| 纳米核壳二氧化钛的可控制备及储锂性能研究 |
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| 引用本文： | 程 贺,郭 冰. 纳米核壳二氧化钛的可控制备及储锂性能研究[J]. 无机盐工业, 2016, 48(1): 68 |
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| 作者姓名： | 程 贺 郭 冰 |
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| 作者单位： | 合肥工业大学化学与化工学院，安徽合肥 230009 |
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| 摘 要： | 以氟钛酸铵为钛源，采用尿素和双氧水控制Ti4+水解速率，经过一步水热，制备出了锐钛矿型的二氧化钛核壳纳米结构，500 ℃煅烧处理得到电极材料。采用X射线衍射（XRD）、场发射扫描电镜（FESEM）、恒流充放电及循环伏安测试对材料的结构、形貌和电化学性能进行表征。结果表明产物形貌尺寸均一，分散性较好。与市售二氧化钛纳米颗粒相比，二氧化钛核壳纳米结构具有多孔结构及优异的结构稳定性，从而具有更好的循环性能和倍率性能。在0.1C倍率下，二氧化钛核壳纳米结构放电比容量为344 mA·h/g，当放电倍率提高到10C时，仍然具有72 mA·h/g的放电比容量。在1C的放电倍率下，经过100次循环，二氧化钛核壳纳米结构放电容量保持率为80%。
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| 关 键 词： | 锂离子电池 TiO2 电化学性能 |
Controllable synthesis of TiO2 core-shell nanostructure and lithium storage performance thereof |
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| CHENG He,Guo- Bing. Controllable synthesis of TiO2 core-shell nanostructure and lithium storage performance thereof[J]. Inorganic Chemicals Industry, 2016, 48(1): 68 |
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| Authors: | CHENG He Guo- Bing |
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| Affiliation: | School of Chemistry and Chemical Engineering，Hefei University of Technology，Hefei 230009，China |
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| Abstract: | TiO2 core-shell nanostructures have been hydrothermally prepared through controlling hydrolysis rate of Ti4+ ions by urea and H2O2 in（NH4）2TiF6 aqueous solution.Electrode materials were obtained by post-heating at 500 ℃.The structure， morphology，and electrochemical performance prepared materials were characterized by XRD，FESEM，and galvanostatic charge-discharge measurements and cyclic voltammetry.Result indicated that the products had well-defined morphologies，uniform sizes，and good dispersion.In comparison with commercial TiO2 nanoparticles，core-shell structures had unique porous structures and excellent structural stability，thus exhibiting a superior cycle performance and rate capability.TiO2 core-shell nanostructures can deliver a discharge capacity of 344 mA·h/g and 72 mA·h/g at 0.1C and 10C rates，respectively. Moreover，TiO2 core-shell nanostructures delivered a high retained capacity about 80% at 1C after 100 cycles. |
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| Keywords: | lithium ion batteries TiO2 electrochemical performance |
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