期刊
JOURNAL OF POWER SOURCES
卷 223, 期 -, 页码 1-8出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2012.09.027
关键词
Evaporation synthesis; Iron trifluoride; Intercalation; Conversion; Lithium; Battery
资金
- National Research Foundation of Korea
- Korean government (MEST) [NRF-2009-C1AAA001-0093307]
Facile synthesis of rhombohedral type FeF3 introduced via two consecutive steps is introduced: i) acidic treatment of Fe2O3 followed by thermal evaporation at 80 degrees C resulting in hydrated beta-FeF3 center dot 3H(2)O and ii) a simple thermal decomposition of the as-received beta-FeF3 center dot 3H(2)O at 400 degrees C under an Ar atmosphere. A Rietveld refinement of x-ray diffraction data for the as-synthesized FeF3 indicates the formation of a highly crystalline FeF3 structure with a R (3) over barc space group. To overcome the high ionicity and improve the diffusivity, FeF3 is ball-milled with the aid of carbon (acetylene black). The electrochemical performance of nanosized FeF3 is not favored in voltage range of 1.5-4.5 V because the repetitive intercalation-conversion reaction accelerates the structural disruption within a few cycles, although a high capacity (518 mAh (g-fluoride)(-1) at 20 mA g(-1)) is observed, assisted by the three-electron redox of Fe3+/0. Raising the lower cut-off voltage to 2 V. which allows only intercalation reaction, the FeF3 delivers a high capacity of 224 mAh g(-1) with significantly improved capacity retention (71% at 100th cycle). (C) 2012 Elsevier B.V. All rights reserved.
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