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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Magnesium and magnesium-silicide coated silicon nanowire composite anodes for lithium-ion batteries
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Magnesium and magnesium-silicide coated silicon nanowire composite anodes for lithium-ion batteries

机译：锂离子电池用镁和硅化镁涂覆的硅纳米线复合阳极

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摘要

We synthesized composites consisting of silicon nanowires (SiNWs) coated with magnesium (Mg) and magnesium silicide (Mg2Si) for lithium-ion battery anodes and studied their electrochemical cycling stability and degradation mechanisms. Compared to bare SiNWs, both Mg- and Mg2Si-coated materials show significant improvement in coulombic efficiency during cycling, with pure Mg coating being slightly superior by ~1% in each cycle. XPS measurements on cycled nanowire forests gave quantitative information on the composition of the SEI layer and showed lower Li2CO3 and higher polyethylene oxide content for coated nanowires, thus revealing a passivating effect towards electrolyte decomposition. Extensive characterization of the microstructure before and after cycling was carried out by scanning- and transmission electron microscopy aided by focused ion beam cross-sectioning. The formation of large voids between the nanowire assembly and the substrate during cycling, causing the nanowires to lose electrical contact with the substrate, is identified as an important degradation mechanism.
机译：我们合成了由硅纳米线（SiNWs）涂覆的镁（Mg）和硅化镁（Mg2Si）组成的复合材料，并研究了它们的电化学循环稳定性和降解机理。与裸SiNW相比，涂Mg和Mg2Si的材料在循环过程中都显示出库伦效率的显着提高，纯Mg涂层在每个循环中均具有约1％的优势。在循环的纳米线森林上进行XPS测量可得出有关SEI层组成的定量信息，并显示涂覆的纳米线的Li2CO3含量较低和聚环氧乙烷含量较高，因此显示了对电解质分解的钝化作用。通过聚焦离子束横截面扫描和透射电子显微镜对循环前后的微观结构进行了广泛的表征。在循环期间，纳米线组件和基板之间形成大的空隙，导致纳米线与基板失去电接触，被认为是重要的降解机制。

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