Face-Centered-Cubic Lithium Crystals Formed in Mesopores of Carbon Nanofiber Electrodes

Title
Face-Centered-Cubic Lithium Crystals Formed in Mesopores of Carbon Nanofiber Electrodes
Authors
이병순서종현손승범Seul Cham Kim최인석안재평오규환이세히Woong-Ryeol Yu
Keywords
hollow carbon nanofibers; flexible Li-ion battery; freestanding electrode; irreversible capacity; Li FCC crystal
Issue Date
2013-07
Publisher
ACS Nano
Citation
VOL 7, NO 7, 5801-5807
Abstract
In the foreseeable future, there will be a sharp increase in the demand for flexible Li-ion batteries. One of the most important components of such batteries will be a freestanding electrode, because the traditional electrodes are easily damaged by repeated deformations. The mechanical sustainability of carbon-based freestanding electrodes subjected to repeated electrochemical reactions with Li ions is investigated via nanotensile tests of individual hollow carbon nanofibers (HCNFs). Surprisingly, the mechanical properties of such electrodes are improved by repeated electrochemical reactions with Li ions, which is contrary to the conventional wisdom that the mechanical sustainability of carbon-based electrodes should be degraded by repeated electrochemical reactions. Microscopic studies reveal a reinforcing mechanism behind this improvement, namely, that inserted Li ions form irreversible face-centered-cubic (FCC) crystals within HCNF cavities, which can reinforce the carbonaceous matrix as strong second-phase particles. These FCC Li crystals formed within the carbon matrix create tremendous potential for HCNFs as freestanding electrodes for flexible batteries, but they also contribute to the irreversible (and thus low) capacity of HCNFs.
URI
http://pubs.kist.re.kr/handle/201004/46725
ISSN
19360851
Appears in Collections:
KIST Publication > Article
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