Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 23, Issue 21, Pages 5059-5065Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201605115
Keywords
conducting materials; lithium-ion batteries; mesocrystals; rutile; TiO2
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Funding
- National Natural Science Foundation of China [NSFC U1505241]
- Research Fund for the Doctoral Program of Higher Education of China [RFDP 20133514110002]
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A homogeneous Nb-doped rutile TiO2 mesocrystal material was synthesized successfully through a facile hydrothermal route. The incorporation of Nb5+ not only promotes the crystallization of the building subunits of the rutile TiO2 mesocrystal, but also improves the electrochemical performance at higher current rates. A capacity of 96.3mAhg(-1) at a current density as high as 40C and an excellent long-term cycling stability with a capacity loss of approximately 0.006% per cycle at 5C could be achieved when an appropriate amount of Nb5+ was doped into rutile TiO2 mesocrystal. The reasons for the improvement of rate capability may be attributed to the enhancement of electronic conductivity, Li-ion diffusion kinetics, and the surface storage property for the Nb-doped rutile TiO2 mesocrystal.
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