期刊
JOURNAL OF POWER SOURCES
卷 217, 期 -, 页码 54-58出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2012.05.111
关键词
Lithium fluoride; Iron; Electrochemical conversion reaction; High capacity cathode material; Lithium-ion battery
资金
- 973 Program, China [2009CB220103]
Lithium-rich LiF/Fe nanocomposite is prepared by a simple route of mechanical ball-milling of lithium fluoride and iron using rigid TiN nanoparticles as the grinding powders, and studied as a lithium-rich cathode material for satisfying the present Li-ion battery technology. The structural characterizations reveal that the nanocomposite is composed of well-dispersed and intimately contacted LiF and Fe particles created by high-energy ball-milling, forming appropriate electrode-active nanodomains for the reversible conversion reaction of LiF and Fe. Electrochemical measurements demonstrate that the LiF/Fe nanocomposite containing 50 wt% active materials of LiF and Fe can deliver a high reversible capacity of 568 mAh g(-1) at 20 mA g(-1) (calculated using the weight of LiF and Fe only), approaching the theoretical capacity of the composite (600 mAh g(-1)), and also show a strong power capability with a reversible capacity of similar to 300 rnAh g(-1) even at a very high rate of 500 mA g(-1) at room temperature. CV and XRD analyses confirm that the LiF/Fe nanocomposite can nearly realize a three-electron transfer through electrochemical conversion of LiF/Fe to FeF3 and vice versa. These results suggest the possibility to utilize the inexpensive lithium-rich composites of lithium fluoride and metals as high-capacity cathode materials for future-generation Li-ion batteries through the electrochemical conversion. (C) 2012 Elsevier B.V. All rights reserved.
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