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Issue 37, 2015
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Elucidating the origins of phase transformation hysteresis during electrochemical cycling of Li–Sb electrodes

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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.

Graphical abstract: Elucidating the origins of phase transformation hysteresis during electrochemical cycling of Li–Sb electrodes

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Publication details

The article was received on 07 Aug 2015, accepted on 11 Aug 2015 and first published on 11 Aug 2015


Article type: Paper
DOI: 10.1039/C5TA06183K
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Citation: J. Mater. Chem. A, 2015,3, 18928-18943
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    Elucidating the origins of phase transformation hysteresis during electrochemical cycling of Li–Sb electrodes

    D. Chang, H. Huo, K. E. Johnston, M. Ménétrier, L. Monconduit, C. P. Grey and A. Van der Ven, J. Mater. Chem. A, 2015, 3, 18928
    DOI: 10.1039/C5TA06183K

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