Flower-like Fe-doped $\mathrm{NiSe}_{2} / \mathrm{C}$ hybrid spheres fabricated by a glucose-intercalation strategy for enhanced sodium storage properties

Abstract

Nickel diselenide (NiSe₂), which has a high theoretical capacity, has attracted considerable attention as a promising anode material for sodium-ion batteries (SIBs). Nevertheless, the intrinsically low conductivity, large volume variation, and significant aggregation of NiSe₂ during sodiation/desodiation remain significant obstacles to its application. Herein, we report flower-like Fe-doped NiSe₂/C hybrid spheres (denoted as Fe-NiSe₂/C) fabricated by a glucose intercalation strategy for efficient sodium storage. These Fe-NiSe₂/C hybrid spheres are composed of thin porous carbon nanosheets decorated with Fe-NiSe₂ nanoparticles. In situ introduced carbon nanosheets derived from intercalated glucose accompanied by moderate Fe doping in NiSe₂ nanoparticles can provide accelerated ion/electron transfer kinetics through fast ion channels in the flower-like architecture and intimately contacted interfaces between NiSe₂ and carbon nanosheets as well as maintain structural integrity by alleviating volume variation. Consequently, the optimal anode of the Fe-NiSe₂/C hybrid spheres delivered a high discharge capacity of 415 mAh g⁻¹ at 0.5 A g⁻¹, outstanding rate capability (243 mAh g⁻¹ at 5 A g⁻¹), and significantly enhanced cycling stability (388 mAh g⁻¹ at 1 A g⁻¹ over 200 cycles). This work offers an efficient and valuable strategy for realizing tailored heteroatom doping in transition metal selenides, accompanied by an in situ combination of conductive carbonaceous networks for advanced alkali metal ion batteries.

Keywords

Glucose-intercalation / Fe-doped $\mathrm{NiSe}_{2}$ / Carbon nanosheets / Sodium-ion batteries

Declaration of Competing Interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

CRediT authorship contribution statement

Cheng Liu: Conceptualization, Investigation, Validation, Writing original draft. Yi Wen: Formal analysis, Investigation. Gaoya Ren: Data curation, Formal analysis, Investigation. Yaxuan Li: Data curation, Investigation, Validation. Qianqian Sun: Data curation, Formal analysis. Shenghui Shen: Resources, Visualization. Zhujun Yao: Funding acquisition, Validation. Yefeng Yang: Conceptualization, Funding acquisition, Resources, Supervision, Writing - review & editing.

Acknowledgements

The authors are grateful for the financial support provided by the Zhejiang Provincial Natural Science Foundation of China (Grant No. LY21E020010), National Natural Science Foundation of China (Grant No. 52102315), Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering (2021SZ-TD006), and Science and Technology Program of Zhejiang University Institute of Wenzhou (Grant No. XMGL-KJZX-202206).

Supplementary materials

Supplementary material associated with this article can be found, in the online version, at doi:10.1016/j.chphma.2024.01.004.

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