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<p>Binders are essential for preserving electrode integrity throughout repeated cycling. Constructing a cross-linked network is a proven strategy to enhance binding affinity. In this work, we propose a novel binding strengthening strategy which exploits the strong interaction between Cu<sub>3</sub>P and sodium alginate (SA). A unique cross-linked structure after sodiation of Cu<sub>3</sub>P was in-situ formed, reinforcing electrode integrity and mitigates volume expansion. Consequently, the Cu<sub>3</sub>P/SA composite delivers a high reversible capacity of 207&#xa0;mAh&#xa0;g<sup>−1</sup> after 50 cycles at 0.2&#xa0;A&#xa0;g<sup>−1</sup>. Notably, the electrode maintains considerable stability even when the Cu<sub>3</sub>P loading is increased to ~ 5&#xa0;mg&#xa0;cm<sup>−2</sup>. This work presents a facile approach to achieving high-performance conversion anode materials for sodium-ion batteries.</p> Graphical abstract <p></p>

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Self-cross-linking binder triggered by anode interface for robust sodium-ion batteries

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Wu Zhang,
  • Juncheng Wang,
  • Fating Wang,
  • Jingjing Guo,
  • Yuanlong Liu,
  • Hongtao Cui,
  • Sihua Jiang,
  • Min Hong,
  • Fei Lv,
  • Tiefeng Liu

摘要

Binders are essential for preserving electrode integrity throughout repeated cycling. Constructing a cross-linked network is a proven strategy to enhance binding affinity. In this work, we propose a novel binding strengthening strategy which exploits the strong interaction between Cu3P and sodium alginate (SA). A unique cross-linked structure after sodiation of Cu3P was in-situ formed, reinforcing electrode integrity and mitigates volume expansion. Consequently, the Cu3P/SA composite delivers a high reversible capacity of 207 mAh g−1 after 50 cycles at 0.2 A g−1. Notably, the electrode maintains considerable stability even when the Cu3P loading is increased to ~ 5 mg cm−2. This work presents a facile approach to achieving high-performance conversion anode materials for sodium-ion batteries.

Graphical abstract