期刊
RSC ADVANCES
卷 6, 期 100, 页码 97759-97769出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra20314k
关键词
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资金
- National Natural Science Foundation of China [51472211]
- Scientific and Technical Achievement Transformation Fund of Hunan Province [2012CK1006]
- Key Project of Strategic New Industry of Hunan Province [2013GK4068]
- Natural Science Foundation of Hunan Province [2015JJ6103]
- Program for Innovative Research Cultivation Team in University of Ministry of Education of China [1337304]
Spherical FeF2.5 center dot 0.5H(2)O-MWCNTs nanocomposites are synthesized via an ionic liquid (IL) based on precipitation route as a high performance cathode material for lithium ion batteries (LIBs), in which the BMMimBF(4) is used as environmentally friendly fluorine source, appropriate solvent and binder. The addition of MWCNTs can not only increase the conductivity of the active material, but also play a role in designing a especial morphology where nano-sized FeF2.5 center dot 0.5H(2)O particles grew up. The structure, morphology and electrochemical performance of the as-prepared samples have been characterized by X-ray diffraction (XRD), Rietveld refinement of XRD pattern, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and charge/discharge tests. The results show that the spherical FeF2.5 center dot 0.5H(2)O-MWCNTs nanocomposites present the cubic crystal structure with the cell volume of 1.13293 nm(3). Furthermore, it can deliver a high initial discharge capacity of 324.7 mA h g(-1) and stable cycle performance of 175.2 mA h g(-1) after 50 cycles at 40 mA g(-1) between 1.5 V and 4.5 V. Especially, even at a high current density of 500 mA g(-1), the as-prepared material can still display a high discharge capacity of 136.0 mA h g(-1).
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