期刊
JOURNAL OF POWER SOURCES
卷 245, 期 -, 页码 308-314出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2013.06.110
关键词
Conversion reaction; TEM; Diffusion; Cycling; Nanowire; Battery
资金
- U.S. Department of Energy, Basic Energy Sciences [DE-SC0006509]
- U.S. Department of Energy (DOE) [DE-SC0006509] Funding Source: U.S. Department of Energy (DOE)
This work describes the evolution of alpha-Fe2O3 nanowires during the conversion reaction associated with lithium intercalation. An electrical resistive heating method synthesizes single crystal hematite (alpha-Fe2O3) nanowires. Transmission electron microscopy characterizes this anode material at various stages of lithiation and delithiation. The process initiates through the reduction of alpha-Fe2O3 to nanocrystalline Fe3O4. Further lithiation converts all of the iron oxide to nanocrystalline BCC Fe. During delithiation, the reactions proceed via conversion of Fe to Fe2O3. However, a nanocrystalline structure replaces the initial single crystalline alpha-Fe2O3 after the first circle. This polycrystalline nanowire structure persists for over 30 cycles. (C) 2013 Elsevier B.V. All rights reserved.
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