Disordered 3 D Multi-layer Graphene Anode Material from CO2for Sodium-Ion Batteries

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Department of Materials Science and Engineering


We report the application of disordered 3 D multi-layer graphene, synthesized directly from CO2gas through a reaction with Li at 550 °C, as an anode for Na-ion batteries (SIBs) toward a sustainable and greener future. The material exhibited a reversible capacity of ∼190 mA h g−1with a Coulombic efficiency of 98.5 % at a current density of 15 mA g−1. The discharge capacity at higher potentials ( > 0.2 V vs. Na/Na+) is ascribed to Na-ion adsorption at defect sites, whereas the capacity at low potentials ( < 0.2 V) is ascribed to intercalation between graphene sheets through electrochemical characterization, Raman spectroscopy, and small-angle X-ray scattering experiments. The disordered multi-layer graphene electrode demonstrated a great rate capability and cyclability. This novel approach to synthesize disordered 3 D multi-layer graphene from CO2gas makes it attractive not only as an anode material for SIBs but also to mitigate CO2emission.

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© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Publisher’s version of record: https://doi.org/10.1002/cssc.201600117

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