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<p>The development of cathodes with high sulfur loading is essential for practical high-energy lithium–sulfur batteries. The binder functions as a polymeric framework that integrates active materials and conductive agents, while preserving electrode integrity and influencing electrochemical behavior. In lithium–sulfur systems, binders with polar functional groups that interact strongly with lithium polysulfides are crucial to suppress the shuttle effect and enhance cycling stability. Here, we design a multifunctional binder, poly(amic acid)–dextrin copolymer (PDB), which incorporates amide, carboxyl, hydroxyl, and imide groups within a three-dimensional network. This architecture provides mechanical robustness, immobilizes polysulfides, accelerates redox kinetics, and improves interfacial contact among electrode components. As a result, lithium–sulfur cells with PDB deliver a specific capacity of 590 mAh g<sup>− 1</sup> after 100 cycles at 0.5&#xa0;C, and maintain 357 mAh g<sup>− 1</sup> under a high sulfur loading of 9.0&#xa0;mg cm<sup>− 2</sup> after 100 cycles at 0.2&#xa0;C. This work demonstrates that multifunctional binder systems play a pivotal role in advancing lithium–sulfur batteries toward scalable, high-performance, and cost-effective energy storage technologies.</p>

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In-situ engineered three-dimensional hydrogen-bonded co-binder network to boost lithium–sulfur batteries

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月16日

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  • Ying Liu,
  • Dong Jun Lee,
  • Taehun Jeong,
  • Byeonghun Oh,
  • Hongyu Shang,
  • Rong Yang,
  • Inseok Seo,
  • Du-Hyun Lim,
  • Jae-Kwang Kim,
  • Jou-Hyeon Ahn

摘要

The development of cathodes with high sulfur loading is essential for practical high-energy lithium–sulfur batteries. The binder functions as a polymeric framework that integrates active materials and conductive agents, while preserving electrode integrity and influencing electrochemical behavior. In lithium–sulfur systems, binders with polar functional groups that interact strongly with lithium polysulfides are crucial to suppress the shuttle effect and enhance cycling stability. Here, we design a multifunctional binder, poly(amic acid)–dextrin copolymer (PDB), which incorporates amide, carboxyl, hydroxyl, and imide groups within a three-dimensional network. This architecture provides mechanical robustness, immobilizes polysulfides, accelerates redox kinetics, and improves interfacial contact among electrode components. As a result, lithium–sulfur cells with PDB deliver a specific capacity of 590 mAh g− 1 after 100 cycles at 0.5 C, and maintain 357 mAh g− 1 under a high sulfur loading of 9.0 mg cm− 2 after 100 cycles at 0.2 C. This work demonstrates that multifunctional binder systems play a pivotal role in advancing lithium–sulfur batteries toward scalable, high-performance, and cost-effective energy storage technologies.