Fe3C@ carbon nanocapsules/expanded graphite as anode materials for lithium ion batteries

被引:69
作者
Huang, You-Guo [1 ]
Lin, Xi-Le [1 ]
Zhang, Xiao-Hui [1 ]
Pan, Qi-Chang [1 ]
Yan, Zhi-Xiong [1 ]
Wang, Hong-Qiang [1 ,3 ]
Chen, Jian-Jun [4 ]
Li, Qing-Yu [2 ]
机构
[1] Guangxi Normal Univ, Sch Chem & Pharmaceut Sci, Guilin 541004, Peoples R China
[2] Guangxi Key Lab Low Carbon Energy Mat, Guilin 541004, Peoples R China
[3] Huanggang Normal Univ, Coll Chem Engn, Hubei Key Lab Proc & Applicat Catalyt Mat, Huanggang 438000, Peoples R China
[4] Tsinghua Univ Shenzhen, Res Inst, Shenzhen 518057, Peoples R China
基金
中国国家自然科学基金;
关键词
Lithium ion batteries; Anode materials; Iron carbide; Expanded graphite; IN-SITU; EXPANDED GRAPHITE; FE; NANOPARTICLES; PERFORMANCE; NANOFIBERS; FE3O4-AT-C; ELECTRODE; CAPACITY; GROWTH;
D O I
10.1016/j.electacta.2015.08.054
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Fe3C@carbonnanocapsules(*)/expanded graphite composite was successfully prepared by a new and facile method, including mix of starting materials and heat treatment of the precursor. It is featured by unique 3-D structure, where expanded graphite acts as scaffold to ensure a continuous entity, and Fe3C particles coated by carbon nanocapsules are embedded intimately. The Fe3C nanoparticles encased in carbon nanocapsules act as catalyst in the modification of SEI film during the cycles. The interesting 3-D architecture which aligns the conductivity paths in the planar direction with expanded graphite and in the axial direction with carbon nanocapsules minimizes the resistance and enhances the reversible capacity. The prepared composite exhibits a high reversible capacity and excellent rate performance as an anode material for lithium ion batteries. The composite maintains a reversible capacity of 1226.2 mAh/g after 75 cycles at 66 mA/g. When the current density increases to 200 mA/g, the reversible capacity maintains 451.5 mAh/g. The facile synthesis method and excellent electrochemical performances make the composite expected to be one of the most potential anode material for lithium ion batteries. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:468 / 475
页数:8
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