Journal
ACS NANO
Volume 5, Issue 10, Pages 8108-8114Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn2027159
Keywords
carbon nanotube; graphene; lithium ion batteries; Sn; SnS(2)
Categories
Funding
- National Natural Science Foundation of China [50971085]
- Shanghai Municipal Government [09JC140-6100, S30109]
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Development of materials with carefully crafted nanostructures has been an important strategy for the next-generation lithium-Ion batteries to achieve higher capacity, longer cycle life, and better rate capability. Graphene-based and Sn-based anode materials are promising anodes with higher capacities than graphite; however, most of them exhibit fast capacity fading at prolonged cycling and poor rate capability. This paper reports a hierarchical Sn@CNT nanostructure rooted in graphene, which exhibits larger than theoretical reversible capacities of 1160-982 mAh/g in 100 cycles at 100 mA/g and excellent rate capability (828 mAh/g at 1000 mA/g and 594 mAh/g at 5000 mA/g). The excellent electrochemical performances compared to graphene/Sn-based anodes have been attributed to the efficient prevention of graphene agglomeration by Sn@CNT decoration and the increased electrochemical activities of Sn by CNT shell protection and GNS support.
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