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首页> 美国卫生研究院文献>Nanomaterials >Silicon-Based Anode of Lithium Ion Battery Made of Nano Silicon Flakes Partially Encapsulated by Silicon Dioxide
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Silicon-Based Anode of Lithium Ion Battery Made of Nano Silicon Flakes Partially Encapsulated by Silicon Dioxide

机译：由纳米硅薄片制成的硅基阳极部分地通过二氧化硅包封

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Ubiquitous mobile electronic devices and rapidly increasing electric vehicles demand a better lithium ion battery (LIB) with a more durable and higher specific charge storage capacity than traditional graphite-based ones. Silicon is among the most promising active media since it exhibits ten times of a specific capacity. However, alloying with lithium by silicon and dissociation of the silicon-lithium alloys induce high volume changes and result in pulverization. The loss of electrical contacts by silicon with the current collector of the anode causes rapid capacity decay. We report improved anode cycling performance made of silicon flakes partially encapsulated by silicon dioxide and coated with conductive nanocarbon films and CNTs. The silicon dioxide surface layer on a silicon flake improves the physical integrity for a silicon-based anode. The exposed silicon surface provides a fast transport of lithium ions and electrons. CNTs and nanocarbon films provide electrical connections between silicon flakes and the current collector. We report a novel way of manufacturing silicon flakes partially covered by silicon dioxide through breaking oxidized silicon flakes into smaller pieces. Additionally, we demonstrate an improved cycling life and capacity retention compared to pristine silicon flakes and silicon flakes fully encapsulated by silicon dioxide. Nanocarbon coatings provide conduction channels and further improve the anode performance.
机译：无处不在的移动电子设备和快速增加的电动车辆需要更好的锂离子电池（Lib），其具有比传统的基于石墨的基于传统的石墨的更高的电荷存储容量。硅是最有前途的活性媒体之一，因为它表现出了十次特定容量。然而，通过硅和硅锂合金的解离的合金化与硅锂合金的解离诱导大体积变化并导致粉碎。通过硅与阳极集电器的电触点丢失导致快速容量衰减。我们报告了由二氧化硅部分包封的硅片制成的改进的阳极循环性能，并涂有导电纳米碳膜和CNT。硅片上的二氧化硅表面层改善了硅基阳极的物理完整性。暴露的硅表面提供锂离子和电子的快速传输。 CNT和纳米碳膜在硅片和集电器之间提供电连接。我们通过将氧化的硅片破碎成较小的块，举报了一种由二氧化硅部分覆盖的硅片的新方法。另外，与通过二氧化硅完全封装的原始硅片和硅片相比，我们证明了改进的循环寿命和容量保持。纳米通料涂层提供导通通道并进一步提高阳极性能。

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