Boosting Cathode Activity and Anode Stability of Zn-S Batteries in Aqueous Media Through Cosolvent-Catalyst Synergy

Publication Name

Angewandte Chemie - International Edition


Aqueous Zn−S battery with high energy density represents a promising large-scale energy storage technology, but its application is severely hindered by the poor reversibility of both S cathode and Zn anode. Herein, we develop a “cocktail optimized” electrolyte containing tetraglyme (G4) and water as co-solvents and I2 as additive. The G4-I2 synergy could activate efficient polar I3−/I− catalyst couple and shield the cathode from water, thus facilitating the conversion kinetics of S and suppressing the interfacial side reactions. Simultaneously, it could stabilize Zn anode by forming an organic–inorganic interphase upon cycling. With boosted electrodes reversibility, the Zn−S cell delivers a high capacity of 775 mAh g−1 at 2 A g−1, and retains over 70 % capacity after 600 cycles at 4 A g−1. The advances can also be readily generalized to other ethers/water hybrid electrolytes, showing the universality of the “cocktail optimized” electrolyte design strategy.

Open Access Status

This publication is not available as open access

Funding Number


Funding Sponsor

National Natural Science Foundation of China



Link to publisher version (DOI)