Toward new proton exchange batteries based on ionic liquid electrolyte: Metal hydride electrode / electrolyte coupling

The voltage of an alkaline electrolyte-based battery is limited by the narrow electrochemical stability window of water. As an alternative to water, protic ionic liquid (IL)-based electrolytes have shown excellent conducting properties as well as a wide electrochemical stability window, and can ther...

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Bibliographic Details
Published in:Journal of power sources 2023-08, Vol.574, p.233176, Article 233176
Main Authors: Chaabene, N., Zhang, J., Turmine, M., Kurchavova, E., Vivier, V., Cuevas, F., Mateos, M., Latroche, M., Monnier, J.
Format: Article
Language:English
Subjects:
Chemical Sciences
Metal hydride
Protic ionic liquid
Proton batteries
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Summary:The voltage of an alkaline electrolyte-based battery is limited by the narrow electrochemical stability window of water. As an alternative to water, protic ionic liquid (IL)-based electrolytes have shown excellent conducting properties as well as a wide electrochemical stability window, and can therefore be implemented in protonic batteries. In this work, we present the physicochemical properties of different ILs that have been selected for their potential use in protonic batteries; namely, one aprotic IL (1-ethyl-3-methylimidazolium acetate [EMIM][Ac]) mixed with acetic acid (Ac.A) as proton donor, two protic ILs, the pyrrolidinium formate [Pyrr][F] and the pyrrolidinium acetate [Pyrr][Ac] and mixtures with their parent acid or base. The electrochemical properties of an AB5-type compound as negative electrode in a half-cell configuration using these ILs as electrolyte are then reported. A discharge capacity of 221 mAh·g−1 was attained at C/40 regime with low charge/discharge overpotential. Moreover, stable cycling performance was obtained by using [Pyrr][Ac] as IL, with an electroactivity window of 2.2 V enlarged compared to the one of KOH. [Display omitted] •Investigation of metallic hydride negative electrode with an ionic liquid electrolyte•The protic ionic liquid [Pyrr][Ac] allows the best performances•A discharge capacity of 221 mAh·g−1 is obtained in [Pyrr][Ac] at a C/40 regime•Stable cycling performance was obtained•The hydrogenation of the AB5 electrode material is evidenced by X-ray diffraction
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2023.233176