The facile synthesis of hierarchical porous flower-like NiCo2O4 with superior lithium storage properties
The facile synthesis of hierarchical porous flower-like NiCo2O4 with superior lithium storage properties
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DOI：
10.1039/c3ta11549f
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发表时间：
2013-01-01
影响因子：
11.9
通讯作者：
Srinivasan, Madhavi
中科院分区：
文献类型：
--
作者：
Li, Linlin;Cheah, Yanling;Srinivasan, Madhavi
在这项工作中，我们展示了三维(3D)多孔花状NiCo2O4的简单制备及其作为高性能锂离子电池(LIB)负极材料的应用。均匀的花状NiCo2O4是由厚度约为25 nm的多孔纳米板构建的。详细的研究表明，PVP不仅在控制精细的层次型花状结构的形成方面起着重要的作用，而且还在每个纳米板上形成均匀的孔。根据实验结果，提出了这种独特结构的可能形成机制。由于其有益的结构特征，所制备的NiCo2O4表现出增强的锂存储容量和良好的循环稳定性(类似于100 mA g(-1)下60次循环后的939 mA h g(-1))。这种出色的电化学性能可以归因于纳米板表面的层次化结构和足够的空隙，有效地增加了活性材料和电解液之间的接触面积，减少了Li+的扩散途径，并缓冲了循环过程中的体积变化。
In this work, we demonstrate the facile fabrication of 3-dimensional (3D) hierarchical porous flower-like NiCo2O4 and its application as an anode material in high-performance lithium ion batteries (LIBs). The uniform flower-like NiCo2O4 is built from porous nanoplates with thicknesses of approximately 25 nm. A detailed investigation reveals that PVP plays an important role, not only in controlling the formation of the delicate hierarchical flower-like structure, but also in creating the uniform pores of each nanoplate. Furthermore, a possible formation mechanism for this unique structure is proposed based on the experimental results. As a virtue of its beneficial structural features, the as-prepared NiCo2O4 exhibits an enhanced lithium storage capacity and excellent cycling stability (similar to 939 mA h g(-1) at 100 mA g(-1) after 60 cycles). This remarkable electrochemical performance can be attributed to the hierarchical structure and sufficient void space within the surface of the nanoplates, which effectively increases the contact area between the active materials and the electrolyte, reducing the Li+ diffusion pathway and buffering the volume change during cycling.