FeS 2 microspheres wrapped by N-doped rGO from an Fe-based ionic liquid precursor for rechargeable lithium ion batteries

Xueda Ding, Chengfeng Du, Jianrong Li, Xiaoying Huang

科研成果: 期刊稿件文章同行评审

23 引用 (Scopus)

摘要

Earth-abundant pyrite (FeS 2 ) 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 FeS 2 usually suffer from volume expansion, dissolution of polysulfides, and low conductivity of Li 2 S. Herein, FeS 2 /N-doped reduced graphene oxide microspheres (FeS 2 /N-rGO) are first synthesized from an Fe-based ionic liquid, [C 12 MMim]FeCl 4 (C 12 MMim = 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 FeS 2 /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.

源语言英语
页(从-至)701-708
页数8
期刊Sustainable Energy and Fuels
3
3
DOI
出版状态已出版 - 2019

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