(1. 上海交通大學(xué) 輕合金精密成型國家工程研究中心，上海 200240；
2. 上海交通大學(xué) 金屬基復(fù)合材料國家重點(diǎn)實(shí)驗(yàn)室，上海 200240；
3. 上海交通大學(xué) 化學(xué)化工學(xué)院，上海 200240)
摘 要: 采用扣式電池循環(huán)伏安測試(CV)、充放電測試和掃描電子顯微(SEM)技術(shù)，研究AZ31合金與工業(yè)純鎂(99.95%)作為鎂二次電池負(fù)極材料時(shí)的電化學(xué)性能和鎂在電極表面的沉積形貌。結(jié)果表明：作為鎂二次電池的負(fù)極材料，AZ31合金與工業(yè)純鎂相比，其鎂的溶解−沉積的過電位稍高，初始循環(huán)過程的庫侖效率略低，但長期循環(huán)的庫侖效率穩(wěn)定，并能有效抑制枝晶鎂的形成，且其長期循環(huán)性能優(yōu)于工業(yè)純鎂的。
關(guān)鍵字: 鎂二次電池；AZ31合金；工業(yè)純鎂；負(fù)極材料；電化學(xué)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
