Nanocrystalline Ti2/3Sn1/3O2 as anode material for Li-ion batteries |
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| Authors: | Ibrahim IssacMarco Scheuermann,Sebastian M. BeckerElisa Gil Bardají ,Christel AdelhelmDi Wang,Christian Kü belSylvio Indris |
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| Affiliation: | a Institute of Nanotechnology, Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany
b Institute of Applied Materials (IAM-AWP), Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany |
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| Abstract: | We prepared nanocrystalline Ti2/3Sn1/3O2 by a coprecipitation method starting from Ti(isopropoxide)4 and SnCl4·5H2O followed by calcination at 600 °C. TEM and XRD measurements reveal crystallite sizes of about 5 nm and a crystal structure equivalent to those of TiO2 rutile and SnO2 cassiterite. The local structure was investigated with 119Sn NMR and Sn Mössbauer spectroscopy. The material was cycled with C/20 at voltages between 3.0 and 0.02 V against Li metal. Specific capacities of 300 mAh g−1 were obtained for 100 cycles with voltage profiles very similar to those of pure SnO2. Faster cycling leads to strong decrease of the capacities but after returning to C/20 the initial values are obtained. |
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| Keywords: | Lithium-ion batteries Anode Titanium tin oxide |
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