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 ZnSO 4 , Zn(OTF) 2 electrolyte can achieve better electrochemical performance due to the impact of larger CF 3 SO 3 - anions on the solvation shell structure of Zn 2+ . 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.