Physics – Condensed Matter – Materials Science
Scientific paper
2011-08-11
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.
Bai Peng
Bazant Martin Z.
Cogswell Daniel A.
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