Processing Micro-Alloyed Mg-La Binary Alloy into a High-Performance Mg-Air Battery Anode via Extrusion
Yan Song, Ke Yao, Qin Zou, Qin Yang, Bin Jiang, Lude Wang, Ming Yuan, Qinghang Wang, Guangsheng Huang, Fusheng Pan
Abstract
Micro-alloyed Mg-0.4 (wt.%) La alloy is recommended for Mg-air battery anode material. Two Mg-La anodes with different microstructures, i.e., as-cast and extruded, are fabricated by casting and extrusion technology. The effect of morphologies on discharge of Mg-La alloys is studied and examined by anodic self-discharge behavior and discharge performance. The extruded Mg-La anode releases less hydrogen during the discharge and shows limited chunk effect than the as-cast anode. Anodic efficiency is enhanced consequently, reaching 77.3% at 10 mA cm –2 . This alloy enhances the discharge property of Mg-air battery and enables cell with higher voltage and energy density, compared with the as-cast alloy and re-cast Mg.