Evading efficiency-voltage trade-off in magnesium-air batteries through solute atoms and second phases synergy  

作　　者：Hongxing Liang Liang Wu Chenchen Zhao Chuantian Zhai Wenbo Du 

机构地区：[1]College of Materials Science&Engineering,Beijing University of Technology,Beijing,100021,China [2]College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China

出　　处：《Journal of Magnesium and Alloys》2025年第2期719-730,共12页镁合金学报(英文)

基　　金：the R&D Program of Beijing Municipal Education Commission(No.KM202310005010);the National Natural Science Foundation of China(No.52001015)for their financial support.

摘　　要：The quest for high-energy-density magnesium-air batteries is hindered by the efficiency-voltage trade-off,ultimately leading to an unsatisfactory energy density.Here,we effectively mitigate the inherent efficiency-voltage trade-off by introducing a novel anode material,specifically,Mg-0.5Sn-0.5In-0.5Ga.This anode demonstrates exceptional anodic efficiency,achieving 60.5±2.5%at 1 mA cm^(-2),65.3±2.7%at 10 mA cm^(-2),and 71.4±1.2%at 20 mA cm^(-2).Furthermore,the discharge voltage is significantly enhanced,reaching 1.76±0.01 V at 1 mA cm^(-2),1.44±0.02 V at 10 mA cm^(-2),and 1.21±0.08 V at 20 mA cm^(-2).Consequently,our newly developed anode exhibits a remarkable energy density of 2312±98 W h kg^(-1),placing it among the top-performing magnesium anodes documented in the literature.Density functional theory calculations and experimental investigations have unveiled that the exceptional performance can be attributed to the inhibition of water reduction,facilitated by the hybridization between solute atoms and neighboring Mg atoms.Furthermore,the activation of the second phase,introducing additional galvanic couples,significantly contributes to this performance.This study presents valuable insights that can guide the design of novel anodes,contributing to the advancement of high-performance magnesium-air batteries.

关 键 词：Magnesium anode Corrosion Discharge mechanism Theoretical calculation 

分 类 号：TM911.41[电气工程—电力电子与电力传动]