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Title: Miscibility Gap Closure, Interface Morphology, and Phase Microstructure of 3D LixFePO 4 Nanoparticles from Surface Wetting and Coherency Strain

Journal Article · · ACS Nano
 [1];  [2];  [3];  [4]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  2. Univ. of Chicago, IL (United States). Computation Inst.
  3. Northwestern Univ., Evanston, IL (United States). McCormick School of Engineering
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Univ. of Chicago, IL (United States). Computation Inst.

We study the mesoscopic effects which suppress phase-segregation in LixFePO4 nanoparticles using a multiphysics phase-field model implement on a high performance cluster. We simulate 3D spherical particles of radii from 3nm to 40nm and examine the equilibrium microstructure and voltage profiles as a they depend on size and overall lithiation. The model includes anisotropic, concentration-dependent elastic moduli, misfit strain, and facet dependent surface wetting within a Cahn-Hilliard formulation. Here, we find that the miscibility gap vanishes for particles of radius ~ 5 nm, and the solubility limits change with overall particle lithiation. The corresponding voltage plateau, indicative of phase-segregation, changes in extent and also vanishes. Surface wetting is found to have a strong effect on stabilizing a variety of microstructures, exaggerating the shifting of solubility limits, and shortening the voltage plateau.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); US Department of Commerce
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1237941
Journal Information:
ACS Nano, Vol. 9, Issue 10; ISSN 1936-0851
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 50 works
Citation information provided by
Web of Science

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A phase-field study of the effect of local deformation velocity on lithiation-induced stress in wire-like structures journal February 2019
Phase Field Modeling of Coupled Phase Separation and Diffusion-Induced Stress in Lithium Iron Phosphate Particles Reconstructed From Synchrotron Nano X-ray Tomography journal April 2019
Three-dimensional localization of nanoscale battery reactions using soft X-ray tomography journal March 2018
Multiphase Porous Electrode Theory journal January 2017
Toward Optimal Performance and In-Depth Understanding of Spinel Li 4 Ti 5 O 12 Electrodes through Phase Field Modeling journal February 2018
Phase-field study of surface irregularities of a cathode particle during intercalation journal August 2018
An Extended Formulation of Butler-Volmer Electrochemical Reaction Kinetics Including the Influence of Mechanics journal January 2019
Phase transformation and fracture in single Li x FePO 4 cathode particles: a phase-field approach to Li–ion intercalation and fracture journal March 2016
Three-dimensional localization of nanoscale battery reactions using soft X-ray tomography. text January 2018