Zinc-air rechargeable battery

[Moreno]

One of the zinc-air rechargeable battery largest problems is water based alkalic or acidic electrolyte. However promising organic, polymeric and ionic liquid electrolytes provide thousands of times smaller currents than water based ones for now. What is exactly problem there?

Quote

While ionic liquids are generally too viscous to properly wet the air electrode,⁸⁰ most organic solvents (e.g. acetonitrile) easily flood PTFE and the carbon electrode pores, pushing out the gas. Both circumstances lead to the greatly diminished triple phase boundary essential to ORR electrocatalysis. It is suggested that in non-aqueous lithium–air batteries, an electrode–electrolyte “two-phase reaction zone” is in effect. In this model, the air electrode is completely wetted with the liquid electrolyte, and only oxygen dissolved in the electrolyte actually participates in the charge-transfer process (Fig. 6b).^97,98 This may partly explain the much smaller observed current density (about three orders of magnitude) non-aqueous metal–air batteries are able to deliver compared to aqueous versions. To tackle this problem, Balaish and co-workers impregnated an air electrode with perfluorocarbons as the special oxygen carriers, which are immiscible with aprotic electrolytes used in lithium–air batteries

https://pubs.rsc.org/en/content/articlehtml/2014/cs/c4cs00015c

Which type of rechargeable metal-air battery could be more promising than zinc-air?