Journal Article

PreJuSER-9424

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Lithium Storage in Amorphous TiO2 Nanoparticles

Borghols, W. J. H.FZJ* ; 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.

2010
Electrochemical Society Pennington, NJ

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Please use a persistent id in citations: doi:10.1149/1.3332806

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.

Keyword(s): J ; nanoparticles (auto) ; NMR spectroscopy (auto) ; secondary cells (auto) ; titanium compounds (auto) ; X-ray absorption spectra (auto)

Note: We thank HASYLAB for the provision of beam time and the financial support of our experiments and D. Zajac and D. Novikov for their excellent support at the beam lines. The financial support from the Netherlands Organization for Scientific Research (NWO) for the VIDI grant of M. W. is gratefully acknowledged. NWO is further acknowledged for financing the solid-state NMR facility for advanced material science at the Radboud University. We thank the Alistore network for providing access to TEM measurements and the electrochemical laboratories.

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Contributing Institute(s):

1. Streumethoden (IFF-4)
2. Neutronenstreuung (IFF-5)
3. JCNS (Jülich Centre for Neutron Science JCNS (JCNS) ; JCNS)

Research Program(s):

1. BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung (P45)
2. Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) (P55)

Appears in the scientific report 2010

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