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High-rate anode materials for lithium-ion batteries are desirable for applications that require high power density. We demonstrate the advantageous rate capability of few-layered graphene nanosheets, with widths of 100–200 nm, over micro-scale graphene nanosheets. Possible reasons for the better performance of the former include their smaller size and better conductivity than the latter. Combination of SnO2 nanoparticles with graphene was used to further improve the gravimetric capacities of the electrode at high charge–discharge rates. Furthermore, the volumetric capacity of the composites was substantially enhanced compared to pristine graphene due to the higher density of the composites.


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Laterally Confined Graphene Nanosheets and Graphene/SnO2 Composites as High-Rate Anode Materials for Lithium-Ion Batteries

Show Author's information Zhiyong Wang1Hao Zhang2Nan Li1Zujin Shi1( )Zhennan Gu1Gaoping Cao2
Beijing National Laboratory for Molecular SciencesState Key Lab of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing100871China
Research Institute of Chemical DefenseWest Building35 Huayuanbei RoadBeijing100083China

Abstract

High-rate anode materials for lithium-ion batteries are desirable for applications that require high power density. We demonstrate the advantageous rate capability of few-layered graphene nanosheets, with widths of 100–200 nm, over micro-scale graphene nanosheets. Possible reasons for the better performance of the former include their smaller size and better conductivity than the latter. Combination of SnO2 nanoparticles with graphene was used to further improve the gravimetric capacities of the electrode at high charge–discharge rates. Furthermore, the volumetric capacity of the composites was substantially enhanced compared to pristine graphene due to the higher density of the composites.

Keywords: Carbon, graphene, nanomaterials, anode, lithium-ion batteries, SnO2

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Publication history

Received: 09 June 2010
Revised: 01 September 2010
Accepted: 02 September 2010
Published: 21 September 2010
Issue date: October 2010

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© The Author(s) 2010

Acknowledgements

Acknowledgements

The authors gratefully acknowledge the National Natural Science Foundation of China (Nos. 90206048 and 20371004) and the Ministry of Science and Technology of China (Grant Nos. 2006CB932701 and 2007AA03Z311) for financial support.

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