Print Email Facebook Twitter Lithium Storage in Amorphous TiO2 Nanoparticles Title Lithium Storage in Amorphous TiO2 Nanoparticles Author Borghols, W.J.H. Lützenkirchen-Hecht, D. Haake, U. Chan, W. Lafont, U. Kelder, E.M. Van Eck, E.R.H. Kentgens, A.P.M. Mulder, F.M. Wagemaker, M. Faculty Applied Sciences Date 2010-04-07 Abstract Amorphous titanium oxide nanoparticles were prepared from titanium isopropoxide. In situ measurements reveal an extraordinary high capacity of 810 mAh/g on the first discharge. Upon cycling at a charge/discharge rate of 33.5 mA/g, this capacity gradually decreases to 200 mAh/g after 50 cycles. The origin of this fading was investigated using X-ray absorption spectroscopy and solid-state nuclear magnetic resonance. These measurements reveal that a large fraction of the total amount of the consumed Li atoms is due to the reaction of H2O/OH species adsorbed at the surface to Li2O, explaining the irreversible capacity loss. The reversible capacity of the bulk, leading to the Li0.5TiO2 composition, does not explain the relatively large reversible capacity, implying that part of Li2O at the TiO2 surface may be reversible. The high reversible capacity, also at large (dis)charge rates up to 3.35 A/g (10C), makes this amorphous titanium oxide material suitable as a low cost electrode material in a high power battery. Subject nanoparticlesNMR spectroscopysecondary cellstitanium compoundsX-ray absorption spectra To reference this document use: http://resolver.tudelft.nl/uuid:4e038105-a11a-46f4-8079-35b3b115aaba DOI https://doi.org/10.1149/1.3332806 Publisher The Electrochemical Society ISSN 0013-4651 Source https://doi.org/10.1149/1.3332806 Source Journal of the Electrochemical Society, 157 (5), 2010 Part of collection Institutional Repository Document type journal article Rights © 2010 The Author(s)The Electrochemical Society Files PDF Borghols_2010.pdf 312.71 KB Close viewer /islandora/object/uuid:4e038105-a11a-46f4-8079-35b3b115aaba/datastream/OBJ/view