Hierarchical SnO2 with double carbon coating composites as anode materials for lithium ion batteries |
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Authors: | Bin Huang Juan Yang Xiangyang Zhou |
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Affiliation: | 1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China
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Abstract: | Hierarchical SnO2 with double carbon coating (polypyrrole-derived carbon and reduced graphene oxide in order) composites have been successfully synthesized as anode materials for lithium ion batteries. The composites were characterized and examined by X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, cyclic voltammetry, and galvanostatic discharge/charge tests. Such a novel nanostructure can not only provide a high conductivity but also prevent aggregation of SnO2 nanoparticles, leading to the improvement of the cycling performance. Comparing with pure hierarchical SnO2 and polypyrrole-derived carbon-coated hierarchical SnO2, hierarchical SnO2 with double carbon coating composite exhibits higher lithium storage capacities and better cycling performance, 554.8 mAh g?1 after 50 cycles at a current density of 250 mA g?1. In addition, the rate performance of hierarchical SnO2 with double carbon coating composite is also very well. For all the improved performances, this double carbon coating architecture may provide some references for other electrode materials of lithium ion batteries. |
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