期刊
CHEMISTRY OF MATERIALS
卷 26, 期 22, 页码 6361-6370出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm5025603
关键词
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资金
- Samsung Research Funding Center for Future Technology [SRFC-MA1401-03]
- Energy Efficiency AMP
- Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (ICETEP) from the Ministry of Trade, Industry AMP
- Energy, Republic of Korea [20132020000260]
- National Research Foundation of Korea [NRF-2010-C1AAA001-2010-0029065]
- Mid-Career Researcher Program [2012R1A2A2A01010011]
- U.S. DOE, Office of Science [DE-AC02-06CH11357]
Tin oxide-based materials, operating via irreversible conversion and reversible alloying reaction, are promising lithium storage materials due to their higher capacity. Recent studies reported that nanostructured SnO2 anode provides higher capacity beyond theoretical capacity based on the alloying reaction mechanism; however, their exact mechanism remains still unclear. Here, we report the detailed lithium storage mechanism of an ordered mesoporous SnO2 electrode material. Synchrotron X-ray diffraction and absorption spectroscopy reveal that some portion of Li2O decomposes upon delithiation and the resulting oxygen reacts with Sn to form the SnOx phase along with dealloying of LixSn, which are the main reasons for unexpected high capacity of an ordered mesoporous SnO2 material. This finding will not only be helpful in a more complete understanding of the reaction mechanism of Sn-based oxide anode materials but also will offer valuable guidance for developing new anode materials with abnormal high capacity for next generation rechargeable batteries.
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