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首页> 外文期刊>Journal of power sources >Studies of the structure of vacuum deposited silicon films on metal substrates as anode materials for Li-ion batteries
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Studies of the structure of vacuum deposited silicon films on metal substrates as anode materials for Li-ion batteries

机译：锂离子电池负极材料在金属基底上真空沉积硅膜的结构研究

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Our prepared vacuum deposited silicon films on Ni and Cu substrates show excellent cycle performance opposing to the conventional silicon film having short cycle life. In this paper, the reasons for this long cycle behavior were studied by the measurements of scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electronic microscopy (TEM) and selected area electron diffraction (SAED). At first glance, it seemed that the vacuum deposited silicon films were amoiphous from XRD. However, we found that the films consisted of nano-particles with polycrystalline structure. Large surface energy and specific volume of the nano-crystals kept the structure stable against collapsing during the expansion and shrinkage process under lithium insertion and extraction. Consequently, the vacuum deposited silicon films presented good cycling performance.
机译：我们制备的在Ni和Cu衬底上真空沉积的硅膜表现出优异的循环性能，这与具有短循环寿命的常规硅膜相反。在本文中，通过扫描电子显微镜（SEM），X射线衍射（XRD），透射电子显微镜（TEM）和选择区域电子衍射（SAED）的测量研究了这种长周期行为的原因。乍一看，真空沉积的硅膜似乎与XRD无关。然而，我们发现该膜由具有多晶结构的纳米颗粒组成。较大的表面能和特定体积的纳米晶体使结构稳定，在锂插入和提取下的膨胀和收缩过程中不会塌陷。因此，真空沉积的硅膜呈现出良好的循环性能。

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