期刊
NANO LETTERS
卷 12, 期 5, 页码 2429-2435出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl3004286
关键词
Hollow nanoparticles; cation vacancies; lithium ion battery; in situ study; iron oxide
类别
资金
- U.S. Department of Energy, U.S. DOE-BES [DE-AC02-06CH11357]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- National Science Foundation - Earth Sciences [EAR-0622171]
- Department of Energy - Geosciences [DE-FG02-94ER14466]
- U.S. DOE
- NSERC (Canada)
Material design in terms of their morphologies other than solid nanoparticles can lead to more advanced properties. At the example of iron oxide, we explored the electrochemical properties of hollow nanoparticles with an application as a cathode and anode. Such nanoparticles contain very high concentration of cation vacancies that can be efficiently utilized for reversible Li ion intercalation without structural change. Cycling in high voltage range results in high capacity (similar to 132 mAh/g at 2.5 V), 99.7% Coulombic efficiency, superior rate performance (133 mAh/g at 3000 mA/g) and excellent stability (no fading at fast rate during more than 500 cycles). Cation vacancies in hollow iron oxide nanoparticles are also found to be responsible for the enhanced capacity in the conversion reactions. We monitored in situ structural transformation of hollow iron oxide nanoparticles by synchrotron X-ray absorption and diffraction techniques that provided us clear understanding of the lithium intercalation processes during electrochemical cycling.
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