反应时间对二氧化钛纳米管阵列的形成及脱嵌Li^+性能的影响

Effect of Reaction Time on Formation and Li^+ Intercalation/Extraction of TiO_2 Nanotube Arrays for Lithium Ion Battery

采用阳极氧化反应,在反应时间分别为0.5、1.0、2.0、3.0及4.0 h时制备了TiO_2纳米管阵列电极,并借助扫描电子显微镜、能量色散X射线光谱仪、恒流充/放电及循环伏安技术研究了反应时间对纳米管阵列的形成过程及脱/嵌Li^+性能的影响。结果表明:当反应时间为2.0 h时,三维有序TiO_2纳米管阵列完全形成,反应时间对TiO_2纳米管的管壁厚度、管径以及管长均有影响;作为锂离子电池负极活性材料时,放电比容量随反应时间的增加而增加。

TiO2 nanotube arrays were prepared via anodization for 0.5 h, 1.0 h, 2.0 h, 3.0 h and 4.0 h, respectively. The effect of anodization time on the formation and Li＋ intercalation/extraction of the as-prepared TiO2 nanotube arrays was investigated by scanning electron microscopy, energy dispersive spectrometry, X-ray diffractometer, galvanostatic charge/discharge and cyclic voltamrnetry. The results showed that TiO2 nanotube arrays completely formed at the anodization time of 2.0 h, and the wall thickness, the diameter and the length of TiO2 nanotubes were affected by the anodization time. As the anode active materials of lithium ion battery, the discharge capacity gradually increases with the increase of the anodization time.