A Facile Synthetic Approach to Reduced Graphene Oxide-Fe₃O₄ Composite as High Performance Anode for Lithium-ion Batteries

Yanhong Chang^1,2，Jing Li^1,3，Bin Wang³，Hui Luo⁴，Linjie Zhi³

1. School of Civil and Environmental Engineering,University of Science and Technology Beijing2. Key Laboratory of Educational Ministry for High Efficient Mining and Safety in Metal Mine,University of Science and Technology Beijing3. National Center for Nanoscience and Technology4. School of Chemical and Biological Engineering,University of Science and Technology Beijing

摘 要：Reduced graphene oxide-Fe₃O₄（rGO—Fe₃O₄） composite has been prepared via a facile and effective hydrothermal method by synthesizing Fe₃O₄ nanospheres on the planes of reduced graphene oxide（rGO）.Characterizations suggest the successful attachment of Fe₃O₄ nanospheres to rGO sheets.The rGO—Fe₃O₄composite（66.7 wt%of Fe₃O₄ in the composite） exhibits a stable capacity of 668 mAh g^-1 without noticeable fading for up to 200 cycles in the voltage range of 0.001—3.0 V,and the superior performance of rGO-Fe₃O₄ is clearly established by comparison of the results with those from bare Fe₃O₄ nanospheres(capacity declined to 117 mAh g^-1 only at the 200 th cycle).The excellent electrochemical performance of rGO—Fe₃O₄ composite can be attributed to the fact that the uniform dispersion of the Fe₃O₄ nanospheres growing on the rGO sheets avoids aggregation during Li uptake-release cycling,which is desired for cycle stability.Meanwhile,the rGO sheets afford not only elastic buffer to alleviate the volume variations of Fe₃O₄nanospheres,but also good ionic and electronic transport medium in the electrode.

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