Dendrite growth and by-products in Zn metal aqueous batteries have impeded their development as promising energy storage devices.W eu tilize al ow-cost additive, glucose,t om odulate the typical ZnSO 4 electrolyte system for improving reversible plating/stripping on Zn anode for highperformance Zn ion batteries (ZIBs). Combing experimental characterizations and theoretical calculations,weshow that the glucose in ZnSO 4 aqueous environment can simultaneously modulate solvation structure of Zn 2+ and Zn anode-electrolyte interface.T he electrolyte engineering can alternate one H 2 O molecule from the primary Zn 2+ -6H 2 Os olvation shell and restraining side reactions due to the decomposition of active water.Concomitantly,glucose molecules are inclined to absorb on the surface of Zn anode,suppressing the random growth of Zn dendrite.A saproof of concept, as ymmetric cell and Zn-MnO 2 full cell with glucose electrolyte achieve boosted stability than that with pure ZnSO 4 electrolyte.

Dendrite growth and by‐products in Zn metal aqueous batteries have impeded their development as promising energy storage devices. We utilize a low‐cost additive, glucose, to modulate the typical ZnSO4 electrolyte system for improving reversible plating/stripping on Zn anode for high‐performance Zn ion batteries (ZIBs). Combing experimental characterizations and theoretical calculations, we show that the glucose in ZnSO4 aqueous environment can simultaneously modulate solvation structure of Zn2+ and Zn anode‐electrolyte interface. The electrolyte engineering can alternate one H2O molecule from the primary Zn2+‐6H2O solvation shell and restraining side reactions due to the decomposition of active water. Concomitantly, glucose molecules are inclined to absorb on the surface of Zn anode, suppressing the random growth of Zn dendrite. As a proof of concept, a symmetric cell and Zn‐MnO2 full cell with glucose electrolyte achieve boosted stability than that with pure ZnSO4 electrolyte.

WO3 nanoflower based negative electrodes demonstrate excellent balance between areal and gravimetric specific capacitances.