Fe3O4 nanoparticles encapsulated in electrospun porous carbon fibers with a compact shell as high-performance anode for lithium ion batteries
Fe3O4 nanoparticles encapsulated in electrospun porous carbon fibers with a compact shell as high-performance anode for lithium ion batteries
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Fe3O4 纳米粒子封装在电纺多孔碳纤维中，具有致密的外壳，作为锂离子电池的高性能阳极
DOI：
10.1016/j.carbon.2015.02.044
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发表时间：
2015-06-01
期刊：
影响因子：
10.9
通讯作者：
Kang, Feiyu
中科院分区：
文献类型：
--
作者：
Qin, Xianying;Zhang, Haoran;Kang, Feiyu
采用简单的单喷嘴静电纺丝工艺和热处理工艺制备了包裹在多孔碳纤维（Fe3O4@PCFs）中作为锂离子电池负极材料的Fe3O4纳米颗粒。利用含Fe3O4纳米粒子的聚丙烯腈（PAN）和聚苯乙烯（PS）混合溶液制备了Fe3O4@PS/PAN混合前驱纤维。通过PS和PAN的热分解，形成了由致密碳壳和嵌入Fe3O4的蜂窝状碳芯组成的多孔Fe3O4/碳杂化纤维。Fe3O4@PCF复合材料的初始可逆容量为1015 mAh g(-1)，在0.2 a g（-1）电流密度下循环80次后容量保持率为84.4%。该电极还表现出优异的倍率性能，电流密度从0.1增加到2.0 A g(-1)，在2.0 A g（-1）下循环200次后容量保持91%。这些优异的性能归功于多孔碳纤维的高导电性和结构稳定性，其独特的结构不仅缓冲了Fe3O4与内部空间的体积变化，而且作为离子和电子的高效传输途径。此外，紧凑的碳壳可以促进纤维表面形成稳定的固体电解质界面。(C) 2015 Elsevier Ltd.版权所有。
Fe3O4 nanoparticles encapsulated in porous carbon fibers (Fe3O4@PCFs) as anode materials in lithium ion batteries are fabricated by a facile single-nozzle electrospinning technique followed by heat treatment. A mixed solution of polyacrylonitrile (PAN) and polystyrene (PS) containing Fe3O4 nanoparticles is utilized to prepare hybrid precursor fibers of Fe3O4@PS/PAN. The resulted porous Fe3O4/carbon hybrid fibers composed of compact carbon shell and Fe3O4-embeded honeycomb-like carbon core are formed due to the thermal decomposition of PS and PAN. The Fe3O4@PCF composite demonstrates an initial reversible capacity of 1015 mAh g(-1) with 84.4% capacity retention after 80 cycles at a current density of 0.2 A g(-1). This electrode also exhibits superior rate capability with current density increasing from 0.1 to 2.0 A g(-1), and capacity retention of 91% after 200 cycles at 2.0 A g(-1). The exceptionally high performances are attributed to the high electric conductivity and structural stability of the porous carbon fibers with unique structure, which not only buffers the volume change of Fe3O4 with the internal space, but also acts as high-efficient transport pathways for ions and electrons. Furthermore, the compact carbon shell can promote the formation of stable solid electrolyte interphase on the fiber surface. (C) 2015 Elsevier Ltd. All rights reserved.