Fe7Se8 nanoparticles anchored on N-doped carbon nanofibers as high-rate anode for sodium-ion batteries

By Dong Zhang, Jianmei Jia, C. Yang, Q. Jiang. 2020

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Abstract On account of increasing demand for large-scale energy storage devices, sodium-ion batteries have shown great potential to replace lithium-ion batteries owing to the abundant reserve, low cost and environmental benignity of sodium resources. Here, we report a facile electrospinning method to fabricate a hybrid material of ultrasmall Fe7Se8 nanoparticles/N-doped carbon nanofibers (Fe7Se8/N-CNFs). As an anode material in sodium-ion batteries, the Fe7Se8/N–CNF hybrid exhibits superior rate property with a specific capacity of 286.3 mAh g−1 at a current density of 20 A g−1, outperforming other metal selenides. Such an excellent performance originates from the synergistic effects of ultrasmall Fe7Se8 nanoparticles as well as the unique and interconnected network of N-rich CNFs, which offer short Na+ diffusion distance, provide efficient electrolyte diffusion paths, supply numerous defects and active sites for Na+ adsorption, enhance surface pseudocapacitive behavior, improve the electronic conductivity, and thus facilitate the electron/ion transport and electrochemical reaction kinetics.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/0b637acc37ff903e74816e6b25501237803224bd