Effect of Na2SiO3and TEA Electrolyte Additives on the Corrosion Inhibition of Zinc Electrodes and Electrochemical Performance of Rechargeable Alkaline Manganese Batteries

To inhibit hydrogen evolution corrosion, passivation, and zinc dendrite growth during the charging and discharging of the zinc negative electrode of rechargeable alkaline manganese battery containing ultra-fine zinc powders, the effects of the single addition amounts of inorganic corrosion inhibitor Na2SiO3and organic corrosion inhibitor TEA and their compounding ratio on the corrosion inhibition effect and the charging and discharging performance of alkaline manganese battery were systematically investigated in this paper. SEM and XPS were used to observe the microscopic morphology of the zinc anode, and the inhibition mechanisms of the relevant inhibitors were explored. The results show that, the addition of Na2SiO3and TEA can synergistically improve the coverage of the protective film, thereby inhibiting hydrogen evolution corrosion, passivation and dendrites of zinc electrodes. Compared to blank electrolyte, when the composite concentration of Na2SiO3and TEA is 1 g l−1Na2SiO3+56.25 mg l−1TEA, the hydrogen evolution corrosion inhibition efficiency can reach 70.56%, the initial specific capacity and the specific capacity after 50 cycles can increase from 160.7 mAh g−1, 58 mAh g−1to 198.4 mAh g−1, 74 mAh g−1, respectively. This study has great theoretical and engineering value for guiding the design of electrolytes for rechargeable alkaline manganese batteries.