Open AccessStudy on electrolyte additives of water-based magnesium batteries
Author(s) -
Panpan Wang,
Jing Xu,
Youlai Gong,
Changguo Chen
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/781/4/042015
Subject(s) - magnesium , tafel equation , electrolyte , anode , corrosion , passivation , polarization (electrochemistry) , electrochemistry , materials science , magnesium alloy , inorganic chemistry , dielectric spectroscopy , chemistry , metallurgy , electrode , composite material , layer (electronics)
The effects of different inorganic salt additives on the corrosion resistance, hysteretic behavior and activation potential of magnesium anode in MgSO 4 -Mg(NO 3 ) 2 composite electrolyte (1.86 mol·L-1 Mg(NO 3 ) 2 + 0.14 mol·L-1 MgSO 4 ) were compared by electrochemical method. The electrochemical test results showed that in the solution containing 0.02 mol/L NaHCO 3 , the activation potential of magnesium anode was the most positive, the passivation range was expanded, and the polarization current was reduced. The impedance of magnesium alloy with 0.02 mol/L NaHCO 3 has the highest corrosion resistance, which is consistent with the conclusion that the corrosion current density of Tafel polarization curve is the lowest. Under the additive concentration, the magnesium anode has the shortest lag time, the most negative discharge potential and the least potential drop, which greatly improve the discharge performance of magnesium anode.