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Pseudocapacitance-Boosted Ultrafast Na Storage in Pie-Like FeS@C Nanohybrid as Advanced Anode Material for Sodium-Ion Full Batteries

Abstract

In order to develop the promising anode materials for sodium-ion batteries (SIBs), a novel pie-like FeS@C (P-FeS@C) nanohybrid, in which all ultrasmall FeS nanocrystals (NCs) are totally embedded into the carbon network and sealed by a protective carbon shell, has been prepared. The unique pie-like structure can effectively speed up the kinetics of electrode reactions, while the carbon shell stabilizes the FeS NCs inside. The studies show that the electrochemical reaction processes of P-FeS@C electrodes are dominated by the pseudocapacitive behavior, leading to an ultrafast Na+-insertion/extraction reaction. Hence, the prepared P-FeS@C nanohybrid exhibits the superior Na-storage properties especially the high rate capability in the half cells. For example, it can deliver the reversible capacities of 555.1 mA h g-1 at 0.2 A g-1 over 150 cycles and about 60.4 mA h g-1 at 80 A g-1 (an ultrahigh current density even higher than that for the capacitor test). Furthermore, an advanced P-FeS@C//Na3V2(PO4)2O2F full cell has been assembled out, which delivers a stable specific capacity of 441.2 mA h g-1 after 80 cycles at 0.5 A g-1 with a capacity retention of 91.8%.

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Publication details

The article was received on 28 Dec 2017, accepted on 12 Apr 2018 and first published on 12 Apr 2018


Article type: Paper
DOI: 10.1039/C7NR09674G
Citation: Nanoscale, 2018, Accepted Manuscript
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    Pseudocapacitance-Boosted Ultrafast Na Storage in Pie-Like FeS@C Nanohybrid as Advanced Anode Material for Sodium-Ion Full Batteries

    B. Hou, Y. Wang, J. Guo, Q. Ning, X. Xi, W. Pang, A. Cao, X. Wang, J. Zhang and X. Wu, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C7NR09674G

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