Engineering Polymer Glue towards 90% Zinc Utilization for 1000 Hours to Make High?Performance Zn?Ion Batteries

Zinc (Zn) metal is considered the promising anode for “post-lithium” energy storage due to its high volumetric capacity, low redox potential, abundant reserve, and cost. However, extravagant Zn required in present batteries, featuring utilization rate device-scale energy/power densities far below theoretical values. The limited reversibility of attributed spontaneous parasitic reactions with aqueous electrolytes, that is, corrosion water, passive by-product formation, dendrite growth. Here, a new ion-selective polymer glue coated on designed, isolating from electrolyte by blocking water diffusion while allowing rapid Zn2+ ion migration facilitating uniform electrodeposition. Hence, record-high 90% realized 1000 h at current densities, sharp contrast much poorer cyclability (usually < 200 h) lower (50–85%) reported date. When matched vanadium-based cathode, resulting Zn-ion battery exhibited an ultrahigh density 228 Wh kg?1, comparable commercial lithium-ion batteries.