α-Fe2O3 Nanoparticle-Loaded Carbon Nanofibers as Stable and High-Capacity Anodes for Rechargeable Lithium-Ion Batteries
α-Fe2O3 Nanoparticle-Loaded Carbon Nanofibers as Stable and High-Capacity Anodes for Rechargeable Lithium-Ion Batteries
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DOI：
10.1021/am300333s
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发表时间：
2012-05-01
影响因子：
9.5
通讯作者：
Zhang, Xiangwu
中科院分区：
文献类型：
--
作者：
Ji, Liwen;Toprakci, Ozan;Zhang, Xiangwu
通过在 N,N-二甲基甲酰胺溶剂中静电纺丝 FeCl3.6H(2)O 盐-聚丙烯腈前驱体并随后在惰性气体中碳化，制备了负载 α-Fe2O3 纳米颗粒的碳纳米纤维复合材料。采用扫描电子显微镜、透射电子显微镜、能量色散X射线能谱、X射线光电子能谱、X射线衍射和元素分析等方法研究了α-Fe2O3-碳纳米纤维复合材料的形貌和成分。结果表明，平均尺寸约为20 nm的α-Fe2O3纳米颗粒沿碳纳米纤维表面均匀分散。所得的α-Fe2O3-碳纳米纤维复合材料直接用作可充电锂半电池的负极材料，并评估了其电化学性能。结果表明，这些α-Fe2O3-碳纳米纤维复合材料用作可充电锂离子电池负极材料时具有高可逆容量、良好的容量保持率和可接受的倍率性能。
alpha-Fe2O3 nanoparticle-loaded carbon nanofiber composites were fabricated via electrospinning FeCl3.6H(2)O salt-polyacrylonitrile precursors in N,N-dimethylformamide solvent and the subsequent carbonization in inert gas. Scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and elemental analysis were used to study the morphology and composition of alpha-Fe2O3-carbon nanofiber composites. It was indicated that alpha-Fe2O3 nanoparticles with an average size of about 20 nm have a homogeneous dispersion along the carbon nanofiber surface. The resultant alpha-Fe2O3-carbon nanofiber composites were used directly as the anode material in rechargeable lithium half cells, and their electrochemical performance was evaluated. The results indicated that these alpha-Fe2O3-carbon nanofiber composites have high reversible capacity, good capacity retention, and acceptable rate capability when used as anode materials for rechargeable lithium-ion batteries.