| TiO2纳米管阵列制备及其电化学嵌锂性能研究 |
| Preparation and Electrochemical Lithium Insertion of TiO2 Nanotube Arrays |
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| 摘要: 本文研究了TiO2纳米管阵列制备及其嵌锂电化学性能。采用阳极氧化法制备了TiO2纳米管阵列。利用XRD、SEM、恒电流充放电、CV、EIS等手段，对所制备TiO2纳米管阵列的结构、形貌进行了分析表征及电化学性能测试。实验结果表明，制备出的TiO2纳米管阵列薄膜具有很好的循环性能，首次嵌锂容量达73.3 μAh·cm-2，100次循环后容量仍维持在65.5 μAh·cm-2，容量保持率为89.4%，库仑效率达95%以上；锂离子在TiO2纳米管阵列中的扩散系数为7.7×10-9 cm2·s-1，嵌锂表观活化能为58.4 kJ·mol-1。 |
| 关键词: TiO2纳米管阵列 阳极氧化 锂离子电池 负极材料 扩散 |
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| Abstract: This paper reports on the preparation of TiO2 nanotube arrays and their electrochemical lithium insertion properties. Anodization method is used to prepare self-organized TiO2 nanotube arrays. The crystal structure, morphologies, and electrochemical properties of the as-prepared TiO2 nanotube arrays are characterized by X-ray diffraction (XRD), sanning electron microscopy (SEM), galvanostatic change/discharge, cyclic voltammetric (CV), and electrochemical impedance spectra (EIS). The results show that the TiO2 nanotube arrays exhibit good cycle performance, delivering an initial discharge capacity of 73.3 μAh·cm-2 and 65.5 μAh·cm-2 after 100 cycles (with the retention of 89.4%). The diffusion coefficient and apparent activation energies of lithium insertion in the TiO2 nanotube arrays are calculated to be 7.7×10-9 cm2·s-1 and 58.4 kJ·mol-1, respectively. |
| Keywords: TiO2 nanotube arrays anodization Li-ion batteries anode materials diffusion |
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| 刘蓉芳,程方益,陶占良,陈 军.TiO2纳米管阵列制备及其电化学嵌锂性能研究[J].无机化学学报,2011,27(6):1021-1026. |
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