期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 735, 期 -, 页码 833-839出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.11.193
关键词
Energy storage materials; Electrochemical reactions; Nanostructured materials; Composite materials
资金
- National Science Foundation of China [51501107, 51472161, 51671135, 51472160, 21403139]
- Key Program for the Fundamental Research of the Science and Technology Commission of Shanghai Municipality [15JC1490800, 12JC1406900]
- Program of Shanghai Subject Chief Scientist [17XD1403000]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning [TP2014048]
- [ZZslg16063]
Core-shell Fe3O4@Fe ultrafine nanoparticles (nano-Fe3O4@Fe, Fe3O4 content 84 wt%) with a core (Fe) diameter of 5.1 +/- 1.4 nm and a shell (Fe3O4) diameter of 10.9 +/- 1.6 nm is prepared by a liquid-phase pyrolysis and partial oxidation method. It is found that the core-shell Fe3O4@Fe ultrafine nanostructure can efficiently improve the electrochemical performance of Fe3O4 as anode material for Li-ion batteries in terms of rate capability and cycle life. For instance, specific capacities of 884 and 705 mAh/g can be obtained for the nano-Fe3O4@Fe electrode after 100 cycles at 200 mA/g and 500 cycles at 1000 mA/g, respectively. It is believed that these improvements can be attributed to the significant shortened transfer distance of electrons and Li-ions with relatively low specific surface area, ultrahigh electronic conductivity inside the nanoparticles and good ductility to accommodate the asymmetric volume change. (C) 2017 Elsevier B.V. All rights reserved.
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