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Coaxial Hard Carbon‐coated Carbon Nanotubes as Anodes for Sodium‐ion Batteries

Von Wiley-VCH zur Verfügung gestellt

Coaxial hard carbon-coated carbon nanotubes were prepared. The embedded high conductive CNTs network is beneficial for high conductivity, while the moderate hard carbon coating layer can provide sufficient sodium-ion storage space with a short ion-transfer distance. The significantly improved sodium ion storage capability is achieved as compared to that for hard carbon spheres.


Abstract

Although being advantageous, the sodium-ion storage capability of hard carbon would be better if its electrical conductivity could be improved. Herein, 3D hard carbon-coated carbon nanotubes (CNTs@C) with interconnected conductive networks are fabricated by inducing hard carbon uniformly growth on CNTs. Compared with the isolated hard carbon spheres, the interconnected wire shape of CNTs@C reduces the ion transfer distance and increases the conductivity of hard carbon. By optimizing the thickness of the hard carbon layer and annealing temperature, the optimized CNTs@C displays a reversible specific capacity of 275.9 mAh g−1 at 0.1 A g−1 as anode material for SIBs. Furthermore, the material shows remarkable rate capability (102.8 mAh g−1 at 5 A g−1) and long-life cycling performance (∼100% capacity retention after 1000 cycles at 5 A g−1). The results of this study provide an effective route for designing novel carbon-based composite materials as anodes for SIBs.

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