We report a simple glucose-mediated hydrothermal method for gram-scale synthesis of nearly monodisperse hybrid SnO 2 nanoparticles. Glucose is found to play the dual role of facilitating rapid precipitation of polycrystalline SnO 2 nanocolloids and in creating a uniform, glucose-derived, carbon-rich polysaccharide (GCP) coating on the SnO 2 nanocores. The thickness of the GCP coating can be facilely manipulated by varying glucose concentration in the synthesis medium. Carbon-coated SnO 2 nanocolloids obtained after carbonization of the GCP coating exhibit significantly enhanced cycling performance for lithium storage. Specifically, we find that a capacity of ca. 440 mA h/g can be obtained after more than 100 charge/discharge cycles at a current density of 300 mA/g in hybrid SnO 2-carbon electrodes containing as much as 1/3 of their mass in the low-activity carbon shell. By reducing the SnO 2-carbon particles with H 2, we demonstrate a simple route to carbon-coated Sn nanospheres. Lithium storage properties of the latter materials are also reported. Our results suggest that large initial irreversible losses in these materials are caused not only by the initial, presumably irreversible, reduction of SnO 2 as generally perceived in the field, but also by the formation of the solid electrolyte interface (SEI). © 2009 American Chemical Society.
|Original language||English (US)|
|Number of pages||7|
|Journal||Chemistry of Materials|
|State||Published - Jul 14 2009|
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUS-C1-018-02
Acknowledgements: The authors are grateful to the National Science Foundation (DMR0404278) and for Award KUS-C1-018-02 made by King Abdullah University of Science and Technology (KAUST) for partial support of this study. Facilities available through the Cornell Center for Materials Research (CCMR) and Cornell Integrated Microscopy Center (CIMC) were also used in this work.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.