Journal
NANO LETTERS
Volume 11, Issue 11, Pages 4890-4896Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl202764f
Keywords
Li-ion battery; LiFePO4; phase-field model; Butler-Volmer equation; spinodal decomposition; intercalation waves
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Funding
- National Science Foundation [DMS-0842504, DMS-0948071]
- MIT Energy Initiative
- Chinese Government [2009621147]
- Direct For Mathematical & Physical Scien [0854905] Funding Source: National Science Foundation
- Division Of Mathematical Sciences [0854905] Funding Source: National Science Foundation
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Using a novel electrochemical phase-field model, we question the common belief that LiXFePO4 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-LiFePO4 cathodes.
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