首页|A combined computational/experimental study of anode-concerned voltage drop in aqueous primary Mg-air batteries

A combined computational/experimental study of anode-concerned voltage drop in aqueous primary Mg-air batteries

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The voltage drop appearing at Mg anode-electrolyte interface is a critical issue for the battery power and energy density of aqueous primary Mg-air batteries.The respective voltage loss is typically assigned to the deposits layer forming on the anode surface during discharge.In this work,we experimentally and computationally investigate the critical factors affecting the voltage drop at Mg anode towards a deeper under-standing of the contribution of deposit and its growth.A two-dimensional(2D)mathematical model is proposed to compute the voltage drop of Mg-0.15％Ca(mass fraction)alloy(Mg-0.15Ca)by means of a semi-empirical formulas and experiments-based modification model,considering the effect of discharge current density,the negative difference effect(NDE)and surface deposits layer itself.This model is utilized to simulate the discharge potential of the anode at predefined experimental current densities.The computed voltage drop(half-cell voltage)is in good agree-ment with the experimental value.The applicability of the mathematical model is successfully validated on the second material(namely high-pu-rity Mg).

Aqueous Mg-air batteryVoltage dropNDECharge transferDeposits-related resistances

Wen Xu、Min Deng、Darya Snihirova、Linqian Wang、Yulong Wu、Sviatlana V.Lamaka、Mikhail L.Zheludkevich、Daniel H?che

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Institute of Surface Science,Helmholtz-Zentrum Hereon,21502 Geesthacht,Germany

School of Materials Science and Engineering,Hebei University of Technology,300000,Tianjin,China

Institute for Materials Science,Faculty of Engineering,Kiel University,24143 Kiel,Germany

China Scholarship Council for the award of fellowshipChina Scholarship Council for the award of fellowshipdtec.bw-Digitalization and Technology Research Center of the BundeswehrZentrum für Hochleistungsmaterialien(ZHM)GIF,the German-Israeli Foundation for Scientific Research and Development

201908510177202106050030

2024

10.1016/j.jma.2024.02.011

镁合金学报(英文)

镁合金学报(英文)

EI
ISSN：2213-9567
年,卷(期)：2024.12(5)