期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 7, 页码 6093-6103出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b15516
关键词
sodium ion battery; Fe-doped TiO2; oxygen vacancies; rate performance; density functional theory calculations
资金
- National Nature Science Foundation of China [21671200, 21571189]
- Fundamental Research Funds for the Central Universities of Central South University [502200141]
- Hong Kong Scholar fund
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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