Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3299006
Keywords
energy storage; fuel cells; lithium compounds; nanowires; secondary cells
Categories
Funding
- Nano RD Program [2009-0082853]
- Basic Research Program [R012008-000-20702-0, R11-2008-105-01003-0]
- WCU [R31-2008-000-10059-0]
- MEST
- POSCO
- Converging Research Center [20090093743]
- MEST [20090072972]
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Nanowires can serve as three-dimensional platforms at the nanometer scale for highly efficient chemical energy storage and conversion vehicles, such as fuel cells and secondary batteries. Here we report a coin-type Si nanowire (NW) half-cell Li-ion battery showing the Li capacity of approximately 4000 mAh/g, which nearly approaches the theoretical limit of 4200 mAh/g, with very high Coulombic efficiency of up to 98%. Concomitantly, we provide direct evidence of reversible phase transitions in the Si NW anodes at the full electrochemical cycles, varying from pure Si to Li(22)Si(5) phase, which has been known empirically inaccessible in the bulk limit.
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