Journal
JOURNAL OF POWER SOURCES
Volume 460, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228106
Keywords
Aqueous primary Mg-air battery; Electrolyte additives; Mg2+ complexing agent; Discharge performance; Chunk effect
Funding
- China Scholarship Council [201706370183, 201606370031]
- Alexander von Humboldt foundation
- ERA-NET cofund MarTERA
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Aqueous primary Mg-air batteries exhibit many merits as potential energy storage and conversion devices. In this work, the discharge performance of water based Mg-air batteries with advanced Mg-Ca anode was boosted by adding Mg2+ complexing agents into the electrolyte. The effect of electrolyte additives on the corrosion behavior and discharge properties of micro-alloyed Mg-Ca anode was investigated via hydrogen evolution test and half-cell discharge test. Electrochemical impedance spectroscopy (EIS) was performed to evaluate the effect of different electrolyte additives on the discharge activity of Mg-Ca anode. Basic characteristics of aqueous Mg-air battery in selected additive solution were tested and compared to pure NaCl solution. The results show that the addition of dedicated Mg2+ complexing agents can efficiently increase the discharge voltage and specific energy of respective Mg-air batteries. At 0.5 mA cm(-2), the discharge voltage reaches 1.86 V with regard to the cell containing 0.1 M 5-Sulfosalicylate, which is 270 mV higher than the discharge voltage in bulk 3.5 wt % NaCl. The highest specific energy for the tested system is above 3.0 kWh kg(-1) in NaCl solution with 0.1 M citrate at 1 mA cm(-2) discharge current density.
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