High Performance Self-supported SnO2 Nanowires for Lithium Ion Battery Electrode

Title
High Performance Self-supported SnO2 Nanowires for Lithium Ion Battery Electrode
Authors
강진구고영대김동완박재관
Issue Date
2010-04
Publisher
MRS 2010
Abstract
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 [101] 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.
URI
http://pubs.kist.re.kr/handle/201004/37293
Appears in Collections:
KIST Publication > Conference Paper
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