Journal
JOURNAL OF POWER SOURCES
Volume 316, Issue -, Pages 132-138Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.03.050
Keywords
Reduced graphene oxide/carbon nanotubes sponge; Sodium-ion batteries; High capacity; Long life cycling
Funding
- Basic Research Project of Shanghai Science and Technology Committee [14JC1491000]
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Reduced graphene oxide/carbon nanotubes (CNTs) sponge (GCNTS) is fabricated via a simple freeze drying of graphene oxide/CNTs mixed solution and subsequent thermal treatment in nitrogen atmosphere, and used as anodes for sodium-ion batteries (SIBs) for the first time. The morphology, structure and electrochemical performance of GCNTS are characterized by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, nitrogen adsorption-desorption isotherms, galvanostatic charge/discharge tests, cyclic voltammetry and electrochemical impedance spectroscopy, respectively. The results show that GCNTS with 20 wt % CNTs has a highest charge capacity of 436 mA h g(-1) after 100 cycles at a current density of 50 mA g(-1) and even at a high current density of 10 A g(-1), a capacity of 195 mA h g(-1) is maintained after 7440 cycles. The high capacity, excellent rate performance and long life cycling enable the GCNTS to be a promising candidate for practical SIBs. (C) 2016 Elsevier B.V. All rights reserved.
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