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.