(1. 上海交通大学 轻合金精密成型国家工程研究中心，上海 200240；
2. 上海交通大学 金属基复合材料国家重点实验室，上海 200240；
3. 上海交通大学 化学化工学院，上海 200240)
摘 要: 采用扣式电池循环伏安测试(CV)、充放电测试和扫描电子显微(SEM)技术，研究AZ31合金与工业纯镁(99.95%)作为镁二次电池负极材料时的电化学性能和镁在电极表面的沉积形貌。结果表明：作为镁二次电池的负极材料，AZ31合金与工业纯镁相比，其镁的溶解−沉积的过电位稍高，初始循环过程的库仑效率略低，但长期循环的库仑效率稳定，并能有效抑制枝晶镁的形成，且其长期循环性能优于工业纯镁的。
关键字: 镁二次电池；AZ31合金；工业纯镁；负极材料；电化学性能；表面形貌
（1. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University,
Shanghai 200240, China;
2. State key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China;
3. School Chemistry and of Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract:The electrochemical properties and surface morphologies of AZ31 alloy and commercial pure Mg as anode materials for rechargeable magnesium batteries were studied by cyclic voltammetry (CV), constant current charge/discharge measurement of coin-type cells and scanning electron microscopy (SEM). The results show that the over-potential of dissolution-deposition for magnesium on AZ31 alloy is a little higher than that on commercial pure Mg, and the coulombic efficiency during the initial cycle is lower than that of pure Mg; but the coulombic efficiency of AZ31 remains stable in the long-term cycle. Furthermore, AZ31 alloy effectively restrains the formation of dendrite Mg and improves the cyclic performance of batteries.
Key words: rechargeable magnesium battery; AZ31 alloy; commercial pure Mg; anode materials; electrochemical properties; surface morphologies
