Donghee Chang
Elucidating the origins of phase transformation hysteresis during electrochemical cycling of Li-Sb electrodes
Chang, Donghee; Huo, Hua; Johnston, Karen E.; Ménétrier, Michel; Monconduit, Laure; Grey, Clare P.; Van der Ven, Anton
Authors
Hua Huo
Dr Karen Johnston karen.johnston@durham.ac.uk
Associate Professor
Michel Ménétrier
Laure Monconduit
Clare P. Grey
Anton Van der Ven
Abstract
We investigate the origins of phase transformation hysteresis in electrodes of Li-ion batteries, focusing on the alloying reaction of Li with Sb. Electrochemical measurements confirm that the reaction path followed during Li insertion into Sb electrodes differs from that followed upon subsequent Li extraction. Results from first-principles calculations and NMR measurements indicate that Li3Sb is capable of tolerating high Li-vacancy concentrations. An unusually high Li mobility in Li3Sb facilitates over potentials during charging, which leads to a substantially larger driving force for the nucleation of Sb compared to that of Li2Sb. The differences in nucleation driving forces arise from a lever effect that favors phases with large changes in Li concentration over phases that are closer in composition along the equilibrium path. These properties provide an explanation for the observed path hysteresis between charge and discharge in the Li–Sb system and likely also play a role in intercalation compounds and other alloying reactions exhibiting similar phase transformation hysteresis.
Citation
Chang, D., Huo, H., Johnston, K. E., Ménétrier, M., Monconduit, L., Grey, C. P., & Van der Ven, A. (2015). Elucidating the origins of phase transformation hysteresis during electrochemical cycling of Li-Sb electrodes. Journal of Materials Chemistry A: materials for energy and sustainability, 3(37), 18928-18943. https://doi.org/10.1039/c5ta06183k
Journal Article Type | Article |
---|---|
Acceptance Date | Aug 11, 2015 |
Online Publication Date | Aug 11, 2015 |
Publication Date | Aug 11, 2015 |
Deposit Date | Sep 30, 2016 |
Publicly Available Date | Aug 28, 2018 |
Journal | Journal of Materials Chemistry A: materials for energy and sustainability |
Print ISSN | 2050-7488 |
Electronic ISSN | 2050-7496 |
Publisher | Royal Society of Chemistry |
Peer Reviewed | Peer Reviewed |
Volume | 3 |
Issue | 37 |
Pages | 18928-18943 |
DOI | https://doi.org/10.1039/c5ta06183k |
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