期刊
JOURNAL OF POWER SOURCES
卷 196, 期 13, 页码 5645-5650出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2011.02.046
关键词
Li-ion battery; Ammonium divanadate nanobelt; Hydrothermal method; Sodium dodecyl benzene sulfonate; Electrochemical performance
资金
- Major State Basic Research Development Program of China (973 Program) [2010CB227204]
- National Natural Science Foundation of China [50972165]
- Graduate Degree Thesis Innovation Foundation of Central South University [1960-71131100017]
(NH4)(0.5)V2O5 nanobelt is synthesized by sodium dodecyl benzene sulfonate (SOBS) assisted hydrothermal reaction as a cathode material for Li-ion battery. The as-prepared (NH4)(0.5)V2O5 nanobelts are 50-200 nm in diameter and several micrometers in length. The reversible lithium intercalation behavior of the nanobelts has been evaluated by cyclic voltammetry, galvanostatic discharge-charge cycling, and electrochemical impedance spectroscopy. The (NH4)(0.5)V2O5 delivers an initial specific discharge capacity of 225.2 mAh g(-1) between 1.8 and 4.0 V at 15 mA g(-1), and still maintains a high discharge capacity of 197.5 mAh g(-1) after 11 cycles. It shows good rate capability with a discharge capacity of about 180 mAh g(-1) remaining after 40 cycles at various rates and excellent cycling stability with the capacity retention of 81.9% after 100 cycles at 150 mA g(-1). Interestingly, the excess 120 mAh g(-1) capacity in the first charge process is observed, most of which could be attributed to the extraction of NH4+ group, verified by Fourier transform Infrared (FT-IR) and X-ray diffraction (XRD) results. (C) 2011 Published by Elsevier B.V.
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