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Article Dans Une Revue International Journal of Hydrogen Energy Année : 2014

In situ monitoring of the volume change and cracking of a MgTi hydride electrode

A. Etiemble
L. Roué

Résumé

Metastable MgTi-10 wt% Pd alloy was synthesized by high-energy ball milling and evaluated as metal hydride electrode for Ni-MH batteries. In situ acoustic emission and generated/relaxed force measurements were performed to monitor the particle cracking and volume expansion/contraction of the electrode occurring during electrochemical charge-discharge cycling. On the basis on these measurements, it was shown that the electrochemical hydrogenation of the MgTi alloy occurs first by an irreversible hydrogenation (corresponding to a charge capacity of 500 mA h g-1) followed by a reversible hydrogenation (resulting in a discharge capacity of 370 mA h g-1). This second step induces MgTi particle cracking and electrode collapse. During the subsequent cycles, a more reversible volume expansion/contraction is observed and the particle cracking becomes progressively less intensive and originates from the hydrogen evolution reaction rather than to the hydrogen absorption reaction. © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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Dates et versions

hal-01808073 , version 1 (05-06-2018)

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A. Etiemble, Hassane Idrissi, L. Roué. In situ monitoring of the volume change and cracking of a MgTi hydride electrode. International Journal of Hydrogen Energy, 2014, 39 (19), pp.10169-10174. ⟨10.1016/j.ijhydene.2014.04.135⟩. ⟨hal-01808073⟩
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