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<p>Two-dimensional MXenes combine metallic conductivity and tunable surface chemistry, making them attractive for energy storage. Their application, however, is constrained by rapid oxidation and restacking. Here we report surface functionalization of MXene using polyvinylpyrrolidone-catechol at room temperature to support higher oxidation stability and stable dispersion at ambient conditions. When coupled with hollow silica (HS) to form a composite anode for sodium-ion batteries, the HS buffers the passivation due to sodiation while the functionalized-MXene network ensures efficient electron/ion transport. The functionalized-MXene/HS anode achieves ~841 mAh g<sup>-1</sup> at 0.1 A g<sup>-1</sup> and ~491 mAh g<sup>-1</sup> at 0.5 A g<sup>-1</sup>, outperforming bare HS (444 and 191 mAh g<sup>-1</sup>), along with ~95% enhancement in ionic conductivity. The full cell studies against Prussian blue analogue cathode proved the high reversible capacity. This scalable surface chemistry approach stabilizes MXenes and unlocks their potential in high-performance sodium-ion batteries and beyond.</p>

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Polymer-ligand functionalized MXene and hollow silica composite anode for improved sodium-ion batteries

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年2月14日

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  • Sasan Rostami,
  • Young Ho Park,
  • Ijin Yun,
  • Chaelin Shin,
  • Jiseok Ha,
  • Seonjae Kim,
  • G. Murali,
  • Su Cheol Shin,
  • Seung Jun Lee,
  • Jeevan Kumar Reddy Modigunta,
  • Soorathep Kheawhom,
  • Insik In

摘要

Two-dimensional MXenes combine metallic conductivity and tunable surface chemistry, making them attractive for energy storage. Their application, however, is constrained by rapid oxidation and restacking. Here we report surface functionalization of MXene using polyvinylpyrrolidone-catechol at room temperature to support higher oxidation stability and stable dispersion at ambient conditions. When coupled with hollow silica (HS) to form a composite anode for sodium-ion batteries, the HS buffers the passivation due to sodiation while the functionalized-MXene network ensures efficient electron/ion transport. The functionalized-MXene/HS anode achieves ~841 mAh g-1 at 0.1 A g-1 and ~491 mAh g-1 at 0.5 A g-1, outperforming bare HS (444 and 191 mAh g-1), along with ~95% enhancement in ionic conductivity. The full cell studies against Prussian blue analogue cathode proved the high reversible capacity. This scalable surface chemistry approach stabilizes MXenes and unlocks their potential in high-performance sodium-ion batteries and beyond.