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<p>Sodium-ion batteries (SIBs) demonstrate broad application prospects in large-scale energy storage due to advantages such as abundant sodium resources and low cost. However, their development is constrained by the lack of high-performance anode materials. Metal-organic framework (MOF)-derived materials, with their controllable morphology, high specific surface area, and tunable chemical composition, have emerged as ideal precursors for preparing advanced battery electrode materials. In this study, a Ni-Co bimetallic phosphide nanoparticle-decorated hollow carbon sphere (Ni-Co/P@HCS) composite was successfully synthesized using a Ni-Co bimetallic MOF as a template via a high-temperature carbonization and phosphorization strategy. This composite was employed as an anode material for SIBs. Results revealed uniform dispersion of Ni-Co/P nanoparticles on the hollow carbon sphere surface, forming a unique core-shell structure. Electrochemical testing revealed that this composite exhibits favorable electrochemical performance during sodium-ion storage: At a current density of 250 mAh g⁻¹, the material achieved a capacity of 309.9 mAh g⁻¹ after 200 cycles. Even after 3000 cycles at a high current density of 2.5&#xa0;A g⁻¹, it retained a capacity of 144.7 mAh g⁻¹. This is attributed to the synergistic interaction between Ni-Co bimetallic phosphides and hollow carbon spheres: the bimetallic phosphides provide high theoretical specific capacity and abundant active sites, while the hollow carbon spheres effectively mitigate volume expansion, enhance electron conductivity, and suppress agglomeration of active particles. This study offers novel insights and strategies for designing and fabricating high-performance SIBs anode materials.</p>

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Construction and mechanism study of sodium-ion battery anode materials based on the synergistic effect of NiCo-MOF-derived heterostructures and hollow carbon spheres

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Kaifeng Yu,
  • Zaichun Jiang,
  • Hui Ao,
  • Yi Li,
  • Shuang Gao

摘要

Sodium-ion batteries (SIBs) demonstrate broad application prospects in large-scale energy storage due to advantages such as abundant sodium resources and low cost. However, their development is constrained by the lack of high-performance anode materials. Metal-organic framework (MOF)-derived materials, with their controllable morphology, high specific surface area, and tunable chemical composition, have emerged as ideal precursors for preparing advanced battery electrode materials. In this study, a Ni-Co bimetallic phosphide nanoparticle-decorated hollow carbon sphere (Ni-Co/P@HCS) composite was successfully synthesized using a Ni-Co bimetallic MOF as a template via a high-temperature carbonization and phosphorization strategy. This composite was employed as an anode material for SIBs. Results revealed uniform dispersion of Ni-Co/P nanoparticles on the hollow carbon sphere surface, forming a unique core-shell structure. Electrochemical testing revealed that this composite exhibits favorable electrochemical performance during sodium-ion storage: At a current density of 250 mAh g⁻¹, the material achieved a capacity of 309.9 mAh g⁻¹ after 200 cycles. Even after 3000 cycles at a high current density of 2.5 A g⁻¹, it retained a capacity of 144.7 mAh g⁻¹. This is attributed to the synergistic interaction between Ni-Co bimetallic phosphides and hollow carbon spheres: the bimetallic phosphides provide high theoretical specific capacity and abundant active sites, while the hollow carbon spheres effectively mitigate volume expansion, enhance electron conductivity, and suppress agglomeration of active particles. This study offers novel insights and strategies for designing and fabricating high-performance SIBs anode materials.