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Size-dependent phase morphologies in LiFePO4 battery particles

Author(s)
Cogswell, Daniel Aaron; Bazant, Martin Z
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Abstract
Lithium iron phosphate (LiFePO4) is the prototypical two-phase battery material whose complex patterns of lithium ion intercalation provide a testing ground for theories of electrochemical thermodynamics. Using a depth-averaged (a-b plane) phase-field model of coherent phase separation driven by Faradaic reactions, we reconcile conflicting experimental observations of diamond-like phase patterns in micron-sized platelets with observations of surface-controlled patterns in nanoparticles. Elastic analysis predicts this morphological transition for particles whose a-axis dimension exceeds twice the bulk elastic stripe period. We also simulate a rich variety of non-equilibrium patterns, influenced by size-dependent spinodal points and electro-autocatalytic control of thermodynamic stability.
Date issued
2018-10
URI
https://hdl.handle.net/1721.1/126447
Department
Massachusetts Institute of Technology. Department of Chemical Engineering; Massachusetts Institute of Technology. Department of Mathematics
Journal
Electrochemistry Communications
Publisher
Elsevier BV
Citation
Cogswell, Daniel A. and Martin Z. Bazant. "Size-dependent phase morphologies in LiFePO4 battery particles." Electrochemistry Communications 95 (October 2018): 33-37 © 2018 Elsevier B.V.
Version: Original manuscript
ISSN
1388-2481

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