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Nano Lett. 2011 Nov 9;11(11):4890-6. doi: 10.1021/nl202764f. Epub 2011 Oct 20.

Suppression of phase separation in LiFePO₄ nanoparticles during battery discharge.

Author information

1
Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.

Abstract

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.

PMID:
21985573
DOI:
10.1021/nl202764f
[Indexed for MEDLINE]

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