Effect of yttrium and calcium additions on electrochemical behaviors and discharge performance of AZ80 anodes for Mg-air battery  

钇和钙的添加对镁-空气电池阳极材料AZ80电化学行为和放电性能的影响

作　　者：Yu-wen-xi ZHANG Lu HAN Lin-bao REN Ling-ling FAN Yang-yang GUO Ming-yang ZHOU Gao-feng QUAN 张钰雯茜;韩璐;任凌宝;范玲玲;郭阳阳;周明扬;权高峰(西南交通大学材料科学与工程学院材料先进技术教育部重点实验室,成都610031;西安交通大学金属材料强度国家重点实验室微纳尺度材料行为研究中心,西安710049;西安稀有金属材料研究院有限公司,西安710049;中国核动力研究设计院核反应堆系统设计技术重点实验室,成都610213)

机构地区：[1]Key Laboratory of Advanced Technologies of Materials(Ministry of Education),School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China [2]Center for Advancing Materials Performance from the Nanoscale,State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China [3]Xi’an Rare Metal Materials Institute Co.,Ltd.,Xi’an 710049,China [4]Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu 610213,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第8期2510-2526,共17页中国有色金属学报（英文版）

基　　金：financial supports from the Key Development Project of Sichuan Province,China (No.2017GZ0399);the National Natural Science Foundation of China (No.52061040);the Open Projects of the Key Laboratory of Advanced Technologies of Materials,Ministry of Education,Southwest Jiaotong University,China (No.KLATM202003)。

摘　　要：The effects of yttrium(Y)and yttrium+calcium(Y+Ca)additions on the electrochemical properties and discharge performance of the as-extruded Mg−8Al−0.5Zn−0.2Mn(AZ80)anodes for Mg−air batteries were investigated.The results show that the addition of 0.2 wt.%Y increased the corrosion resistance and discharge activity of AZ80 anode.This was attributed to the fine and sphericalβ-Mg_17)Al_(12) phases dispersing evenly in AZ80+0.2Y alloy,which suppressed the localized corrosion and severe“chunk effect”,and facilitated the rapid activation ofα-Mg.Combinative addition of 0.2 wt.%Y and 0.15 wt.%Ca generated grain refinement and a reduction of theβ-Mg_17)Al_(12) phase,resulting in a further enhancement in discharge voltage.However,the incorporation of Ca in Mg_17)Al_(12) and Al_(2)Y compounds compromised the corrosion resistance and anodic efficiency of AZ80+0.2Y+0.15Ca anode.Consequently,AZ80+0.2Y anode exhibited excellent overall discharge performance,with the peak discharge capacity and anodic efficiency of 1525 mA·h·g^(−1) and 67%at 80 mA/cm^(2),13%and 14%higher than those of AZ80 anode,respectively.研究钇(Y)、钇+钙(Y+Ca)的添加对镁−空气电池阳极材料Mg−8Al−0.5Zn−0.2Mn(AZ80)合金电化学行为和放电性能的影响。结果表明,添加0.2%(质量分数)的Y可以提高AZ80阳极的耐腐蚀性和放电活性。这是因为在AZ80+0.2Y合金基体中分布着细小弥散的球形β-Mg_17)Al_(12)相,可以抑制严重的局部腐蚀和“块状效应”,还有利于α-Mg的快速活化。同时添加0.2%Y和0.15%Ca(质量分数)会使晶粒细化、β-Mg_17)Al_(12)相减少,导致放电电压进一步提高。然而,AZ80+0.2Y+0.15Ca阳极的耐蚀性和阳极效率却不如AZ80+0.2Y,这主要与Mg_17)Al_(12)和Al_(2)Y化合物中掺杂了Ca有关。因此,AZ80+0.2Y阳极表现出优异的综合放电性能,在电流密度为80 mA/cm^(2)时,其放电容量和阳极效率最高,分别为1525 mA·h·g^(−1)和67%,比AZ80合金阳极的分别提高13%和14%。

关 键 词：Mg-air battery Mg-Al-Zn anode discharge performance electrochemical behavior 

分 类 号：TM911.41[电气工程—电力电子与电力传动] TG146.22[一般工业技术—材料科学与工程]