کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5432069 | 1508829 | 2017 | 12 صفحه PDF | دانلود رایگان |
A type of sandwich-type and mesoporous CoS-based coaxial nanocables with conductive CNT backbone core, well-confined CoS nanoparticle interlayer and conformal carbon coating shell (denoted as CNT@CoS@C) are developed through a bottom-up method and investigated as potential anode materials for sodium/lithium ion storage. The rationally constructed architecture successively achieves the integration of one-dimensional conducting networks, ultrafine active nanoparticles, well-developed mesoporosity and sophisticated surface modification via a layer-by-layer assembly strategy, thus upholding good structural/interfacial robustness and enhanced charge-transfer reaction kinetics. As a result, the CNT@CoS@C coaxial nanocables exhibit a high reversible capacity of 494 mAh gâ1, stable cycling with more than 318 mAh gâ1 at 500 mA gâ1 over 500 cycles (corresponding to 74% capacity retention with 0.05% decay rate per cycle) and impressive rate capability (278 mAh gâ1 at 5000 mA gâ1) for sodium ion batteries (SIBs) and excellent electrochemical performance for lithium ion batteries (LIBs) (1010 mAh gâ1 during 200 cycles with no capacity loss and 467 mAh gâ1 at 5000 mA gâ1). In addition, the electrochemical experimental results and simulated calculations suggest that the CoS-based active species possesses better electrochemical properties in term of reaction reversibility and structural stability than its Co3O4-based counterpart with similar morphological features.
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Journal: Carbon - Volume 118, July 2017, Pages 731-742