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Two-dimensional graphitic carbon nitride (g-C3N4) nanosheet is a promising negative electrode candidate for sodium-ion batteries (NIBs) owing to its easy scalability, low cost, chemical stability and potentially high rate capability. However, intrinsic g-C3N4 exhibits poor electronic conductivity, low reversible Na-storage capacity and insufficient cyclability. Our density functional theory calculation suggests that this is due to a large Na+ ion diffusion barrier in the innate g-C3N4 nanosheet. Here we strategically apply a facile one-pot heating of a mixture of low-cost urea and asphalt to yield stacked multilayer C/g-C3N4 composites with improved Na-storage capacity (about 2 times higher than that of g-C3N4, up to 254 mAh/g), rate capability and cyclability. A C/g-C3N4 sodium-ion full cell (in which sodium rhodizonate dibasic is used as the positive electrode) demonstrates high Coulombic efficiency (~99.8%) and a negligible capacity fading over 14,000 cycles at 1 A/g. The design of the C/g-C3N4 negative electrode material offers effective strategies to develop low-cost and long-life NIBs.
This article was published in the following journal.
Name: Angewandte Chemie (International ed. in English)
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