| 离子交换法合成纳米级锂离子电池负极材料Li4Ti5O12 |
| Preparation of Nanosized Li4Ti5O12 as Anode Material for Lithium-Ion Batteries via Ion-Exchange Method |
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| 摘要: 用钛酸纳米管和LiOH溶液进行离子交换法得到了水合钛酸锂前驱体，进而在不同温度热处理制备了Li4Ti5O12。通过X射线衍射(XRD)、扫描电镜(SEM)、热分析(TG-DSC)和恒电流充放电测试对反应产物进行了研究。结果表明所得前驱体在500~700 ℃热处理可得到纳米结构的纯相Li4Ti5O12。所得Li4Ti5O12的可逆容量约为160 mAh·g-1，循环稳定性随热处理温度的提高而增强，并因具有较短的锂离子扩散距离表现出极佳的倍率性能，在1600 mA·g-1(约10C)的电流密度下放电下还保持140 mAh· g-1的容量。 |
| 关键词: 离子交换法 Li4Ti5O12 锂离子电池 倍率性能 |
| 基金项目: |
| Abstract: Li4Ti5O12 was prepared by calcination of the hydrated lithium titanate, which was synthesized from ion-exchange reaction of titanate nanotubes in aqueous LiOH. The obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermal analysis (TG-DSC) and galvanostatic charge/discharge test. The result shows that pure-phase nanosized Li4Ti5O12 can be obtained by heating the precursor between 500~700 ℃. The reversible capacity of the obtained Li4Ti5O12 is about 160 mAh·g-1，and its cycling stability is improved with increased calcination temperature. It is also demonstrated that the Li4Ti5O12 have excellent high rate discharge capability due to the short diffusion distances. A capacity of 140 mAh·g-1 is obtained at a high discharge current density of 1 600 mA·g-1 (about 10C). |
| Keywords: ion-exchange method Li4Ti5O12 lithium-ion battery rate capability |
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| 张 欢,其 鲁,高学平,杨 坤,张 鼎.离子交换法合成纳米级锂离子电池负极材料Li4Ti5O12[J].无机化学学报,2010,26(9):1539-1543. |
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