N-Doped Carbon Nanonecklaces with Encapsulated Sb as a Sodium-Ion Battery Anode
02 engineering and technology
0210 nano-technology
01 natural sciences
7. Clean energy
0104 chemical sciences
DOI:
10.1016/j.matt.2019.03.010
Publication Date:
2019-08-14T15:08:54Z
AUTHORS (6)
ABSTRACT
Summary The sodium-ion battery has shown great potential to replace the lithium-ion battery, especially for large-scale energy-storage systems. In this work, a hybrid material of ultra-small Sb nanoparticles encapsulated in unique N-doped carbon nanonecklace (Sb/N-CNN) has been synthesized for the first time via electrospinning and in situ substitution. As an anode material in sodium-ion batteries, the as-fabricated Sb/N-CNN exhibits superior rate property (314 mAh g−1 at 20 A g−1) and cycling stability (401 mAh g−1 after 6,000 cycles at 1 A g−1), outperforming other Sb-based materials. Such excellent performances originate from the ingenious necklace-like structure of Sb/N-CNN, which supplies efficient electrolyte diffusion paths and more active sites for Na+ insertion/extraction, disperses the stress caused by the large volume change of Sb nanoparticles during the cycling process, and also reduces the electrode resistance. This study provides a facile strategy for construction of a well-designed structure for advanced energy-storage technologies.
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