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Preparation of ternary hierarchical silicon/reduced graphene oxide/carbon composites as anodes for lithium–ion batteries

Silicon/reduced graphene oxide/carbon (Si/rGO/C) composite material prepared with a carboxyl methyl cellulose and styrene butadiene rubber (CMC + SBR) hybrid binder is successfully synthesized, characterized, and evaluated as a composite anode for lithium–ion batteries (LIBs). The porous Si/rGO/C co...

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Published in:Journal of alloys and compounds 2019-07, Vol.793, p.433-445
Main Authors: Wu, Yi–Shiuan, Yang, Chun–Chen, Wu, She–Huang, Wu, Zong–Han, Wei, Chao−Nan, Yang, Min–Yen, Lue, Shingjiang Jessie
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container_title Journal of alloys and compounds
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description Silicon/reduced graphene oxide/carbon (Si/rGO/C) composite material prepared with a carboxyl methyl cellulose and styrene butadiene rubber (CMC + SBR) hybrid binder is successfully synthesized, characterized, and evaluated as a composite anode for lithium–ion batteries (LIBs). The porous Si/rGO/C composite microspheres with interior meso–pores are obtained by encapsulating Si–based nanoparticles into the rGO/C dual–carbon matrix via self–assembling, ball milling, polystyrene sphere (PSS) template–assisting, and spray drying techniques, which facilitate a fast electron and Li+ ion transport, and mitigate Si pulverization. Compared with bare copper (Cu) foil, as–prepared Si/rGO/C composite electrode based on a carbon–coated Cu (C–Cu) foil assembled with a polyethylene (PE) separator exhibits better rate capability, in particular, at high rates, and a capacity increases to ca. 6–10%. By cycling at 400 mA g−1 for 500 cycles, the Si/rGO/C/C–Cu composite electrode with a capacity retention (CR%) of ∼75% and Coulombic efficiency (CE%) of ∼99.7% retains a higher specific capacity of ∼602 mAh g−1 than that on bare Cu foil (∼314 mAh g−1), which is comparable to those reported in the literature. The synergistic effect of the hierarchical composite anode material together with highly adhesive and electrolyte−hydrophilic C–Cu foil results in much better electrochemical performance as a promising LIB anode. [Display omitted] •Si/rGO/C composite with a CMC + SBR hybrid binder is synthesized as a LIB anode.•The microspheres with interior meso–pores facilitate fast e– and Li+ transports.•The Si/rGO/C composite coated on C–Cu foil exhibits a better C–rate capability.•The Si/rGO/C/C–Cu electrode retains a CR% of ∼75% at 400 mA g−1 for 500 cycles.
doi_str_mv 10.1016/j.jallcom.2019.04.168
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The porous Si/rGO/C composite microspheres with interior meso–pores are obtained by encapsulating Si–based nanoparticles into the rGO/C dual–carbon matrix via self–assembling, ball milling, polystyrene sphere (PSS) template–assisting, and spray drying techniques, which facilitate a fast electron and Li+ ion transport, and mitigate Si pulverization. Compared with bare copper (Cu) foil, as–prepared Si/rGO/C composite electrode based on a carbon–coated Cu (C–Cu) foil assembled with a polyethylene (PE) separator exhibits better rate capability, in particular, at high rates, and a capacity increases to ca. 6–10%. By cycling at 400 mA g−1 for 500 cycles, the Si/rGO/C/C–Cu composite electrode with a capacity retention (CR%) of ∼75% and Coulombic efficiency (CE%) of ∼99.7% retains a higher specific capacity of ∼602 mAh g−1 than that on bare Cu foil (∼314 mAh g−1), which is comparable to those reported in the literature. The synergistic effect of the hierarchical composite anode material together with highly adhesive and electrolyte−hydrophilic C–Cu foil results in much better electrochemical performance as a promising LIB anode. 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The synergistic effect of the hierarchical composite anode material together with highly adhesive and electrolyte−hydrophilic C–Cu foil results in much better electrochemical performance as a promising LIB anode. 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The porous Si/rGO/C composite microspheres with interior meso–pores are obtained by encapsulating Si–based nanoparticles into the rGO/C dual–carbon matrix via self–assembling, ball milling, polystyrene sphere (PSS) template–assisting, and spray drying techniques, which facilitate a fast electron and Li+ ion transport, and mitigate Si pulverization. Compared with bare copper (Cu) foil, as–prepared Si/rGO/C composite electrode based on a carbon–coated Cu (C–Cu) foil assembled with a polyethylene (PE) separator exhibits better rate capability, in particular, at high rates, and a capacity increases to ca. 6–10%. By cycling at 400 mA g−1 for 500 cycles, the Si/rGO/C/C–Cu composite electrode with a capacity retention (CR%) of ∼75% and Coulombic efficiency (CE%) of ∼99.7% retains a higher specific capacity of ∼602 mAh g−1 than that on bare Cu foil (∼314 mAh g−1), which is comparable to those reported in the literature. The synergistic effect of the hierarchical composite anode material together with highly adhesive and electrolyte−hydrophilic C–Cu foil results in much better electrochemical performance as a promising LIB anode. [Display omitted] •Si/rGO/C composite with a CMC + SBR hybrid binder is synthesized as a LIB anode.•The microspheres with interior meso–pores facilitate fast e– and Li+ transports.•The Si/rGO/C composite coated on C–Cu foil exhibits a better C–rate capability.•The Si/rGO/C/C–Cu electrode retains a CR% of ∼75% at 400 mA g−1 for 500 cycles.</abstract><cop>Lausanne</cop><pub>Elsevier B.V</pub><doi>10.1016/j.jallcom.2019.04.168</doi><tpages>13</tpages></addata></record>
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subjects Adhesives
Anode effect
Ball milling
Batteries
Butadiene
Carbon
Carbon–coated copper foil
Carboxymethyl cellulose
Coated electrodes
Composite materials
Copper
Dual–carbon matrix
Electrochemical analysis
Electrode materials
Graphene
Ion transport
Lithium ions
Lithium–ion batteries
Metal foils
Microspheres
Nanoparticles
Polyethylenes
Polymer matrix composites
Polystyrene resins
Polystyrene sphere template–assisting
Rubber
Separators
Silicon
Spray drying
Synergistic effect
title Preparation of ternary hierarchical silicon/reduced graphene oxide/carbon composites as anodes for lithium–ion batteries
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