标题：Fe3O4nanoparticles embedded in carbon-framework as anode material for high performance lithium-ion batteries
作者：Yu, Yang ;Zhu, Yongchun ;Gong, Huaxu ;Ma, Yanmei ;Zhang, Xing ;Li, Na ;Qian, Yitai
作者机构：[Yu, Yang ;Zhu, Yongchun ;Gong, Huaxu ;Ma, Yanmei ;Zhang, Xing ;Li, Na ;Qian, Yitai ] Hefei National Laboratory for Physical Science at Microscale, De 更多
摘要：Fe3O4/C composites have been prepared by sucrose calcining with Fe3O4particles obtained from ferrous oxalate decomposition. The scanning electron microscopy (SEM) images show that Fe3O4nanoparticles (Fe3O4NPS) with average size of 200 nm are embedded in the three-dimensional (3D) carbon-framework. As an anode material for rechargeable lithium-ion batteries, the Fe3O4/C composite delivers a reversible capacity of 773 mAh g-1at a current density of 924 mA g-1after 200 cycles, higher than that of the bare Fe3O4NPS which only retain a capacity of 350 mAh g-1. When the current density rises to 1848 mA g-1, Fe3O4/C material still remains 670 mAh g-1even after 400 cycles. The enhanced high-rate performance can be attributed to the 3D carbon-framework, which improves the electric conductivity, relaxes the strain stress and prevents the aggregation of Fe3O4particles during the charge/discharge process. © 2012 Elsevier Ltd. All rights reserved.