High-energy four-electron Br ⁻ /Br ⁰ /Br ⁺ redox aqueous zinc-bromine batteries enabled by complexation-chelation chemistry

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A complexation-chelation strategy stabilizes the four-electron redox for aqueous zinc–bromine batteries by complexing polybromides at the cathode and chelates Zn 2+ at the anode, endowing the cells with superior energy density and cycling durability.