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<p>Layered oxides and Prussian blue analogues are promising but flawed cathode materials for sodium-ion batteries (SIBs), plagued by their intrinsic limitations involving structural instability and coordinated water/lattice defects, respectively. Herein, we fabricated a composite material via surface modification-assisted hybridization of layered oxide Na₂<sub>/</sub>₃Ni₁<sub>/</sub>₃Mn₂<sub>/</sub>₃O₂ (NNM) and an iron-based Prussian blue analogue Na<sub>2</sub>Fe[Fe(CN)<sub>6</sub>] (NFF) nanocubes. The optimized NNM/NFF73 composite (7:3 in mass ratio) exhibits a mutually stabilized architecture, where the layered NNM framework suppresses NFF agglomeration and dissolution, while the open NFF structure enables rapid Na⁺ migration. This synergy endows the material with exceptional high-rate capability (34.6 mAh g⁻¹ at 20&#xa0;C) and outstanding cycling durability (74.8% capacity retention after 500 cycles at 0.5&#xa0;C). Our work offers a rational composite strategy toward high-performance, cost-effective sodium-ion battery cathodes.</p>

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Synergistic layered oxide/Prussian blue composite enabling ultrahigh-rate and long-life sodium-ion batteries

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Jinwen Tan,
  • Jun Wu,
  • Yurong Cai,
  • Wenbin Ni,
  • Xiaochong Zhou,
  • Lihuan Shao

摘要

Layered oxides and Prussian blue analogues are promising but flawed cathode materials for sodium-ion batteries (SIBs), plagued by their intrinsic limitations involving structural instability and coordinated water/lattice defects, respectively. Herein, we fabricated a composite material via surface modification-assisted hybridization of layered oxide Na₂/₃Ni₁/₃Mn₂/₃O₂ (NNM) and an iron-based Prussian blue analogue Na2Fe[Fe(CN)6] (NFF) nanocubes. The optimized NNM/NFF73 composite (7:3 in mass ratio) exhibits a mutually stabilized architecture, where the layered NNM framework suppresses NFF agglomeration and dissolution, while the open NFF structure enables rapid Na⁺ migration. This synergy endows the material with exceptional high-rate capability (34.6 mAh g⁻¹ at 20 C) and outstanding cycling durability (74.8% capacity retention after 500 cycles at 0.5 C). Our work offers a rational composite strategy toward high-performance, cost-effective sodium-ion battery cathodes.