Nanostructured Antimony/carbon Composite Fibers as Anode Material for Lithium-ion Battery
Nanostructured Antimony/carbon Composite Fibers as Anode Material for Lithium-ion Battery
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DOI：
10.1016/j.electacta.2014.11.013
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发表时间：
2015-01-01
影响因子：
6.6
通讯作者：
Liu, Jiurong
中科院分区：
文献类型：
--
作者：
Lv, Hailong;Qiu, Song;Liu, Jiurong
采用一种简单的纺丝方法，然后在氩气保护下焙烧，成功地制备了Sb/C纳米颗粒均匀分散在碳基中的Sb/C复合纤维。实验结果表明，作为锂离子电池的负极材料，Sb浓度的增加提高了锂离子的储存容量，使循环性能变差。碳基质可以有效地缓冲电极在锂/脱锂过程中的体积变化，保持电极的完整性，提高循环性能。在Sb/C复合纤维中，碳含量约为50.1wt%的Sb/C复合纤维在100mAg(-1)电流密度下循环100次后的可逆容量为315.9 mAHg(-1)，在100、200、400、800和1600mAg(-1)下的容量分别为464.4、395.4、328、246.2和149.8 mAHg(-1)。电化学阻抗谱(EIS)结果表明，SB5比高Sb浓度(SB6)和高碳浓度(SB4)的样品表现出更好的电荷转移速率和锂离子扩散能力，最终导致更好的容量保持和倍率性能。(C)2014爱思唯尔有限公司。保留所有权利。
Antimony/carbon (Sb/C) composite fibers with Sb nanoparticles uniformly dispersed in carbon matrix have been successfully fabricated by a facile spinning approach and the subsequent calcination in argon flux. As the anode materials of lithium-ion battery, experimental results reveal that the increase of Sb concentration enhanced the lithium-ion storage capacity and worsened the cycling performance. Carbon matrix could efficiently buffer the volume change and maintain the integrity of electrode during the lithiation/delithiation, improving the cycling capability. Among the Sb/C composite fibers, the sample (Sb5) with appropriate carbon content of ca. 50.1 wt% achieves a reversible capacity of 315.9 mAh g(-1) after 100 cycles at a current density of 100 mA g(-1) and the capacities of 464.4, 395.4, 328, 246.2 and 149.8 mAh g(-1) at 100, 200, 400, 800 and 1600 mA g(-1), respectively. Electrochemical impedance spectroscopy (EIS) results indicate that Sb5 shows more superior charge transfer rate and Li-ion diffusion ability than the samples with high Sb concentration (Sb6) or carbon concentration (Sb4), finally resulting in better capacity retention and rate performance. (C) 2014 Elsevier Ltd. All rights reserved.