charge transfer and high-temperature interface stability. Herein, a quantum-scale FeS<sub>2</sub> loaded on three-dimensional Ti<sub>3</sub>C<sub>2</sub> MXene skeletons (FeS<sub>2</sub> QD/MXene) fabricated as SIBs anode, demonstrating impressive performance under wide-temperature conditions (− 35 to 65&#xa0;°C). The theoretical calculations combined with experimental characterization interprets that the unsaturated coordination edges of FeS<sub>2</sub> QD can induce delocalized electronic regions, which reduces electrostatic potential and significantly facilitates efficient Na<sup>+</sup> diffusion across a broad temperature range. Moreover, the Ti<sub>3</sub>C<sub>2</sub> skeleton reinforces structural integrity via Fe–O–Ti bonding, while enabling excellent dispersion of FeS<sub>2</sub> QD. As expected, FeS<sub>2</sub> QD/MXene anode harvests capacities of 255.2 and 424.9 mAh g<sup>−1</sup> at 0.1 A g<sup>−1</sup> under − 35 and 65&#xa0;°C, and the energy density of FeS<sub>2</sub> QD/MXene//NVP full cell can reach to 162.4 Wh kg<sup>−1</sup> at − 35&#xa0;°C, highlighting its practical potential for wide-temperatures conditions. This work extends the uncoordinated regions induced by quantum-size effects for exceptional Na<sup>+</sup> ion storage and diffusion performance at wide-temperatures environment.</p>

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Quantum-Size FeS2 with Delocalized Electronic Regions Enable High-Performance Sodium-Ion Batteries Across Wide Temperatures

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月29日

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  • Tianlin Li,
  • Danyang Zhao,
  • Meiyu Shi,
  • Chao Tian,
  • Jie Yi,
  • Qing Yin,
  • Yongzhi Li,
  • Bin Xiao,
  • Jiqiu Qi,
  • Peng Cao,
  • Yanwei Sui

摘要

Wide-temperature applications of sodium-ion batteries (SIBs) are severely limited by the sluggish ion insertion/diffusion kinetics of conversion-type anodes. Quantum-sized transition metal dichalcogenides possess unique advantages of charge delocalization and enrich uncoordinated electrons and short-range transfer kinetics, which are crucial to achieve rapid low-temperature charge transfer and high-temperature interface stability. Herein, a quantum-scale FeS2 loaded on three-dimensional Ti3C2 MXene skeletons (FeS2 QD/MXene) fabricated as SIBs anode, demonstrating impressive performance under wide-temperature conditions (− 35 to 65 °C). The theoretical calculations combined with experimental characterization interprets that the unsaturated coordination edges of FeS2 QD can induce delocalized electronic regions, which reduces electrostatic potential and significantly facilitates efficient Na+ diffusion across a broad temperature range. Moreover, the Ti3C2 skeleton reinforces structural integrity via Fe–O–Ti bonding, while enabling excellent dispersion of FeS2 QD. As expected, FeS2 QD/MXene anode harvests capacities of 255.2 and 424.9 mAh g−1 at 0.1 A g−1 under − 35 and 65 °C, and the energy density of FeS2 QD/MXene//NVP full cell can reach to 162.4 Wh kg−1 at − 35 °C, highlighting its practical potential for wide-temperatures conditions. This work extends the uncoordinated regions induced by quantum-size effects for exceptional Na+ ion storage and diffusion performance at wide-temperatures environment.