Last modified: 2014-10-11
Abstract
Abstract
With the excellent electronic conductivity and high specific surface of the graphene sheets, the SnO2/graphene nanocomposite (term as SGC) has been successfully fabricated through a facile hydrothermal process with the SnO2 nanoparticles homogeneously dispersed on the graphene sheets. The graphene sheets in the composite have provided a conductive network for the SnO2 nanoparticles and reduce the total impendence of the electrode. The results show that SGC has smaller electrochemical resistance (60Ω) than that of the pure SnO2 nanoparticles electrode (80Ω). The initial capacity of SGC is 2063 mAh/g at the rate of 0.1C, and after 20 cycles the reversible capacity still maintain as high as 589mAh/g, relatively the pure SnO2 displays 422mAh/g. The adding of graphene can significantly improve the cyclic reversible capacity of the SnO2, and to large extent, overcomes the drawbacks, such as huge irreversible capacity, large impendence, serious volume expansion during cycling, and poor stability, of SnO2 as anode material.
Keywords
References
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