Facile synthesis of iron-doped SnO2/reduced graphene oxide composite as high-performance anode material for lithium-ion batteries

By Wang, Junjie; Wang, Luyang; Zhang, Siyu; Liang, Shuiying; Liang, Xianqing; Huang, Haifu; Zhou, Wenzheng; Guo, Jin
Published in Journal of Alloys and Compounds 2018

Abstract

The iron-doped SnO2/reduced graphene oxide (Fe-SnO2/rGO) composite has been facilely synthesized through a simple wet chemical method. It is shown that the Fe-SnO2 nanocrystals (?8 nm) are homogeneously anchored onto rGO sheets with the content of 69.5 wt%. As the anode material for lithium-ion batteries, the as-prepared Fe-SnO2/rGO composite exhibits a reversible capacity of 1353 mAh g?1 after 100 cycles at 0.1 A g?1. Even at a high specific current of 1 A g?1, it still maintains a high reversible capacity of 691 mAh g?1, and a capacity of 1248 mAh g?1 can be delivered when the specific current returns back to 0.1 A g?1 after 50 cycles at different specific currents. The excellent electrochemical performance of Fe-SnO2/rGO composite can be attributed to the Fe doping, which can enhance the interfacial interaction between Fe-SnO2 nanocrystals and rGO sheets, improve the electrical conductivity of the composite and more importantly, facilitate the conversion reaction between Li2O and SnO2 during cycling.

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