Sb-MOx-C (M = Al, Ti, or Mo) Nanocomposite Anodes for Lithium-Ion Batteries
Sb-MOx-C (M = Al, Ti, or Mo) Nanocomposite Anodes for Lithium-Ion Batteries
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DOI：
10.1021/cm901495h
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发表时间：
2009-07
影响因子：
8.6
通讯作者：
Sukeun Yoon;A. Manthiram
中科院分区：
文献类型：
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作者：
Sukeun Yoon;A. Manthiram
采用机械化学还原法，在碳（乙炔黑）存在下，分别用Al、Ti和Mo还原Sb 2 O3，合成了Sb-MOx-C（M = Al、Ti和Mo）纳米复合材料。X射线衍射（XRD），X射线光电子能谱（XPS），透射电子显微镜（TEM）和扫描透射电子显微镜（STEM）的数据表明，这些纳米复合材料是由均匀分散的纳米结构的锑在无定形Al 2 O3，TiO 2，或MoO 3矩阵，沿着导电碳。与纯锑相比，这些复合电极在锂电池中表现出优异的电化学循环性能和倍率性能。在所研究的三种Sb-MOx-C体系中，以Al 2 O3为非晶相的M = Al体系表现出最好的电化学性能，100次循环后的容量>430 mAh/g。循环性能的改善，与纯锑相比，归因于均匀分布的电化学活性锑纳米粒子。
Sb-MOx-C (M = Al, Ti, and Mo) nanocomposites have been synthesized by a mechanochemical reduction of Sb2O3 with, respectively, Al, Ti, and Mo, in the presence of carbon (acetylene black). X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and scanning transmission electron microscopy (STEM) data reveal that these nanocomposites are composed of uniformly dispersed nanostructured antimony in the amorphous Al2O3, TiO2, or MoO3 matrix, along with conductive carbon. These composite electrodes exhibit excellent electrochemical cycling performance and rate capability in lithium cells, compared to pure antimony. Among the three Sb-MOx-C systems studied, the M = Al system with Al2O3 as the amorphous phase exhibits the best electrochemical performance, offering a capacity of >430 mAh/g after 100 cycles. The improvement in the cycling performance, compared to that of pure antimony, is attributed to a homogeneous distribution of the electrochemically active Sb nan...