期刊
JOURNAL OF POWER SOURCES
卷 248, 期 -, 页码 15-21出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.09.063
关键词
Magnetite; Active carbon; Electrochemical properties; Anode materials; Lithium ion batteries
资金
- National Basic Research Program of China [2013CB934003]
- National Nature Science Foundation of China [21273019]
- Fundamental Research Funds for the Central Universities [FRF-MP-12-006B]
The active particle cracking and electrode pulverization of iron oxide anode material as a result of volume expansion during charge/discharge process cause poor reversibility and significant capacity fading in rechargeable lithium-ion batteries. Here, we demonstrate a facile solvothermal route to immobilize the Fe3O4 particles on the porous active carbon. The present method enables us to obtain nano-porous and mosaic structured Fe3O4@C spheres with an average size of ca. 100 nm. The porous active carbon plays an important role in the improvement of electrochemical properties of Fe3O4. It not only acts as a host for the deposition of Fe3O4 particles, but also provides void spaces for active Fe3O4 to buffer the volume expansion. The good contact between Fe3O4 and active carbon ensures the fast electron/Li-ion transport. As a result, the porous Fe3O4@C shows a high reversible specific capacity of similar to 1000 mAh g(-1), good cycle stability and excellent rate capability. Therefore, we believe that this composite is a potential candidate for anode material of high-energy lithium-ion battery. (C) 2013 Elsevier B.V. All rights reserved.
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