FeSe2 clusters with excellent cyclability and rate capability for sodium-ion batteries
- 330 Downloads
Sodium-ion batteries (SIBs) have great promise for sustainable and economical energy-storage applications. Nevertheless, it is a major challenge to develop anode materials with high capacity, high rate capability, and excellent cycling stability for them. In this study, FeSe2 clusters consisting of nanorods were synthesized by a facile hydrothermal method, and their sodium-storage properties were investigated with different electrolytes. The FeSe2 clusters delivered high electrochemical performance with an ether-based electrolyte in a voltage range of 0.5–2.9 V. A high discharge capacity of 515 mAh·g–1 was obtained after 400 cycles at 1 A·g–1, with a high initial columbic efficiency of 97.4%. Even at an ultrahigh rate of 35 A·g–1, a specific capacity of 128 mAh·g–1 was achieved. Using calculations, we revealed that the pseudocapacitance significantly contributed to the sodium-ion storage, especially at high current rates, leading to a high rate capability. The high comprehensive performance of the FeSe2 clusters makes them a promising anode material for SIBs.
KeywordsFeSe2 clusters superior rate capability excellent cycling stability sodium-ion batteries pseudocapacitive behavior
Unable to display preview. Download preview PDF.
This work was supported by the National Key Research and Development Program of China (No. 2016YFA0202603), the National Natural Science Foundation of China (Nos. 51425204 and 51602239), the Hubei Provincial Natural Science Foundation of China (No. 2016CFB267), the Fundamental Research Funds for the Central Universities (Nos. 2016IVA090 and 2017III005), the Natural Science Foundation of Henan Province (Nos. 152300410114 and 14B140009), the China Postdoctoral Science Foundation (No. 2016M592401). L. Q. M. gratefully acknowledged financial support from China Scholarship Council (No. 201606955096).
- Dong, Y. F.; Li, S.; Zhao, K. N.; Han, C. H.; Chen, W.; Wang, B. L.; Wang, L.; Xu, B. A.; Wei, Q. L.; Zhang, L. et al. Hierarchical zigzag Na1.25V3O8 nanowires with topotactically encoded superior performance for sodium-ion battery cathodes. Energy Environ. Sci. 2015, 8, 1267–1275.CrossRefGoogle Scholar
- Wei, X. J.; Tang, C. J.; Wang, X. P.; Zhou, L.; Wei, Q. L.; Yan, M. Y.; Sheng, J. Z.; Hu, P.; Wang, B. L.; Mai, L. Q. Copper silicate hydrate hollow spheres constructed by nanotubes encapsulated in reduced graphene oxide as longlife lithium-ion battery anode. ACS Appl. Mater. Interfaces 2015, 7, 26572–26578.CrossRefGoogle Scholar
- Wei, Q. L.; An, Q. Y.; Chen, D. D.; Mai, L. Q.; Chen, S. Y.; Zhao, Y. L.; Hercule, K. M.; Xu, L.; Khan, A. M.; Zhang, Q. J. One-pot synthesized bicontinuous hierarchical Li3V2(PO4)3/C mesoporous nanowires for high-rate and ultralong-life lithium-ion batteries. Nano Lett. 2014, 14, 1042–1048.CrossRefGoogle Scholar