Ammonium enables reversible aqueous Zn battery chemistries by tailoring the interphase
As a continued effort to make Zn metal anode reversible at lower cost, researchers at ARL explored a new supporting salt based on ammonium salt to alter the interfacial structure and interphasial chemistries.
The salt was synthesized at ARL and much cheaper than the phosphonium salt used in the prior work.
Zn reversibility is significantly enhanced with HER suppressed, as evidenced by widened electrochemical stability window and improved Coulombic efficiency.
The interphase chemistry brought by this ammonium salt allows a Na2V6O16-1.63H2O/Zn cell with >1,000 cycle lifetime.
Modeling reveals a reaction pathway forming an interphase comprising ZnF2, ZnCO3, and fluoro-polymeric species.
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