A micro-alloyed Mg-Zn-Ge alloy as promising anode for primary Mg-air batteries  

作　　者：Pingli Jiang Depeng Li Ruiqing Hou Hong Yang Junjie Yang Shijie Zhu Liguo Wang Shaokang Guan 

机构地区：[1]School of Materials Science and Engineering&Henan Key Laboratory of Advanced Magnesium Alloys,Zhengzhou University,No.100 Science Avenue,Zhengzhou 450001,China [2]Center of Advanced Analysis&Gene Sequencing,Zhengzhou University,No.100 Science Avenue,Zhengzhou 450001,China [3]College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China [4]Institute of Advanced Wear&Corrosion Resistant and Functional Materials,Jinan University,Guangzhou 510632,China

出　　处：《Journal of Magnesium and Alloys》2024年第10期4157-4173,共17页镁合金学报(英文)

基　　金：financial supports including the China Postdoctoral Science Foundation(Grand No.2022M710132);the Henan Postdoctoral Foundation(Grand No.202102006);the Natural Science Foundation of Henan Provincial(Grand No.222300420309);the Startup Research Fund of Zhengzhou University(Grand Nos.32340146,and 32212551);support by National Natural Science Foundation of China(Grand No.52101084);Guangzhou Basic and Applied Basic Research Foundation(Grand No.202102020612).

摘　　要：Alloying is one of the effective approaches to boost the discharge property of magnesium(Mg)anodes for primary Mg-air batteries and recently micro-alloying is highly recommended at the aim of developing advanced primary Mg system.In this study,micro-alloyed extruded Mg0.5Zn0.2Ge(in wt.%)alloy is evaluated as an anode candidate for primary Mg-air batteries in both half-cell and Mg-air full cell configurations,in comparison with commercially accepted Mg anodes,typified by as-cast HP Mg and extruded AZ31 alloy.The corrosion behavior at open circuit potential(OCP)condition of the three materials is also compared through electrochemical tests.Mg0.5Zn0.2Ge alloy displays the most negative OCP value and the highest corrosion resistance at OCP.During discharge,Mg0.5Zn0.2Ge anode exhibits low wasteful-discharge rate and homogeneous dissolution that gives rise to the absence of“chunk effect”.Consequently,the anodic efficiency and specific capacity of Mg0.5Zn0.2Ge anode are superior to those of HP Mg and AZ31 anodes,e.g.57.3%and 1257 mAh g^(−1)at 1 mA cm^(−2).Additionally,Mg-air battery based on Mg0.5Zn0.2Ge anode offers higher cell voltage and specific energy than those assembled with HP Mg and AZ31 anodes,which can be further optimized by addition of electrolyte additives.Therefore,micro-alloyed Mg0.5Zn0.2Ge alloy can serve as a promising candidate for anode material of primary Mg-air batteries.

关 键 词：Mg-Zn-Ge anode Magnesium-air battery Micro-alloying Discharge property 

分 类 号：TG1[金属学及工艺—金属学]