Two-dimensional lithium diffusion behavior and probable hybrid phase transformation kinetics in olivine lithium iron phosphate
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Hong_et_al-2017-Nature_Communications.pdf
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Author(s)
Hong, Liang
Li, Linsen
Chen-Wiegart, Yuchen-Karen
Wang, Jiajun
Xiang, Kai
Gan, Liyang
Li, Wenjie
Meng, Fei
Wang, Fan
Wang, Jun
Date Issued
October 2017
Journal
Nature Communications
Publisher
Nature Publishing Group
Citation
Hong, Liang et al. “Two-Dimensional Lithium Diffusion Behavior and Probable Hybrid Phase Transformation Kinetics in Olivine Lithium Iron Phosphate.” Nature Communications 8, 1 (October 2017): 1194 © 2017 The Author(s)
Version
Final published version
Abstract
Olivine lithium iron phosphate is a technologically important electrode material for lithium-ion batteries and a model system for studying electrochemically driven phase transformations. Despite extensive studies, many aspects of the phase transformation and lithium transport in this material are still not well understood. Here we combine operando hard X-ray spectroscopic imaging and phase-field modeling to elucidate the delithiation dynamics of single-crystal lithium iron phosphate microrods with long-axis along the [010] direction. Lithium diffusivity is found to be two-dimensional in microsized particles containing ∼3% lithium-iron anti-site defects. Our study provides direct evidence for the previously predicted surface reaction-limited phase-boundary migration mechanism and the potential operation of a hybrid mode of phase growth, in which phase-boundary movement is controlled by surface reaction or lithium diffusion in different crystallographic directions. These findings uncover the rich phase-transformation behaviors in lithium iron phosphate and intercalation compounds in general and can help guide the design of better electrodes.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution 4.0 International
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DOI of Published Version
https://doi.org/10.1038/s41467-017-01315-8
