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Na⁺ intercalation pseudocapacitance in graphene-coupled titanium oxide enabling ultra-fast sodium storage and long-term cycling

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https://ir.library.oregonstate.edu/concern/articles/fj2363897

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  • Sodium-ion batteries are emerging as a highly promising technology for large-scale energy storage applications. However, it remains a significant challenge to develop an anode with superior long-term cycling stability and high-rate capability. Here we demonstrate that the Na⁺ intercalation pseudocapacitance in TiO₂/graphene nanocomposites enables high-rate capability and long cycle life in a sodium-ion battery. This hybrid electrode exhibits a specific capacity of above 90mAh g⁻¹ at 12,000mAg⁻¹ (≈36 C). The capacity is highly reversible for more than 4,000 cycles, the longest demonstrated cyclability to date. First-principle calculations demonstrate that the intimate integration of graphene with TiO₂ reduces the diffusion energy barrier, thus enhancing the Na⁺ intercalation pseudocapacitive process. The Na-ion intercalation pseudocapacitance enabled by tailor-deigned nanostructures represents a promising strategy for developing electrode materials with high power density and long cycle life.
  • This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by Nature Publishing Group. The published article can be found at: http://www.nature.com/ncomms/2015/150424/ncomms7929/full/ncomms7929.html
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  • Chen, C., Wen, Y., Hu, X., Ji, X., Yan, M., Mai, L., ... & Huang, Y. (2015). Na+ intercalation pseudocapacitance in graphene-coupled titanium oxide enabling ultra-fast sodium storage and long-term cycling. Nature communications, 6:6929. doi:10.1038/ncomms7929
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  • 6
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  • This work was supported by Natural Science Foundation of China (no. 21271078 and 51472098), Program for New Century Excellent Talents in University (no. NECT-12-0223), and Program for Changjiang Scholars and Innovative Research Team in University (no. IRT1014).
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