Abstract
Electrochemical processes in high-energy electrode materials often involve diffusion of multiple species and solid-state phase transformations. Some of these phase transformations involve breaking and rearranging ionic bonds and are referred to as conversion reactions (e.g., the lithium and iron difluoride conversion reaction: 2Li+ + 2e− + FeF2 → 2LiF + Fe). The phase transformations during conversion processes are governed by fundamental thermodynamics and kinetics in a similar manner to metallurgical systems. In this work, we developed a phase-field model that tracks atomic fractions of three constituent species to simulate the morphological evolution of different phases. The simulations demonstrate that conversion proceeds via a two-stage process consisting of lithiation and decomposition stages, whereas the reconversion process consists of a single-stage delithiation. This asymmetry in evolution paths of conversion and reconversion is likely responsible for the voltage hysteresis commonly observed during lithiation-delithiation cycling of conversion materials.
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Acknowledgment
This work is supported by the NorthEast Center for Chemical Energy Storage, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award Numbers DE-SC0001294 and DE-SC0012583. Computational resources were provided by the Extreme Science and Engineering Discovery Environment (XSEDE) (Allocation No. TG-DMR110007), which is supported by National Science Foundation Grant Number OCI-1053575, and also provided by the University of Michigan Advanced Research Computing.
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Yu, HC., Wang, F., Amatucci, G.G. et al. A Phase-Field Model and Simulation of Kinetically Asymmetric Ternary Conversion-Reconversion Transformation in Battery Electrodes. J. Phase Equilib. Diffus. 37, 86–99 (2016). https://doi.org/10.1007/s11669-015-0440-0
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DOI: https://doi.org/10.1007/s11669-015-0440-0