Nb2O5 hollow nanospheres as anode material for enhanced performance in lithium ion batteries
Nb2O5 hollow nanospheres as anode material for enhanced performance in lithium ion batteries
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DOI：
10.1016/j.materresbull.2012.06.004
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发表时间：
2012-09-01
影响因子：
5.4
通讯作者：
Nakashima, Kenichi
中科院分区：
文献类型：
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作者：
Sasidharan, Manickam;Gunawardhana, Nanda;Nakashima, Kenichi
采用核-壳-电晕结构的聚合物胶束，在温和条件下合成了平均直径约29 nm、空腔尺寸约17 nm的Nb2O5空心纳米球。通过透射电镜（TEM）、x射线衍射（XRD）、红外光谱（FTIR）、热分析（TG/DTA）和氮吸附分析对空心颗粒进行了全面表征。首次研究了制备的Nb2O5空心纳米球作为锂离子可充电电池的负极材料。在0.5 c充放电250次循环后，纳米结构电极可提供172 mAh g（-1）的高容量。更重要的是，空心颗粒电极即使暴露在高电流密度6.25 a g（-1）下，也能保持结构完整性和优异的循环稳定性。纳米Nb2O5壳域与空心腔的耦合促进了锂的快速插入/脱插动力学。(C) 2012 Elsevier Ltd.版权所有。
Nb2O5 hollow nanospheres of average diameter ca. similar to 29 nm and hollow cavity size ca. 17 nm were synthesized using polymeric micelles with core-shell-corona architecture under mild conditions. The hollow particles were thoroughly characterized by transmission electron microscope (TEM), X-ray diffraction (XRD), infrared spectroscopy (FTIR), thermal (TG/DTA) and nitrogen adsorption analyses. Thus obtained Nb2O5 hollow nanospheres were investigated as anode materials for lithium ion rechargeable batteries for the first time. The nanostructured electrode delivers high capacity of 172 mAh g(-1) after 250 cycles of charge/discharge at a rate of 0.5 C. More importantly, the hollow particles based electrodes maintains the structural integrity and excellent cycling stability even after exposing to high current density 6.25 A g(-1). The enhanced electrochemical behavior is ascribed to hollow cavity coupled with nanosized Nb2O5 shell domain that facilitates fast lithium intercalation/deintercalation kinetics. (C) 2012 Elsevier Ltd. All rights reserved.