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Abstract <p>In the lithium–sulfur (Li–S) batteries, developing catalytic materials to accelerate polysulfide redox kinetics and effectively mitigate the shuttle effect is crucial, as nonpolar carbon materials provide only physical confinement without offering catalytic activity. In this work, a novel functional interlayer is constructed by uniformly anchoring silver quantum dots (AgQDs) onto a MXene substrate, forming an AgQDs@MXene composite. This engineered interlayer is introduced into Li–S batteries to simultaneously address the challenges of polysulfide shuttle and sluggish redox kinetics. The abundant surface functional groups and high conductivity of MXene, coupled with the strong chemisorptive interactions and catalytic activity of AgQDs, enable effective immobilization of soluble lithium polysulfides and accelerated conversion reactions during cycling. As a result, Li–S batteries assembled with the AgQDs@MXene interlayer exhibit remarkable electrochemical performance, including enhanced capacity retention, prolonged cycling stability, and excellent rate capability. These improvements significantly outperform cells with conventional polypropylene (PP) separators, highlighting the potential of AgQDs@MXene as a multifunctional interface for high-energy–density and long-life Li–S batteries.</p> Graphical abstract <p></p>

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MXene-supported silver quantum dots as a new catalytic–adsorptive interlayer strategy for high-energy Li–S batteries

  • 期刊论文

  • 发表日期：

    2026年5月24日

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  • Qiuping Zhang,
  • Mengyuan Ran,
  • Kun Cui,
  • Xiaojie Yang,
  • Hao Zhang,
  • Lina Xiao,
  • Yanling Wu,
  • Zhuosen Wang

摘要

Abstract

In the lithium–sulfur (Li–S) batteries, developing catalytic materials to accelerate polysulfide redox kinetics and effectively mitigate the shuttle effect is crucial, as nonpolar carbon materials provide only physical confinement without offering catalytic activity. In this work, a novel functional interlayer is constructed by uniformly anchoring silver quantum dots (AgQDs) onto a MXene substrate, forming an AgQDs@MXene composite. This engineered interlayer is introduced into Li–S batteries to simultaneously address the challenges of polysulfide shuttle and sluggish redox kinetics. The abundant surface functional groups and high conductivity of MXene, coupled with the strong chemisorptive interactions and catalytic activity of AgQDs, enable effective immobilization of soluble lithium polysulfides and accelerated conversion reactions during cycling. As a result, Li–S batteries assembled with the AgQDs@MXene interlayer exhibit remarkable electrochemical performance, including enhanced capacity retention, prolonged cycling stability, and excellent rate capability. These improvements significantly outperform cells with conventional polypropylene (PP) separators, highlighting the potential of AgQDs@MXene as a multifunctional interface for high-energy–density and long-life Li–S batteries.

Graphical abstract