Highly ordered mesoporous NiO anode material for lithium ion batteries with an excellent electrochemical performance
Highly ordered mesoporous NiO anode material for lithium ion batteries with an excellent electrochemical performance
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DOI：
10.1039/c0jm03132a
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发表时间：
2011-01-01
影响因子：
--
通讯作者：
Ahn, Hyojun
中科院分区：
文献类型：
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作者：
Liu, Hao;Wang, Guoxiu;Ahn, Hyojun
在这项工作中，我们合成了高度有序的介孔NiO材料的纳米铸造方法使用介孔二氧化硅KIT-6作为硬模板。通过小角X射线衍射（XRD）、氮气吸附/脱附和透射电子显微镜（TEM）对介孔NiO颗粒进行表征。结果表明，所制备的介孔NiO具有Ia 3d对称的有序介孔结构，比表面积高达96 m2/g。介孔NiO材料作为锂离子电池的阳极材料进行了测试，与本体NiO（45.02 kJ mol（-1））相比，表现出低得多的活化能（20.75 kJ mol（-1））。我们发现，介孔NiO电极具有更高的嵌锂动力学比它的本体对应物。介孔NiO在0.1C下50次循环后的比容量仍保持在680 mAh/g，远高于商业块体NiO的比容量（188 mAh/g）。在2C的高倍率下，介孔NiO的放电容量高达515 mAh/g，显示了其在高功率锂离子电池中的应用潜力。
In this work, we have synthesized highly ordered mesoporous NiO materials by a nanocasting method using mesoporous silica KIT-6 as the hard templates. Mesoporous NiO particles were characterized by small angle X-ray diffraction (XRD), nitrogen adsorption/desorption, and transmission electron microscopy (TEM). The results demonstrated that the as-prepared mesoporous NiO had an ordered Ia3d symmetric mesostructure, with a high surface area of 96 m(2)/g. Mesoporous NiO materials were tested as an anode material for lithium ion batteries, exhibiting much lower activation energy (20.75 kJ mol(-1)) compared to the bulk NiO (45.02 kJ mol(-1)). We found that the mesoporous NiO electrode has higher lithium intercalation kinetics than its bulk counterpart. The specific capacity of mesoporous NiO after 50 cycles was maintained 680 mAh/g at 0.1 C, which was much higher than that of the commercial bulk NiO (188 mAh/g). Furthermore, at a high rate of 2C, the discharge capacity of mesoporous NiO was as high as 515 mAh/g, demonstrating the potential to be used for high power lithium ion batteries.