Journal
CHEMICAL ENGINEERING JOURNAL
Volume 372, Issue -, Pages 1056-1065Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.05.009
Keywords
Na-ion batteries; NaV3O8 cathode nanorods; High capacity; High rate capability; Long lifespan; Pseudocapacitance behavior
Categories
Funding
- National Natural Science Foundation, China [21773057, U1704142, 21403057]
- Postdoctoral Science Foundation, China [2017M621833]
- Program for Innovative Team (in Science and Technology) in University of Henan Province, China [17IRTSTHN003]
- Program for Science and Technology Innovation Talents in Universities of Henan Province, China [18HASTIT008]
- Zhongyuan Thousand People Plan-The Zhongyuan Youth Talent Support Program (in Science and Technology), China [ZYQR201810139]
- Cultivation Plan for Young Core Teachers in Universities of Henan Province, China [2016GGJS-068]
- Natural Science Foundation of Henan Province, China [162300410050]
- Fundamental Research Funds for the Henan Provincial Colleges and Universities in Henan University of Technology, China [2018RCJH01]
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In this study, NaV3O8 nanorods are successfully prepared using nonionic surface-active agents Pluronic-F127 as structure-directing agent. The as-prepared NaV3O8 nanorods calcinated at different temperatures are characterized by various techniques, including X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy. The NaV3O8 calcinated at 400 degrees C for 20 h shows appropriate sizes and uniform morphologies of the nanorods, 4-7 mu m in length and 0.2-0.5 mu m in diameter. The NaV3O8 nanorods as cathode materials for Na-ion batteries deliver high discharge capacity reaching up 110.4 mAh g(-1) at current density of 120 mA g(-1), as well as long lifespan by maintaining capacity of 162.1 mAh g(-1) after 500 charge-discharge cycles. Also, a high reversible capacity of 83.9 mAh g(-1) can be retained after 500 cycles at high rate of 2 A g(-1). The obtained outstanding electrochemical performances are associated with the unique micro-nano structures, which does not only facilitate transport of Na+ ion, but also resist erosion from electrolytes. Overall, the results suggest the promise of NaV3O8 nanorods as cathode materials for high capacity, high power and long lifespan Na-ion batteries. This work may open an innovative route to discover diverse electrode materials with nanostructure for energy storage system.
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