铝含量对Mg_(2-x)Al_(x)Ni镁基储氢新能源汽车电池合金性能的影响  

Effect of aluminum content on the properties of Mg_(2-x)Al_(x)Ni magnesium-based hydrogen-storage alloy for new energy vehicle battery

作　　者：谢金良 张湘[2] XIE Jin-liang;ZHANG Xiang(Langfang Polytechnic Institute,Langfang 065001,China;School of Intelligent Science,University of National Defense Science and Technology,Changsha 410073,China)

机构地区：[1]廊坊职业技术学院,河北廊坊065001 [2]国防科技大学智能科学学院,湖南长沙410073

出　　处：《轻合金加工技术》2021年第1期65-70,共6页Light Alloy Fabrication Technology

基　　金：国家自然科学基金资助项目(50475058);河北省教育科学“十一五”规划青年专项课题(10030033)。

摘　　要：电化学循环稳定性和耐碱液腐蚀性能较差制约了镁基储氢新能源汽车电池合金的发展。采用球磨后烧结的两步法制备了Mg_(2-x)Al_(x)Ni(x=0,0.1,0.2,0.3,0.4,0.5)储氢新能源汽车电池合金试样,并进行了显微组织、充放电循环和耐碱液腐蚀试验及分析。结果表明:随Al含量增加,合金放电容量衰减率先减小后增大,腐蚀电位先正移后负移,合金电化学循环稳定性和耐碱液腐蚀性能先提高后下降。Mg_(2-x)Al_(x)Ni(x<0.3)合金内部“白亮颗粒”大小不一、分布均匀性较差;Mg_(2-x)Al_(x)Ni(x=0.4)合金内部“白亮颗粒”尺寸较为一致呈均匀分布;Mg_(2-x)Al_(x)Ni(x=0.5)合金内部“白亮颗粒”尺寸和缺陷体积均明显增大。与Mg_(2)Ni相比,Mg_(2-x)Al_(x)Ni(x=0.4)合金充放电循环10次后的放电容量衰减率从60%减小至36%,腐蚀电位从-0.946523V正移至-0.907812V,合金具有最佳的电化学循环稳定性和耐碱液腐蚀性能。The development of Mg-based hydrogen-storage new energy automotive battery alloy is restricted by the poor electrochemical cycle stability and alkali corrosion resistance.Mg_(2-x)Al_(x)Ni(x=0,0.1,0.2,0.3,0.4,0.5)hydrogen-storage new energy automobile battery alloy samples were prepared by two-step method after ball milling and sintering.The micro-structure,charge-discharge cycle and alkali resistance test and analysis were carried out.The results show that with the increase of Al content,the decay of discharge capacity first decreases and then increases,the corrosion potential first moves positively and then moves negatively,and the electrochemical cycle stability and alkali resistance of the alloy first in-crease and then decrease.The sizes of“white bright particles”in Mg_(2-x)Al_(x)Ni(x<0.3)alloy are different,and the distribution uniformity is poor;the sizes of“white bright particles”in Mg2-Al,Ni(x=0.4)alloy are relatively uniform,and the sizes of“white bright particles”and the volume of defects in Mg_(2-x)Al_(x)Ni(x=0.5)alloy are significantly increased.Com-pared with Mg_(2)Ni,the decay rate of discharge capacity of Mg_(2-x)Al_(x)Ni(x=0.4)alloy decrea-ses from 60%to 36%after 10 charge-discharge cycles,and the corrosion potential changes from-0.946523 V to-0.907812 V.The alloy has the best electrochemical cycle stabili-ty and alkali resistance.

关 键 词：Mg_(2-x)Al_(x)N储氢合金 电化学循环稳定性 耐碱液腐蚀性能 AL含量 

分 类 号：TG146.22[一般工业技术—材料科学与工程]