| 基于铜基底的TiO2纳米管阵列储锂性能 |
| Lithium Storage Performances of TiO2 Nanotube Arrays on Copper Substrate |
| 作者 | 单位 | E-mail | | 陈公德 | 合肥工业大学化工学院, 可控化学与材料化工安徽省重点实验室, 合肥 230009 | | | 张卫新 | 合肥工业大学化工学院, 可控化学与材料化工安徽省重点实验室, 合肥 230009 | wxzhang@hfut.edu.cn | | 杨则恒 | 合肥工业大学化工学院, 可控化学与材料化工安徽省重点实验室, 合肥 230009 | | | 王强 | 合肥工业大学化工学院, 可控化学与材料化工安徽省重点实验室, 合肥 230009 | | | 姚宏旭 | 合肥工业大学化工学院, 可控化学与材料化工安徽省重点实验室, 合肥 230009 | |
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| 摘要: 研究了基于铜基底的TiO2纳米管阵列直接作为锂离子电池电极的储锂性能。以铜基底上生长的Cu(OH)2纳米棒阵列为模板,采用自牺牲模板法,通过外向包覆与内向刻蚀,制备了非晶态的TiO2纳米管阵列,然后将其在500 ℃下退火处理4 h,获得锐钛矿型TiO2纳米管阵列。采用X射线衍射、场发射扫描电镜、透射电镜、热重分析对样品进行表征;采用恒电流充放电、循环伏安和交流阻抗谱测试对退火前后TiO2纳米管阵列的电化学性能进行研究。结果表明:与非晶态的TiO2纳米管阵列相比,锐钛矿型TiO2纳米管阵列吸附水的含量低,结晶度高,电荷迁移阻力小,锂离子扩散系数大,结构稳定,具有更好的循环性能和倍率性能;在0.2C下,其首次放电比容量为353 mAh·g-1,经过40次循环后的放电比容量仍为243 mAh·g-1,在8C下的放电比容量为90 mAh·g-1。 |
| 关键词: TiO2 纳米管阵列 模板 负极 锂离子电池 |
| 基金项目: 国家自然科学基金(No.21271058, 21176054, 20871038);安徽省教育厅创新团队项目(TD200702)资助项目。 |
| Abstract: Lithium storage performances of TiO2 nanotube arrays on copper substrate as electrodes in lithium-ion batteries were investigated. Amorphous TiO2 nanotube arrays were prepared via a sacrificial template method from outward coating of TiO2 and inward etching of Cu(OH)2 nanorod array templates on copper substrate. Anatase TiO2 nanotube arrays were obtained by post-heating the sample at 500 ℃ for 4 h. The samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The electrochemical performances of amorphous and anatase TiO2 nanotube arrays were investigated by galvanostatic charge-discharge measurements, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The results indicate that compared with amorphous TiO2 nanotube arrays, anatase TiO2 nanotube arrays exhibit a superior rate capability and cycling performance due to their lower amounts of adsorbed water, higher crystallization, lower charge-transfer resistance, higher lithium-ion diffusion coefficient, and more stable one-dimensional tubular structure. They show an initial specific discharge capacity of 353 mAh·g-1 and 243 mAh·g-1 even after 40 cycles at 0.2C. At a high rate of 8C, their discharge capacity can reach 90 mAh·g-1. |
| Keywords: TiO2 nanotube arrays templates anode lithium-ion batteries |
| 投稿时间：2013-02-26 修订日期：2013-06-10 |
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| 陈公德,张卫新,杨则恒,王强,姚宏旭.基于铜基底的TiO2纳米管阵列储锂性能[J].无机化学学报,2013,29(8):1759-1768. |
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