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Fracture of nanostructured Sn/C anodes during Li-insertion

机译：锂插入过程中纳米结构Sn / C阳极的断裂

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摘要

Sn/C nanocomposites, in the form of Sn or SnO_2 islands attached on carbon surfaces, provide a high initial capacity when used as anodes in rechargeable Li-ion batteries. Upon Li-insertion, however, the Sn undergoes significant volume changes which result in fracture and, hence, a fade in capacity. In the present study a detailed electron microscopy analysis was used for the first time to document the fracture that occurred throughout the Li-insertion and de-insertion process. Particularly, scanning and transmission (SEM&TEM) electron microscopy was performed on four different Sn/C nanocomposites, before and after, electrochemical cycling. Analysis of the Sn particle size distribution showed that the greatest amount of fracture occurred during the first cycle. It was concluded that both the particle volume average and the area fraction of the as prepared Sn or SnO_2 islands must be kept at low values in order to minimize fracture and, therefore, retain a stable capacity. A simple empirical expression was, hence, presented to relate the capacity with the initial microstructure.
机译：当以Sn或SnO_2岛的形式附着在碳表面上的Sn / C纳米复合材料用作可再充电锂离子电池的阳极时，具有很高的初始容量。然而，在插入锂之后，锡经历明显的体积变化，这导致断裂，因此容量下降。在本研究中，首次使用详细的电子显微镜分析来记录在整个Li插入和去插入过程中发生的断裂。特别地，在电化学循环之前和之后，在四种不同的Sn / C纳米复合材料上进行扫描和透射（SEM＆TEM）电子显微镜检查。对Sn粒度分布的分析表明，在第一个循环中发生的断裂量最大。结论是，所制备的Sn或SnO_2岛的颗粒体积平均值和面积分数都必须保持在低值，以使破裂最小化，因此，保持稳定的容量。因此，提出了一个简单的经验表达式，将容量与初始微观结构相关联。

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  • 来源
    《Materials Science and Engineering》 |2011年第2011期|p.55-61|共7页
  • 作者

    Katerina E. Aifantis; Meghan Haycock; Paul Sanders; Stephen A. Hackney;

  • 作者单位

    Lab of Mechanics and Materials, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece, Department of Physics, Michigan Technological University, Houghton, Ml 49931, USA;

    Department of Materials Science and Engineering, Michigan Technological University, Houghton, MI49931, USA;

    Department of Materials Science and Engineering, Michigan Technological University, Houghton, MI49931, USA;

    Lab of Mechanics and Materials, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece,Department of Materials Science and Engineering, Michigan Technological University, Houghton, MI49931, USA;

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  • 正文语种 eng
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  • 关键词

    microstructure fracture nanocomposites anodes;

    机译：微观结构断裂纳米复合阳极;

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