Suppression of phase separation in LiFePO₄ nanoparticles during battery discharge.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 21985573.
- Also identified by DOI 10.1021/nl202764f.
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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.
Medical subject headings
- Electric Power Supplies
- Electrodes
- Ferrous Compounds
- Lithium
- Models, Chemical
- Nanoparticles
- Phosphates