CoO/NiO/CoNi复合材料的制备及其储锂性能的研究

将Al72 Ni13.4 Co14.6十次准晶作为前驱体合金,通过去合金化法制备了CoO/NiO/CoNi微纳复合材料作为锂离子电池负极材料。采用X射线衍射( XRD)、扫描电镜( SEM)等材料结构分析方法对产物进行表征。通过恒电流充放电技术研究该电极材料的电化学性能,结果表明,在200 mA·g-1电流密度下,首次充放电容量为417 mAh·g-1和617 mAh·g-1,库伦效率为67.6;,经过500圈循环后放电容量仍保持为585 mAh·g-1,表现出良好的循环性能。

Preparation and Lithium Storage Properties of CoO/NiO/CoNi Composites

Al76 Ni13. 4 Co14. 6 decagonal quasicrystals was used as a precursor alloy and transformed into the unique CoO/NiO/CoNi three dimension structure by a fancy one-step dealloying method. X-ray diffraction ( XRD) and scanning electron microscopy ( SEM) were used to examine the structure of the products. Electrochemical performance of as prepared CoO/NiO/CoNi was evaluated by galvanostatic cycling, the results show that the initial charge/discharge capacity is 417/617 mAh · g-1 at current density 200 mA·g-1 and the corresponding coulombic efficiency is about 67. 6%. A high capacity of 585 mAh·g-1 is obtained with the high capacity retention up to 500 cycles in the range 0. 01-3. 0 V, which indicates that the as prepared CoO/NiO/CoNi endowing good cycling performance.