期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 21, 期 34, 页码 12770-12776出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm12447a
关键词
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资金
- MOE (Singapore) [RG 31/08, MOE2010-T2-1-017, ARC 10/10, MOE2010-T2-1-060]
- A*STAR SERC [1021700144]
- Singapore MPA [23/04.15.03]
- NTU, Singapore [M58120031]
- [NRF2009EWT-RP001-026]
We report here a study on the Li ion storage performance of binary phased SnO2/rGO and ternary phased SnO2-Fe2O3/rGO composite nanostructures. The SnO2/rGO and SnO2-Fe2O3/rGO were prepared by a facile wet-chemical approach. The Li storage performances of these samples were closely related to the weight ratio of SnO2 : rGO or SnO2 : Fe2O3 : rGO. It was found that ternary SnO2-Fe2O3/rGO composite nanostructures (e. g. with a weight ratio of SnO2 : Fe2O3 : rGO = 11 : 1 : 13) showed significant enhancement of the specific capacities and cyclabilities as compared to that of SnO2/rGO samples. For example, the SnO2-Fe2O3/rGO electrode depicted a specific capacity of 958 mA h g(-1) at a current density of 395 mA g(-1) (0.5 C) during the 100(th) cycle. Such Li storage performances of the SnO2-Fe2O3/rGO electrodes, especially at high current densities (e.g. 530 mA h g(-1) at 5 C rate), were also much better than those reported for either SnO2-based or Fe2O3-based electrodes. Such a synergetic effect in the SnO2/Fe2O3/rGO composite nanostructures is promising for the development of advanced electrode materials for rechargeable Li-ion batteries.
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