School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University, Tianjin, 300072, P. R. China.
Nanoscale. 2017 Oct 26;9(41):15856-15864. doi: 10.1039/c7nr04786j.
A new strategy for the one-step synthesis of a 0D SnCo nanoparticles-1D carbon nanotubes-3D hollow carbon submicrocube cluster (denoted as SnCo@CNT-3DC) hierarchical nanostructured material was developed via a simple chemical vapor deposition (CVD) process with the assistance of a water-soluble salt (NaCl). The adopted NaCl not only acted as a cubic template for inducing the formation of the 3D hollow carbon submicrocube cluster but also provides a substrate for the SnCo catalysts impregnation and CNT growth, ultimately leading to the successful construction of the unique 0D-1D-3D structured SnCo@CNT-3DC during the CVD of CH. When utilized as a lithium-ion battery anode, the SnCo@CNT-3DC composite electrode demonstrated an excellent rate performance and cycling stability for Li-ion storage. Specifically, an impressive reversible capacity of 826 mA h g after 100 cycles at 0.1 A g and a high rate capacity of 278 mA h g even after 1000 cycles at 5 A g were achieved. This remarkable electrochemical performance could be ascribed to the unique hierarchical nanostructure of SnCo@CNT-3DC, which guarantees a deep permeation of electrolytes and a shortened lithium salt diffusion pathway in the solid phase as well as numerous hyperchannels for electron transfer.
一种通过简单的化学气相沉积（CVD）工艺，在水溶性盐（NaCl）的辅助下，一步合成零维（0D）SnCo 纳米颗粒-一维（1D）碳纳米管-三维（3D）空心碳亚微米立方块簇（记为 SnCo@CNT-3DC）分级纳米结构材料的新策略被开发出来。所采用的 NaCl 不仅作为诱导 3D 空心碳亚微米立方块簇形成的立方模板，还为 SnCo 催化剂浸渍和 CNT 生长提供了基底，最终导致在 CH 的 CVD 过程中成功构建了独特的 0D-1D-3D 结构的 SnCo@CNT-3DC。当用作锂离子电池阳极时，SnCo@CNT-3DC 复合材料电极表现出优异的倍率性能和循环稳定性，用于锂离子储存。具体而言，在 0.1 A g 下循环 100 次后，可获得 826 mA h g 的令人印象深刻的可逆容量，在 5 A g 下循环 1000 次后，仍可获得 278 mA h g 的高倍率容量。这种卓越的电化学性能可归因于 SnCo@CNT-3DC 的独特分级纳米结构，它保证了电解质的深度渗透和固相中锂盐扩散途径的缩短，以及电子转移的大量超通道。
