Three-dimensional phase evolution and stress-induced non-uniform Li intercalation behavior in lithium iron phosphate

Yang, Kaiqi; Tang, Ming

doi:10.1039/c9ta11697d

Title: Three-dimensional phase evolution and stress-induced non-uniform Li intercalation behavior in lithium iron phosphate

Journal Article · 19 December 2019 · Journal of Materials Chemistry. A

DOI: https://doi.org/10.1039/c9ta11697d · OSTI ID:1803560

Yang, Kaiqi ^[1];

^[2]

Rice University, Houston, TX (United States); OSTI
Rice University, Houston, TX (United States)

A lithium iron phosphate (LiFePO₄) olivine cathode displays rich phase transition behavior during charging/discharging. Despite extensive studies, the evolution of the LiFePO₄/FePO₄ two-phase coexistence structure and the underlying mechanism are still a point of debate due to the intricate and often disparate phase morphologies observed. Here we apply phase-field simulations to provide detailed insights into the three-dimensional phase evolution process in LiFePO₄ upon delithiation under a large driving force. The simulation reveals that the coherency stress arising from the LiFePO₄/FePO₄ lattice mismatch destabilizes the initially flat delithiation front and induces filamentary growth of the FePO₄ phase along [010], which is in excellent agreement with a recent operando X-ray imaging study. The combined simulation and experimental results provide the first illustration of the phenomenon of stress-induced instability of the lithium (de)intercalation front in battery electrode compounds. We show that this phenomenon is facilitated by the surface mode of coherent spinodal decomposition in LiFePO₄ and influenced by the anisotropies of misfit strain, elasticity and lithium diffusion. It is detrimental to battery performance and life by causing stress concentration and reducing the lithium (de)intercalation kinetics and thus should be mitigated.

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Research Organization:: Rice University, Houston, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0019111; AC02-05CH11231

OSTI ID:: 1803560

Journal Information:: Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 6 Vol. 8; ISSN 2050-7488

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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