Suppression of Phase Separation in LiFePO 4 Nanoparticles During Battery Discharge

Author(s)
Bai, Peng; Cogswell, Daniel A.
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Abstract
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.
Date issued
2011-10
URI
http://hdl.handle.net/1721.1/77987
Department
Massachusetts Institute of Technology. Department of Chemical Engineering; Massachusetts Institute of Technology. Department of Mathematics
Journal
Nano Letters
Publisher
American Chemical Society
Citation
Bai, Peng, Daniel A. Cogswell, and Martin Z. Bazant. “Suppression of Phase Separation in LiFePO₄ Nanoparticles During Battery Discharge.” Nano Letters 11.11 (2011): 4890–4896. CrossRef. Web.
Version: Author's final manuscript
ISSN
1530-6984
1530-6992
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