Back to Search
Start Over
Face-centered-cubic lithium crystals formed in mesopores of carbon nanofiber electrodes.
- Source :
-
ACS nano [ACS Nano] 2013 Jul 23; Vol. 7 (7), pp. 5801-7. Date of Electronic Publication: 2013 Jun 13. - Publication Year :
- 2013
-
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.
- Subjects :
- Crystallization methods
Electric Conductivity
Equipment Design
Equipment Failure Analysis
Macromolecular Substances chemistry
Materials Testing
Molecular Conformation
Particle Size
Porosity
Surface Properties
Carbon chemistry
Electrodes
Lithium chemistry
Nanofibers chemistry
Nanofibers ultrastructure
Subjects
Details
- Language :
- English
- ISSN :
- 1936-086X
- Volume :
- 7
- Issue :
- 7
- Database :
- MEDLINE
- Journal :
- ACS nano
- Publication Type :
- Academic Journal
- Accession number :
- 23730918
- Full Text :
- https://doi.org/10.1021/nn4019625