Hydrothermal synthesis of Co3O4 with different morphologies towards efficient Li-ion storage
Hydrothermal synthesis of Co3O4 with different morphologies towards efficient Li-ion storage
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DOI：
10.1039/c3ra45904g
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发表时间：
2014-01
期刊：
影响因子：
3.9
通讯作者：
Lingling Jin;Xiaowei Li;H. Ming;Haohe Wang;Zhenyong Jia;Yue Fu;J. Adkins;Qun Zhou;Junwei Zhe
中科院分区：
文献类型：
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作者：
Lingling Jin;Xiaowei Li;H. Ming;Haohe Wang;Zhenyong Jia;Yue Fu;J. Adkins;Qun Zhou;Junwei Zhe
在这项研究中，Co 3 O 4具有不同的形貌（叶，片，立方体）成功地合成了一个简单的水热法，然后煅烧处理。对具有不同形貌结构的代表性样品作为锂离子电池负极材料进行了比较和评价。相对于Co 3 O 4片状和Co 3 O 4立方体样品，Co 3 O 4片状样品表现出优异的电化学性能和高的储存容量（0.1 C下40次循环后为1245 mA h g−1）和出色的上级倍率性能（对于1028、1085、1095、1038和820 mA h g−1，分别为0.1、0.2、0.5、1和2 C）;有趣的是，样品越薄，性能越好。此外，通过循环伏安法和电化学阻抗谱的表征，我们得出的结论是，超薄结构导致更短的路径长度的锂离子和电子的传输，有利于导电性和快速的充放电速率。更重要的是，对于Co 3 O 4，各自结构的厚度程度对锂离子电池中的电化学性能有很大影响。这一新概念可以扩展到制备用于先进能量存储和转换设备的其他阳极和阴极材料。
In this study, Co3O4 with different morphologies (leaf, sheet, and cube) are successfully synthesized by a facile hydrothermal method followed by calcination treatment. Representative samples with different morphological structures are compared and evaluated as anode materials in lithium-ion batteries. Relative to the Co3O4-sheet and Co3O4-cube samples, the Co3O4-leaf samples exhibit excellent electrochemical performance with high storage capacity (1245 mA h g−1 after 40 cycles at 0.1 C) and superior rate capability (0.1, 0.2, 0.5, 1, and 2 C for 1028, 1085, 1095, 1038, and 820 mA h g−1, respectively); interestingly, the thinner the samples are, the better their performance. Moreover, assisted by characterization by cyclic voltammetry and electrochemical impedance spectroscopy, we draw a conclusion that the ultra-thin structures result in shorter path lengths for the transport of lithium ions and electrons, benefiting conductivity and fast charge–discharge rates. More importantly, for Co3O4, the respective structure's degree of thickness has a great effect on the electrochemical performance in lithium-ion batteries. This new concept might be extended to prepare other anode and cathode materials for advanced energy storage and conversion devices.