期刊
ELECTROCHIMICA ACTA
卷 151, 期 -, 页码 214-221出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.11.013
关键词
Antimony/carbon composite fiber; Spinning; Anode material; Cycling stability; Electrochemical performance
资金
- Independent Innovation Foundations of Shandong University [2012ZD001, 2012JC013]
- Doctoral Program of Higher Education of China [20130131110068]
- New Century Excellent Talent Program [NCET-10-0545]
- State Education Ministry
- Natural Science Fund for Distinguished Young Scholars of Shandong [JQ201312]
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.
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