| Autor: |
Bai P; Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States., Cogswell DA, Bazant MZ |
| Jazyk: |
angličtina |
| Zdroj: |
Nano letters [Nano Lett] 2011 Nov 09; Vol. 11 (11), pp. 4890-6. Date of Electronic Publication: 2011 Oct 20. |
| DOI: |
10.1021/nl202764f |
| Abstrakt: |
Using a novel electrochemical phase-field model, we question the common belief that Li(X)FePO(4) nanoparticles always separate into Li-rich and Li-poor phases during battery discharge. For small currents, spinodal decomposition or nucleation leads to moving phase boundaries. Above a critical current density (in the Tafel regime), the spinodal disappears, and particles fill homogeneously, which may explain the superior rate capability and long cycle life of nano-LiFePO(4) cathodes. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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