Suppression of Phase Separation in LiFePO4 Nanoparticles During Battery Discharge

Details Suppression of Phase Separation in LiFePO4 Nanoparticles During Battery Discharge Suppression of Phase Separation in LiFePO4 Nanoparticles During Battery Discharge

2011-08-11

arxiv.org/abs/1108.2326v1

Physics

Condensed Matter

Materials Science

27 pages, 8 figures

Scientific paper

10.1021/nl202764f

Using a novel electrochemical phase-field model, we question the common belief that LixFePO4 nanoparticles 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-LiFePO4 cathodes.

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