Journal
RSC ADVANCES
Volume 5, Issue 51, Pages 41210-41217Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra03658e
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Funding
- National Natural Science Foundation of China [51072013, 51272021, 51102009]
- Natural Science Foundation of Jiangsu Province [BK20131147]
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Amorphous Cu-added tin oxides/carbon nanofiber (Cu-added SnOx/CNFs) composite webs used for lithium-ion battery anode materials are prepared by an electrospinning technique and subsequent thermal treatment. The Cu-doped SnOx particles are uniformly distributed in the CNFs and maintain the original morphology after long-term cycling. In a controlled experiment, SnOx-20%Cu/CNFs with an atomic ratio of Cu : Sn = 0.2 shows the highest electrochemical performance with a high reversible capacity of 743 mA h g(-1) at a current density of 200 mA g(-1) and an excellent rate capacity of 347 mA h g(-1) at 5 A g(-1). Moreover, the composite electrode exhibits an outstanding long-term cycling performance at 2 A g(-1) even after 1000 cycles. The superior reversible lithium-ion storage capability is attributed to the uniform dispersion of the Cu2O and ultrafine SnOx particles in CNFs as well as the Cu-addition effects such as promoting electron transport and Li+ diffusion, preventing Sn from aggregation during cycling, and improving the reversibility of Sn back to SnOx in the recharge process.
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