School of Chemistry Science and Engineering, Yunnan University, Kunming 650091, Yunnan, China.
Nanoscale. 2014 May 21;6(10):5491-7. doi: 10.1039/c4nr00930d.
An effective approach of simultaneously coordinating etching and precipitation reactions is employed to prepare hollow crossed NiCo2O4 nanocubes as anode materials for lithium-ion batteries. Firstly, amorphous hollow (NiCox)O(OH) nanoboxes form uniformly, and subsequent calcination results in the formation of NiCo2O4 nanocubes that exhibit a stable reversible capacity of 1160 mA h g(-1) at constant current density of 200 mA g(-1) with capacity retention of over 91.1% after 200 cycles. The unique hollow structure can shorten the Li-ion diffusion path, which benefits the rate of performance. Furthermore, the hollow structure offers a sufficient void space to alleviate the mechanical stress caused by volume change. Additionally, the multi-element characteristics of active materials allow the volume change to take place in a stepwise manner. Therefore, hollow crossed NiCo2O4 nanocube electrodes exhibit excellent electrochemical performance. This method is simple and of low cost, which may open a new avenue for fast synthesis of hollow crossed structural nano-functional materials for energy storage, catalysts, sensors and other new applications.
采用一种有效的同时协调蚀刻和沉淀反应的方法来制备空心交叉 NiCo2O4 纳米立方体作为锂离子电池的阳极材料。首先，均匀地形成非晶态空心（NiCox）O(OH)纳米盒，随后的煅烧导致形成 NiCo2O4 纳米立方体，在 200 mA g(-1)的恒定电流密度下具有稳定的可逆容量为 1160 mA h g(-1)，经过 200 次循环后容量保持率超过 91.1%。独特的空心结构可以缩短锂离子的扩散路径，从而提高性能的速率。此外，空心结构提供了足够的空隙空间来缓解由体积变化引起的机械应力。此外，活性材料的多元素特性允许体积变化分阶段进行。因此，空心交叉 NiCo2O4 纳米立方体电极表现出优异的电化学性能。这种方法简单且成本低，可能为储能、催化剂、传感器和其他新应用的快速合成空心交叉结构纳米功能材料开辟新途径。
