期刊
ENERGY STORAGE MATERIALS
卷 24, 期 -, 页码 439-449出版社
ELSEVIER
DOI: 10.1016/j.ensm.2019.07.017
关键词
Fe7Se8; Sodium-ion batteries; Anode; N-doped carbon nanofibers; High-rate property
资金
- National Natural Science Foundation of China [51671092, 51631004]
- Program for JLU Science and Technology Innovative Research Team [2017TD-09]
- Graduate Innovation Fund of Jilin University [101832018C208, 101832018C001]
- Fundamental Research Funds for the Central Universities
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.
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