Influence of Li2CrO4 as additive for NaCl electrolyte on Mg-air battery discharge performances

Li2CrO4 in different amounts was used as an electrolyte additive for Mg-air batteries based on a 0.6 M NaCl solution in this study. The effect of Li2CrO4 content on the corrosion behaviour of AZ31 alloy in 0.6 M NaCl solution was studied by EIS curves, polarization curves and hydrogen evolution tests; the influence of Li(2)CrO4 content on the discharge performance of Mg-air batteries was studied by constant current discharge tests. The addition of Li2CrO4 in different amounts significantly improved the corrosion resistance of the AZ31 alloy and the anode efficiency of the Mg-air battery. The anode efficiency of the Mg-air battery increased obviously with the increase in the added amount of Li2CrO4 when this amount was less than 0.02 M but underwent no significant change when it was greater than 0.02 M. In addition, when the added amount of Li2CrO4 reached 0.1 M, the discharge voltage of the battery dropped dramatically, and the voltage lag time also increased greatly. Therefore, the optimal added amount of Li2CrO4 is 0.02 M.

Automated summary

The study found that adding an appropriate amount of Li2CrO4 to Mg-air batteries can significantly improve the corrosion resistance of the AZ31 alloy and the discharge performance of the battery. The anode efficiency of the battery increases with the increase in Li2CrO4 content when it is less than 0.02M, but no significant change is observed when it is greater than 0.02M. Additionally, when the content reaches 0.1M, the discharge voltage of the battery drops dramatically, and the voltage lag time also increases greatly.