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<p>Aqueous zinc-based batteries (ZBBs) are promising for grid-scale energy storage owing to their safety and cost-effectiveness; however, their practical application is hindered by rapid capacity fading and unstable cathodes caused by sluggish Zn<sup>2+</sup> kinetics and structural degradation in alkaline electrolytes. Herein, to address these challenges, we utilize amphiphilic polymer (PVP) to realize the composite of nickel-based complexes and ZIF-67. The hierarchical nickel–cobalt layered double hydroxide (NiCo-LDH) was prepared by metal ion exchange strategy. PVP-mediated-mediated suppression of agglomeration, combined with Ni<sup>2+</sup>-induced framework reconstruction, synergistically modulated the morphology, resulting in mesoporous nanosheets with hydroxyl-rich surfaces. This design generated high-valence Co<sup>3+</sup> species through charge-compensation-driven oxidation, thereby significantly accelerating Zn<sup>2+</sup> ion diffusion and reducing the interfacial resistance. The optimized NiCo-LDH-100 cathode (Ni:Co = 3:1) achieves cycling stability and exceptional energy/power densities (0.49&#xa0;mWh&#xa0;cm<sup>–2</sup>/49.1&#xa0;mW&#xa0;cm<sup>–2</sup>). This study provides a solution for the cathode instability of Ni-Zn batteries through a coordination-derivatization strategy, which is promising for advancing sustainable energy storage technologies.</p> Graphical Abstract <p></p>

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Coordination-etching fabrication of ZIF-67-derived nickel–cobalt layered double hydroxides for aqueous Ni-Zn batteries

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Ling-Ling Chen,
  • Dian-Heng Yu,
  • Yi-Hao Chen,
  • Hsiao-Chien Chen,
  • Mohsen Shakouri,
  • Yi-Chun Su,
  • Huan Pang

摘要

Aqueous zinc-based batteries (ZBBs) are promising for grid-scale energy storage owing to their safety and cost-effectiveness; however, their practical application is hindered by rapid capacity fading and unstable cathodes caused by sluggish Zn2+ kinetics and structural degradation in alkaline electrolytes. Herein, to address these challenges, we utilize amphiphilic polymer (PVP) to realize the composite of nickel-based complexes and ZIF-67. The hierarchical nickel–cobalt layered double hydroxide (NiCo-LDH) was prepared by metal ion exchange strategy. PVP-mediated-mediated suppression of agglomeration, combined with Ni2+-induced framework reconstruction, synergistically modulated the morphology, resulting in mesoporous nanosheets with hydroxyl-rich surfaces. This design generated high-valence Co3+ species through charge-compensation-driven oxidation, thereby significantly accelerating Zn2+ ion diffusion and reducing the interfacial resistance. The optimized NiCo-LDH-100 cathode (Ni:Co = 3:1) achieves cycling stability and exceptional energy/power densities (0.49 mWh cm–2/49.1 mW cm–2). This study provides a solution for the cathode instability of Ni-Zn batteries through a coordination-derivatization strategy, which is promising for advancing sustainable energy storage technologies.

Graphical Abstract