石墨烯负载Fe_2O_3纳米复合材料及储能性能研究
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摘要
针对锂离子电池体系,以提高负极材料可逆充放电容量为目的,制备了Fe2O3-石墨烯纳米复合材料,并利用XRD、SEM对其结构和形貌进行了表征分析,通过恒流充放电测试对其电化学性能进行系统研究。采用水热法成功制备了二元的Fe2O3-石墨烯纳米复合材料,纳米Fe2O3分布较为均匀,形貌多为菱形块状或类球状多面体,且与石墨烯片相互交叠,有效抑制了双方的团聚,形成了有利于储锂的堆砌结构。电化学性能测试表明,Fe2O3-石墨烯纳米复合材料的储锂性能大大优于石墨烯和纳米Fe2O3,30次循环后,可逆容量仍高达1 252mAh/g,循环性能优异;随着石墨烯加入量的增大,Fe2O3-石墨烯纳米复合材料的可逆容量越高。
The graphene and Fe2O3-graphene nanocomposite were prepared to improve the reversible specific capacities of anode materials for lithium-ion batteries.The XRD and SEM were adopted to characterize the microstructure and morphology of the as-prepared materials.The electrochemical performance of as-prepared composites was investigated by galvanostatic discharged and charged test in detail.Fe2O3-graphene nanocomposite was prepared by hydrothermal method to improve the lithium storage capacity.The results show that Fe2O3 nanoparticles were successfully deposited onto the surfaces of graphene sheets,and Fe2O3 nanoparticles which had a uniformly cubical or spherical morphology.Electrochemical tests show that Fe2O3-graphene nanocomposite possesses higher reversible capacity than graphene or Fe2O3 nanoparticles due to formation of a microporous structure between graphene and Fe2O3 nanoparticles for lithium storage.The reversible capacity of Fe2O3-graphene nanocomposite still was 1 252mAh/g after 30 cycles.The more increase of grephene,the higher reversible capacity of Fe2O3-graphene nanocomposite was obtained.In addition,Fe2O3-graphene nanocomposite has an excellent cycle performance and rate performance under high current density.
The graphene and Fe2O3-graphene nanocomposite were prepared to improve the reversible specific capacities of anode materials for lithium-ion batteries.The XRD and SEM were adopted to characterize the microstructure and morphology of the as-prepared materials.The electrochemical performance of as-prepared composites was investigated by galvanostatic discharged and charged test in detail.Fe2O3-graphene nanocomposite was prepared by hydrothermal method to improve the lithium storage capacity.The results show that Fe2O3 nanoparticles were successfully deposited onto the surfaces of graphene sheets,and Fe2O3 nanoparticles which had a uniformly cubical or spherical morphology.Electrochemical tests show that Fe2O3-graphene nanocomposite possesses higher reversible capacity than graphene or Fe2O3 nanoparticles due to formation of a microporous structure between graphene and Fe2O3 nanoparticles for lithium storage.The reversible capacity of Fe2O3-graphene nanocomposite still was 1 252mAh/g after 30 cycles.The more increase of grephene,the higher reversible capacity of Fe2O3-graphene nanocomposite was obtained.In addition,Fe2O3-graphene nanocomposite has an excellent cycle performance and rate performance under high current density.
引文
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[3]Huang Lei,Zhang Yanhua,Tu Ming sheng.Preparation and application of lithium ion batteries graphene-based metal oxide anode materials[J].Journal of Functional Materials,2014,45(8):13-18.
[4]Zhi Linjie,Fang Yan,Kang Feiyu.Graphene based electrode materials for lithium ion batteries:energy storage properties and prospects[J].New Carbon Materials,2011,26(1):5-8.
[5]Paek S M,Yoo E J,Honma I.Enhanced cyclic performance and lithium storage capacity of SnO2/Graphene nanoporous electrodes with three-dimensionally delaminated flexible structure[J].Nano Letters,2009,9(1):72-75.
[6]Yao J,Shen X,Wang B,et al.In situ chemical synthesis of SnO2-graphene nanocomposites as anode materials for lithium-ion batteries[J].Electrochemistry Communications,2009,11(10):1849-1852.
[7]Li F,Zou Q Q,Xia Y Y.CoO-loaded graphitable carbon hollowspheres as anode materials for lithium-ion batteries[J].Power Sources,2008,177(2):546-547.
[8]Yang S,Feng X.Fabrication of graphene-encapsulated oxide nanoparticles towards high-performance anode materials for lithium storage[J].Angewandte Chemie International Edition,2010,49(10):8408-8411.
[9]Kim H,Seo D,Kim S,et al.Highly reversible Co3O4/graphene hybrid anode for lithium rechargeable batteries[J].Carbon,2011,49(1):326-332.
[10]He Y S,Bai D W,Yang X,et al.A Co(OH)2-graphene nanosheets composite as a high performance anode material for rechargeable lithium batteries[J].Electrochemistry Communications,2010,12(4):570-573.
[11]Wang B,Wu X L,Shu C Y,et al.Synthesis of CuO/graphene as a high-performance anode material for lithium-ion batteries[J].Chemistry of Materials,2010,20(47):10661-10664.
[12]Wang H,Cui L,Yang Y,et al.Mn3O4-graphene hybrid as a high-capacity anode material for lithium-ion batteries[J].American Chemical Society,2010,132(40):13978-13980.
[13]Zhou G,Wang D,Li F,et al.Graphene wrapped Fe3O4anode material with improved reversible capacity and cyclic stability for lithium-ion batteries[J].Chemistry of Materials,2010,22(18):5306-5313.