Subtly manipulating Zn 2+ -coordinated configurations with a complexing agent to boost the reversibility of the zinc anode.

By using ethylenediamine (En) as a complexing agent, the impact of various Zn 2+ coordinated configurations on Zn anode reversibility was systematically studied. With the predominant configurations of [Zn(En)] 2+ and [Zn(En) 2 ] 2+ in the electrolyte, both symmetric Zn/Zn cells and Zn/NiHCF full cells exhibit significantly improved cycling stability compared to the counterparts with pure ZnSO 4 electrolyte.