Issue 3, 2019

FeS2 microspheres wrapped by N-doped rGO from an Fe-based ionic liquid precursor for rechargeable lithium ion batteries

Abstract

Earth-abundant pyrite (FeS2) is a promising anode material for lithium ion batteries (LIBs) because of its high theoretical specific capacity (894 mA h g−1). However, LIBs using pristine FeS2 usually suffer from volume expansion, dissolution of polysulfides, and low conductivity of Li2S. Herein, FeS2/N-doped reduced graphene oxide microspheres (FeS2/N-rGO) are first synthesized from an Fe-based ionic liquid, [C12MMim]FeCl4 (C12MMim = 1-dodecyl-2,3-dimethylimidazolium), which can not only be used as the metal and nitrogen source but also as an assembly medium and surfactant. As the anode material for rechargeable LIBs, the as-obtained FeS2/N-rGO composites display a specific capacity of 950 mA h g−1 after 140 cycles at a current density of 150 mA g−1 and deliver an average reversible discharge capacity of 973, 867, 778, and 671 mA h g−1 at 0.2, 0.5, 1.0, and 2.0 A g−1, respectively. Even at high current density, the specific capacity can still reach 510 mA h g−1. More importantly, after deep cycling, a high reversible capacity of 973 mA h g−1 can still be recovered when the current density reduced to 0.2 A g−1. This excellent stability and outstanding rate performance are mainly attributed to the suppression of dissolution of polysulfide intermediates and volume expansion by the conductive N-doped rGO matrix.

Graphical abstract: FeS2 microspheres wrapped by N-doped rGO from an Fe-based ionic liquid precursor for rechargeable lithium ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
02 Nov. 2018
Accepted
21 Nov. 2018
First published
21 Nov. 2018

Sustainable Energy Fuels, 2019,3, 701-708

FeS2 microspheres wrapped by N-doped rGO from an Fe-based ionic liquid precursor for rechargeable lithium ion batteries

X. Ding, C. Du, J. Li and X. Huang, Sustainable Energy Fuels, 2019, 3, 701 DOI: 10.1039/C8SE00539G

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