Electrochemical Performance of Al-Zn-In-Mg-Ga-Mn Alloys as Anodes for Al-Air Batteries
The free corrosion behavior and electrochemical properties of Al-Zn-In-Mg-Ga-Mn alloys,as anodes working with 2 mol/L NaCl and 4 mol/L KOH electrolytes were studied.Results revealed that in the two electrolytes,the corrosion potential(Ecorr)of alloy anodes shifted negatively by 0.041 V and 0.018 V,and the free corrosion rates decreased by 0.2146 and 15.1 mg·cm-2·h-1,respectively in the contrast to those of pure Al anode.The electrochemical activity of pure Al anode was improved,while its free corro-sion behavior was inhibited.In the 2 mol/L NaCl electrolyte,the discharge capacity peak of the alloy an-ode reached 2608.96 Ah·kg-1,which was 55.59％higher than that of the pure Al anode.The highest ener-gy density attained 1742.61 Wh·kg-1,being 274.58％superior to that of the pure Al anode.The anode effi-ciency was 87.55％.In the 4 mol/L KOH electrolyte,the highest discharge capacity of the Al-Zn-In-Mg-Ga-Mn alloy anode was 1605.15 Ah·kg-1,which was 131.27％higher than that of the pure Al anode.The high-est energy density was 1404.83 Wh·kg-1,which was 231.52％higher than that of the pure Al anode.The anode efficiency was 53.86％.
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