In this work, we synthesized the hollowed carbon@Si cubic nanobox sandwiched by reduced graphene oxide (HC@Si@rGO) using the template-sacrificial method for lithium-ions batteries’ (LIBs’) anode with high specific capacity and ultra-stable long cyclic performance. During the preparation, the ZIF-8 was initially etched by Si(OH)4 to generate the hollowed ZIF-8 and instantaneously in-situ formation of SiO2 coatings on ZIF-8, resulting in synthesis of ZIF-8@SiO2. Afterwards, the ZIF-8@SiO2 was reduced to HC@Si by the magnesium thermal treatment while the NaCl was employed as a heat-removing agent. Successfully, the rGO was introduced coupling with HC@Si to obtain HC@Si@rGO. As anode for LIBs, it delivers high initial discharge capacity of 3712.9 mAh g[Formula: see text] at the current density of 0.1 A g[Formula: see text]. After 130 cycles, a stable specific capacity of 1311.0 mAh g[Formula: see text] is achieved. The long charge/discharge performance of HC@Si@rGO anode is demonstrated at 0.5 A g[Formula: see text], exhibiting the specific capacity of 595.4 mAh g[Formula: see text] after 500 cycles. Based on the electrochemical analysis, these remarkable performances are attributed to the unique nanostructure of HC@Si@rGO. Essentially, the inner-layered HC acts as a buffer matrix to reinforce the mechanical strength of the entire electrode and restrain the volume change of Si during the charge/discharge. On the other hand, the evenly distributed HC@Si is fixed within the flexible rGO sheets to form the network structure, which not only promises a good conductive connection between HC@Si but also prevents the continuous formation of solid electrolyte interface film.

中文翻译：

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为具有高容量和长循环稳定性的锂离子电池设计中空碳@Si立方纳米盒@还原氧化石墨烯纳米结构

在这项工作中，我们使用模板牺牲法合成了夹在还原氧化石墨烯（HC@Si@rGO）中的空心碳@Si立方纳米盒，用于具有高比容量和超稳定的锂离子电池（LIBs）负极。长循环性能。在制备过程中，ZIF-8 最初由 Si(OH)4生成中空的 ZIF-8 并瞬间原位形成 SiO2ZIF-8 上的涂层，导致 ZIF-8@SiO 的合成2. 随后，ZIF-8@SiO2通过镁热处理将其还原为HC@Si，而NaCl用作除热剂。成功地引入了rGO与HC@Si耦合以获得HC@Si@rGO。作为 LIB 的负极，它在 0.1 A g[公式：见文本]的电流密度下提供 3712.9 mAh g[公式：见文本]的高初始放电容量。130次循环后，达到1311.0 mAh g[公式：见正文]的稳定比容量。HC@Si@rGO负极的长充放电性能在0.5 A g[公式：见正文]下得到证明，500次循环后的比容量为595.4 mAh g[公式：见正文]。基于电化学分析，这些卓越的性能归因于 HC@Si@rGO 独特的纳米结构。本质上，内层HC作为缓冲基质，增强整个电极的机械强度，抑制充放电过程中Si的体积变化。另一方面，均匀分布的HC@Si被固定在柔性rGO片内形成网络结构，不仅保证了HC@Si之间良好的导电连接，而且阻止了固体电解质界面膜的连续形成。