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Earth-abundant magnetite(Fe3O4)as cathode materials in aqueous zinc-ion batteries(ZIBs)is limited by its very low capacity and poor cycling.Here,a combined strategy based on carbon coating and electrolyte optimization is adopted to improve the performance of Fe3O4.The Zn-Fe3O4@C batteries display specific capacities of 93 mAh g-1 and 81％capacity retention after 200 cycles.Such performance is attributed to the enhanced electrical conductivity and structural stability of Fe3O4@C nanocomposites with suppressed iron dissolution.Experimental analysis reveals that the charge storage is contributed by diffusion-limited redox reactions and surface-controlled pseudocapacitance.A stretchable Zn-Fe3O4@C battery is further fabricated,showing stable performance when it is bent or stretched.Fe3O4 is a promising cathode mate-rial for cost-effective,safe,sustainable and wearable energy supplies.