| Summary: | Two-dimensional (2D) graphitic carbon nitride (g-CN) is a promising anode material for sodium-ion batteries (SIBs), but its insufficient interlayer spacing and poor electronic conductivity impede its sodium storage capacity and cycling stability. Herein, we report the fabrication of a fullerene (C60)-modified graphitic carbon nitride (C60@CN) material which as an anode material for SIBs shows a high-reversible capacity (430.5 mA h g−1 at 0.05 A g−1, about 3 times higher than that of pristine g-CN), excellent rate capability (226.6 mA h g−1 at 1 A g−1) and ultra-long cycle life (101.2 mA h g−1 after 5000 cycles at 5 A g−1). Even at a high-active mass loading of 3.7 mg cm−2, a reversible capacity of 316.3 mA h g−1 can be obtained after 100 cycles. Such outstanding performance of C60@CN is attributed to the C60 molecules distributed in the g-CN nanosheets, which enhance the electronic conductivity and prevent g-CN sheets from restacking, thus resulting in enlarged interlayer spacing and exposed edge N defects (pyridinic N and pyrrolic N) for sodium-ion storage. Furthermore, a sodium-ion full cell combining C60@CN anode and NVPF@rGO cathode provides high-coulombic efficiency (>96.5%), exceptionally high-energy density (359.8 W h kganode−1 at power density of 105.1 W kganode−1) and excellent cycling stability (89.2% capacity retention over 500 cycles at 1 A ganode−1). This work brings new insights into the field of carbon-based anode materials for SIBs. © 2021 Zhengzhou University.
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