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首页> 外文期刊>RSC Advances >Two-step ball-milling synthesis of a Si/SiOx/C composite electrode for lithium ion batteries with excellent long-term cycling stability
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Two-step ball-milling synthesis of a Si/SiOx/C composite electrode for lithium ion batteries with excellent long-term cycling stability

机译：具有优异的长期循环稳定性的锂离子电池Si / SiO x / C复合电极的两步球磨合成

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摘要

SiOx-based anodes have attracted tremendous attention owing to their low cost, higher theoretical capacity than graphite and lower volume expansion than pure silicon. In this work, a simple and cost-effective two-step ball-milling method was proposed to fabricate Si/SiOx/C composites by using commercial SiO and graphite carbon as raw materials. The two-step ball-milling synthesis of the Si/SiOx/C composites can avoid the generation of an inert SiC phase and realize the uniform dispersion of Si/SiOx in graphite carbon, which offers good electrical conductivity and relieves the volume expansion of the Si/SiOx phase. Owing to the synergistic effect of the Si/SiOx phase and the graphite carbon, the typical Si/SiOx/C electrode exhibits a stable and high capacity of 726 mA h g?1 after 500 cycles at a current density of 0.1 A g?1 with a capacity retention of 82%. The two-step ball-milling preparation of the Si/SiOx/C composite provides a facile approach to fabricate high-performance SiOx-based anode materials.
机译：SiO x 基阳极由于其低成本，比石墨高的理论容量和比纯硅低的体积膨胀性而备受关注。在这项工作中，提出了一种简单且经济高效的两步球磨法，该方法通过以下方法制备Si / SiO x / C复合材料使用商业SiO和石墨碳作为原料。 Si / SiO x / C复合材料的两步球磨合成可避免生成惰性SiC相并实现Si / SiO x 在石墨碳中的均匀分散，提供了良好的导电性并缓解了Si / SiO 的体积膨胀 x 阶段。由于Si / SiO x 相和石墨碳的协同作用，典型的Si / SiO < em> x / C电极经过500次电流循环后，显示出稳定的高容量726 mA hg ？1 密度为0.1 A g ？1 ，容量保持率为82％。 Si / SiO x / C复合材料的两步球磨制备为制备高性能SiO x 型负极材料。

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