3 years ago

Intertwined Nitrogen-Doped Carbon Nanotubes for High-Rate and Long-Life Sodium-Ion Battery Anodes

Intertwined Nitrogen-Doped Carbon Nanotubes for High-Rate and Long-Life Sodium-Ion Battery Anodes
Biao Gao, Qiuyun Yuan, Weili An, Xuming Zhang, Kang Ding, Jijiang Fu, Paul K. Chu, Xingxing Li, Kaifu Huo, Hao Song
Intertwined nitrogen-doped carbon nanotubes (N-CNTs) are prepared by using a hard-template method with V2O5 nanowires as the hard template and dopamine as the carbon and nitrogen source, and the N-CNTs are characterized in details. As anodes in sodium-ion batteries (SIBs), the N-CNTs deliver a capacity of 179.1 mAh g−1 at 0.2 A g−1, and a capacity of 91.7 mAh g−1 is maintained even at 10 A g−1. After cycling for 1000 cycles at 1 and 5 A g−1, the capacity of the N-CNTs is retained at 125.5 and 104.2 mAh g−1, respectively. The excellent electrochemical performance in terms of rate capability and lifespan of the N-CNTs can be attributed to the synergistic effects of the intertwined one-dimensional hollow structure with hierarchical pores, extrinsic nitrogen content, and large interlayer distance of the graphene sheets. Fast and stable: Dopamine-derived intertwined nitrogen-doped carbon nanotubes (N-CNTs) are synthesized by using a hard-template method and tested as anodes in sodium-ion batteries. Thanks to the in situ nitrogen doping and 1D ultrathin nanotubes assembling into a 3D network with a hierarchical pore structure, the N-CNTs exhibit excellent rate capability and cycling stability even after 1000 cycles.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/celc.201700590

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