Rapidly Solidified AZ31 Magnesium Alloy Ribbons Used in Rechargeable Batteries

Abstract

Better properties of magnesium make it a natural choice for use as an anode material in rechargeable batteries. However, the magnesium alloy thin sheets used in rechargeable batteries were produced by ingot casting and rolling. That technology was so complex and the cost was high. Rapidly solidification by melt spinning is an effect way to solve that problem. In this paper, the technology of rapidly solidified (RS) ribbons in Mg-3%Al-1%Zn-0.2%Mn alloy has been investigated using melt spinning technique. The effect of wheel speed on thickness and microhardness of the ribbons is presented. Microhardness is found to increase with the wheel speed. Rapidly solidification leads to small grains (1~2 µm). The plasticity of the ribbons was well. The quantity of Mg17Al12 decreases with the increase in wheel speed. When the wheel speed reaches 1600 rpm, no Mg17Al12 phase precipitates. As the increase of the wheel speed, the corrosion resistance of the ribbons changes better.

Texture and High Yield Strength of Rapidly Solidified AZ31 Magnesium Alloy Extruded at 250 °C

“…Obviously, the peaks of Mg 17 Al 12 are still indexed in the spectra of the as-homogenized AZ31, which is related to the air-cooling after homogenization treatment. However, they are not observed in as-RS AZ31, which is in line with the other RS process reported[32]. In addition, the characteristic peak positions of α-Mg in as-RS AZ31 are shifted by about 0.1 • towards the large angle direction compared to the standard Mg (PDF#35-0821), which is the result of alloying elements such as Al and Zn with smaller atomic radii displacing the α-Mg atoms, leading to a reduction in the inter-planar crystal spacing (atomic sizes: Mg/160 pm, Zn/134 pm, Al/143 pm).…”

Re-envisioning the Key Factors of Magnesium Metal Anodes for Rechargeable Magnesium Batteries

“…Examples include the uneven Mg plating, Mg dendrites growth, abnormal self-accelerating pit growth stripping, etc. , Moreover, there is still no efficient, practical, and high-quality Mg foil manufacturing process to match the current cathode materials and RMBs utilizations. Owing to the poor manufacturing capability of pure Mg, currently ultra-thin pure Mg foils (<100 μm) are usually prepared by melt-spinning, rapid solidification, hot-rolling, etc., − yet those methods are unsuitable for practical applications due to issues of low efficiency, low yield, easy oxidation, and difficulty to control accuracy. Manufacturing processes deserve more in-depth consideration in order to extract their full value and ultimately advance the field of RMBs.…”