Journal
JOURNAL OF POWER SOURCES
Volume 283, Issue -, Pages 289-299Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.02.138
Keywords
Porous carbon nanotubes; Oxygen bridges; Ternary metal oxides; Synergistic effect; Lithium-ion battery
Funding
- NSFC-JSPS [21311140166]
- NSFC [21273222]
- Shandong Province Science and Technology Program [2014GGX102020]
- Higher Educational Science and Technology Program [J14LC08]
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Generally, the fast ion/electron transport and structural stability dominate the superiority in lithium-storage applications. In this work, porous carbon nanotubes decorated with nanosized CoFe2O4 particles (p-CNTs@CFO) have been rationally designed and synthesized by the assistance of supercritical carbon dioxide (scCO(2)). When tested as anode materials for lithium-ion batteries, the p-CNTs@CFO composite exhibits outstanding electrochemical behavior with high lithium-storage capacity (1077 mAh g(-1) after 100 cycles) and rate capability (694 mAh g(-1) at 3 A g(-1)). These outstanding electrochemical performances are attributed to the synergistic effect of porous p-CNTs and nanosized CFO. Compared to pristine CNTs, the p-CNTs with substantial pores in the tubes possess largely increased specific surface area and rich oxygen-containing functional groups. The porous structure can not only accommodate the volume change during lithiation/delithiation processes, but also provide bicontinuous electron/ion pathways and large electrode/electrolyte interface, which facilitate the ion diffusion kinetics, improving the rate performance. Moreover, the CFO particles are bonded strongly to the p-CNTs through metal-oxygen bridges, which facilitate the electron fast capture from p-CNTs to CFO, and thus resulting in a high reversible capacity and excellent rate performance. Overall, the porous p-CNTs provide an efficient way for ion diffusion and continuous electron transport as anode materials. (C) 2015 Elsevier B.V. All rights reserved.
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