Controllable preparation of wrapped Fe2O3@rGO composites and their lithium ion storage performance
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摘要: 本研究通过溶剂热法成功制备还原氧化石墨烯包覆Fe2O3空心球复合物（Fe2O3@rGO），并对其结构和性能进行了表征和测试。结果表明，包覆型Fe2O3@rGO负极材料由于内部存在大量的Fe−O−C键，明显提升了电子传输速率，同时石墨烯的物理限域显著降低了电极材料的粉化速率，因此，包覆型Fe2O3@rGO电极材料表现出优异的倍率性能（在大电流5 A/g下具有514 mA·h/g的可逆容量）和长循环寿命（在0.5 A/g下循环500圈后，容量保持987 mA·h/g，保持率为81.1%）。此项工作为制备高倍率、长寿命的石墨烯复合负极材料提供了一种有效策略。Abstract: In this paper, reduced graphene oxides wrapped hollow Fe2O3 spheres (Fe2O3@rGO) were successfully prepared by solvothermal method. Results show that plenty of Fe−O−C bonds between reduced graphene oxides and Fe2O3 significantly improved electron transfer rate of the composite anodes, and confinement effect of reduced graphene oxides slowed the pulverization rate of Fe2O3 during charge/discharge process. As expected, wrapped structured Fe2O3@rGO anode exhibited high rate capability of 514 mA·h/g at high current of 5.0 A/g and durable cycling life over 500 cycles with a capacity of 987 mA·h/g under 0.5 A/g with a capacity retention of 81.1%. This work provides an effective strategy for the preparation of high-rate and long-life graphene composite anode materials.
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Key words:
- Fe2O3 /
- hollow sphere /
- RGO /
- anode /
- lithium-ion battery
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图 1 所制备样品的（a）XRD谱图；（b）Raman谱图；（c）N2吸附-脱附曲线（插图为孔径分布）；（d）XPS全谱谱图；（e）C1s和（f） O1s谱图
Figure 1 (a) XRD patterns; (b)Raman spectra; (c)Nitrogen adsorption/desorption isotherm (inset is pore size distribution); (d) Survey XPS spectra; (e) C1s spectra and (f) O1s spectra for Fe2O3/rGO and Fe2O3@rGO
图 2 样品的SEM照片（(a)、(b)）Fe2O3@rGO和（(c)、(d)）Fe2O3/rGO （图中箭头所指为还原氧化石墨烯）（e）包覆型Fe2O3@rGO复合结构的合成机制图
Figure 2 SEM images of ((a), (b)) Fe2O3@rGO and ((c), (d)) Fe2O3/rGO composites; (e) Schematic illustration of the formation of rGO wrapped Fe2O3 microspheres (Fe2O3@rGO)
图 3 （（a）、（b））Fe2O3@rGO 和（（c）、（d））Fe2O3/rGO的TEM和HRTEM照片
Figure 3 TEM and HRTEM images of ((a), (b)) Fe2O3@rGO and ((c), (d)) Fe2O3/rGO composites
图 4 样品的电化学性能图：（a）循环伏安曲线；（b）倍率性能；（（c）、（d））不同电流密度下的充放电曲线；（e）循环性能；（f）库伦效率；（g）不同电极材料循环200圈后的电化学阻抗
Figure 4 (a) CV curves; (b) Rate performance; ((c), (d)) Charge-discharge profiles at different current density; (e) Cycling performance of the obtained samples; (f) Coulombic efficiency and (g) Electrochemical impedance spectra (EIS) of Fe2O3@rGO and Fe2O3/rGO anodes after 200 cycles
图 5 循环200圈后的电极材料的TEM照片（(a)、(b)）包覆型Fe2O3@rGO；（(c)、(d)）担载型Fe2O3/rGO（插图为相应的衍射花样）
Figure 5 TEM images of anode materials after 200 cycles: ((a)、(b)) Fe2O3@rGO; ((c)、(d)) Fe2O3/rGO（inset is corresponding SAED pattern）
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