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<p>The persistent shuttle effect of lithium polysulfides (LiPSs) remains a major bottleneck hindering the widespread commercialization of lithium-sulfur (Li-S) batteries. Among the proposed solutions, MgO@carbon (MgO@C) composite interlayers have emerged as a highly effective strategy for suppressing LiPS migration through chemical adsorption and catalytic conversion. However, conventional synthesis routes for these materials often rely on costly and intricate chemical processes, limiting their scalability. In this study, we present an eco-friendly and cost-effective approach by fabricating MgO@C composites from dye sludge-derived carbon. The resulting nanoporous MgO@C interlayer exhibits strong hydrophilicity and abundant active sites, enabling efficient polysulfide immobilization via chemisorption while simultaneously accelerating sulfur redox kinetics. This dual functionality not only mitigates the shuttle effect but also enhances battery capacity and cycling stability - delivering exceptional electrochemical performance. This work offers a strategic approach for converting waste into valuable materials, paving the way for the scalable fabrication of high-performance interlayers in practical Li-S battery applications.</p>

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Upcycling dye sludge into functional MgO@C-Coated PP separators: a sustainable approach for advanced lithium-sulfur batteries

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Lingwen Zhang,
  • Wenqing Qin,
  • Jifa Long,
  • Qi Xiao,
  • Suping Huang

摘要

The persistent shuttle effect of lithium polysulfides (LiPSs) remains a major bottleneck hindering the widespread commercialization of lithium-sulfur (Li-S) batteries. Among the proposed solutions, MgO@carbon (MgO@C) composite interlayers have emerged as a highly effective strategy for suppressing LiPS migration through chemical adsorption and catalytic conversion. However, conventional synthesis routes for these materials often rely on costly and intricate chemical processes, limiting their scalability. In this study, we present an eco-friendly and cost-effective approach by fabricating MgO@C composites from dye sludge-derived carbon. The resulting nanoporous MgO@C interlayer exhibits strong hydrophilicity and abundant active sites, enabling efficient polysulfide immobilization via chemisorption while simultaneously accelerating sulfur redox kinetics. This dual functionality not only mitigates the shuttle effect but also enhances battery capacity and cycling stability - delivering exceptional electrochemical performance. This work offers a strategic approach for converting waste into valuable materials, paving the way for the scalable fabrication of high-performance interlayers in practical Li-S battery applications.