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A novel class of ternary hybrid aqueous electrolytes composed of betaine, nicotinamide, and zinc sulfate is designed to guarantee the reversible conversion of I/I0/I+ redox pairs for zinc–iodine (Zn–I2) batteries to achieve four-electron transfer. Benefiting from the synergistic effect of ternary electrolytes, the Zn–I2 battery exhibits a high specific capacity of 355.5 mA h g−1.

Graphical abstract: Ternary chloride-free electrolyte design for highly efficient aqueous zinc–iodine batteries with four-electron conversion

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