Abstract
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.
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