材料科学
金红石
电化学
阳极
钠离子电池
插层(化学)
兴奋剂
钠
退火(玻璃)
化学工程
离子
无机化学
电极
复合材料
冶金
物理化学
光电子学
法拉第效率
化学
有机化学
工程类
作者
Hanna He,Dan Sun,Qi Zhang,Feng Fu,Yougen Tang,Jun Guo,Minhua Shao,Haiyan Wang
标识
DOI:10.1021/acsami.6b15516
摘要
Developing advanced anodes for sodium ion batteries is still challenging. In this work, Fe-doped three-dimensional (3D) cauliflower-like rutile TiO2 was successfully synthesized by a facile hydrolysis method followed by a low-temperature annealing process. The influence of Fe content on the structure, morphology, and electrochemical performance was systematically investigated. When utilized as a sodium ion battery anode, 6.99%-Fe-doped TiO2 exhibited the best electrochemical performance. This sample delivered a very high reversible capacity (327.1 mAh g-1 at 16.8 mA g-1) and superior rate performance (160.5 mAh g-1 at 840 mA g-1), as well as long-term cycling stability (no capacity fading at 1680 mA g-1 over 3000 cycles). Density functional theory (DFT) calculations combined with experimental results indicated that the significantly improved sodium storage ability of the Fe-doped sample should be mainly due to the increased oxygen vacancies, narrowed band gap, and lowered sodiation energy barrier, which enabled much higher electronic/ionic conductivities and more favorable sodium ion intercalation into rutile TiO2.
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