An electrically rechargeable Al-Air battery with aprotic ionic liquid electrolyte

N. Bogolowski, J.-F. Drillet

JECS transactions, Prime 2016, accepted

Abstract

In this work, some preselected aprotic ionic liquids such as EMImOTf, EMImOAc and BMPyrOTf were screened with respect to their contact angle on Pt/C and LCCO/C gas diffusion electrodes as well as their affinity to catalyze both air and aluminum reactions. Highest contact angles were measured on Pt/C GDE. While all systems showed a certain activity for ORR/ORR reactions, none of them, excepted EMImCl + AlCl3 (1:1.5) reference electrolyte, was able to dissolved/precipitate aluminum salt on metal electrode. In that context, the Cl-based reference electrolyte was chosen for tests under full-cell conditions. Discharging/charging procedure was successfully carried out at 100 µAcm‑2 for 15 cycles/200 h, so that feasibility of a rechargeable Al/air cell in dried air with a aluminum foil, aprotic EMImCl + AlCl3(1:1.5) as electrolyte and Pt/C as oxygen catalyst has been demonstrated for the first time.

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