Journal
JOURNAL OF POWER SOURCES
Volume 472, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228528
Keywords
Mg-air batteries; Micro-alloying; Mg-Ca-In anodes; Discharge activity; Anodic efficiency
Funding
- China Scholarship Council [201606370031, 201706370183, 201606310043]
- Humboldt foundation
- SeaMag project
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Herein we report micro-alloying with the combination of Ca/In as a novel strategy to improve the anode performance for Mg-air batteries. Two micro-alloyed Mg-Ca-In anodes, i.e. Mg-0.1%Ca-0.2%In and Mg-0.2% Ca-0.4%In (wt%), are fabricated and evaluated in both configurations: half-cell and Mg-air full cell. Redeposition of metallic In on anode surface during discharge is demonstrated. Anodic activation is then promoted by galvanic coupling between Mg and the re-deposited In, and film breakdown induced by In reprecipitation at the substrate/oxide film interface. Thus, the voltage and power density of Mg-air system are enhanced via adopting Mg-Ca-In anodes. Besides, wasteful-discharge of the Ca/In micro-alloyed anodes, which is related to the negative difference effect (NDE), is significantly suppressed. Anodic efficiency is consequently improved, reaching 80.2% at 5 mA cm(-2) initial current density, and so is the service life of the Mg-air battery. Due to the enhanced voltage and anodic efficiency, Mg-Ca-In anodes enable Mg-air battery to exhibit outstanding energy density, e.g. 2259 Wh kg(-1) at 5 mA cm(-2). Mg-0.1%Ca-0.2%In anode possesses superior performance in terms of low wasteful-discharge, enhanced discharge activity and high anodic efficiency. Therefore, we recommend micro-alloyed Mg-Ca-In, like Mg-0.1%Ca-0.2%In, as excellent candidates for anode materials of primary aqueous Mg-air batteries.
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