期刊
JOURNAL OF POWER SOURCES
卷 243, 期 -, 页码 891-898出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2013.06.080
关键词
Titanium dioxide; Vanadium; Semiconductor; Anode; Lithium ion battery
资金
- World Class University (WCU) program through the Korea Science and Engineering Foundation
- Ministry of Education, Science and Technology [R32-20074, 2009-0094055]
- Priority Research Centers Program through the National Research Foundation of Korea (NRF)
- National Research Foundation of Korea [2009-0094055] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Undoped and 2 wt% vanadium (V5+) doped TiO2 samples are prepared in polyol medium by lowtemperature solvothermal method. The as-prepared samples are annealed at 400 degrees C for 5 h in an air atmosphere to increase the crystallinity. The XRD pattern shows that pure anatase TiO2 is formed in both the doped and undoped samples. The maximum sizes of nanoparticles are found to be 300 nm and 15 nm with spherical shaped morphology for undoped TiO2 and V5+ doped TiO2 samples respectively. In addition, 2 wt% V5+ doped sample exhibits excellent electrochemical performance with high reversible specific capacity and excellent rate capability compared to the undoped case. This improvement can be attributed to the substitution of the Ti4+ ions by V5+ ions in the TiO2 lattice and create more Ti4+ vacancies in the lattice. This action may lead to the generation of apparently more number of free holes in the doped p-type semiconductor. Therefore, the increased hole concentration in the valence band can contribute to the electrical conductivity of the doped sample. Vanadium doping also influences the sample crystallinity and reduces the particle size, which provides a larger active surface area than that of undoped TiO2. (C) 2013 Elsevier B.V. All rights reserved.
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