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Issue 16, 2018
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Enhanced pseudocapacitance contribution to outstanding Li-storage performance for a reduced graphene oxide-wrapped FeS composite anode

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Abstract

To meet heavy-duty applications for LIBs, development of superior electrode materials with high-efficiency lithium-storage capability has become very crucial and urgent. Herein, a simple one-pot method has been developed for the synthesis of a reduced graphene oxide-wrapped FeS nanoflake (FeS@rGO) composite using oleylamine as a solvent, reductant, and surfactant. The as-prepared FeS@rGO composite as an anode material for LIBs showed excellent cycling ability and rate performance, i.e., reversible capacities of 887 mA h g−1 at the current density of 200 mA g−1 after 150 cycles, 662 mA h g−1 at 1.0 A g−1 after 200 cycles, and 325 mA h g−1 at 5.0 A g−1 even after 1000 cycles. These enhanced electrochemical performances can be attributed to the unique cladding structure, in which rGO can act as a protective coating to accommodate volume changes of FeS upon Li-cycling and offer a fast electron transfer channel. A two-dimensional sheet structure also facilitates Li+ ion diffusion in active electrode materials. More importantly, the enhanced extrinsic pseudocapacitance can promote the charge transfer rate and afford significant Li-storage capacity, thereby promoting the rate capability of a material at large current densities. Therefore, as a promising anode with high power density and long lifespan, this composite has shown its distinct potential and advantage for heavy-duty LIBs.

Graphical abstract: Enhanced pseudocapacitance contribution to outstanding Li-storage performance for a reduced graphene oxide-wrapped FeS composite anode

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Publication details

The article was received on 23 Jan 2018, accepted on 19 Mar 2018 and first published on 20 Mar 2018


Article type: Paper
DOI: 10.1039/C8TA00740C
Citation: J. Mater. Chem. A, 2018,6, 7155-7161
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    Enhanced pseudocapacitance contribution to outstanding Li-storage performance for a reduced graphene oxide-wrapped FeS composite anode

    M. Huang, A. Xu, H. Duan and S. Wu, J. Mater. Chem. A, 2018, 6, 7155
    DOI: 10.1039/C8TA00740C

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