Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 21, Issue 50, Pages 18309-18315Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201503266
Keywords
aluminum; fuel cells; lithium-ion batteries; oxygen; reduction; titanium
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Funding
- National Natural Science Foundation of China [11575085]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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An ultrafacile aluminum reduction method is reported herein for the preparation of blue TiO2 nanoparticles (donated as Al-TiO2, anatase phase) with abundant oxygen deficiency for lithium-ion batteries. Under aluminum reduction, the morphology of the TiO2 nanosheets changes from well-defined rectangular into uniform round or oval nanoparticles and the particle size also decreases from 60 to 31 nm, which can aggressively accelerate the lithium-ion diffusion. Electron paramagnetic resonance (EPR) and positron annihilation lifetime spectroscopy (PALS) results reveal that plentiful oxygen deficiencies relative to the Ti3+ species were generated in blue Al-TiO2; this effectively enhances the electron conductivity of the TiO2. X-ray photoelectron spectrometry (XPS) analysis indicates that a small peak is observed for the Al-O bond, which probably plays a very important role in the stabilization of the oxygen deficiencies/Ti3+ species. As a result, the blue Al-TiO2 possesses significantly higher capacity, better rate performance, and a longer cycle life than the white pure TiO2. Such improvements can be attributed to the decreased particle size, as well as the existence of the oxygen deficiencies/Ti3+ species.
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