Electrolyte additives as effective way to improve aqueous Mg-air battery performance

events hall

Dr. Darya V Snihirova

24.11.2022

David Wang Auditorium, 3rd floor Dalia Meidan Bldg.

14:30

Mg-air battery is a primary aqueous battery with high theoretical voltage and specific energy density. Aqueous Mg-air batteries consist of magnesium anode coupled with an air electrode. During the discharge, high self-corrosion rate and low utilization efficiency of Mg anode reduce the performance of Mg-air battery. Additionally, the layer of corrosion products precipitated on magnesium reduces the active surface of the anode. Several strategies evolved to overcome these issues, alloy development and electrolyte modification. Use of electrolyte additives is an effective way to control interfacial process. It is inexpensive and straight-forward approach for improving issues related to self-corrosion of Mg. As was previously shown, Mg2+ complexing agents are able to improve the anodic efficiency by decreasing the occurrence of self-corrosion and “chunk-effect”. Usually the additives have higher impact on either utilization efficiency or discharge potential. The use of versatile electrolyte additive is needed. In this work the performance of 2,6-dihydroxybenzoate (2,6DHB) as versatile additive positively affecting both mentioned parameters is demonstrated. The presence of 2,6DHB in the electrolyte reveals simultaneous improvement of the discharge activity and inhibition of the self-corrosion of Mg-0.15Ca anode, leading to negative average potential and high anodic utilization efficiency.

Host: Prof. Yair Ein-Eli