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| Adding additives to the electrolyte is an effective and simple method to improve the electrochemical performance of zinc anodes. In this paper, 2-mercaptosuccinic acid (MA) is introduced into the ZnSO4 electrolyte as an additive to improve the zinc anode performance. Electrochemical tests show that the addition of MA additive can reduce the charge transfer resistance of the interface, reduce the occurrence of side reactions such as hydrogen evolution and corrosion, reduce the nucleation overpotential, which is beneficial to the uniform nucleation of zinc, constrain the diffusion of zinc ions and accelerate the migration of zinc ions, which is beneficial to the uniform deposition of zinc and inhibits dendrite growth. Through XRD and SEM characterization, it was found that there was no obvious by-product generation on the surface of the zinc anode, and the zinc foil was protected. The Zn||Zn batteries containing MA additive electrolyte shows excellent long-term cycle performance. It can cycle stably for 1574 h under the conditions of 5 mA/cm2, 1 mAh/cm2, and has a large current density and area of 8 mA/cm2, 5 mAh/cm2. It can cycle stably for 546 hours even if the capacity is high. The polarization voltage during the cycle is low, showing excellent cycle stability. This shows that it is feasible to choose 2-mercaptosuccinic acid (MA) as an electrolyte additive to improve the stability of the zinc anode. |
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| Keywords:Zinc negative electrode; Electrolyte additive; 2-mercaptosuccinic acid; Zinc dendrite |
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