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126447 |
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|a Cogswell, Daniel Aaron
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|a Massachusetts Institute of Technology. Department of Chemical Engineering
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|a Massachusetts Institute of Technology. Department of Mathematics
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|a Bazant, Martin Z
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|a Size-dependent phase morphologies in LiFePO4 battery particles
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|b Elsevier BV,
|c 2020-07-30T02:47:12Z.
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|z Get fulltext
|u https://hdl.handle.net/1721.1/126447
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|a 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.
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|a Article
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|t Electrochemistry Communications
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