A New Zinc Salt Chemistry for Aqueous Zinc-Metal Batteries

Aqueous zinc-ion batteries (ZIBs) are promising energy storage solutions with low cost and superior safety, but they suffer from chemical and electrochemical degradations closely related to the electrolyte. Here, a new zinc salt design and a drop-in solution for long cycle-life aqueous ZIBs are reported. The salt Zn(BBI)(2) with a rationally designed anion group, N-(benzenesulfonyl)benzenesulfonamide (BBI-), has a special amphiphilic molecular structure, which combines the benefits of hydrophilic and hydrophobic groups to properly tune the solubility and interfacial condition. This new zinc salt does not contain fluorine and is synthesized via a high-yield and low-cost method. It is shown that 1 m Zn(BBI)(2) aqueous electrolyte with a widened cathodic stability window effectively stabilizes Zn metal/H2O interface, mitigates chemical and electrochemical degradations, and enables both symmetric and full cells using a zinc-metal electrode.

Automated summary

A new zinc salt design and drop-in solution for long cycle-life aqueous zinc-ion batteries (ZIBs) are reported. The zinc salt, Zn(BBI)(2), with an amphiphilic molecular structure, can stabilize the Zn metal/H2O interface, mitigate chemical and electrochemical degradations, and enable both symmetric and full cells.