High Performance Self-supported SnO2 Nanowires for Lithium Ion Battery Electrode
- High Performance Self-supported SnO2 Nanowires for Lithium Ion Battery Electrode
- 강진구; 고영대; 김동완; 박재관
- Issue Date
- MRS 2010
- Herein, we report on the realization of self-supported SnO2 nanowires electrode with high theoretical capacity (~780 mAh/g) induced by alloying/dealloying lithium storage mechanism which differs from classical insertion/deinsertion reaction. The SnO2 nanowires were directly grown on the current collector (stainless steel substrate) without buffer layers by tip-led vapor-liquid-solid growth mechanism via thermal evaporation method. It was revealed that the diameter of nanowires ranged from 40 to 50 nm, and nanowires evolved along  preferential direction. Galvanostatic electrochemical measurements were performed to characterize the lithium storage properties of self-supported SnO2 nanowires electrode. It demonstrated stable cycling manner and high specific capacity of 510 mAh/g even at 50th cycle at a rate of 1C, which surpassed that of SnO2 nanopowder and Sn nanopowder electrodes. Furthermore, SnO2 nanowire electrode exhibited excellent rate capabilities, with rechargeable storage capacities of 600 mAh/g at 3C, 530 mAh/g at 5C, and 440 mAh/g at 10C. Our results hold a promise of fabricating novel nanostructured electrodes for high power lithium ion battery.
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