Anode Properties of AZ31 Ribbon Manufactured by Single-Roll Rapid Solidification Method for Magnesium Rechargeable Battery

Abstract

The development of innovative storage batteries for carbon neutrality is an urgent issue. In particular, magnesium has huge potentialities as an anode material from its theoretical volumetric capacity superior to that of lithium. Secondly, magnesium has been one of the most abundant elements in the Earth’s crust. In general, magnesium-based materials as an anode has been manufactured by cold rolling which requires multistage process including heat treatment. We have studied rapid solidification process to develop low-cost mass production technology. In this study, we have focused on Mg-3mass%Al-1mass%Zn alloy (AZ31), which is the most commonly rolled magnesium alloy, and prepared it by rapid solidification to evaluate its electrochemical activity with the rolled material. The AZ31 ribbons that exhibited superior electrochemical activity had a random orientation and fine microstructure. These experimental results suggest that the presence of electrochemically inactive crystal planes as well as an increase in the grain boundary area is important.