The key role of concentrated Zn(OTF)2 electrolyte in the performance of aqueous Zn–S batteries

In this communication, the electrolyte chemistry in aqueous Zn-S batteries was illustrated systematically. Compared to Zn(AC)2 and ZnSO4, Zn(OTF)2 electrolyte can achieve better electrochemical performance due to the impact of larger CF3SO3- anions on the solvation shell structure of Zn2+. Moreover, a reversible capacity of 788 mA h g-1 in concentrated Zn(OTF)2 electrolyte (3 M) is obtained and shows higher retention due to higher Zn-nucleation overpotential and slower corrosion reactions.