TY - JOUR
T1 - FeS 2 microspheres wrapped by N-doped rGO from an Fe-based ionic liquid precursor for rechargeable lithium ion batteries
AU - Ding, Xueda
AU - Du, Chengfeng
AU - Li, Jianrong
AU - Huang, Xiaoying
N1 - Publisher Copyright:
© 2019 The Royal Society of Chemistry.
PY - 2019
Y1 - 2019
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85061815562&partnerID=8YFLogxK
U2 - 10.1039/c8se00539g
DO - 10.1039/c8se00539g
M3 - 文章
AN - SCOPUS:85061815562
SN - 2398-4902
VL - 3
SP - 701
EP - 708
JO - Sustainable Energy and Fuels
JF - Sustainable Energy and Fuels
IS - 3
ER -