is capable of delivering a high theoretical specific capacity (4200 mAh g) in . However, has poor , huge volume expansion (∼300%), and unstable (SEI) film, especially for micron-sized particles. We proposed and prepared a novel vertical carbon (VG) coating on a porous (p-Si) microparticle structure, which effectively alleviated the volume expansion and inhibited the interface reaction. The synthesized porous silicon p-Si@VG composite exhibited significant enhanced cycling stability and an excellent reversible capacity of 1563 mAh g (capacity retention of 48.6%) after 200 cycles. The vertical carbon nanosheet structure constructed a three-dimensional conductive network. Therefore, the p-Si@VG composite showed better rate capability and higher lithium-ion diffusion rates. This work is expected to promote the application of micron Si-based composites in .

中文翻译：

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原位合成多孔硅微粒复合材料上的垂直石墨烯高性能负极材料


能够提供高理论比容量（4200 mAh g）。然而，其薄膜质量差、体积膨胀巨大（∼300%）且不稳定（SEI），特别是对于微米级颗粒。我们提出并制备了一种新型的多孔（p-Si）微粒结构上的垂直碳（VG）涂层，可有效缓解体积膨胀并抑制界面反应。合成的多孔硅p-Si@VG复合材料表现出显着增强的循环稳定性和200次循环后1563 mAh g的优异可逆容量（容量保持率为48.6%）。垂直的碳纳米片结构构建了三维导电网络。因此，p-Si@VG复合材料表现出更好的倍率性能和更高的锂离子扩散速率。该工作有望推动微米硅基复合材料在航空航天领域的应用。