用于锂离子电池的FeSb₂-Al₂O₃-C纳米复合负极

FeSb₂-Al₂O₃-C nanocomposite anodes for lithium-ion batteries.

作者信息

Allcorn Eric, Manthiram Arumugam

机构信息

Materials Science and Engineering Program & Texas Materials Institute The University of Texas at Austin Austin, Texas 78712, United States.

出版信息

ACS Appl Mater Interfaces. 2014 Jul 23;6(14):10886-91. doi: 10.1021/am500448f. Epub 2014 Mar 24.

DOI:10.1021/am500448f

PMID:24661574

Abstract

FeSb2-Al2O3-C nanocomposite synthesized by ambient-temperature high-energy mechanical milling (HEMM) of Sb2O3, Fe, Al, and C has been investigated as an anode material for lithium-ion batteries. The FeSb2-Al2O3-C nanocomposites are characterized with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM). The characterization data reveal it to be composed of crystalline FeSb2 nanoparticles finely dispersed in an amorphous matrix of Al2O3 and carbon. The FeSb2-Al2O3-C nanocomposite exhibits an initial discharge (lithiation) capacity of 877 mAh g(-1) and an initial charge (delithiation) capacity of 547 mAh g(-1), yielding an initial coulombic efficiency of 62%. The extended cycling performance for this composite is far superior to that of the intermetallic FeSb2 or a similarly prepared FeSb2-C composite. FeSb2-Al2O3-C retains a specific capacity of ∼350 mAh g(-1) after 500 lithiation/delithiation cycles.

摘要

通过对Sb2O3、Fe、Al和C进行室温高能机械研磨（HEMM）合成的FeSb2-Al2O3-C纳米复合材料已被研究作为锂离子电池的负极材料。采用X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）和高分辨率透射电子显微镜（HRTEM）对FeSb2-Al2O3-C纳米复合材料进行了表征。表征数据表明，它由精细分散在Al2O3和碳的非晶基体中的结晶FeSb2纳米颗粒组成。FeSb2-Al2O3-C纳米复合材料的首次放电（锂化）容量为877 mAh g(-1)，首次充电（脱锂）容量为547 mAh g(-1)，首次库仑效率为62%。该复合材料延长的循环性能远优于金属间化合物FeSb2或类似制备的FeSb2-C复合材料。经过500次锂化/脱锂循环后，FeSb2-Al2O3-C的比容量保持在~350 mAh g(-1)。