Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 113, Issue 32, Pages 14213-14219Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp904209k
Keywords
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Funding
- National Natural Science Foundation of China [50730005, 20701038]
- Ministry of Science and Technology [2006CB806100, 2009CB930400]
- Chinese Academy of Sciences
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Hierarchical flower-like SnO2 nanomicrostructure has been synthesized via a solvent-induced and surfactant assisted self-assembly technique at ambient temperature followed by a suitable thermal treatment. A possible growth mechanism governing the formation of such a nanomicrostructure is discussed. The applications in gas sensors for detecting CO and H-2 reveal that the obtained SnO2 material exhibits a remarkable sensitivity and extremely low detecting limit (5 ppm), as well as good reproducibility and short response/recovery times, which benefit a lot from its unique flower-like nanomicrostructure consisting of three-dimensional interconnected SnO2 nanoparticles and nanopores. In order to use the present SnO2 nanomicrostructure in lithium-ion batteries, carbon coatings are introduced to the surface of them by pyrolysis of glucose under hydrothermal conditions. Both SnO2-C and Sn-C nanocomposites are obtained by taking thermal treatment of the precursors at different temperatures. The conversion processes are investigated by thermogravimetrics (TG) analyses under N-2 and air atmosphere. All three Sn-based nanostructures are investigated with XRD, SEM, TEM, and electrochemical tests toward lithium storage. It is found that the SnO2-C composite shows a very high reversible capacity (similar to 700 mA h g(-1) after 20 cycles) and high Coulombic efficiency in the initial few cycles, as well as significantly enhanced cycling performance compared with bare SnO2 nanostructure and Sn-C nanocomposite, exhibiting great potential as an anode material in lithium-ion batteries. The improvements can be attributed to the outside carbon coating layer as well as the in situ formed buffer, Li2O matrix, upon initial Li uptake.
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