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

Abstract

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.