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Metal-Organic Framework Additive in Electrolyte for Rechargeable Zinc-ion Battery


Rechargeable aqueous zinc batteries have attracted large attention due to their high safety and low cost. During the charging process, however, the cycling life is limited by dendrite because the desolvation process of hexaaqua zinc cation complex [Zn(H2O)6]2+ is incomplete and sluggish. Herein, two Zr-based metal-organic frameworks (MOFs) called UIO-66 and MOF-808 respectively, were used as additive into the electrolyte in order to improve the cycling life and accelerate the desolvation process. With the foundation of coin cell testing platform of Zn vs Zn battery, it can be clearly seen that the overpotential is decreased and the cycling life is prolonged. With the help of electrochemical impedance spectroscopy (EIS), it is proved that the desolvation process can be accelerated with the help of Zr-based MOFs additive.

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