Simple magnesium salt Mg(CF_(3)SO_(3))_(2)-based electrolytes often exhibit elevated charge-transfer resistance at the electrode interface owing to surface adsorption phenomena.Herein,to overcome this limitation,tetra...Simple magnesium salt Mg(CF_(3)SO_(3))_(2)-based electrolytes often exhibit elevated charge-transfer resistance at the electrode interface owing to surface adsorption phenomena.Herein,to overcome this limitation,tetraethylammonium borohydride(TEABH4)was used as a moisture scavenger to chemically control the moisture content.Moreover,the uniform coverage of TEA+cations on the Mg anode surface regulated the Mg^(2+)reduction rate and enabled the epitaxial growth of magnesium metal deposited along the(002)crystal plane.Electrochemical evaluation showed that the modified electrolyte(MAT-G2)remained stable for over 3500 hours at a current density of 1 mA cm^(-2)and a capacity of 0.5 mA h cm^(-2).Additionally,the fabricated Mg||Cu cells achieved a high coulombic efficiency of 97.3%(over 2500 cycles).The critical current density of the cells reached 5.5 mA cm^(-2),achieving the highest value reported in similar works.This study underscores the critical role of eliminating water contamination and optimizing ion-transport kinetics in enhancing the performance of magnesium metal batteries.展开更多
基金financially supported by the National Natural Science Foundation of China(52274295)Hebei Province Science and Technology Research and Development Platform Special Innovation Capability Enhancement Plan Project(24464402D)+3 种基金the Fundamental Research Funds for the Central Universities(N2423051,N2423005)the Science and Technology Project of Hebei Education Department(QN2024238)The Basic Research Program Project of Shijiazhuang City for Universities Stationed in Hebei Province(241790937A)2025 Hebei Provincial Post-graduate Student Innovation Ability Training Funding Project(CXZZBS2025202,CXZZSS2025157).
文摘Simple magnesium salt Mg(CF_(3)SO_(3))_(2)-based electrolytes often exhibit elevated charge-transfer resistance at the electrode interface owing to surface adsorption phenomena.Herein,to overcome this limitation,tetraethylammonium borohydride(TEABH4)was used as a moisture scavenger to chemically control the moisture content.Moreover,the uniform coverage of TEA+cations on the Mg anode surface regulated the Mg^(2+)reduction rate and enabled the epitaxial growth of magnesium metal deposited along the(002)crystal plane.Electrochemical evaluation showed that the modified electrolyte(MAT-G2)remained stable for over 3500 hours at a current density of 1 mA cm^(-2)and a capacity of 0.5 mA h cm^(-2).Additionally,the fabricated Mg||Cu cells achieved a high coulombic efficiency of 97.3%(over 2500 cycles).The critical current density of the cells reached 5.5 mA cm^(-2),achieving the highest value reported in similar works.This study underscores the critical role of eliminating water contamination and optimizing ion-transport kinetics in enhancing the performance of magnesium metal batteries.
